Refactoring Core class structures ...

doc/AddonStorageBackend.md

@@ -188,7 +188,7 @@ namespace Friendica\Addon\samplestorage;
 
 use Friendica\Model\Storage\IWritableStorage;
 
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\L10n;
 
 class SampleStorageBackend implements IWritableStorage
@@ -249,12 +249,12 @@ namespace Friendica\Addon\samplestorage;
 
 use Friendica\Model\Storage\IStorageConfiguration;
 
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\L10n;
 
 class SampleStorageBackendConfig implements IStorageConfiguration
 {
-	/** @var IConfig */
+	/** @var \Friendica\Core\Config\Capability\IManageConfigValues */
 	private $config;
 	/** @var L10n */
 	private $l10n;
@@ -265,7 +265,7 @@ class SampleStorageBackendConfig implements IStorageConfiguration
 	  * You can add here every dynamic class as dependency you like and add them to a private field
 	  * Friendica automatically creates these classes and passes them as argument to the constructor									   
 	  */
-	public function __construct(IConfig $config, L10n $l10n) 
+	public function __construct(IManageConfigValues $config, L10n $l10n) 
 	{
 		$this->config = $config;
 		$this->l10n   = $l10n;

index.php

@@ -43,7 +43,7 @@ $a = \Friendica\DI::app();
 $a->runFrontend(
 	$dice->create(\Friendica\App\Module::class),
 	$dice->create(\Friendica\App\Router::class),
-	$dice->create(\Friendica\Core\PConfig\IPConfig::class),
+	$dice->create(\Friendica\Core\PConfig\Capability\IManagePersonalConfigValues::class),
 	$dice->create(\Friendica\Security\Authentication::class),
 	$dice->create(\Friendica\App\Page::class),
 	$start_time

src/App.php

@@ -25,12 +25,12 @@ use Exception;
 use Friendica\App\Arguments;
 use Friendica\App\BaseURL;
 use Friendica\App\Module;
-use Friendica\Core\Config\Factory\ConfigFactory;
+use Friendica\Core\Config\Factory\Config;
 use Friendica\Module\Maintenance;
 use Friendica\Security\Authentication;
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\Config\ValueObject\Cache;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
 use Friendica\Core\Theme;
@@ -88,7 +88,7 @@ class App
 	private $currentMobileTheme;
 
 	/**
-	 * @var IConfig The config
+	 * @var IManageConfigValues The config
 	 */
 	private $config;
 
@@ -123,7 +123,7 @@ class App
 	private $process;
 
 	/**
-	 * @var IPConfig
+	 * @var IManagePersonalConfigValues
 	 */
 	private $pConfig;
 
@@ -306,7 +306,7 @@ class App
 
 	/**
 	 * @param Database                                                       $database The Friendica Database
-	 * @param IConfig         $config   The Configuration
+	 * @param IManageConfigValues                                            $config   The Configuration
 	 * @param App\Mode                                                       $mode     The mode of this Friendica app
 	 * @param BaseURL                                                        $baseURL  The full base URL of this Friendica app
 	 * @param LoggerInterface                                                $logger   The current app logger
@@ -314,9 +314,9 @@ class App
 	 * @param L10n                                                           $l10n     The translator instance
 	 * @param App\Arguments                                                  $args     The Friendica Arguments of the call
 	 * @param Core\Process                                                   $process  The process methods
-	 * @param IPConfig        $pConfig  Personal configuration
+	 * @param \Friendica\Core\PConfig\Capability\IManagePersonalConfigValues $pConfig  Personal configuration
 	 */
-	public function __construct(Database $database, IConfig $config, App\Mode $mode, BaseURL $baseURL, LoggerInterface $logger, Profiler $profiler, L10n $l10n, Arguments $args, Core\Process $process, IPConfig $pConfig)
+	public function __construct(Database $database, IManageConfigValues $config, App\Mode $mode, BaseURL $baseURL, LoggerInterface $logger, Profiler $profiler, L10n $l10n, Arguments $args, Core\Process $process, IManagePersonalConfigValues $pConfig)
 	{
 		$this->database = $database;
 		$this->config   = $config;
@@ -357,7 +357,7 @@ class App
 			$this->profiler->update($this->config);
 
 			Core\Hook::loadHooks();
-			$loader = (new ConfigFactory())->createConfigFileLoader($this->getBasePath(), $_SERVER);
+			$loader = (new Config())->createConfigFileLoader($this->getBasePath(), $_SERVER);
 			Core\Hook::callAll('load_config', $loader);
 		}
 
@@ -554,14 +554,14 @@ class App
 	 *
 	 * @param App\Module                  $module The determined module
 	 * @param App\Router                  $router
-	 * @param IPConfig       $pconfig
+	 * @param IManagePersonalConfigValues $pconfig
 	 * @param Authentication              $auth The Authentication backend of the node
 	 * @param App\Page                    $page The Friendica page printing container
 	 *
 	 * @throws HTTPException\InternalServerErrorException
 	 * @throws \ImagickException
 	 */
-	public function runFrontend(App\Module $module, App\Router $router, IPConfig $pconfig, Authentication $auth, App\Page $page, float $start_time)
+	public function runFrontend(App\Module $module, App\Router $router, IManagePersonalConfigValues $pconfig, Authentication $auth, App\Page $page, float $start_time)
 	{
 		$this->profiler->set($start_time, 'start');
 		$this->profiler->set(microtime(true), 'classinit');

src/App/BaseURL.php

@@ -21,7 +21,7 @@
 
 namespace Friendica\App;
 
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\System;
 use Friendica\Util\Network;
 use Friendica\Util\Strings;
@@ -56,7 +56,7 @@ class BaseURL
 	/**
 	 * The Friendica Config
 	 *
-	 * @var IConfig
+	 * @var IManageConfigValues
 	 */
 	private $config;
 
@@ -272,10 +272,10 @@ class BaseURL
 	}
 
 	/**
-	 * @param IConfig $config The Friendica IConfiguration
+	 * @param \Friendica\Core\Config\Capability\IManageConfigValues $config The Friendica IConfiguration
 	 * @param array                                                 $server The $_SERVER array
 	 */
-	public function __construct(IConfig $config, array $server)
+	public function __construct(IManageConfigValues $config, array $server)
 	{
 		$this->config = $config;
 		$this->server = $server;

src/App/Mode.php

@@ -22,7 +22,7 @@
 namespace Friendica\App;
 
 use Detection\MobileDetect;
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Database\Database;
 use Friendica\Util\BasePath;
 

src/App/Module.php

@@ -170,13 +170,13 @@ class Module
 	 *
 	 * @param Arguments                                             $args   The Friendica execution arguments
 	 * @param Router                                                $router The Friendica routing instance
-	 * @param Core\Config\IConfig $config The Friendica Configuration
+	 * @param \Friendica\Core\Config\Capability\IManageConfigValues $config The Friendica Configuration
 	 *
 	 * @return Module The determined module of this call
 	 *
 	 * @throws \Exception
 	 */
-	public function determineClass(Arguments $args, Router $router, Core\Config\IConfig $config)
+	public function determineClass(Arguments $args, Router $router, Core\Config\Capability\IManageConfigValues $config)
 	{
 		$printNotAllowedAddon = false;
 

src/App/Page.php

@@ -26,8 +26,8 @@ use DOMDocument;
 use DOMXPath;
 use Friendica\App;
 use Friendica\Content\Nav;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Core\Renderer;
@@ -193,12 +193,12 @@ class Page implements ArrayAccess
 	 * @param App                                                            $app     The Friendica App instance
 	 * @param Module                                                         $module  The loaded Friendica module
 	 * @param L10n                                                           $l10n    The l10n language instance
-	 * @param IConfig  $config  The Friendica configuration
-	 * @param IPConfig $pConfig The Friendica personal configuration (for user)
+	 * @param \Friendica\Core\Config\Capability\IManageConfigValues          $config  The Friendica configuration
+	 * @param \Friendica\Core\PConfig\Capability\IManagePersonalConfigValues $pConfig The Friendica personal configuration (for user)
 	 *
 	 * @throws HTTPException\InternalServerErrorException
 	 */
-	private function initHead(App $app, Module $module, L10n $l10n, IConfig $config, IPConfig $pConfig)
+	private function initHead(App $app, Module $module, L10n $l10n, IManageConfigValues $config, IManagePersonalConfigValues $pConfig)
 	{
 		$interval = ((local_user()) ? $pConfig->get(local_user(), 'system', 'update_interval') : 40000);
 
@@ -372,12 +372,12 @@ class Page implements ArrayAccess
 	 * @param Mode                        $mode    The current node mode
 	 * @param Module                      $module  The loaded Friendica module
 	 * @param L10n                        $l10n    The l10n language class
-	 * @param IConfig  $config  The Configuration of this node
-	 * @param IPConfig $pconfig The personal/user configuration
+	 * @param IManageConfigValues         $config  The Configuration of this node
+	 * @param IManagePersonalConfigValues $pconfig The personal/user configuration
 	 *
 	 * @throws HTTPException\InternalServerErrorException
 	 */
-	public function run(App $app, BaseURL $baseURL, Mode $mode, Module $module, L10n $l10n, Profiler $profiler, IConfig $config, IPConfig $pconfig)
+	public function run(App $app, BaseURL $baseURL, Mode $mode, Module $module, L10n $l10n, Profiler $profiler, IManageConfigValues $config, IManagePersonalConfigValues $pconfig)
 	{
 		$moduleName = $module->getName();
 

src/App/Router.php

@@ -27,10 +27,10 @@ use FastRoute\Dispatcher;
 use FastRoute\RouteCollector;
 use FastRoute\RouteParser\Std;
 use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\ICache;
+use Friendica\Core\Cache\Capability\ICanCache;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
-use Friendica\Core\Lock\ILock;
+use Friendica\Core\Lock\Capability\ICanLock;
 use Friendica\Network\HTTPException;
 
 /**
@@ -77,10 +77,10 @@ class Router
 	/** @var L10n */
 	private $l10n;
 
-	/** @var ICache */
+	/** @var ICanCache */
 	private $cache;
 
-	/** @var ILock */
+	/** @var ICanLock */
 	private $lock;
 
 	/** @var string */
@@ -90,10 +90,10 @@ class Router
 	 * @param array               $server             The $_SERVER variable
 	 * @param string              $baseRoutesFilepath The path to a base routes file to leverage cache, can be empty
 	 * @param L10n                $l10n
-	 * @param ICache              $cache
+	 * @param ICanCache           $cache
 	 * @param RouteCollector|null $routeCollector
 	 */
-	public function __construct(array $server, string $baseRoutesFilepath, L10n $l10n, ICache $cache, ILock $lock, RouteCollector $routeCollector = null)
+	public function __construct(array $server, string $baseRoutesFilepath, L10n $l10n, ICanCache $cache, ICanLock $lock, RouteCollector $routeCollector = null)
 	{
 		$this->baseRoutesFilepath = $baseRoutesFilepath;
 		$this->l10n = $l10n;

src/Console/AutomaticInstallation.php

@@ -24,8 +24,8 @@ namespace Friendica\Console;
 use Asika\SimpleConsole\Console;
 use Friendica\App;
 use Friendica\App\BaseURL;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Core\Installer;
 use Friendica\Core\Theme;
 use Friendica\Database\Database;
@@ -36,9 +36,9 @@ class AutomaticInstallation extends Console
 {
 	/** @var App\Mode */
 	private $appMode;
-	/** @var \Friendica\Core\Config\Cache\Cache */
+	/** @var \Friendica\Core\Config\ValueObject\Cache */
 	private $configCache;
-	/** @var IConfig */
+	/** @var IManageConfigValues */
 	private $config;
 	/** @var Database */
 	private $dba;
@@ -98,7 +98,7 @@ Examples
 HELP;
 	}
 
-	public function __construct(App\Mode $appMode, Cache $configCache, IConfig $config, Database $dba, array $argv = null)
+	public function __construct(App\Mode $appMode, Cache $configCache, IManageConfigValues $config, Database $dba, array $argv = null)
 	{
 		parent::__construct($argv);
 
@@ -253,7 +253,7 @@ HELP;
 
 	/**
 	 * @param Installer                                $installer   The Installer instance
-	 * @param Cache     $configCache The config cache
+	 * @param \Friendica\Core\Config\ValueObject\Cache $configCache The config cache
 	 *
 	 * @return bool true if checks were successfully, otherwise false
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException

src/Console/Cache.php

@@ -24,7 +24,7 @@ namespace Friendica\Console;
 use Asika\SimpleConsole\CommandArgsException;
 use Friendica\App;
 use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\ICache;
+use Friendica\Core\Cache\Capability\ICanCache;
 use RuntimeException;
 
 /**
@@ -44,7 +44,7 @@ class Cache extends \Asika\SimpleConsole\Console
 	private $appMode;
 
 	/**
-	 * @var ICache
+	 * @var ICanCache
 	 */
 	private $cache;
 
@@ -82,7 +82,7 @@ HELP;
 		return $help;
 	}
 
-	public function __construct(App\Mode $appMode, ICache $cache, array $argv = null)
+	public function __construct(App\Mode $appMode, ICanCache $cache, array $argv = null)
 	{
 		parent::__construct($argv);
 

src/Console/Config.php

@@ -23,7 +23,7 @@ namespace Friendica\Console;
 
 use Asika\SimpleConsole\CommandArgsException;
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use RuntimeException;
 
 /**
@@ -56,7 +56,7 @@ class Config extends \Asika\SimpleConsole\Console
 	 */
 	private $appMode;
 	/**
-	 * @var IConfig
+	 * @var IManageConfigValues
 	 */
 	private $config;
 
@@ -94,7 +94,7 @@ HELP;
 		return $help;
 	}
 
-	public function __construct(App\Mode $appMode, IConfig $config, array $argv = null)
+	public function __construct(App\Mode $appMode, IManageConfigValues $config, array $argv = null)
 	{
 		parent::__construct($argv);
 

src/Console/DatabaseStructure.php

@@ -21,7 +21,7 @@
 
 namespace Friendica\Console;
 
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Core\Update;
 use Friendica\Database\Database;
 use Friendica\Database\DBStructure;

src/Console/Lock.php

@@ -23,7 +23,7 @@ namespace Friendica\Console;
 
 use Asika\SimpleConsole\CommandArgsException;
 use Friendica\App;
-use Friendica\Core\Lock\ILock;
+use Friendica\Core\Lock\Capability\ICanLock;
 use RuntimeException;
 
 /**
@@ -42,7 +42,7 @@ class Lock extends \Asika\SimpleConsole\Console
 	private $appMode;
 
 	/**
-	 * @var ILock
+	 * @var \Friendica\Core\Lock\Capability\ICanLock
 	 */
 	private $lock;
 
@@ -76,7 +76,7 @@ HELP;
 		return $help;
 	}
 
-	public function __construct(App\Mode $appMode, ILock $lock, array $argv = null)
+	public function __construct(App\Mode $appMode, ICanLock $lock, array $argv = null)
 	{
 		parent::__construct($argv);
 

src/Console/Maintenance.php

@@ -22,7 +22,7 @@
 namespace Friendica\Console;
 
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 
 /**
  * Sets maintenance mode for this node
@@ -36,7 +36,7 @@ class Maintenance extends \Asika\SimpleConsole\Console
 	 */
 	private $appMode;
 	/**
-	 * @var IConfig
+	 * @var IManageConfigValues
 	 */
 	private $config;
 
@@ -69,7 +69,7 @@ HELP;
 		return $help;
 	}
 
-	public function __construct(App\Mode $appMode, IConfig $config, $argv = null)
+	public function __construct(App\Mode $appMode, IManageConfigValues $config, $argv = null)
 	{
 		parent::__construct($argv);
 

src/Console/PostUpdate.php

@@ -22,7 +22,7 @@
 namespace Friendica\Console;
 
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\L10n;
 use Friendica\Core\Update;
 
@@ -38,7 +38,7 @@ class PostUpdate extends \Asika\SimpleConsole\Console
 	 */
 	private $appMode;
 	/**
-	 * @var IConfig
+	 * @var \Friendica\Core\Config\Capability\IManageConfigValues
 	 */
 	private $config;
 	/**
@@ -60,7 +60,7 @@ HELP;
 		return $help;
 	}
 
-	public function __construct(App\Mode $appMode, IConfig $config, L10n $l10n, array $argv = null)
+	public function __construct(App\Mode $appMode, IManageConfigValues $config, L10n $l10n, array $argv = null)
 	{
 		parent::__construct($argv);
 

src/Console/ServerBlock.php

@@ -24,7 +24,7 @@ namespace Friendica\Console;
 use Asika\SimpleConsole\CommandArgsException;
 use Asika\SimpleConsole\Console;
 use Console_Table;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 
 /**
  * Manage blocked servers
@@ -39,7 +39,7 @@ class ServerBlock extends Console
 	protected $helpOptions = ['h', 'help', '?'];
 
 	/**
-	 * @var IConfig
+	 * @var IManageConfigValues
 	 */
 	private $config;
 
@@ -72,7 +72,7 @@ HELP;
 		return $help;
 	}
 
-	public function __construct(IConfig $config, $argv = null)
+	public function __construct(IManageConfigValues $config, $argv = null)
 	{
 		parent::__construct($argv);
 
@@ -105,9 +105,9 @@ HELP;
 	 * Exports the list of blocked domains including the reason for the
 	 * block to a CSV file.
 	 *
-	 * @param IConfig $config
+	 * @param IManageConfigValues $config
 	 */
-	private function exportBlockedServers(IConfig $config)
+	private function exportBlockedServers(IManageConfigValues $config)
 	{
 		$filename = $this->getArgument(1);
 		$blocklist = $config->get('system', 'blocklist', []);
@@ -123,9 +123,9 @@ HELP;
 	 * Imports a list of domains and a reason for the block from a CSV
 	 * file, e.g. created with the export function.
 	 *
-	 * @param IConfig $config
+	 * @param IManageConfigValues $config
 	 */
-	private function importBlockedServers(IConfig $config)
+	private function importBlockedServers(IManageConfigValues $config)
 	{
 		$filename = $this->getArgument(1);
 		$currBlockList = $config->get('system', 'blocklist', []);
@@ -167,9 +167,9 @@ HELP;
 	/**
 	 * Prints the whole list of blocked domains including the reason
 	 *
-	 * @param IConfig $config
+	 * @param IManageConfigValues $config
 	 */
-	private function printBlockedServers(IConfig $config)
+	private function printBlockedServers(IManageConfigValues $config)
 	{
 		$table = new Console_Table();
 		$table->setHeaders(['Domain', 'Reason']);
@@ -183,11 +183,11 @@ HELP;
 	/**
 	 * Adds a server to the blocked list
 	 *
-	 * @param IConfig $config
+	 * @param IManageConfigValues $config
 	 *
 	 * @return int The return code (0 = success, 1 = failed)
 	 */
-	private function addBlockedServer(IConfig $config)
+	private function addBlockedServer(IManageConfigValues $config)
 	{
 		if (count($this->args) < 2 || count($this->args) > 3) {
 			throw new CommandArgsException('Add needs a domain and optional a reason.');
@@ -235,11 +235,11 @@ HELP;
 	/**
 	 * Removes a server from the blocked list
 	 *
-	 * @param IConfig $config
+	 * @param IManageConfigValues $config
 	 *
 	 * @return int The return code (0 = success, 1 = failed)
 	 */
-	private function removeBlockedServer(IConfig $config)
+	private function removeBlockedServer(IManageConfigValues $config)
 	{
 		if (count($this->args) !== 2) {
 			throw new CommandArgsException('Remove needs a second parameter.');

src/Console/Typo.php

@@ -21,7 +21,7 @@
 
 namespace Friendica\Console;
 
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 
 /**
  * Tired of chasing typos and finding them after a commit.
@@ -32,7 +32,7 @@ class Typo extends \Asika\SimpleConsole\Console
 	protected $helpOptions = ['h', 'help', '?'];
 
 	/**
-	 * @var IConfig
+	 * @var IManageConfigValues
 	 */
 	private $config;
 
@@ -53,7 +53,7 @@ HELP;
 		return $help;
 	}
 
-	public function __construct(IConfig $config, array $argv = null)
+	public function __construct(IManageConfigValues $config, array $argv = null)
 	{
 		parent::__construct($argv);
 

src/Console/User.php

@@ -25,7 +25,7 @@ use Console_Table;
 use Friendica\App;
 use Friendica\Content\Pager;
 use Friendica\Core\L10n;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Model\Register;
 use Friendica\Model\User as UserModel;
 use Friendica\Util\Temporal;
@@ -48,7 +48,7 @@ class User extends \Asika\SimpleConsole\Console
 	 */
 	private $l10n;
 	/**
-	 * @var IPConfig
+	 * @var IManagePersonalConfigValues
 	 */
 	private $pConfig;
 
@@ -88,7 +88,7 @@ HELP;
 		return $help;
 	}
 
-	public function __construct(App\Mode $appMode, L10n $l10n, IPConfig $pConfig, array $argv = null)
+	public function __construct(App\Mode $appMode, L10n $l10n, IManagePersonalConfigValues $pConfig, array $argv = null)
 	{
 		parent::__construct($argv);
 

src/Content/Conversation.php

@@ -26,10 +26,10 @@ use Friendica\App\Arguments;
 use Friendica\App\BaseURL;
 use Friendica\BaseModule;
 use Friendica\Core\ACL;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Core\Protocol;
 use Friendica\Core\Renderer;
 use Friendica\Core\Session;
@@ -66,11 +66,11 @@ class Conversation
 	private $item;
 	/** @var App\Arguments */
 	private $args;
-	/** @var IPConfig */
+	/** @var IManagePersonalConfigValues */
 	private $pConfig;
 	/** @var BaseURL */
 	private $baseURL;
-	/** @var IConfig */
+	/** @var IManageConfigValues */
 	private $config;
 	/** @var App */
 	private $app;
@@ -79,7 +79,7 @@ class Conversation
 	/** @var App\Mode */
 	private $mode;
 
-	public function __construct(LoggerInterface $logger, Profiler $profiler, Activity $activity, L10n $l10n, Item $item, Arguments $args, BaseURL $baseURL, IConfig $config, IPConfig $pConfig, App\Page $page, App\Mode $mode, App $app)
+	public function __construct(LoggerInterface $logger, Profiler $profiler, Activity $activity, L10n $l10n, Item $item, Arguments $args, BaseURL $baseURL, IManageConfigValues $config, IManagePersonalConfigValues $pConfig, App\Page $page, App\Mode $mode, App $app)
 	{
 		$this->activity = $activity;
 		$this->item     = $item;
@@ -629,7 +629,7 @@ class Conversation
 
 					$body_html = ItemModel::prepareBody($item, true, $preview);
 
-					list($categories, $folders) = $this->item->determineCategoriesTerms($item, local_user());
+					[$categories, $folders] = $this->item->determineCategoriesTerms($item, local_user());
 
 					if (!empty($item['content-warning']) && $this->pConfig->get(local_user(), 'system', 'disable_cw', false)) {
 						$title = ucfirst($item['content-warning']);

src/Core/Cache/Capability/ICanCache.php

@@ -19,23 +19,24 @@
  *
  */
 
-namespace Friendica\Core\Cache;
+namespace Friendica\Core\Cache\Capability;
 
 use Friendica\Core\Cache\Enum\Duration;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
 
 /**
- * Cache Interface
+ * Interface for caches
  */
-interface ICache
+interface ICanCache
 {
 	/**
 	 * Lists all cache keys
 	 *
-	 * @param string prefix optional a prefix to search
+	 * @param string|null prefix optional a prefix to search
 	 *
 	 * @return array Empty if it isn't supported by the cache driver
 	 */
-	public function getAllKeys($prefix = null);
+	public function getAllKeys(?string $prefix = null): array;
 
 	/**
 	 * Fetches cached data according to the key
@@ -43,8 +44,10 @@ interface ICache
 	 * @param string $key The key to the cached data
 	 *
 	 * @return mixed Cached $value or "null" if not found
+	 *
+	 * @throws CachePersistenceException In case the underlying cache driver has errors during persistence
 	 */
-	public function get($key);
+	public function get(string $key);
 
 	/**
 	 * Stores data in the cache identified by the key. The input $value can have multiple formats.
@@ -54,8 +57,10 @@ interface ICache
 	 * @param integer $ttl   The cache lifespan, must be one of the Cache constants
 	 *
 	 * @return bool
+	 *
+	 * @throws CachePersistenceException In case the underlying cache driver has errors during persistence
 	 */
-	public function set($key, $value, $ttl = Duration::FIVE_MINUTES);
+	public function set(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool;
 
 	/**
 	 * Delete a key from the cache
@@ -63,21 +68,26 @@ interface ICache
 	 * @param string $key The cache key
 	 *
 	 * @return bool
+	 *
+	 * @throws CachePersistenceException In case the underlying cache driver has errors during persistence
 	 */
-	public function delete($key);
+	public function delete(string $key): bool;
 
 	/**
 	 * Remove outdated data from the cache
+	 *
 	 * @param boolean $outdated just remove outdated values
 	 *
 	 * @return bool
+	 *
+	 * @throws CachePersistenceException In case the underlying cache driver has errors during persistence
 	 */
-	public function clear($outdated = true);
+	public function clear(bool $outdated = true): bool;
 
 	/**
 	 * Returns the name of the current cache
 	 *
 	 * @return string
 	 */
-	public function getName();
+	public function getName(): string;
 }

src/Core/Cache/Capability/ICanCacheInMemory.php

@@ -19,14 +19,15 @@
  *
  */
 
-namespace Friendica\Core\Cache;
+namespace Friendica\Core\Cache\Capability;
 
 use Friendica\Core\Cache\Enum\Duration;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
 
 /**
  * This interface defines methods for Memory-Caches only
  */
-interface IMemoryCache extends ICache
+interface ICanCacheInMemory extends ICanCache
 {
 	/**
 	 * Sets a value if it's not already stored
@@ -34,9 +35,12 @@ interface IMemoryCache extends ICache
 	 * @param string $key   The cache key
 	 * @param mixed  $value The old value we know from the cache
 	 * @param int    $ttl   The cache lifespan, must be one of the Cache constants
+	 *
 	 * @return bool
+	 *
+	 * @throws CachePersistenceException In case the underlying cache driver has errors during persistence
 	 */
-	public function add($key, $value, $ttl = Duration::FIVE_MINUTES);
+	public function add(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool;
 
 	/**
 	 * Compares if the old value is set and sets the new value
@@ -47,15 +51,20 @@ interface IMemoryCache extends ICache
 	 * @param int    $ttl      The cache lifespan, must be one of the Cache constants
 	 *
 	 * @return bool
+	 *
+	 * @throws CachePersistenceException In case the underlying cache driver has errors during persistence
 	 */
-	public function compareSet($key, $oldValue, $newValue, $ttl = Duration::FIVE_MINUTES);
+	public function compareSet(string $key, $oldValue, $newValue, int $ttl = Duration::FIVE_MINUTES): bool;
 
 	/**
 	 * Compares if the old value is set and removes it
 	 *
 	 * @param string $key   The cache key
 	 * @param mixed  $value The old value we know and want to delete
+	 *
 	 * @return bool
+	 *
+	 * @throws CachePersistenceException In case the underlying cache driver has errors during persistence
 	 */
-	public function compareDelete($key, $value);
+	public function compareDelete(string $key, $value): bool;
 }

src/Core/Cache/Exception/CachePersistenceException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Core\Cache\Exception;
+
+use Throwable;
+
+class CachePersistenceException extends \RuntimeException
+{
+	public function __construct($message = "", Throwable $previous = null)
+	{
+		parent::__construct($message, 500, $previous);
+	}
+}

src/Core/Cache/Exception/InvalidCacheDriverException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Core\Cache\Exception;
+
+use Throwable;
+
+class InvalidCacheDriverException extends \RuntimeException
+{
+	public function __construct($message = "", Throwable $previous = null)
+	{
+		parent::__construct($message, 500, $previous);
+	}
+}

src/Core/Cache/Factory/Cache.php

@@ -22,9 +22,12 @@
 namespace Friendica\Core\Cache\Factory;
 
 use Friendica\App\BaseURL;
-use Friendica\Core\Cache;
-use Friendica\Core\Cache\ICache;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Cache\Enum;
+use Friendica\Core\Cache\Capability\ICanCache;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
+use Friendica\Core\Cache\Exception\InvalidCacheDriverException;
+use Friendica\Core\Cache\Type;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Database\Database;
 use Friendica\Util\Profiler;
 use Psr\Log\LoggerInterface;
@@ -36,15 +39,15 @@ use Psr\Log\LoggerInterface;
  *
  * A basic class to generate a CacheDriver
  */
-class CacheFactory
+class Cache
 {
 	/**
 	 * @var string The default cache if nothing set
 	 */
-	const DEFAULT_TYPE = Cache\Enum\Type::DATABASE;
+	const DEFAULT_TYPE = Enum\Type::DATABASE;
 
 	/**
-	 * @var IConfig The IConfiguration to read parameters out of the config
+	 * @var IManageConfigValues The IConfiguration to read parameters out of the config
 	 */
 	private $config;
 
@@ -68,7 +71,7 @@ class CacheFactory
 	 */
 	private $logger;
 
-	public function __construct(BaseURL $baseURL, IConfig $config, Database $dba, Profiler $profiler, LoggerInterface $logger)
+	public function __construct(BaseURL $baseURL, IManageConfigValues $config, Database $dba, Profiler $profiler, LoggerInterface $logger)
 	{
 		$this->hostname = $baseURL->getHostname();
 		$this->config   = $config;
@@ -80,39 +83,41 @@ class CacheFactory
 	/**
 	 * This method creates a CacheDriver for the given cache driver name
 	 *
-	 * @param string $type The cache type to create (default is per config)
+	 * @param string|null $type The cache type to create (default is per config)
 	 *
-	 * @return ICache  The instance of the CacheDriver
-	 * @throws \Exception    The exception if something went wrong during the CacheDriver creation
+	 * @return ICanCache  The instance of the CacheDriver
+	 *
+	 * @throws InvalidCacheDriverException In case the underlying cache driver isn't valid or not configured properly
+	 * @throws CachePersistenceException In case the underlying cache has errors during persistence
 	 */
-	public function create(string $type = null)
+	public function create(string $type = null): ICanCache
 	{
 		if (empty($type)) {
 			$type = $this->config->get('system', 'cache_driver', self::DEFAULT_TYPE);
 		}
 
 		switch ($type) {
-			case Cache\Enum\Type::MEMCACHE:
-				$cache = new Cache\Type\MemcacheCache($this->hostname, $this->config);
+			case Enum\Type::MEMCACHE:
+				$cache = new Type\MemcacheCache($this->hostname, $this->config);
 				break;
-			case Cache\Enum\Type::MEMCACHED:
-				$cache = new Cache\Type\MemcachedCache($this->hostname, $this->config, $this->logger);
+			case Enum\Type::MEMCACHED:
+				$cache = new Type\MemcachedCache($this->hostname, $this->config, $this->logger);
 				break;
-			case Cache\Enum\Type::REDIS:
-				$cache = new Cache\Type\RedisCache($this->hostname, $this->config);
+			case Enum\Type::REDIS:
+				$cache = new Type\RedisCache($this->hostname, $this->config);
 				break;
-			case Cache\Enum\Type::APCU:
-				$cache = new Cache\Type\APCuCache($this->hostname);
+			case Enum\Type::APCU:
+				$cache = new Type\APCuCache($this->hostname);
 				break;
 			default:
-				$cache = new Cache\Type\DatabaseCache($this->hostname, $this->dba);
+				$cache = new Type\DatabaseCache($this->hostname, $this->dba);
 		}
 
 		$profiling = $this->config->get('system', 'profiling', false);
 
 		// In case profiling is enabled, wrap the ProfilerCache around the current cache
 		if (isset($profiling) && $profiling !== false) {
-			return new Cache\Type\ProfilerCache($cache, $this->profiler);
+			return new Type\ProfilerCacheDecorator($cache, $this->profiler);
 		} else {
 			return $cache;
 		}

src/Core/Cache/Type/APCuCache.php

@@ -21,28 +21,28 @@
 
 namespace Friendica\Core\Cache\Type;
 
-use Exception;
 use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\IMemoryCache;
-use Friendica\Core\Cache\Type\TraitCompareDelete;
-use Friendica\Core\Cache\Type\TraitCompareSet;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
 use Friendica\Core\Cache\Enum\Type;
+use Friendica\Core\Cache\Exception\InvalidCacheDriverException;
 
 /**
  * APCu Cache.
  */
-class APCuCache extends BaseCache implements IMemoryCache
+class APCuCache extends AbstractCache implements ICanCacheInMemory
 {
-	use TraitCompareSet;
-	use TraitCompareDelete;
+	use CompareSetTrait;
+	use CompareDeleteTrait;
 
 	/**
-	 * @throws Exception
+	 * @param string $hostname
+	 *
+	 * @throws InvalidCacheDriverException
 	 */
 	public function __construct(string $hostname)
 	{
 		if (!self::isAvailable()) {
-			throw new Exception('APCu is not available.');
+			throw new InvalidCacheDriverException('APCu is not available.');
 		}
 
 		parent::__construct($hostname);
@@ -51,9 +51,9 @@ class APCuCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function getAllKeys($prefix = null)
+	public function getAllKeys(?string $prefix = null): array
 	{
-		$ns = $this->getCacheKey($prefix);
+		$ns = $this->getCacheKey($prefix ?? '');
 		$ns = preg_quote($ns, '/');
 
 		if (class_exists('\APCIterator')) {
@@ -73,12 +73,11 @@ class APCuCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function get($key)
+	public function get(string $key)
 	{
-		$return = null;
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
-		$cached = apcu_fetch($cachekey, $success);
+		$cached = apcu_fetch($cacheKey, $success);
 		if (!$success) {
 			return null;
 		}
@@ -89,30 +88,30 @@ class APCuCache extends BaseCache implements IMemoryCache
 		// We also check if the db entry is a serialized
 		// boolean 'false' value (which we want to return).
 		if ($cached === serialize(false) || $value !== false) {
-			$return = $value;
+			return $value;
 		}
 
-		return $return;
+		return null;
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function set($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function set(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
 		$cached = serialize($value);
 
 		if ($ttl > 0) {
 			return apcu_store(
-				$cachekey,
+				$cacheKey,
 				$cached,
 				$ttl
 			);
 		} else {
 			return apcu_store(
-				$cachekey,
+				$cacheKey,
 				$cached
 			);
 		}
@@ -121,16 +120,16 @@ class APCuCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function delete($key)
+	public function delete(string $key): bool
 	{
-		$cachekey = $this->getCacheKey($key);
-		return apcu_delete($cachekey);
+		$cacheKey = $this->getCacheKey($key);
+		return apcu_delete($cacheKey);
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function clear($outdated = true)
+	public function clear(bool $outdated = true): bool
 	{
 		if ($outdated) {
 			return true;
@@ -151,15 +150,15 @@ class APCuCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function add($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function add(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 		$cached   = serialize($value);
 
-		return apcu_add($cachekey, $cached);
+		return apcu_add($cacheKey, $cached);
 	}
 
-	public static function isAvailable()
+	public static function isAvailable(): bool
 	{
 		if (!extension_loaded('apcu')) {
 			return false;
@@ -178,7 +177,7 @@ class APCuCache extends BaseCache implements IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
 		return Type::APCU;
 	}

src/Core/Cache/Type/AbstractCache.php

@@ -21,12 +21,12 @@
 
 namespace Friendica\Core\Cache\Type;
 
-use Friendica\Core\Cache\ICache;
+use Friendica\Core\Cache\Capability\ICanCache;
 
 /**
  * Abstract class for common used functions
  */
-abstract class BaseCache implements ICache
+abstract class AbstractCache implements ICanCache
 {
 	/**
 	 * @var string The hostname
@@ -42,9 +42,8 @@ abstract class BaseCache implements ICache
 	 * Returns the prefix (to avoid namespace conflicts)
 	 *
 	 * @return string
-	 * @throws \Exception
 	 */
-	protected function getPrefix()
+	protected function getPrefix(): string
 	{
 		// We fetch with the hostname as key to avoid problems with other applications
 		return $this->hostName;
@@ -52,19 +51,20 @@ abstract class BaseCache implements ICache
 
 	/**
 	 * @param string $key The original key
+	 *
 	 * @return string        The cache key used for the cache
-	 * @throws \Exception
 	 */
-	protected function getCacheKey($key)
+	protected function getCacheKey(string $key): string
 	{
 		return $this->getPrefix() . ":" . $key;
 	}
 
 	/**
-	 * @param array $keys   A list of cached keys
-	 * @return array        A list of original keys
+	 * @param string[] $keys A list of cached keys
+	 *
+	 * @return string[] A list of original keys
 	 */
-	protected function getOriginalKeys($keys)
+	protected function getOriginalKeys(array $keys): array
 	{
 		if (empty($keys)) {
 			return [];
@@ -84,12 +84,12 @@ abstract class BaseCache implements ICache
 	 * Filters the keys of an array with a given prefix
 	 * Returns the filtered keys as an new array
 	 *
-	 * @param array $keys The keys, which should get filtered
+	 * @param string[]    $keys   The keys, which should get filtered
 	 * @param string|null $prefix The prefix (if null, all keys will get returned)
 	 *
-	 * @return array The filtered array with just the keys
+	 * @return string[] The filtered array with just the keys
 	 */
-	protected function filterArrayKeysByPrefix(array $keys, string $prefix = null)
+	protected function filterArrayKeysByPrefix(array $keys, string $prefix = null): array
 	{
 		if (empty($prefix)) {
 			return $keys;

src/Core/Cache/Type/ArrayCache.php

@@ -21,25 +21,23 @@
 
 namespace Friendica\Core\Cache\Type;
 
-use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\IMemoryCache;
-use Friendica\Core\Cache\Type\TraitCompareDelete;
-use Friendica\Core\Cache\Enum\Type;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
+use Friendica\Core\Cache\Enum;
 
 /**
  * Implementation of the IMemoryCache mainly for testing purpose
  */
-class ArrayCache extends BaseCache implements IMemoryCache
+class ArrayCache extends AbstractCache implements ICanCacheInMemory
 {
-	use TraitCompareDelete;
+	use CompareDeleteTrait;
 
 	/** @var array Array with the cached data */
-	protected $cachedData = array();
+	protected $cachedData = [];
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function getAllKeys($prefix = null)
+	public function getAllKeys(?string $prefix = null): array
 	{
 		return $this->filterArrayKeysByPrefix(array_keys($this->cachedData), $prefix);
 	}
@@ -47,7 +45,7 @@ class ArrayCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function get($key)
+	public function get(string $key)
 	{
 		if (isset($this->cachedData[$key])) {
 			return $this->cachedData[$key];
@@ -58,7 +56,7 @@ class ArrayCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function set($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function set(string $key, $value, int $ttl = Enum\Duration::FIVE_MINUTES): bool
 	{
 		$this->cachedData[$key] = $value;
 		return true;
@@ -67,7 +65,7 @@ class ArrayCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function delete($key)
+	public function delete(string $key): bool
 	{
 		unset($this->cachedData[$key]);
 		return true;
@@ -76,7 +74,7 @@ class ArrayCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function clear($outdated = true)
+	public function clear(bool $outdated = true): bool
 	{
 		// Array doesn't support TTL so just don't delete something
 		if ($outdated) {
@@ -90,7 +88,7 @@ class ArrayCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function add($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function add(string $key, $value, int $ttl = Enum\Duration::FIVE_MINUTES): bool
 	{
 		if (isset($this->cachedData[$key])) {
 			return false;
@@ -102,7 +100,7 @@ class ArrayCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function compareSet($key, $oldValue, $newValue, $ttl = Duration::FIVE_MINUTES)
+	public function compareSet(string $key, $oldValue, $newValue, int $ttl = Enum\Duration::FIVE_MINUTES): bool
 	{
 		if ($this->get($key) === $oldValue) {
 			return $this->set($key, $newValue);
@@ -114,8 +112,8 @@ class ArrayCache extends BaseCache implements IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
-		return Type::ARRAY;
+		return Enum\Type::ARRAY;
 	}
 }

src/Core/Cache/Type/CompareDeleteTrait.php

@@ -24,28 +24,28 @@ namespace Friendica\Core\Cache\Type;
 use Friendica\Core\Cache\Enum\Duration;
 
 /**
- * Trait TraitCompareSetDelete
- *
- * This Trait is to compensate non native "exclusive" sets/deletes in caches
+ * This Trait is to compensate nonnative "exclusive" sets/deletes in caches
  */
-trait TraitCompareDelete
+trait CompareDeleteTrait
 {
-	abstract public function get($key);
+	abstract public function get(string $key);
 
-	abstract public function set($key, $value, $ttl = Duration::FIVE_MINUTES);
+	abstract public function set(string $key, $value, int $ttl = Duration::FIVE_MINUTES);
 
-	abstract public function delete($key);
+	abstract public function delete(string $key);
 
-	abstract public function add($key, $value, $ttl = Duration::FIVE_MINUTES);
+	abstract public function add(string $key, $value, int $ttl = Duration::FIVE_MINUTES);
 
 	/**
 	 * NonNative - Compares if the old value is set and removes it
 	 *
 	 * @param string $key   The cache key
 	 * @param mixed  $value The old value we know and want to delete
+	 *
 	 * @return bool
 	 */
-	public function compareDelete($key, $value) {
+	public function compareDelete(string $key, $value): bool
+	{
 		if ($this->add($key . "_lock", true)) {
 			if ($this->get($key) === $value) {
 				$this->delete($key);

src/Core/Cache/Type/CompareSetTrait.php

@@ -24,19 +24,17 @@ namespace Friendica\Core\Cache\Type;
 use Friendica\Core\Cache\Enum\Duration;
 
 /**
- * Trait TraitCompareSetDelete
- *
- * This Trait is to compensate non native "exclusive" sets/deletes in caches
+ * This Trait is to compensate nonnative "exclusive" sets/deletes in caches
  */
-trait TraitCompareSet
+trait CompareSetTrait
 {
-	abstract public function get($key);
+	abstract public function get(string $key);
 
-	abstract public function set($key, $value, $ttl = Duration::FIVE_MINUTES);
+	abstract public function set(string $key, $value, int $ttl = Duration::FIVE_MINUTES);
 
-	abstract public function delete($key);
+	abstract public function delete(string $key);
 
-	abstract public function add($key, $value, $ttl = Duration::FIVE_MINUTES);
+	abstract public function add(string $key, $value, int $ttl = Duration::FIVE_MINUTES);
 
 	/**
 	 * NonNative - Compares if the old value is set and sets the new value
@@ -48,7 +46,8 @@ trait TraitCompareSet
 	 *
 	 * @return bool
 	 */
-	public function compareSet($key, $oldValue, $newValue, $ttl = Duration::FIVE_MINUTES) {
+	public function compareSet(string $key, $oldValue, $newValue, int $ttl = Duration::FIVE_MINUTES): bool
+	{
 		if ($this->add($key . "_lock", true)) {
 			if ($this->get($key) === $oldValue) {
 				$this->set($key, $newValue, $ttl);

src/Core/Cache/Type/DatabaseCache.php

@@ -21,16 +21,16 @@
 
 namespace Friendica\Core\Cache\Type;
 
-use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\ICache;
-use Friendica\Core\Cache\Enum\Type;
+use Friendica\Core\Cache\Capability\ICanCache;
+use Friendica\Core\Cache\Enum;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
 use Friendica\Database\Database;
 use Friendica\Util\DateTimeFormat;
 
 /**
  * Database Cache
  */
-class DatabaseCache extends BaseCache implements ICache
+class DatabaseCache extends AbstractCache implements ICanCache
 {
 	/**
 	 * @var Database
@@ -46,9 +46,12 @@ class DatabaseCache extends BaseCache implements ICache
 
 	/**
 	 * (@inheritdoc)
+	 *
+	 * @throws CachePersistenceException
 	 */
-	public function getAllKeys($prefix = null)
+	public function getAllKeys(?string $prefix = null): array
 	{
+		try {
 			if (empty($prefix)) {
 				$where = ['`expires` >= ?', DateTimeFormat::utcNow()];
 			} else {
@@ -61,7 +64,11 @@ class DatabaseCache extends BaseCache implements ICache
 			while ($key = $this->dba->fetch($stmt)) {
 				array_push($keys, $key['k']);
 			}
+		} catch (\Exception $exception) {
+			throw new CachePersistenceException(sprintf('Cannot fetch all keys with prefix %s', $prefix), $exception);
+		} finally {
 			$this->dba->close($stmt);
+		}
 
 		return $keys;
 	}
@@ -69,9 +76,12 @@ class DatabaseCache extends BaseCache implements ICache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function get($key)
+	public function get(string $key)
 	{
-		$cache = $this->dba->selectFirst('cache', ['v'], ['`k` = ? AND (`expires` >= ? OR `expires` = -1)', $key, DateTimeFormat::utcNow()]);
+		try {
+			$cache = $this->dba->selectFirst('cache', ['v'], [
+				'`k` = ? AND (`expires` >= ? OR `expires` = -1)', $key, DateTimeFormat::utcNow()
+			]);
 
 			if ($this->dba->isResult($cache)) {
 				$cached = $cache['v'];
@@ -84,6 +94,9 @@ class DatabaseCache extends BaseCache implements ICache
 					return $value;
 				}
 			}
+		} catch (\Exception $exception) {
+			throw new CachePersistenceException(sprintf('Cannot get cache entry with key %s', $key), $exception);
+		}
 
 		return null;
 	}
@@ -91,8 +104,9 @@ class DatabaseCache extends BaseCache implements ICache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function set($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function set(string $key, $value, int $ttl = Enum\Duration::FIVE_MINUTES): bool
 	{
+		try {
 			if ($ttl > 0) {
 				$fields = [
 					'v'       => serialize($value),
@@ -108,33 +122,44 @@ class DatabaseCache extends BaseCache implements ICache
 			}
 
 			return $this->dba->update('cache', $fields, ['k' => $key], true);
+		} catch (\Exception $exception) {
+			throw new CachePersistenceException(sprintf('Cannot set cache entry with key %s', $key), $exception);
+		}
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function delete($key)
+	public function delete(string $key): bool
 	{
+		try {
 			return $this->dba->delete('cache', ['k' => $key]);
+		} catch (\Exception $exception) {
+			throw new CachePersistenceException(sprintf('Cannot delete cache entry with key %s', $key), $exception);
+		}
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function clear($outdated = true)
+	public function clear(bool $outdated = true): bool
 	{
+		try {
 			if ($outdated) {
 				return $this->dba->delete('cache', ['`expires` < NOW()']);
 			} else {
 				return $this->dba->delete('cache', ['`k` IS NOT NULL ']);
 			}
+		} catch (\Exception $exception) {
+			throw new CachePersistenceException('Cannot clear cache', $exception);
+		}
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
-		return Type::DATABASE;
+		return Enum\Type::DATABASE;
 	}
 }

src/Core/Cache/Type/MemcacheCache.php

@@ -21,24 +21,22 @@
 
 namespace Friendica\Core\Cache\Type;
 
-use Exception;
 use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\IMemoryCache;
-use Friendica\Core\Cache\Type\TraitCompareDelete;
-use Friendica\Core\Cache\Type\TraitCompareSet;
-use Friendica\Core\Cache\Type\TraitMemcacheCommand;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
 use Friendica\Core\Cache\Enum\Type;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
+use Friendica\Core\Cache\Exception\InvalidCacheDriverException;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Memcache;
 
 /**
  * Memcache Cache
  */
-class MemcacheCache extends BaseCache implements IMemoryCache
+class MemcacheCache extends AbstractCache implements ICanCacheInMemory
 {
-	use TraitCompareSet;
-	use TraitCompareDelete;
-	use TraitMemcacheCommand;
+	use CompareSetTrait;
+	use CompareDeleteTrait;
+	use MemcacheCommandTrait;
 
 	/**
 	 * @var Memcache
@@ -46,30 +44,34 @@ class MemcacheCache extends BaseCache implements IMemoryCache
 	private $memcache;
 
 	/**
-	 * @throws Exception
+	 * @param string              $hostname
+	 * @param IManageConfigValues $config
+	 *
+	 * @throws InvalidCacheDriverException
+	 * @throws CachePersistenceException
 	 */
-	public function __construct(string $hostname, IConfig $config)
+	public function __construct(string $hostname, IManageConfigValues $config)
 	{
 		if (!class_exists('Memcache', false)) {
-			throw new Exception('Memcache class isn\'t available');
+			throw new InvalidCacheDriverException('Memcache class isn\'t available');
 		}
 
 		parent::__construct($hostname);
 
 		$this->memcache = new Memcache();
 
-		$this->server = $config->get('system', 'memcache_host');;
+		$this->server = $config->get('system', 'memcache_host');
 		$this->port   = $config->get('system', 'memcache_port');
 
 		if (!@$this->memcache->connect($this->server, $this->port)) {
-			throw new Exception('Expected Memcache server at ' . $this->server . ':' . $this->port . ' isn\'t available');
+			throw new CachePersistenceException('Expected Memcache server at ' . $this->server . ':' . $this->port . ' isn\'t available');
 		}
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function getAllKeys($prefix = null)
+	public function getAllKeys(?string $prefix = null): array
 	{
 		$keys = $this->getOriginalKeys($this->getMemcacheKeys());
 
@@ -79,17 +81,16 @@ class MemcacheCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function get($key)
+	public function get(string $key)
 	{
-		$return   = null;
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
 		// We fetch with the hostname as key to avoid problems with other applications
-		$cached = $this->memcache->get($cachekey);
+		$cached = $this->memcache->get($cacheKey);
 
 		// @see http://php.net/manual/en/memcache.get.php#84275
 		if (is_bool($cached) || is_double($cached) || is_long($cached)) {
-			return $return;
+			return null;
 		}
 
 		$value = @unserialize($cached);
@@ -98,30 +99,30 @@ class MemcacheCache extends BaseCache implements IMemoryCache
 		// We also check if the db entry is a serialized
 		// boolean 'false' value (which we want to return).
 		if ($cached === serialize(false) || $value !== false) {
-			$return = $value;
+			return $value;
 		}
 
-		return $return;
+		return null;
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function set($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function set(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
 		// We store with the hostname as key to avoid problems with other applications
 		if ($ttl > 0) {
 			return $this->memcache->set(
-				$cachekey,
+				$cacheKey,
 				serialize($value),
 				MEMCACHE_COMPRESSED,
 				time() + $ttl
 			);
 		} else {
 			return $this->memcache->set(
-				$cachekey,
+				$cacheKey,
 				serialize($value),
 				MEMCACHE_COMPRESSED
 			);
@@ -131,16 +132,16 @@ class MemcacheCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function delete($key)
+	public function delete(string $key): bool
 	{
-		$cachekey = $this->getCacheKey($key);
-		return $this->memcache->delete($cachekey);
+		$cacheKey = $this->getCacheKey($key);
+		return $this->memcache->delete($cacheKey);
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function clear($outdated = true)
+	public function clear(bool $outdated = true): bool
 	{
 		if ($outdated) {
 			return true;
@@ -152,16 +153,16 @@ class MemcacheCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function add($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function add(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
-		return $this->memcache->add($cachekey, serialize($value), MEMCACHE_COMPRESSED, $ttl);
+		$cacheKey = $this->getCacheKey($key);
+		return $this->memcache->add($cacheKey, serialize($value), MEMCACHE_COMPRESSED, $ttl);
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
 		return Type::MEMCACHE;
 	}

src/Core/Cache/Type/MemcacheCommandTrait.php

@@ -21,7 +21,7 @@
 
 namespace Friendica\Core\Cache\Type;
 
-use Friendica\Network\HTTPException\InternalServerErrorException;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
 
 /**
  * Trait for Memcache to add a custom version of the
@@ -29,7 +29,7 @@ use Friendica\Network\HTTPException\InternalServerErrorException;
  *
  * Adds the possibility to directly communicate with the memcache too
  */
-trait TraitMemcacheCommand
+trait MemcacheCommandTrait
 {
 	/**
 	 * @var string server address
@@ -52,22 +52,18 @@ trait TraitMemcacheCommand
 	 *
 	 * @return array All keys of the memcache instance
 	 *
-	 * @throws InternalServerErrorException
+	 * @throws CachePersistenceException
 	 */
-	protected function getMemcacheKeys()
+	protected function getMemcacheKeys(): array
 	{
 		$string = $this->sendMemcacheCommand("stats items");
 		$lines  = explode("\r\n", $string);
-		$slabs  = [];
 		$keys   = [];
 
 		foreach ($lines as $line) {
-
 			if (preg_match("/STAT items:([\d]+):number ([\d]+)/", $line, $matches) &&
 				isset($matches[1]) &&
 				!in_array($matches[1], $keys)) {
-
-				$slabs[] = $matches[1];
 				$string = $this->sendMemcacheCommand("stats cachedump " . $matches[1] . " " . $matches[2]);
 				preg_match_all("/ITEM (.*?) /", $string, $matches);
 				$keys = array_merge($keys, $matches[1]);
@@ -88,20 +84,19 @@ trait TraitMemcacheCommand
 	 *
 	 * @return string The returned buffer result
 	 *
-	 * @throws InternalServerErrorException In case the memcache server isn't available (anymore)
+	 * @throws CachePersistenceException In case the memcache server isn't available (anymore)
 	 */
-	protected function sendMemcacheCommand(string $command)
+	protected function sendMemcacheCommand(string $command): string
 	{
 		$s = @fsockopen($this->server, $this->port);
 		if (!$s) {
-			throw new InternalServerErrorException("Cant connect to:" . $this->server . ':' . $this->port);
+			throw new CachePersistenceException("Cant connect to:" . $this->server . ':' . $this->port);
 		}
 
 		fwrite($s, $command . "\r\n");
 		$buf = '';
 
 		while (!feof($s)) {
-
 			$buf .= fgets($s, 256);
 
 			if (strpos($buf, "END\r\n") !== false) { // stat says end

src/Core/Cache/Type/MemcachedCache.php

@@ -21,25 +21,23 @@
 
 namespace Friendica\Core\Cache\Type;
 
-use Exception;
 use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\IMemoryCache;
-use Friendica\Core\Cache\Type\TraitCompareDelete;
-use Friendica\Core\Cache\Type\TraitCompareSet;
-use Friendica\Core\Cache\Type\TraitMemcacheCommand;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
 use Friendica\Core\Cache\Enum\Type;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
+use Friendica\Core\Cache\Exception\InvalidCacheDriverException;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Memcached;
 use Psr\Log\LoggerInterface;
 
 /**
  * Memcached Cache
  */
-class MemcachedCache extends BaseCache implements IMemoryCache
+class MemcachedCache extends AbstractCache implements ICanCacheInMemory
 {
-	use TraitCompareSet;
-	use TraitCompareDelete;
-	use TraitMemcacheCommand;
+	use CompareSetTrait;
+	use CompareDeleteTrait;
+	use MemcacheCommandTrait;
 
 	/**
 	 * @var \Memcached
@@ -58,14 +56,17 @@ class MemcachedCache extends BaseCache implements IMemoryCache
 	 *   1 => ...
 	 * }
 	 *
-	 * @param array $memcached_hosts
+	 * @param string              $hostname
+	 * @param IManageConfigValues $config
+	 * @param LoggerInterface     $logger
 	 *
-	 * @throws \Exception
+	 * @throws InvalidCacheDriverException
+	 * @throws CachePersistenceException
 	 */
-	public function __construct(string $hostname, IConfig $config, LoggerInterface $logger)
+	public function __construct(string $hostname, IManageConfigValues $config, LoggerInterface $logger)
 	{
 		if (!class_exists('Memcached', false)) {
-			throw new Exception('Memcached class isn\'t available');
+			throw new InvalidCacheDriverException('Memcached class isn\'t available');
 		}
 
 		parent::__construct($hostname);
@@ -88,14 +89,14 @@ class MemcachedCache extends BaseCache implements IMemoryCache
 		$this->memcached->addServers($memcached_hosts);
 
 		if (count($this->memcached->getServerList()) == 0) {
-			throw new Exception('Expected Memcached servers aren\'t available, config:' . var_export($memcached_hosts, true));
+			throw new CachePersistenceException('Expected Memcached servers aren\'t available, config:' . var_export($memcached_hosts, true));
 		}
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function getAllKeys($prefix = null)
+	public function getAllKeys(?string $prefix = null): array
 	{
 		$keys = $this->getOriginalKeys($this->getMemcacheKeys());
 
@@ -105,40 +106,40 @@ class MemcachedCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function get($key)
+	public function get(string $key)
 	{
-		$return   = null;
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
 		// We fetch with the hostname as key to avoid problems with other applications
-		$value = $this->memcached->get($cachekey);
+		$value = $this->memcached->get($cacheKey);
 
 		if ($this->memcached->getResultCode() === Memcached::RES_SUCCESS) {
-			$return = $value;
+			return $value;
+		} elseif ($this->memcached->getResultCode() === Memcached::RES_NOTFOUND) {
+			$this->logger->notice('Try to use unknown key.', ['key' => $key]);
+			return null;
 		} else {
-			$this->logger->debug('Memcached \'get\' failed', ['result' => $this->memcached->getResultMessage()]);
+			throw new CachePersistenceException(sprintf('Cannot get cache entry with key %s', $key), new \MemcachedException($this->memcached->getResultMessage(), $this->memcached->getResultCode()));
 		}
-
-		return $return;
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function set($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function set(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
 		// We store with the hostname as key to avoid problems with other applications
 		if ($ttl > 0) {
 			return $this->memcached->set(
-				$cachekey,
+				$cacheKey,
 				$value,
 				$ttl
 			);
 		} else {
 			return $this->memcached->set(
-				$cachekey,
+				$cacheKey,
 				$value
 			);
 		}
@@ -147,16 +148,16 @@ class MemcachedCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function delete($key)
+	public function delete(string $key): bool
 	{
-		$cachekey = $this->getCacheKey($key);
-		return $this->memcached->delete($cachekey);
+		$cacheKey = $this->getCacheKey($key);
+		return $this->memcached->delete($cacheKey);
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function clear($outdated = true)
+	public function clear(bool $outdated = true): bool
 	{
 		if ($outdated) {
 			return true;
@@ -168,16 +169,16 @@ class MemcachedCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function add($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function add(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
-		return $this->memcached->add($cachekey, $value, $ttl);
+		$cacheKey = $this->getCacheKey($key);
+		return $this->memcached->add($cacheKey, $value, $ttl);
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
 		return Type::MEMCACHED;
 	}

src/Core/Cache/Type/ProfilerCacheDecorator.php

@@ -22,19 +22,19 @@
 namespace Friendica\Core\Cache\Type;
 
 use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\ICache;
-use Friendica\Core\Cache\IMemoryCache;
+use Friendica\Core\Cache\Capability\ICanCache;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
 use Friendica\Util\Profiler;
 
 /**
- * This class wraps cache driver so they can get profiled - in case the profiler is enabled
+ * This class wraps cache driver, so they can get profiled - in case the profiler is enabled
  *
- * It is using the decorator pattern (@see
+ * It is using the decorator pattern (@see https://en.wikipedia.org/wiki/Decorator_pattern )
  */
-class ProfilerCache implements ICache, IMemoryCache
+class ProfilerCacheDecorator implements ICanCache, ICanCacheInMemory
 {
 	/**
-	 * @var ICache The original cache driver
+	 * @var ICanCache The original cache driver
 	 */
 	private $cache;
 
@@ -43,7 +43,7 @@ class ProfilerCache implements ICache, IMemoryCache
 	 */
 	private $profiler;
 
-	public function __construct(ICache $cache, Profiler $profiler)
+	public function __construct(ICanCache $cache, Profiler $profiler)
 	{
 		$this->cache    = $cache;
 		$this->profiler = $profiler;
@@ -52,7 +52,7 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getAllKeys($prefix = null)
+	public function getAllKeys(?string $prefix = null): array
 	{
 		$this->profiler->startRecording('cache');
 
@@ -66,7 +66,7 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function get($key)
+	public function get(string $key)
 	{
 		$this->profiler->startRecording('cache');
 
@@ -80,7 +80,7 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function set($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function set(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
 		$this->profiler->startRecording('cache');
 
@@ -94,7 +94,7 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function delete($key)
+	public function delete(string $key): bool
 	{
 		$this->profiler->startRecording('cache');
 
@@ -108,7 +108,7 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function clear($outdated = true)
+	public function clear(bool $outdated = true): bool
 	{
 		$this->profiler->startRecording('cache');
 
@@ -122,9 +122,9 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function add($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function add(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		if ($this->cache instanceof IMemoryCache) {
+		if ($this->cache instanceof ICanCacheInMemory) {
 			$this->profiler->startRecording('cache');
 
 			$return = $this->cache->add($key, $value, $ttl);
@@ -140,9 +140,9 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function compareSet($key, $oldValue, $newValue, $ttl = Duration::FIVE_MINUTES)
+	public function compareSet(string $key, $oldValue, $newValue, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		if ($this->cache instanceof IMemoryCache) {
+		if ($this->cache instanceof ICanCacheInMemory) {
 			$this->profiler->startRecording('cache');
 
 			$return = $this->cache->compareSet($key, $oldValue, $newValue, $ttl);
@@ -158,9 +158,9 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function compareDelete($key, $value)
+	public function compareDelete(string $key, $value): bool
 	{
-		if ($this->cache instanceof IMemoryCache) {
+		if ($this->cache instanceof ICanCacheInMemory) {
 			$this->profiler->startRecording('cache');
 
 			$return = $this->cache->compareDelete($key, $value);
@@ -176,7 +176,7 @@ class ProfilerCache implements ICache, IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function GetName()
+	public function GetName(): string
 	{
 		return $this->cache->getName() . ' (with profiler)';
 	}

src/Core/Cache/Type/RedisCache.php

@@ -23,15 +23,17 @@ namespace Friendica\Core\Cache\Type;
 
 use Exception;
 use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\IMemoryCache;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
 use Friendica\Core\Cache\Enum\Type;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
+use Friendica\Core\Cache\Exception\InvalidCacheDriverException;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Redis;
 
 /**
  * Redis Cache. This driver is based on Memcache driver
  */
-class RedisCache extends BaseCache implements IMemoryCache
+class RedisCache extends AbstractCache implements ICanCacheInMemory
 {
 	/**
 	 * @var Redis
@@ -39,12 +41,13 @@ class RedisCache extends BaseCache implements IMemoryCache
 	private $redis;
 
 	/**
-	 * @throws Exception
+	 * @throws InvalidCacheDriverException
+	 * @throws CachePersistenceException
 	 */
-	public function __construct(string $hostname, IConfig $config)
+	public function __construct(string $hostname, IManageConfigValues $config)
 	{
 		if (!class_exists('Redis', false)) {
-			throw new Exception('Redis class isn\'t available');
+			throw new InvalidCacheDriverException('Redis class isn\'t available');
 		}
 
 		parent::__construct($hostname);
@@ -57,24 +60,24 @@ class RedisCache extends BaseCache implements IMemoryCache
 		$redis_db   = $config->get('system', 'redis_db', 0);
 
 		if (isset($redis_port) && !@$this->redis->connect($redis_host, $redis_port)) {
-			throw new Exception('Expected Redis server at ' . $redis_host . ':' . $redis_port . ' isn\'t available');
+			throw new CachePersistenceException('Expected Redis server at ' . $redis_host . ':' . $redis_port . ' isn\'t available');
 		} elseif (!@$this->redis->connect($redis_host)) {
-			throw new Exception('Expected Redis server at ' . $redis_host . ' isn\'t available');
+			throw new CachePersistenceException('Expected Redis server at ' . $redis_host . ' isn\'t available');
 		}
 
 		if (isset($redis_pw) && !$this->redis->auth($redis_pw)) {
-			throw new Exception('Cannot authenticate redis server at ' . $redis_host . ':' . $redis_port);
+			throw new CachePersistenceException('Cannot authenticate redis server at ' . $redis_host . ':' . $redis_port);
 		}
 
 		if ($redis_db !== 0 && !$this->redis->select($redis_db)) {
-			throw new Exception('Cannot switch to redis db ' . $redis_db . ' at ' . $redis_host . ':' . $redis_port);
+			throw new CachePersistenceException('Cannot switch to redis db ' . $redis_db . ' at ' . $redis_host . ':' . $redis_port);
 		}
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function getAllKeys($prefix = null)
+	public function getAllKeys(?string $prefix = null): array
 	{
 		if (empty($prefix)) {
 			$search = '*';
@@ -90,13 +93,13 @@ class RedisCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function get($key)
+	public function get(string $key)
 	{
 		$return   = null;
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
-		$cached = $this->redis->get($cachekey);
-		if ($cached === false && !$this->redis->exists($cachekey)) {
+		$cached = $this->redis->get($cacheKey);
+		if ($cached === false && !$this->redis->exists($cacheKey)) {
 			return null;
 		}
 
@@ -115,21 +118,21 @@ class RedisCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function set($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function set(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
 		$cached = serialize($value);
 
 		if ($ttl > 0) {
 			return $this->redis->setex(
-				$cachekey,
+				$cacheKey,
 				$ttl,
 				$cached
 			);
 		} else {
 			return $this->redis->set(
-				$cachekey,
+				$cacheKey,
 				$cached
 			);
 		}
@@ -138,10 +141,10 @@ class RedisCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function delete($key)
+	public function delete(string $key): bool
 	{
-		$cachekey = $this->getCacheKey($key);
-		$this->redis->del($cachekey);
+		$cacheKey = $this->getCacheKey($key);
+		$this->redis->del($cacheKey);
 		// Redis doesn't have an error state for del()
 		return true;
 	}
@@ -149,7 +152,7 @@ class RedisCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function clear($outdated = true)
+	public function clear(bool $outdated = true): bool
 	{
 		if ($outdated) {
 			return true;
@@ -161,34 +164,30 @@ class RedisCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function add($key, $value, $ttl = Duration::FIVE_MINUTES)
+	public function add(string $key, $value, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 		$cached   = serialize($value);
 
-		return $this->redis->setnx($cachekey, $cached);
+		return $this->redis->setnx($cacheKey, $cached);
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function compareSet($key, $oldValue, $newValue, $ttl = Duration::FIVE_MINUTES)
+	public function compareSet(string $key, $oldValue, $newValue, int $ttl = Duration::FIVE_MINUTES): bool
 	{
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
 		$newCached = serialize($newValue);
 
-		$this->redis->watch($cachekey);
+		$this->redis->watch($cacheKey);
 		// If the old value isn't what we expected, somebody else changed the key meanwhile
 		if ($this->get($key) === $oldValue) {
 			if ($ttl > 0) {
-				$result = $this->redis->multi()
-					->setex($cachekey, $ttl, $newCached)
-					->exec();
+				$result = $this->redis->multi()->setex($cacheKey, $ttl, $newCached)->exec();
 			} else {
-				$result = $this->redis->multi()
-					->set($cachekey, $newCached)
-					->exec();
+				$result = $this->redis->multi()->set($cacheKey, $newCached)->exec();
 			}
 			return $result !== false;
 		}
@@ -199,17 +198,15 @@ class RedisCache extends BaseCache implements IMemoryCache
 	/**
 	 * (@inheritdoc)
 	 */
-	public function compareDelete($key, $value)
+	public function compareDelete(string $key, $value): bool
 	{
-		$cachekey = $this->getCacheKey($key);
+		$cacheKey = $this->getCacheKey($key);
 
-		$this->redis->watch($cachekey);
+		$this->redis->watch($cacheKey);
 		// If the old value isn't what we expected, somebody else changed the key meanwhile
 		if ($this->get($key) === $value) {
-			$result = $this->redis->multi()
-				->del($cachekey)
-				->exec();
-			return $result !== false;
+			$this->redis->multi()->del($cacheKey)->exec();
+			return true;
 		}
 		$this->redis->unwatch();
 		return false;
@@ -218,7 +215,7 @@ class RedisCache extends BaseCache implements IMemoryCache
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
 		return Type::REDIS;
 	}

src/Core/Config/Capability/IManageConfigValues.php

@@ -19,32 +19,35 @@
  *
  */
 
-namespace Friendica\Core\Config;
+namespace Friendica\Core\Config\Capability;
 
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\Exception\ConfigPersistenceException;
+use Friendica\Core\Config\ValueObject\Cache;
 
 /**
- * Interface for accessing system wide configurations
+ * Interface for accessing system-wide configurations
  */
-interface IConfig
+interface IManageConfigValues
 {
-
 	/**
 	 * Loads all configuration values of family into a cached storage.
 	 *
-	 * All configuration values of the system are stored in the cache ( @param string $cat The category of the configuration value
+	 * All configuration values of the system are stored in the cache.
+	 *
+	 * @param string $cat The category of the configuration value
 	 *
 	 * @return void
+	 *
+	 * @throws ConfigPersistenceException In case the persistence layer throws errors
 	 */
-	function load(string $cat = 'config');
+	public function load(string $cat = 'config');
 
 	/**
 	 * Get a particular user's config variable given the category name
 	 * ($cat) and a $key.
 	 *
 	 * Get a particular config value from the given category ($cat)
-	 * and the $key from a cached storage either from the $this->configAdapter
-	 * (@see IConfigAdapter) or from the $this->configCache (@see ConfigCache).
+	 * and the $key from a cached storage either from the database or from the cache.
 	 *
 	 * @param string  $cat        The category of the configuration value
 	 * @param string  $key           The configuration key to query
@@ -52,8 +55,11 @@ interface IConfig
 	 * @param boolean $refresh       optional, If true the config is loaded from the db and not from the cache (default: false)
 	 *
 	 * @return mixed Stored value or null if it does not exist
+	 *
+	 * @throws ConfigPersistenceException In case the persistence layer throws errors
+	 *
 	 */
-	function get(string $cat, string $key, $default_value = null, bool $refresh = false);
+	public function get(string $cat, string $key, $default_value = null, bool $refresh = false);
 
 	/**
 	 * Sets a configuration value for system config
@@ -67,26 +73,30 @@ interface IConfig
 	 * @param mixed  $value  The value to store
 	 *
 	 * @return bool Operation success
+	 *
+	 * @throws ConfigPersistenceException In case the persistence layer throws errors
 	 */
-	function set(string $cat, string $key, $value);
+	public function set(string $cat, string $key, $value): bool;
 
 	/**
 	 * Deletes the given key from the system configuration.
 	 *
-	 * Removes the configured value from the stored cache in $this->configCache
-	 * (@see ConfigCache) and removes it from the database (@see IConfigAdapter).
+	 * Removes the configured value from the stored cache in the cache and removes it from the database.
 	 *
 	 * @param string $cat The category of the configuration value
 	 * @param string $key    The configuration key to delete
 	 *
 	 * @return bool
+	 *
+	 * @throws ConfigPersistenceException In case the persistence layer throws errors
+	 *
 	 */
-	function delete(string $cat, string $key);
+	public function delete(string $cat, string $key): bool;
 
 	/**
 	 * Returns the Config Cache
 	 *
 	 * @return Cache
 	 */
-	function getCache();
+	public function getCache(): Cache;
 }

src/Core/Config/Exception/ConfigFileException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Core\Config\Exception;
+
+use Throwable;
+
+class ConfigFileException extends \RuntimeException
+{
+	public function __construct($message = "", $code = 0, Throwable $previous = null)
+	{
+		parent::__construct($message, 500, $previous);
+	}
+}

src/Core/Config/Exception/ConfigPersistenceException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Core\Config\Exception;
+
+use Throwable;
+
+class ConfigPersistenceException extends \RuntimeException
+{
+	public function __construct($message = "", Throwable $previous = null)
+	{
+		parent::__construct($message, 500, $previous);
+	}
+}

src/Core/Config/Factory/Config.php

@@ -21,13 +21,13 @@
 
 namespace Friendica\Core\Config\Factory;
 
-use Exception;
-use Friendica\Core\Config;
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\Config\Model\Config as ConfigModel;
-use Friendica\Core\Config\Cache\ConfigFileLoader;
+use Friendica\Core\Config\Capability;
+use Friendica\Core\Config\Repository;
+use Friendica\Core\Config\Type;
+use Friendica\Core\Config\Util;
+use Friendica\Core\Config\ValueObject\Cache;
 
-class ConfigFactory
+class Config
 {
 	/**
 	 * The key of the $_SERVER variable to override the config directory
@@ -52,11 +52,11 @@ class ConfigFactory
 
 	/**
 	 * @param string $basePath The basepath of FRIENDICA
-	 * @param array $serer the $_SERVER array
+	 * @param array  $server   The $_SERVER array
 	 *
-	 * @return \Friendica\Core\Config\Cache\ConfigFileLoader
+	 * @return Util\ConfigFileLoader
 	 */
-	public function createConfigFileLoader(string $basePath, array $server = [])
+	public function createConfigFileLoader(string $basePath, array $server = []): Util\ConfigFileLoader
 	{
 		if (!empty($server[self::CONFIG_DIR_ENV]) && is_dir($server[self::CONFIG_DIR_ENV])) {
 			$configDir = $server[self::CONFIG_DIR_ENV];
@@ -65,17 +65,16 @@ class ConfigFactory
 		}
 		$staticDir = $basePath . DIRECTORY_SEPARATOR . self::STATIC_DIR;
 
-		return new ConfigFileLoader($basePath, $configDir, $staticDir);
+		return new Util\ConfigFileLoader($basePath, $configDir, $staticDir);
 	}
 
 	/**
-	 * @param \Friendica\Core\Config\Cache\ConfigFileLoader $loader The Config Cache loader (INI/config/.htconfig)
+	 * @param Util\ConfigFileLoader $loader The Config Cache loader (INI/config/.htconfig)
+	 * @param array                 $server
 	 *
 	 * @return Cache
-	 *
-	 * @throws Exception
 	 */
-	public function createCache(ConfigFileLoader $loader, array $server = [])
+	public function createCache(Util\ConfigFileLoader $loader, array $server = []): Cache
 	{
 		$configCache = new Cache();
 		$loader->setupCache($configCache, $server);
@@ -84,20 +83,19 @@ class ConfigFactory
 	}
 
 	/**
-	 * @param \Friendica\Core\Config\Cache\Cache $configCache The config cache of this adapter
-	 * @param ConfigModel                        $configModel The configuration model
+	 * @param Cache $configCache The config cache of this adapter
+	 * @param Repository\Config $configRepo  The configuration repository
 	 *
-	 * @return Config\IConfig
+	 * @return Capability\IManageConfigValues
 	 */
-	public function create(Cache $configCache, ConfigModel $configModel)
+	public function create(Cache $configCache, Repository\Config $configRepo)
 	{
 		if ($configCache->get('system', 'config_adapter') === 'preload') {
-			$configuration = new Config\Type\PreloadConfig($configCache, $configModel);
+			$configuration = new Type\PreloadConfig($configCache, $configRepo);
 		} else {
-			$configuration = new Config\Type\JitConfig($configCache, $configModel);
+			$configuration = new Type\JitConfig($configCache, $configRepo);
 		}
 
-
 		return $configuration;
 	}
 }

src/Core/Config/Repository/Config.php

@@ -19,34 +19,35 @@
  *
  */
 
-namespace Friendica\Core\Config\Model;
+namespace Friendica\Core\Config\Repository;
 
+use Friendica\Core\Config\Exception\ConfigPersistenceException;
+use Friendica\Core\Config\Util\ValueConversion;
 use Friendica\Database\Database;
 
 /**
- * The Config model backend, which is using the general DB-model backend for configs
+ * The Config Repository, which is using the general DB-model backend for configs
  */
 class Config
 {
 	/** @var Database */
-	protected $dba;
+	protected $db;
 
-	/**
-	 * @param Database $dba The database connection of this model
-	 */
-	public function __construct(Database $dba)
+	public function __construct(Database $db)
 	{
-		$this->dba = $dba;
+		$this->db = $db;
 	}
 
+	protected static $table_name = 'config';
+
 	/**
 	 * Checks if the model is currently connected
 	 *
 	 * @return bool
 	 */
-	public function isConnected()
+	public function isConnected(): bool
 	{
-		return $this->dba->isConnected();
+		return $this->db->isConnected();
 	}
 
 	/**
@@ -56,29 +57,33 @@ class Config
 	 *
 	 * @return array The config array
 	 *
-	 * @throws \Exception In case DB calls are invalid
+	 * @throws ConfigPersistenceException In case the persistence layer throws errors
 	 */
-	public function load(string $cat = null)
+	public function load(?string $cat = null): array
 	{
 		$return = [];
 
+		try {
 			if (empty($cat)) {
-			$configs = $this->dba->select('config', ['cat', 'v', 'k']);
+				$configs = $this->db->select(static::$table_name, ['cat', 'v', 'k']);
 			} else {
-			$configs = $this->dba->select('config', ['cat', 'v', 'k'], ['cat' => $cat]);
+				$configs = $this->db->select(static::$table_name, ['cat', 'v', 'k'], ['cat' => $cat]);
 			}
 
-		while ($config = $this->dba->fetch($configs)) {
-
+			while ($config = $this->db->fetch($configs)) {
 				$key   = $config['k'];
-			$value = DbaUtils::toConfigValue($config['v']);
+				$value = ValueConversion::toConfigValue($config['v']);
 
 				// just save it in case it is set
 				if (isset($value)) {
 					$return[$config['cat']][$key] = $value;
 				}
 			}
-		$this->dba->close($configs);
+		} catch (\Exception $exception) {
+			throw new ConfigPersistenceException(sprintf('Cannot load config category %s', $cat), $exception);
+		} finally {
+			$this->db->close($configs);
+		}
 
 		return $return;
 	}
@@ -94,7 +99,7 @@ class Config
 	 *
 	 * @return array|string|null Stored value or null if it does not exist
 	 *
-	 * @throws \Exception In case DB calls are invalid
+	 * @throws ConfigPersistenceException In case the persistence layer throws errors
 	 */
 	public function get(string $cat, string $key)
 	{
@@ -102,15 +107,19 @@ class Config
 			return null;
 		}
 
-		$config = $this->dba->selectFirst('config', ['v'], ['cat' => $cat, 'k' => $key]);
-		if ($this->dba->isResult($config)) {
-			$value = DbaUtils::toConfigValue($config['v']);
+		try {
+			$config = $this->db->selectFirst(static::$table_name, ['v'], ['cat' => $cat, 'k' => $key]);
+			if ($this->db->isResult($config)) {
+				$value = ValueConversion::toConfigValue($config['v']);
 
 				// just return it in case it is set
 				if (isset($value)) {
 					return $value;
 				}
 			}
+		} catch (\Exception $exception) {
+			throw new ConfigPersistenceException(sprintf('Cannot get config with category %s and key %s', $cat, $key), $exception);
+		}
 
 		return null;
 	}
@@ -126,9 +135,9 @@ class Config
 	 *
 	 * @return bool Operation success
 	 *
-	 * @throws \Exception In case DB calls are invalid
+	 * @throws ConfigPersistenceException In case the persistence layer throws errors
 	 */
-	public function set(string $cat, string $key, $value)
+	public function set(string $cat, string $key, $value): bool
 	{
 		if (!$this->isConnected()) {
 			return false;
@@ -144,11 +153,13 @@ class Config
 			return true;
 		}
 
-		$dbvalue = DbaUtils::toDbValue($value);
+		$dbValue = ValueConversion::toDbValue($value);
 
-		$result = $this->dba->update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $key], true);
-
-		return $result;
+		try {
+			return $this->db->update(static::$table_name, ['v' => $dbValue], ['cat' => $cat, 'k' => $key], true);
+		} catch (\Exception $exception) {
+			throw new ConfigPersistenceException(sprintf('Cannot set config with category %s and key %s', $cat, $key), $exception);
+		}
 	}
 
 	/**
@@ -159,14 +170,18 @@ class Config
 	 *
 	 * @return bool Operation success
 	 *
-	 * @throws \Exception In case DB calls are invalid
+	 * @throws ConfigPersistenceException In case the persistence layer throws errors
 	 */
-	public function delete(string $cat, string $key)
+	public function delete(string $cat, string $key): bool
 	{
 		if (!$this->isConnected()) {
 			return false;
 		}
 
-		return $this->dba->delete('config', ['cat' => $cat, 'k' => $key]);
+		try {
+			return $this->db->delete(static::$table_name, ['cat' => $cat, 'k' => $key]);
+		} catch (\Exception $exception) {
+			throw new ConfigPersistenceException(sprintf('Cannot delete config with category %s and key %s', $cat, $key), $exception);
+		}
 	}
 }

src/Core/Config/Type/AbstractConfig.php

@@ -21,17 +21,17 @@
 
 namespace Friendica\Core\Config\Type;
 
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\Config\IConfig;
-use Friendica\Model;
+use Friendica\Core\Config\Repository\Config;
+use Friendica\Core\Config\ValueObject\Cache;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 
 /**
  * This class is responsible for all system-wide configuration values in Friendica
  * There are two types of storage
- * - The Config-Files    (loaded into the FileCache @see ConfigCache)
- * - The Config-DB-Table (per Config-DB-model @see Model\Config\Config)
+ * - The Config-Files    (loaded into the FileCache @see Cache)
+ * - The Config-Repository (per Config-Repository @see Config )
  */
-abstract class BaseConfig implements IConfig
+abstract class AbstractConfig implements IManageConfigValues
 {
 	/**
 	 * @var Cache
@@ -39,24 +39,24 @@ abstract class BaseConfig implements IConfig
 	protected $configCache;
 
 	/**
-	 * @var \Friendica\Core\Config\Model\Config
+	 * @var Config
 	 */
-	protected $configModel;
+	protected $configRepo;
 
 	/**
 	 * @param Cache  $configCache The configuration cache (based on the config-files)
-	 * @param \Friendica\Core\Config\Model\Config $configModel The configuration model
+	 * @param Config $configRepo  The configuration repository
 	 */
-	public function __construct(Cache $configCache, \Friendica\Core\Config\Model\Config $configModel)
+	public function __construct(Cache $configCache, Config $configRepo)
 	{
 		$this->configCache = $configCache;
-		$this->configModel = $configModel;
+		$this->configRepo  = $configRepo;
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getCache()
+	public function getCache(): Cache
 	{
 		return $this->configCache;
 	}

src/Core/Config/Type/JitConfig.php

@@ -21,8 +21,8 @@
 
 namespace Friendica\Core\Config\Type;
 
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\Config\Model\Config;
+use Friendica\Core\Config\ValueObject\Cache;
+use Friendica\Core\Config\Repository\Config;
 
 /**
  * This class implements the Just-In-Time configuration, which will cache
@@ -31,7 +31,7 @@ use Friendica\Core\Config\Model\Config;
  * Default Configuration type.
  * Provides the best performance for pages loading few configuration variables.
  */
-class JitConfig extends BaseConfig
+class JitConfig extends AbstractConfig
 {
 	/**
 	 * @var array Array of already loaded db values (even if there was no value)
@@ -40,11 +40,11 @@ class JitConfig extends BaseConfig
 
 	/**
 	 * @param Cache  $configCache The configuration cache (based on the config-files)
-	 * @param Config $configModel The configuration model
+	 * @param Config $configRepo  The configuration model
 	 */
-	public function __construct(Cache $configCache, Config $configModel)
+	public function __construct(Cache $configCache, Config $configRepo)
 	{
-		parent::__construct($configCache, $configModel);
+		parent::__construct($configCache, $configRepo);
 		$this->db_loaded = [];
 
 		$this->load();
@@ -52,16 +52,15 @@ class JitConfig extends BaseConfig
 
 	/**
 	 * {@inheritDoc}
-	 *
 	 */
 	public function load(string $cat = 'config')
 	{
 		// If not connected, do nothing
-		if (!$this->configModel->isConnected()) {
+		if (!$this->configRepo->isConnected()) {
 			return;
 		}
 
-		$config = $this->configModel->load($cat);
+		$config = $this->configRepo->load($cat);
 
 		if (!empty($config[$cat])) {
 			foreach ($config[$cat] as $key => $value) {
@@ -79,15 +78,14 @@ class JitConfig extends BaseConfig
 	public function get(string $cat, string $key, $default_value = null, bool $refresh = false)
 	{
 		// if the value isn't loaded or refresh is needed, load it to the cache
-		if ($this->configModel->isConnected() &&
+		if ($this->configRepo->isConnected() &&
 			(empty($this->db_loaded[$cat][$key]) ||
 			 $refresh)) {
+			$dbValue = $this->configRepo->get($cat, $key);
 
-			$dbvalue = $this->configModel->get($cat, $key);
-
-			if (isset($dbvalue)) {
-				$this->configCache->set($cat, $key, $dbvalue, Cache::SOURCE_DB);
-				unset($dbvalue);
+			if (isset($dbValue)) {
+				$this->configCache->set($cat, $key, $dbValue, Cache::SOURCE_DB);
+				unset($dbValue);
 			}
 
 			$this->db_loaded[$cat][$key] = true;
@@ -102,17 +100,17 @@ class JitConfig extends BaseConfig
 	/**
 	 * {@inheritDoc}
 	 */
-	public function set(string $cat, string $key, $value)
+	public function set(string $cat, string $key, $value): bool
 	{
 		// set the cache first
 		$cached = $this->configCache->set($cat, $key, $value, Cache::SOURCE_DB);
 
 		// If there is no connected adapter, we're finished
-		if (!$this->configModel->isConnected()) {
+		if (!$this->configRepo->isConnected()) {
 			return $cached;
 		}
 
-		$stored = $this->configModel->set($cat, $key, $value);
+		$stored = $this->configRepo->set($cat, $key, $value);
 
 		$this->db_loaded[$cat][$key] = $stored;
 
@@ -122,7 +120,7 @@ class JitConfig extends BaseConfig
 	/**
 	 * {@inheritDoc}
 	 */
-	public function delete(string $cat, string $key)
+	public function delete(string $cat, string $key): bool
 	{
 		$cacheRemoved = $this->configCache->delete($cat, $key);
 
@@ -130,11 +128,11 @@ class JitConfig extends BaseConfig
 			unset($this->db_loaded[$cat][$key]);
 		}
 
-		if (!$this->configModel->isConnected()) {
+		if (!$this->configRepo->isConnected()) {
 			return $cacheRemoved;
 		}
 
-		$storeRemoved = $this->configModel->delete($cat, $key);
+		$storeRemoved = $this->configRepo->delete($cat, $key);
 
 		return $cacheRemoved || $storeRemoved;
 	}

src/Core/Config/Type/PreloadConfig.php

@@ -21,8 +21,8 @@
 
 namespace Friendica\Core\Config\Type;
 
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\Config\Model\Config;
+use Friendica\Core\Config\ValueObject\Cache;
+use Friendica\Core\Config\Repository\Config;
 
 /**
  * This class implements the preload configuration, which will cache
@@ -30,18 +30,18 @@ use Friendica\Core\Config\Model\Config;
  *
  * Minimizes the number of database queries to retrieve configuration values at the cost of memory.
  */
-class PreloadConfig extends BaseConfig
+class PreloadConfig extends AbstractConfig
 {
 	/** @var bool */
 	private $config_loaded;
 
 	/**
 	 * @param Cache  $configCache The configuration cache (based on the config-files)
-	 * @param Config $configModel The configuration model
+	 * @param Config $configRepo  The configuration model
 	 */
-	public function __construct(Cache $configCache, Config $configModel)
+	public function __construct(Cache $configCache, Config $configRepo)
 	{
-		parent::__construct($configCache, $configModel);
+		parent::__construct($configCache, $configRepo);
 		$this->config_loaded = false;
 
 		$this->load();
@@ -51,7 +51,6 @@ class PreloadConfig extends BaseConfig
 	 * {@inheritDoc}
 	 *
 	 * This loads all config values everytime load is called
-	 *
 	 */
 	public function load(string $cat = 'config')
 	{
@@ -61,11 +60,11 @@ class PreloadConfig extends BaseConfig
 		}
 
 		// If not connected, do nothing
-		if (!$this->configModel->isConnected()) {
+		if (!$this->configRepo->isConnected()) {
 			return;
 		}
 
-		$config              = $this->configModel->load();
+		$config              = $this->configRepo->load();
 		$this->config_loaded = true;
 
 		// load the whole category out of the DB into the cache
@@ -78,8 +77,8 @@ class PreloadConfig extends BaseConfig
 	public function get(string $cat, string $key, $default_value = null, bool $refresh = false)
 	{
 		if ($refresh) {
-			if ($this->configModel->isConnected()) {
-				$config = $this->configModel->get($cat, $key);
+			if ($this->configRepo->isConnected()) {
+				$config = $this->configRepo->get($cat, $key);
 				if (isset($config)) {
 					$this->configCache->set($cat, $key, $config, Cache::SOURCE_DB);
 				}
@@ -95,7 +94,7 @@ class PreloadConfig extends BaseConfig
 	/**
 	 * {@inheritDoc}
 	 */
-	public function set(string $cat, string $key, $value)
+	public function set(string $cat, string $key, $value): bool
 	{
 		if (!$this->config_loaded) {
 			$this->load();
@@ -105,11 +104,11 @@ class PreloadConfig extends BaseConfig
 		$cached = $this->configCache->set($cat, $key, $value, Cache::SOURCE_DB);
 
 		// If there is no connected adapter, we're finished
-		if (!$this->configModel->isConnected()) {
+		if (!$this->configRepo->isConnected()) {
 			return $cached;
 		}
 
-		$stored = $this->configModel->set($cat, $key, $value);
+		$stored = $this->configRepo->set($cat, $key, $value);
 
 		return $cached && $stored;
 	}
@@ -117,7 +116,7 @@ class PreloadConfig extends BaseConfig
 	/**
 	 * {@inheritDoc}
 	 */
-	public function delete(string $cat, string $key)
+	public function delete(string $cat, string $key): bool
 	{
 		if ($this->config_loaded) {
 			$this->load();
@@ -125,26 +124,12 @@ class PreloadConfig extends BaseConfig
 
 		$cacheRemoved = $this->configCache->delete($cat, $key);
 
-		if (!$this->configModel->isConnected()) {
+		if (!$this->configRepo->isConnected()) {
 			return $cacheRemoved;
 		}
 
-		$storeRemoved = $this->configModel->delete($cat, $key);
+		$storeRemoved = $this->configRepo->delete($cat, $key);
 
 		return $cacheRemoved || $storeRemoved;
 	}
-
-	public function testSetDouble()
-	{
-		$this->configModel->shouldReceive('isConnected')
-						  ->andReturn(true);
-
-		// constructor loading
-		$this->configModel->shouldReceive('load')
-						  ->with('config')
-						  ->andReturn(['config' => ['test' => 'it']])
-						  ->once();
-
-		parent::testSetDouble();
-	}
 }

src/Core/Config/Util/ConfigFileLoader.php

@@ -19,11 +19,11 @@
  *
  */
 
-namespace Friendica\Core\Config\Cache;
+namespace Friendica\Core\Config\Util;
 
-use Exception;
 use Friendica\Core\Addon;
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\Exception\ConfigFileException;
+use Friendica\Core\Config\ValueObject\Cache;
 
 /**
  * The ConfigFileLoader loads config-files and stores them in a ConfigCache ( @see Cache )
@@ -91,7 +91,7 @@ class ConfigFileLoader
 	 * @param array $server The $_SERVER array
 	 * @param bool  $raw    Setup the raw config format
 	 *
-	 * @throws Exception
+	 * @throws ConfigFileException
 	 */
 	public function setupCache(Cache $config, array $server = [], bool $raw = false)
 	{
@@ -122,9 +122,9 @@ class ConfigFileLoader
 	 *
 	 * @return array The config array (empty if no config found)
 	 *
-	 * @throws Exception if the configuration file isn't readable
+	 * @throws ConfigFileException if the configuration file isn't readable
 	 */
-	private function loadStaticConfig($name)
+	private function loadStaticConfig(string $name): array
 	{
 		$configName = $this->staticDir . DIRECTORY_SEPARATOR . $name . '.config.php';
 		$iniName    = $this->staticDir . DIRECTORY_SEPARATOR . $name . '.ini.php';
@@ -143,9 +143,7 @@ class ConfigFileLoader
 	 *
 	 * @param Cache $config The Config cache
 	 *
-	 * @return array The config array (empty if no config found)
-	 *
-	 * @throws Exception if the configuration file isn't readable
+	 * @throws ConfigFileException if the configuration file isn't readable
 	 */
 	private function loadCoreConfig(Cache $config)
 	{
@@ -158,8 +156,6 @@ class ConfigFileLoader
 		foreach ($this->getConfigFiles() as $configFile) {
 			$config->load($this->loadConfigFile($configFile), Cache::SOURCE_FILE);
 		}
-
-		return [];
 	}
 
 	/**
@@ -169,9 +165,9 @@ class ConfigFileLoader
 	 *
 	 * @return array The config array (empty if no config found)
 	 *
-	 * @throws Exception if the configuration file isn't readable
+	 * @throws ConfigFileException if the configuration file isn't readable
 	 */
-	public function loadAddonConfig($name)
+	public function loadAddonConfig(string $name): array
 	{
 		$filepath = $this->baseDir . DIRECTORY_SEPARATOR .   // /var/www/html/
 					Addon::DIRECTORY . DIRECTORY_SEPARATOR . // addon/
@@ -193,9 +189,9 @@ class ConfigFileLoader
 	 *
 	 * @return array The config array (empty if no config was found)
 	 *
-	 * @throws Exception if the configuration file isn't readable
+	 * @throws ConfigFileException if the configuration file isn't readable
 	 */
-	public function loadEnvConfig(array $server)
+	public function loadEnvConfig(array $server): array
 	{
 		$filepath = $this->staticDir . DIRECTORY_SEPARATOR .   // /var/www/html/static/
 					"env.config.php";                          // env.config.php
@@ -224,10 +220,10 @@ class ConfigFileLoader
 	 *
 	 * @return array
 	 */
-	private function getConfigFiles(bool $ini = false)
+	private function getConfigFiles(bool $ini = false): array
 	{
 		$files = scandir($this->configDir);
-		$found = array();
+		$found = [];
 
 		$filePattern = ($ini ? '*.ini.php' : '*.config.php');
 
@@ -252,7 +248,7 @@ class ConfigFileLoader
 	 *
 	 * @deprecated since version 2018.09
 	 */
-	private function loadLegacyConfig($name = '')
+	private function loadLegacyConfig(string $name = ''): array
 	{
 		$name     = !empty($name) ? $name : self::CONFIG_HTCONFIG;
 		$fullName = $this->baseDir . DIRECTORY_SEPARATOR . '.' . $name . '.php';
@@ -322,17 +318,17 @@ class ConfigFileLoader
 	 * @param string $filepath
 	 *
 	 * @return array The configuration array
-	 * @throws Exception
+	 * @throws ConfigFileException
 	 * @deprecated since version 2018.12
 	 */
-	private function loadINIConfigFile($filepath)
+	private function loadINIConfigFile(string $filepath): array
 	{
 		$contents = include($filepath);
 
 		$config = parse_ini_string($contents, true, INI_SCANNER_TYPED);
 
 		if ($config === false) {
-			throw new Exception('Error parsing INI config file ' . $filepath);
+			throw new ConfigFileException('Error parsing INI config file ' . $filepath);
 		}
 
 		return $config;
@@ -353,14 +349,14 @@ class ConfigFileLoader
 	 *
 	 * @return array The config array0
 	 *
-	 * @throws Exception if the config cannot get loaded.
+	 * @throws ConfigFileException if the config cannot get loaded.
 	 */
-	private function loadConfigFile($filepath)
+	private function loadConfigFile(string $filepath): array
 	{
 		$config = include($filepath);
 
 		if (!is_array($config)) {
-			throw new Exception('Error loading config file ' . $filepath);
+			throw new ConfigFileException('Error loading config file ' . $filepath);
 		}
 
 		return $config;

src/Core/Config/Util/ValueConversion.php

@@ -1,8 +1,11 @@
 <?php
 
-namespace Friendica\Core\Config\Model;
+namespace Friendica\Core\Config\Util;
 
-class DbaUtils
+/**
+ * Util class to help to convert from/to (p)config values
+ */
+class ValueConversion
 {
 	/**
 	 * Formats a DB value to a config value
@@ -13,11 +16,11 @@ class DbaUtils
 	 *
 	 * Keep in mind that there aren't any numeric/integer config values in the database
 	 *
-	 * @param null|string $value
+	 * @param string|null $value
 	 *
 	 * @return null|array|string
 	 */
-	public static function toConfigValue($value)
+	public static function toConfigValue(?string $value)
 	{
 		if (!isset($value)) {
 			return null;

src/Core/Config/ValueObject/Cache.php

@@ -19,8 +19,9 @@
  *
  */
 
-namespace Friendica\Core\Config\Cache;
+namespace Friendica\Core\Config\ValueObject;
 
+use Friendica\Core\Config\Util\ConfigFileLoader;
 use ParagonIE\HiddenString\HiddenString;
 
 /**
@@ -45,7 +46,7 @@ class Cache
 	/**
 	 * @var array
 	 */
-	private $config;
+	private $config = [];
 
 	/**
 	 * @var int[][]
@@ -97,15 +98,15 @@ class Cache
 	 * Gets a value from the config cache.
 	 *
 	 * @param string      $cat Config category
-	 * @param string $key Config key
+	 * @param string|null $key Config key
 	 *
 	 * @return null|mixed Returns the value of the Config entry or null if not set
 	 */
-	public function get(string $cat, string $key = null)
+	public function get(string $cat, ?string $key = null)
 	{
 		if (isset($this->config[$cat][$key])) {
 			return $this->config[$cat][$key];
-		} else if (!isset($key) && isset($this->config[$cat])) {
+		} elseif (!isset($key) && isset($this->config[$cat])) {
 			return $this->config[$cat];
 		} else {
 			return null;
@@ -122,7 +123,7 @@ class Cache
 	 *
 	 * @return bool True, if the value is set
 	 */
-	public function set(string $cat, string $key, $value, $source = self::SOURCE_DEFAULT)
+	public function set(string $cat, string $key, $value, int $source = self::SOURCE_DEFAULT): bool
 	{
 		if (!isset($this->config[$cat])) {
 			$this->config[$cat] = [];
@@ -155,7 +156,7 @@ class Cache
 	 *
 	 * @return bool true, if deleted
 	 */
-	public function delete(string $cat, string $key)
+	public function delete(string $cat, string $key): bool
 	{
 		if (isset($this->config[$cat][$key])) {
 			unset($this->config[$cat][$key]);
@@ -173,9 +174,9 @@ class Cache
 	/**
 	 * Returns the whole configuration
 	 *
-	 * @return array The configuration
+	 * @return string[][] The configuration
 	 */
-	public function getAll()
+	public function getAll(): array
 	{
 		return $this->config;
 	}
@@ -183,11 +184,11 @@ class Cache
 	/**
 	 * Returns an array with missing categories/Keys
 	 *
-	 * @param array $config The array to check
+	 * @param string[][] $config The array to check
 	 *
-	 * @return array
+	 * @return string[][]
 	 */
-	public function keyDiff(array $config)
+	public function keyDiff(array $config): array
 	{
 		$return = [];
 

src/Core/Installer.php

@@ -23,7 +23,7 @@ namespace Friendica\Core;
 
 use DOMDocument;
 use Exception;
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Database\Database;
 use Friendica\Database\DBStructure;
 use Friendica\DI;
@@ -678,7 +678,7 @@ class Installer
 	/**
 	 * Setup the default cache for a new installation
 	 *
-	 * @param \Friendica\Core\Config\Cache\Cache $configCache The configuration cache
+	 * @param \Friendica\Core\Config\ValueObject\Cache $configCache The configuration cache
 	 * @param string                                   $basePath    The determined basepath
 	 *
 	 * @throws \Friendica\Network\HTTPException\InternalServerErrorException

src/Core/L10n.php

@@ -21,8 +21,8 @@
 
 namespace Friendica\Core;
 
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\Session\ISession;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\Session\Capability\IHandleSessions;
 use Friendica\Database\Database;
 use Friendica\Util\Strings;
 use Psr\Log\LoggerInterface;
@@ -62,7 +62,7 @@ class L10n
 	 */
 	private $logger;
 
-	public function __construct(IConfig $config, Database $dba, LoggerInterface $logger, ISession $session, array $server, array $get)
+	public function __construct(IManageConfigValues $config, Database $dba, LoggerInterface $logger, IHandleSessions $session, array $server, array $get)
 	{
 		$this->dba    = $dba;
 		$this->logger = $logger;
@@ -85,7 +85,7 @@ class L10n
 	/**
 	 * Sets the language session variable
 	 */
-	private function setSessionVariable(ISession $session)
+	private function setSessionVariable(IHandleSessions $session)
 	{
 		if ($session->get('authenticated') && !$session->get('language')) {
 			$session->set('language', $this->lang);
@@ -103,7 +103,7 @@ class L10n
 		}
 	}
 
-	private function setLangFromSession(ISession $session)
+	private function setLangFromSession(IHandleSessions $session)
 	{
 		if ($session->get('language') !== $this->lang) {
 			$this->loadTranslationTable($session->get('language'));

src/Core/Lock/Capability/ICanLock.php

@@ -19,23 +19,22 @@
  *
  */
 
-namespace Friendica\Core\Lock;
+namespace Friendica\Core\Lock\Capability;
 
 use Friendica\Core\Cache\Enum\Duration;
+use Friendica\Core\Lock\Exception\LockPersistenceException;
 
 /**
  * Lock Interface
  */
-interface ILock
+interface ICanLock
 {
 	/**
 	 * Checks, if a key is currently locked to a or my process
 	 *
 	 * @param string $key The name of the lock
-	 *
-	 * @return bool
 	 */
-	public function isLocked($key);
+	public function isLocked(string $key): bool;
 
 	/**
 	 *
@@ -45,9 +44,9 @@ interface ILock
 	 * @param integer $timeout Seconds until we give up
 	 * @param integer $ttl     Seconds The lock lifespan, must be one of the Cache constants
 	 *
-	 * @return boolean Was the lock successful?
+	 * @throws LockPersistenceException In case the underlying persistence throws errors
 	 */
-	public function acquire($key, $timeout = 120, $ttl = Duration::FIVE_MINUTES);
+	public function acquire(string $key, int $timeout = 120, int $ttl = Duration::FIVE_MINUTES): bool;
 
 	/**
 	 * Releases a lock if it was set by us
@@ -55,32 +54,36 @@ interface ILock
 	 * @param string $key      The Name of the lock
 	 * @param bool   $override Overrides the lock to get released
 	 *
-	 * @return boolean Was the unlock successful?
+	 * @return bool Was the unlock successful?
+	 *
+	 * @throws LockPersistenceException In case the underlying persistence throws errors
 	 */
-	public function release($key, $override = false);
+	public function release(string $key, bool $override = false): bool;
 
 	/**
 	 * Releases all lock that were set by us
 	 *
 	 * @param bool $override Override to release all locks
 	 *
-	 * @return boolean Was the unlock of all locks successful?
+	 * @return bool Was the unlock of all locks successful?
+	 *
+	 * @throws LockPersistenceException In case the underlying persistence throws errors
 	 */
-	public function releaseAll($override = false);
+	public function releaseAll(bool $override = false): bool;
 
 	/**
 	 * Returns the name of the current lock
-	 *
-	 * @return string
 	 */
-	public function getName();
+	public function getName(): string;
 
 	/**
 	 * Lists all locks
 	 *
 	 * @param string prefix optional a prefix to search
 	 *
-	 * @return array Empty if it isn't supported by the cache driver
+	 * @return string[] Empty if it isn't supported by the cache driver
+	 *
+	 * @throws LockPersistenceException In case the underlying persistence throws errors
 	 */
-	public function getLocks(string $prefix = '');
+	public function getLocks(string $prefix = ''): array;
 }

src/Core/Lock/Exception/InvalidLockDriverException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Core\Lock\Exception;
+
+use Throwable;
+
+class InvalidLockDriverException extends \RuntimeException
+{
+	public function __construct($message = "", Throwable $previous = null)
+	{
+		parent::__construct($message, 500, $previous);
+	}
+}

src/Core/Lock/Exception/LockPersistenceException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Core\Lock\Exception;
+
+use Throwable;
+
+class LockPersistenceException extends \RuntimeException
+{
+	public function __construct($message = "", Throwable $previous = null)
+	{
+		parent::__construct($message, 500, $previous);
+	}
+}

src/Core/Lock/Factory/Lock.php

@@ -21,11 +21,12 @@
 
 namespace Friendica\Core\Lock\Factory;
 
-use Friendica\Core\Cache\Factory\CacheFactory;
-use Friendica\Core\Cache\IMemoryCache;
-use Friendica\Core\Cache\Enum\Type;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\Lock;
+use Friendica\Core\Cache\Factory\Cache;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
+use Friendica\Core\Cache\Enum;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\Lock\Capability\ICanLock;
+use Friendica\Core\Lock\Type;
 use Friendica\Database\Database;
 use Psr\Log\LoggerInterface;
 
@@ -36,7 +37,7 @@ use Psr\Log\LoggerInterface;
  *
  * A basic class to generate a LockDriver
  */
-class LockFactory
+class Lock
 {
 	/**
 	 * @var string The default driver for caching
@@ -44,7 +45,7 @@ class LockFactory
 	const DEFAULT_DRIVER = 'default';
 
 	/**
-	 * @var IConfig The configuration to read parameters out of the config
+	 * @var IManageConfigValues The configuration to read parameters out of the config
 	 */
 	private $config;
 
@@ -54,7 +55,7 @@ class LockFactory
 	private $dba;
 
 	/**
-	 * @var CacheFactory The memory cache driver in case we use it
+	 * @var Cache The memory cache driver in case we use it
 	 */
 	private $cacheFactory;
 
@@ -63,7 +64,7 @@ class LockFactory
 	 */
 	private $logger;
 
-	public function __construct(CacheFactory $cacheFactory, IConfig $config, Database $dba, LoggerInterface $logger)
+	public function __construct(Cache $cacheFactory, IManageConfigValues $config, Database $dba, LoggerInterface $logger)
 	{
 		$this->cacheFactory = $cacheFactory;
 		$this->config       = $config;
@@ -77,24 +78,24 @@ class LockFactory
 
 		try {
 			switch ($lock_type) {
-				case Type::MEMCACHE:
-				case Type::MEMCACHED:
-				case Type::REDIS:
-				case Type::APCU:
+				case Enum\Type::MEMCACHE:
+				case Enum\Type::MEMCACHED:
+				case Enum\Type::REDIS:
+				case Enum\Type::APCU:
 					$cache = $this->cacheFactory->create($lock_type);
-					if ($cache instanceof IMemoryCache) {
-						return new Lock\Type\CacheLock($cache);
+					if ($cache instanceof ICanCacheInMemory) {
+						return new Type\CacheLock($cache);
 					} else {
 						throw new \Exception(sprintf('Incompatible cache driver \'%s\' for lock used', $lock_type));
 					}
 					break;
 
 				case 'database':
-					return new Lock\Type\DatabaseLock($this->dba);
+					return new Type\DatabaseLock($this->dba);
 					break;
 
 				case 'semaphore':
-					return new Lock\Type\SemaphoreLock();
+					return new Type\SemaphoreLock();
 					break;
 
 				default:
@@ -114,14 +115,14 @@ class LockFactory
 	 * 2. Cache Locking
 	 * 3. Database Locking
 	 *
-	 * @return Lock\ILock
+	 * @return ICanLock
 	 */
 	private function useAutoDriver()
 	{
 		// 1. Try to use Semaphores for - local - locking
 		if (function_exists('sem_get')) {
 			try {
-				return new Lock\Type\SemaphoreLock();
+				return new Type\SemaphoreLock();
 			} catch (\Exception $exception) {
 				$this->logger->warning('Using Semaphore driver for locking failed.', ['exception' => $exception]);
 			}
@@ -129,11 +130,11 @@ class LockFactory
 
 		// 2. Try to use Cache Locking (don't use the DB-Cache Locking because it works different!)
 		$cache_type = $this->config->get('system', 'cache_driver', 'database');
-		if ($cache_type != Type::DATABASE) {
+		if ($cache_type != Enum\Type::DATABASE) {
 			try {
 				$cache = $this->cacheFactory->create($cache_type);
-				if ($cache instanceof IMemoryCache) {
-					return new Lock\Type\CacheLock($cache);
+				if ($cache instanceof ICanCacheInMemory) {
+					return new Type\CacheLock($cache);
 				}
 			} catch (\Exception $exception) {
 				$this->logger->warning('Using Cache driver for locking failed.', ['exception' => $exception]);
@@ -141,6 +142,6 @@ class LockFactory
 		}
 
 		// 3. Use Database Locking as a Fallback
-		return new Lock\Type\DatabaseLock($this->dba);
+		return new Type\DatabaseLock($this->dba);
 	}
 }

src/Core/Lock/Type/AbstractLock.php

@@ -21,12 +21,12 @@
 
 namespace Friendica\Core\Lock\Type;
 
-use Friendica\Core\Lock\ILock;
+use Friendica\Core\Lock\Capability\ICanLock;
 
 /**
  * Basic class for Locking with common functions (local acquired locks, releaseAll, ..)
  */
-abstract class BaseLock implements ILock
+abstract class AbstractLock implements ICanLock
 {
 	/**
 	 * @var array The local acquired locks
@@ -40,7 +40,7 @@ abstract class BaseLock implements ILock
 	 *
 	 * @return bool      Returns true if the lock is set
 	 */
-	protected function hasAcquiredLock($key)
+	protected function hasAcquiredLock(string $key): bool
 	{
 		return isset($this->acquireLock[$key]) && $this->acquiredLocks[$key] === true;
 	}
@@ -50,7 +50,7 @@ abstract class BaseLock implements ILock
 	 *
 	 * @param string $key The Name of the lock
 	 */
-	protected function markAcquire($key)
+	protected function markAcquire(string $key)
 	{
 		$this->acquiredLocks[$key] = true;
 	}
@@ -60,7 +60,7 @@ abstract class BaseLock implements ILock
 	 *
 	 * @param string $key The Name of the lock
 	 */
-	protected function markRelease($key)
+	protected function markRelease(string $key)
 	{
 		unset($this->acquiredLocks[$key]);
 	}
@@ -68,7 +68,7 @@ abstract class BaseLock implements ILock
 	/**
 	 * {@inheritDoc}
 	 */
-	public function releaseAll($override = false)
+	public function releaseAll(bool $override = false): bool
 	{
 		$return = true;
 

src/Core/Lock/Type/CacheLock.php

@@ -21,10 +21,13 @@
 
 namespace Friendica\Core\Lock\Type;
 
+use Friendica\Core\Cache\Capability\ICanCache;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
 use Friendica\Core\Cache\Enum\Duration;
-use Friendica\Core\Cache\IMemoryCache;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
+use Friendica\Core\Lock\Exception\LockPersistenceException;
 
-class CacheLock extends BaseLock
+class CacheLock extends AbstractLock
 {
 	/**
 	 * @var string The static prefix of all locks inside the cache
@@ -32,16 +35,16 @@ class CacheLock extends BaseLock
 	const CACHE_PREFIX = 'lock:';
 
 	/**
-	 * @var \Friendica\Core\Cache\ICache;
+	 * @var ICanCache;
 	 */
 	private $cache;
 
 	/**
 	 * CacheLock constructor.
 	 *
-	 * @param IMemoryCache $cache The CacheDriver for this type of lock
+	 * @param ICanCacheInMemory $cache The CacheDriver for this type of lock
 	 */
-	public function __construct(IMemoryCache $cache)
+	public function __construct(ICanCacheInMemory $cache)
 	{
 		$this->cache = $cache;
 	}
@@ -49,15 +52,16 @@ class CacheLock extends BaseLock
 	/**
 	 * (@inheritdoc)
 	 */
-	public function acquire($key, $timeout = 120, $ttl = Duration::FIVE_MINUTES)
+	public function acquire(string $key, int $timeout = 120, int $ttl = Duration::FIVE_MINUTES): bool
 	{
 		$got_lock = false;
 		$start    = time();
 
-		$cachekey = self::getLockKey($key);
+		$lockKey = self::getLockKey($key);
 
+		try {
 			do {
-			$lock = $this->cache->get($cachekey);
+				$lock = $this->cache->get($lockKey);
 				// When we do want to lock something that was already locked by us.
 				if ((int)$lock == getmypid()) {
 					$got_lock = true;
@@ -66,9 +70,9 @@ class CacheLock extends BaseLock
 				// When we do want to lock something new
 				if (is_null($lock)) {
 					// At first initialize it with "0"
-				$this->cache->add($cachekey, 0);
+					$this->cache->add($lockKey, 0);
 					// Now the value has to be "0" because otherwise the key was used by another process meanwhile
-				if ($this->cache->compareSet($cachekey, 0, getmypid(), $ttl)) {
+					if ($this->cache->compareSet($lockKey, 0, getmypid(), $ttl)) {
 						$got_lock = true;
 						$this->markAcquire($key);
 					}
@@ -78,6 +82,9 @@ class CacheLock extends BaseLock
 					usleep(rand(10000, 200000));
 				}
 			} while (!$got_lock && ((time() - $start) < $timeout));
+		} catch (CachePersistenceException $exception) {
+			throw new LockPersistenceException(sprintf('Cannot acquire lock for key %s', $key), $exception);
+		}
 
 		return $got_lock;
 	}
@@ -85,14 +92,18 @@ class CacheLock extends BaseLock
 	/**
 	 * (@inheritdoc)
 	 */
-	public function release($key, $override = false)
+	public function release(string $key, bool $override = false): bool
 	{
-		$cachekey = self::getLockKey($key);
+		$lockKey = self::getLockKey($key);
 
+		try {
 			if ($override) {
-			$return = $this->cache->delete($cachekey);
+				$return = $this->cache->delete($lockKey);
 			} else {
-			$return = $this->cache->compareDelete($cachekey, getmypid());
+				$return = $this->cache->compareDelete($lockKey, getmypid());
+			}
+		} catch (CachePersistenceException $exception) {
+			throw new LockPersistenceException(sprintf('Cannot release lock for key %s (override %b)', $key, $override), $exception);
 		}
 		$this->markRelease($key);
 
@@ -102,17 +113,21 @@ class CacheLock extends BaseLock
 	/**
 	 * (@inheritdoc)
 	 */
-	public function isLocked($key)
+	public function isLocked(string $key): bool
 	{
-		$cachekey = self::getLockKey($key);
-		$lock     = $this->cache->get($cachekey);
+		$lockKey = self::getLockKey($key);
+		try {
+			$lock = $this->cache->get($lockKey);
+		} catch (CachePersistenceException $exception) {
+			throw new LockPersistenceException(sprintf('Cannot check lock state for key %s', $key), $exception);
+		}
 		return isset($lock) && ($lock !== false);
 	}
 
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
 		return $this->cache->getName();
 	}
@@ -120,11 +135,15 @@ class CacheLock extends BaseLock
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getLocks(string $prefix = '')
+	public function getLocks(string $prefix = ''): array
 	{
+		try {
 			$locks = $this->cache->getAllKeys(self::CACHE_PREFIX . $prefix);
+		} catch (CachePersistenceException $exception) {
+			throw new LockPersistenceException(sprintf('Cannot get locks with prefix %s', $prefix), $exception);
+		}
 
-		array_walk($locks, function (&$lock, $key) {
+		array_walk($locks, function (&$lock) {
 			$lock = substr($lock, strlen(self::CACHE_PREFIX));
 		});
 
@@ -134,7 +153,7 @@ class CacheLock extends BaseLock
 	/**
 	 * {@inheritDoc}
 	 */
-	public function releaseAll($override = false)
+	public function releaseAll(bool $override = false): bool
 	{
 		$success = parent::releaseAll($override);
 
@@ -154,7 +173,7 @@ class CacheLock extends BaseLock
 	 *
 	 * @return string        The cache key used for the cache
 	 */
-	private static function getLockKey($key)
+	private static function getLockKey(string $key): string
 	{
 		return self::CACHE_PREFIX . $key;
 	}

src/Core/Lock/Type/DatabaseLock.php

@@ -23,13 +23,14 @@ namespace Friendica\Core\Lock\Type;
 
 use Friendica\Core\Cache\Enum\Duration;
 use Friendica\Core\Lock\Enum\Type;
+use Friendica\Core\Lock\Exception\LockPersistenceException;
 use Friendica\Database\Database;
 use Friendica\Util\DateTimeFormat;
 
 /**
  * Locking driver that stores the locks in the database
  */
-class DatabaseLock extends BaseLock
+class DatabaseLock extends AbstractLock
 {
 	/**
 	 * The current ID of the process
@@ -44,25 +45,28 @@ class DatabaseLock extends BaseLock
 	private $dba;
 
 	/**
-	 * @param null|int $pid The Id of the current process (null means determine automatically)
+	 * @param int|null $pid The id of the current process (null means determine automatically)
 	 */
-	public function __construct(Database $dba, $pid = null)
+	public function __construct(Database $dba, ?int $pid = null)
 	{
 		$this->dba = $dba;
-		$this->pid = isset($pid) ? $pid : getmypid();
+		$this->pid = $pid ?? getmypid();
 	}
 
 	/**
 	 * (@inheritdoc)
 	 */
-	public function acquire($key, $timeout = 120, $ttl = Duration::FIVE_MINUTES)
+	public function acquire(string $key, int $timeout = 120, int $ttl = Duration::FIVE_MINUTES): bool
 	{
 		$got_lock = false;
 		$start    = time();
 
+		try {
 			do {
 				$this->dba->lock('locks');
-			$lock = $this->dba->selectFirst('locks', ['locked', 'pid'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
+				$lock = $this->dba->selectFirst('locks', ['locked', 'pid'], [
+					'`name` = ? AND `expires` >= ?', $key,DateTimeFormat::utcNow()
+				]);
 
 				if ($this->dba->isResult($lock)) {
 					if ($lock['locked']) {
@@ -72,11 +76,19 @@ class DatabaseLock extends BaseLock
 						}
 					}
 					if (!$lock['locked']) {
-					$this->dba->update('locks', ['locked' => true, 'pid' => $this->pid, 'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds')], ['name' => $key]);
+						$this->dba->update('locks', [
+							'locked'  => true,
+							'pid'     => $this->pid,
+							'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds')
+						], ['name' => $key]);
 						$got_lock = true;
 					}
 				} else {
-				$this->dba->insert('locks', ['name' => $key, 'locked' => true, 'pid' => $this->pid, 'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds')]);
+					$this->dba->insert('locks', [
+						'name'    => $key,
+						'locked'  => true,
+						'pid'     => $this->pid,
+						'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds')]);
 					$got_lock = true;
 					$this->markAcquire($key);
 				}
@@ -87,6 +99,9 @@ class DatabaseLock extends BaseLock
 					usleep(rand(100000, 2000000));
 				}
 			} while (!$got_lock && ((time() - $start) < $timeout));
+		} catch (\Exception $exception) {
+			throw new LockPersistenceException(sprintf('Cannot acquire lock for key %s', $key), $exception);
+		}
 
 		return $got_lock;
 	}
@@ -94,7 +109,7 @@ class DatabaseLock extends BaseLock
 	/**
 	 * (@inheritdoc)
 	 */
-	public function release($key, $override = false)
+	public function release(string $key, bool $override = false): bool
 	{
 		if ($override) {
 			$where = ['name' => $key];
@@ -102,11 +117,15 @@ class DatabaseLock extends BaseLock
 			$where = ['name' => $key, 'pid' => $this->pid];
 		}
 
+		try {
 			if ($this->dba->exists('locks', $where)) {
 				$return = $this->dba->delete('locks', $where);
 			} else {
 				$return = false;
 			}
+		} catch (\Exception $exception) {
+			throw new LockPersistenceException(sprintf('Cannot release lock for key %s (override %b)', $key, $override), $exception);
+		}
 
 		$this->markRelease($key);
 
@@ -116,7 +135,7 @@ class DatabaseLock extends BaseLock
 	/**
 	 * (@inheritdoc)
 	 */
-	public function releaseAll($override = false)
+	public function releaseAll(bool $override = false): bool
 	{
 		$success = parent::releaseAll($override);
 
@@ -125,7 +144,12 @@ class DatabaseLock extends BaseLock
 		} else {
 			$where = ['pid' => $this->pid];
 		}
+
+		try {
 			$return = $this->dba->delete('locks', $where);
+		} catch (\Exception $exception) {
+			throw new LockPersistenceException(sprintf('Cannot release all lock (override %b)', $override), $exception);
+		}
 
 		$this->acquiredLocks = [];
 
@@ -135,9 +159,14 @@ class DatabaseLock extends BaseLock
 	/**
 	 * (@inheritdoc)
 	 */
-	public function isLocked($key)
+	public function isLocked(string $key): bool
 	{
-		$lock = $this->dba->selectFirst('locks', ['locked'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
+		try {
+			$lock = $this->dba->selectFirst('locks', ['locked'], [
+				'`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
+		} catch (\Exception $exception) {
+			throw new LockPersistenceException(sprintf('Cannot check lock state for key %s', $key), $exception);
+		}
 
 		if ($this->dba->isResult($lock)) {
 			return $lock['locked'] !== false;
@@ -149,7 +178,7 @@ class DatabaseLock extends BaseLock
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
 		return Type::DATABASE;
 	}
@@ -157,8 +186,9 @@ class DatabaseLock extends BaseLock
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getLocks(string $prefix = '')
+	public function getLocks(string $prefix = ''): array
 	{
+		try {
 			if (empty($prefix)) {
 				$where = ['`expires` >= ?', DateTimeFormat::utcNow()];
 			} else {
@@ -171,7 +201,11 @@ class DatabaseLock extends BaseLock
 			while ($key = $this->dba->fetch($stmt)) {
 				array_push($keys, $key['name']);
 			}
+		} catch (\Exception $exception) {
+			throw new LockPersistenceException(sprintf('Cannot get lock with prefix %s', $prefix), $exception);
+		} finally {
 			$this->dba->close($stmt);
+		}
 
 		return $keys;
 	}

src/Core/Lock/Type/SemaphoreLock.php

@@ -23,16 +23,17 @@ namespace Friendica\Core\Lock\Type;
 
 use Friendica\Core\Cache\Enum\Duration;
 use Friendica\Core\Lock\Enum\Type;
+use Friendica\Core\Lock\Exception\InvalidLockDriverException;
 use function get_temppath;
 
-class SemaphoreLock extends BaseLock
+class SemaphoreLock extends AbstractLock
 {
 	private static $semaphore = [];
 
 	public function __construct()
 	{
 		if (!function_exists('sem_get')) {
-			throw new \Exception('Semaphore lock not supported');
+			throw new InvalidLockDriverException('Semaphore lock not supported');
 		}
 	}
 
@@ -57,11 +58,11 @@ class SemaphoreLock extends BaseLock
 	/**
 	 * (@inheritdoc)
 	 */
-	public function acquire($key, $timeout = 120, $ttl = Duration::FIVE_MINUTES)
+	public function acquire(string $key, int $timeout = 120, int $ttl = Duration::FIVE_MINUTES): bool
 	{
 		self::$semaphore[$key] = sem_get(self::semaphoreKey($key));
 		if (!empty(self::$semaphore[$key])) {
-			if ((bool)sem_acquire(self::$semaphore[$key], ($timeout === 0))) {
+			if (sem_acquire(self::$semaphore[$key], ($timeout === 0))) {
 				$this->markAcquire($key);
 				return true;
 			}
@@ -76,7 +77,7 @@ class SemaphoreLock extends BaseLock
 	 * @param bool $override not necessary parameter for semaphore locks since the lock lives as long as the execution
 	 *                       of the using function
 	 */
-	public function release($key, $override = false)
+	public function release(string $key, bool $override = false): bool
 	{
 		$success = false;
 
@@ -96,7 +97,7 @@ class SemaphoreLock extends BaseLock
 	/**
 	 * (@inheritdoc)
 	 */
-	public function isLocked($key)
+	public function isLocked(string $key): bool
 	{
 		return isset(self::$semaphore[$key]);
 	}
@@ -104,7 +105,7 @@ class SemaphoreLock extends BaseLock
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getName()
+	public function getName(): string
 	{
 		return Type::SEMAPHORE;
 	}
@@ -112,7 +113,7 @@ class SemaphoreLock extends BaseLock
 	/**
 	 * {@inheritDoc}
 	 */
-	public function getLocks(string $prefix = '')
+	public function getLocks(string $prefix = ''): array
 	{
 		// We can just return our own semaphore keys, since we don't know
 		// the state of other semaphores, even if the .sem files exists
@@ -136,7 +137,7 @@ class SemaphoreLock extends BaseLock
 	/**
 	 * {@inheritDoc}
 	 */
-	public function releaseAll($override = false)
+	public function releaseAll(bool $override = false): bool
 	{
 		// Semaphores are just alive during a run, so there is no need to release
 		// You can just release your own locks

src/Core/PConfig/Capability/IManagePersonalConfigValues.php

@@ -19,16 +19,15 @@
  *
  */
 
-namespace Friendica\Core\PConfig;
+namespace Friendica\Core\PConfig\Capability;
 
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\PConfig\ValueObject;
 
 /**
  * Interface for accessing user specific configurations
  */
-interface IPConfig
+interface IManagePersonalConfigValues
 {
-
 	/**
 	 * Loads all configuration values of a user's config family into a cached storage.
 	 *
@@ -38,18 +37,16 @@ interface IPConfig
 	 * @param string $cat The category of the configuration value
 	 *
 	 * @return array The loaded config array
-	 * @see Cache
-	 *
 	 */
-	function load(int $uid, string $cat = 'config');
+	public function load(int $uid, string $cat = 'config'): array;
 
 	/**
 	 * Get a particular user's config variable given the category name
 	 * ($cat) and a key.
 	 *
 	 * Get a particular user's config value from the given category ($cat)
-	 * and the $key with the $uid from a cached storage either from the $this->configAdapter
-	 * (@see IConfigAdapter) or from the $this->configCache (@see PConfigCache).
+	 * and the $key with the $uid from a cached storage either from the database
+	 * or from the configCache
 	 *
 	 * @param int     $uid           The user_id
 	 * @param string  $cat           The category of the configuration value
@@ -58,8 +55,9 @@ interface IPConfig
 	 * @param boolean $refresh       optional, If true the config is loaded from the db and not from the cache (default: false)
 	 *
 	 * @return mixed Stored value or null if it does not exist
+	 *
 	 */
-	function get(int $uid, string $cat, string $key, $default_value = null, bool $refresh = false);
+	public function get(int $uid, string $cat, string $key, $default_value = null, bool $refresh = false);
 
 	/**
 	 * Sets a configuration value for a user
@@ -76,14 +74,12 @@ interface IPConfig
 	 *
 	 * @return bool Operation success
 	 */
-	function set(int $uid, string $cat, string $key, $value);
+	public function set(int $uid, string $cat, string $key, $value): bool;
 
 	/**
-	 * Deletes the given key from the users's configuration.
+	 * Deletes the given key from the users configuration.
 	 *
-	 * Removes the configured value from the stored cache in $this->configCache
-	 * (@see ConfigCache) and removes it from the database (@see IConfigAdapter)
-	 *  with the given $uid.
+	 * Removes the configured value from the stored cache and removes it from the database with the given $uid.
 	 *
 	 * @param int    $uid The user_id
 	 * @param string $cat The category of the configuration value
@@ -91,13 +87,13 @@ interface IPConfig
 	 *
 	 * @return bool
 	 */
-	function delete(int $uid, string $cat, string $key);
+	public function delete(int $uid, string $cat, string $key): bool;
 
 
 	/**
 	 * Returns the Config Cache
 	 *
-	 * @return \Friendica\Core\PConfig\Cache\Cache
+	 * @return ValueObject\Cache
 	 */
-	function getCache();
+	public function getCache(): ValueObject\Cache;
 }

src/Core/PConfig/Exception/PConfigPersistenceException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Friendica\Core\PConfig\Exception;
+
+use Throwable;
+
+class PConfigPersistenceException extends \RuntimeException
+{
+	public function __construct($message = "", Throwable $previous = null)
+	{
+		parent::__construct($message, 500, $previous);
+	}
+}

src/Core/PConfig/Factory/PConfig.php

@@ -21,26 +21,27 @@
 
 namespace Friendica\Core\PConfig\Factory;
 
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\PConfig\IPConfig;
-use Friendica\Core\PConfig\Model\PConfig as PConfigModel;
+use Friendica\Core\Config\ValueObject\Cache;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
+use Friendica\Core\PConfig\Repository;
 use Friendica\Core\PConfig\Type;
+use Friendica\Core\PConfig\ValueObject;
 
-class PConfigFactory
+class PConfig
 {
 	/**
 	 * @param Cache              $configCache  The config cache
-	 * @param \Friendica\Core\PConfig\Cache\Cache $pConfigCache The personal config cache
-	 * @param PConfigModel                        $configModel  The configuration model
+	 * @param ValueObject\Cache  $pConfigCache The personal config cache
+	 * @param Repository\PConfig $configRepo   The configuration model
 	 *
-	 * @return IPConfig
+	 * @return IManagePersonalConfigValues
 	 */
-	public function create(Cache $configCache, \Friendica\Core\PConfig\Cache\Cache $pConfigCache, PConfigModel $configModel)
+	public function create(Cache $configCache, ValueObject\Cache $pConfigCache, Repository\PConfig $configRepo): IManagePersonalConfigValues
 	{
 		if ($configCache->get('system', 'config_adapter') === 'preload') {
-			$configuration = new Type\PreloadPConfig($pConfigCache, $configModel);
+			$configuration = new Type\PreloadPConfig($pConfigCache, $configRepo);
 		} else {
-			$configuration = new Type\JitPConfig($pConfigCache, $configModel);
+			$configuration = new Type\JitPConfig($pConfigCache, $configRepo);
 		}
 
 		return $configuration;

src/Core/PConfig/Repository/PConfig.php

@@ -19,9 +19,10 @@
  *
  */
 
-namespace Friendica\Core\PConfig\Model;
+namespace Friendica\Core\PConfig\Repository;
 
-use Friendica\Core\Config\Model\DbaUtils;
+use Friendica\Core\Config\Util\ValueConversion;
+use Friendica\Core\PConfig\Exception\PConfigPersistenceException;
 use Friendica\Database\Database;
 
 /**
@@ -29,15 +30,14 @@ use Friendica\Database\Database;
  */
 class PConfig
 {
-	/** @var Database */
-	protected $dba;
+	protected static $table_name = 'pconfig';
 
-	/**
-	 * @param Database $dba The database connection of this model
-	 */
-	public function __construct(Database $dba)
+	/** @var Database */
+	protected $db;
+
+	public function __construct(Database $db)
 	{
-		$this->dba = $dba;
+		$this->db = $db;
 	}
 
 	/**
@@ -45,9 +45,9 @@ class PConfig
 	 *
 	 * @return bool
 	 */
-	public function isConnected()
+	public function isConnected(): bool
 	{
-		return $this->dba->isConnected();
+		return $this->db->isConnected();
 	}
 
 	/**
@@ -56,30 +56,35 @@ class PConfig
 	 * @param int         $uid The id of the user to load
 	 * @param string|null $cat The category of the configuration values to load
 	 *
-	 * @return array The config array
+	 * @return string[][] The config array
 	 *
-	 * @throws \Exception In case DB calls are invalid
+	 * @throws PConfigPersistenceException In case the persistence layer throws errors
 	 */
-	public function load(int $uid, string $cat = null)
+	public function load(int $uid, ?string $cat = null): array
 	{
 		$return = [];
 
+		try {
 			if (empty($cat)) {
-			$configs = $this->dba->select('pconfig', ['cat', 'v', 'k'], ['uid' => $uid]);
+				$configs = $this->db->select(static::$table_name, ['cat', 'v', 'k'], ['uid' => $uid]);
 			} else {
-			$configs = $this->dba->select('pconfig', ['cat', 'v', 'k'], ['cat' => $cat, 'uid' => $uid]);
+				$configs = $this->db->select(static::$table_name, ['cat', 'v', 'k'], ['cat' => $cat, 'uid' => $uid]);
 			}
 
-		while ($config = $this->dba->fetch($configs)) {
+			while ($config = $this->db->fetch($configs)) {
 				$key   = $config['k'];
-			$value = DbaUtils::toConfigValue($config['v']);
+				$value = ValueConversion::toConfigValue($config['v']);
 
 				// just save it in case it is set
 				if (isset($value)) {
 					$return[$config['cat']][$key] = $value;
 				}
 			}
-		$this->dba->close($configs);
+		} catch (\Exception $exception) {
+			throw new PConfigPersistenceException(sprintf('Cannot load config category %s for user %d', $cat, $uid), $exception);
+		} finally {
+			$this->db->close($configs);
+		}
 
 		return $return;
 	}
@@ -96,7 +101,7 @@ class PConfig
 	 *
 	 * @return array|string|null Stored value or null if it does not exist
 	 *
-	 * @throws \Exception In case DB calls are invalid
+	 * @throws PConfigPersistenceException In case the persistence layer throws errors
 	 */
 	public function get(int $uid, string $cat, string $key)
 	{
@@ -104,15 +109,19 @@ class PConfig
 			return null;
 		}
 
-		$config = $this->dba->selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
-		if ($this->dba->isResult($config)) {
-			$value = DbaUtils::toConfigValue($config['v']);
+		try {
+			$config = $this->db->selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+			if ($this->db->isResult($config)) {
+				$value = ValueConversion::toConfigValue($config['v']);
 
 				// just return it in case it is set
 				if (isset($value)) {
 					return $value;
 				}
 			}
+		} catch (\Exception $exception) {
+			throw new PConfigPersistenceException(sprintf('Cannot get config value for category %s, key %s and user %d', $cat, $key, $uid), $exception);
+		}
 
 		return null;
 	}
@@ -130,9 +139,9 @@ class PConfig
 	 *
 	 * @return bool Operation success
 	 *
-	 * @throws \Exception In case DB calls are invalid
+	 * @throws PConfigPersistenceException In case the persistence layer throws errors
 	 */
-	public function set(int $uid, string $cat, string $key, $value)
+	public function set(int $uid, string $cat, string $key, $value): bool
 	{
 		if (!$this->isConnected()) {
 			return false;
@@ -148,11 +157,12 @@ class PConfig
 			return true;
 		}
 
-		$dbvalue = DbaUtils::toDbValue($value);
-
-		$result = $this->dba->update('pconfig', ['v' => $dbvalue], ['uid' => $uid, 'cat' => $cat, 'k' => $key], true);
-
-		return $result;
+		try {
+			$dbValue = ValueConversion::toDbValue($value);
+			return $this->db->update(static::$table_name, ['v' => $dbValue], ['uid' => $uid, 'cat' => $cat, 'k' => $key], true);
+		} catch (\Exception $exception) {
+			throw new PConfigPersistenceException(sprintf('Cannot set config value for category %s, key %s and user %d', $cat, $key, $uid), $exception);
+		}
 	}
 
 	/**
@@ -164,14 +174,18 @@ class PConfig
 	 *
 	 * @return bool Operation success
 	 *
-	 * @throws \Exception In case DB calls are invalid
+	 * @throws PConfigPersistenceException In case the persistence layer throws errors
 	 */
-	public function delete(int $uid, string $cat, string $key)
+	public function delete(int $uid, string $cat, string $key): bool
 	{
 		if (!$this->isConnected()) {
 			return false;
 		}
 
-		return $this->dba->delete('pconfig', ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+		try {
+			return $this->db->delete('pconfig', ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+		} catch (\Exception $exception) {
+			throw new PConfigPersistenceException(sprintf('Cannot delete config value for category %s, key %s and user %d', $cat, $key, $uid), $exception);
+		}
 	}
 }

src/Core/PConfig/Type/AbstractPConfigValues.php

@@ -21,45 +21,45 @@
 
 namespace Friendica\Core\PConfig\Type;
 
-use Friendica\Core\PConfig\Cache\Cache;
-use Friendica\Core\PConfig\IPConfig;
-use Friendica\Model;
+use Friendica\Core\PConfig\Repository;
+use Friendica\Core\PConfig\ValueObject\Cache;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 
 /**
  * This class is responsible for the user-specific configuration values in Friendica
- * The values are set through the Config-DB-Table (per Config-DB-model @see Model\Config\PConfig)
+ * The values are set through the Config-DB-Table (per Config-DB-model @see Repository\PConfig)
  *
- * The configuration cache (@see Cache\PConfigCache) is used for temporary caching of database calls. This will
+ * The configuration cache (@see Cache) is used for temporary caching of database calls. This will
  * increase the performance.
  */
-abstract class BasePConfig implements IPConfig
+abstract class AbstractPConfigValues implements IManagePersonalConfigValues
 {
 	/**
-	 * @var \Friendica\Core\PConfig\Cache\Cache
+	 * @var Cache
 	 */
 	protected $configCache;
 
 	/**
-	 * @var \Friendica\Core\PConfig\Model\PConfig
+	 * @var Repository\PConfig
 	 */
 	protected $configModel;
 
 	/**
-	 * @param \Friendica\Core\PConfig\Cache\Cache   $configCache The configuration cache
-	 * @param \Friendica\Core\PConfig\Model\PConfig $configModel The configuration model
+	 * @param Cache              $configCache The configuration cache
+	 * @param Repository\PConfig $configRepo  The configuration model
 	 */
-	public function __construct(Cache $configCache, \Friendica\Core\PConfig\Model\PConfig $configModel)
+	public function __construct(Cache $configCache, Repository\PConfig $configRepo)
 	{
 		$this->configCache = $configCache;
-		$this->configModel = $configModel;
+		$this->configModel = $configRepo;
 	}
 
 	/**
 	 * Returns the Config Cache
 	 *
-	 * @return \Friendica\Core\PConfig\Cache\Cache
+	 * @return Cache
 	 */
-	public function getCache()
+	public function getCache(): Cache
 	{
 		return $this->configCache;
 	}

src/Core/PConfig/Type/JitPConfig.php

@@ -21,8 +21,8 @@
 
 namespace Friendica\Core\PConfig\Type;
 
-use Friendica\Core\PConfig\Cache\Cache;
-use Friendica\Model;
+use Friendica\Core\PConfig\Repository;
+use Friendica\Core\PConfig\ValueObject;
 
 /**
  * This class implements the Just-In-Time configuration, which will cache
@@ -31,7 +31,7 @@ use Friendica\Model;
  * Default Configuration type.
  * Provides the best performance for pages loading few configuration variables.
  */
-class JitPConfig extends BasePConfig
+class JitPConfig extends AbstractPConfigValues
 {
 	/**
 	 * @var array Array of already loaded db values (even if there was no value)
@@ -39,12 +39,12 @@ class JitPConfig extends BasePConfig
 	private $db_loaded;
 
 	/**
-	 * @param Cache                                 $configCache The configuration cache
-	 * @param \Friendica\Core\PConfig\Model\PConfig $configModel The configuration model
+	 * @param ValueObject\Cache  $configCache The configuration cache
+	 * @param Repository\PConfig $configRepo  The configuration model
 	 */
-	public function __construct(Cache $configCache, \Friendica\Core\PConfig\Model\PConfig $configModel)
+	public function __construct(ValueObject\Cache $configCache, Repository\PConfig $configRepo)
 	{
-		parent::__construct($configCache, $configModel);
+		parent::__construct($configCache, $configRepo);
 		$this->db_loaded = [];
 	}
 
@@ -52,11 +52,11 @@ class JitPConfig extends BasePConfig
 	 * {@inheritDoc}
 	 *
 	 */
-	public function load(int $uid, string $cat = 'config')
+	public function load(int $uid, string $cat = 'config'): array
 	{
 		// If not connected or no uid, do nothing
 		if (!$uid || !$this->configModel->isConnected()) {
-			return;
+			return [];
 		}
 
 		$config = $this->configModel->load($uid, $cat);
@@ -84,14 +84,12 @@ class JitPConfig extends BasePConfig
 
 		// if the value isn't loaded or refresh is needed, load it to the cache
 		if ($this->configModel->isConnected() &&
-		    (empty($this->db_loaded[$uid][$cat][$key]) ||
-		     $refresh)) {
+			(empty($this->db_loaded[$uid][$cat][$key]) || $refresh)) {
+			$dbValue = $this->configModel->get($uid, $cat, $key);
 
-			$dbvalue = $this->configModel->get($uid, $cat, $key);
-
-			if (isset($dbvalue)) {
-				$this->configCache->set($uid, $cat, $key, $dbvalue);
-				unset($dbvalue);
+			if (isset($dbValue)) {
+				$this->configCache->set($uid, $cat, $key, $dbValue);
+				unset($dbValue);
 			}
 
 			$this->db_loaded[$uid][$cat][$key] = true;
@@ -106,7 +104,7 @@ class JitPConfig extends BasePConfig
 	/**
 	 * {@inheritDoc}
 	 */
-	public function set(int $uid, string $cat, string $key, $value)
+	public function set(int $uid, string $cat, string $key, $value): bool
 	{
 		if (!$uid) {
 			return false;
@@ -130,7 +128,7 @@ class JitPConfig extends BasePConfig
 	/**
 	 * {@inheritDoc}
 	 */
-	public function delete(int $uid, string $cat, string $key)
+	public function delete(int $uid, string $cat, string $key): bool
 	{
 		if (!$uid) {
 			return false;

src/Core/PConfig/Type/PreloadPConfig.php

@@ -21,8 +21,8 @@
 
 namespace Friendica\Core\PConfig\Type;
 
-use Friendica\Core\PConfig\Cache\Cache;
-use Friendica\Model;
+use Friendica\Core\PConfig\Repository;
+use Friendica\Core\PConfig\ValueObject;
 
 /**
  * This class implements the preload configuration, which will cache
@@ -30,18 +30,18 @@ use Friendica\Model;
  *
  * Minimizes the number of database queries to retrieve configuration values at the cost of memory.
  */
-class PreloadPConfig extends BasePConfig
+class PreloadPConfig extends AbstractPConfigValues
 {
 	/** @var array */
 	private $config_loaded;
 
 	/**
-	 * @param \Friendica\Core\PConfig\Cache\Cache   $configCache The configuration cache
-	 * @param \Friendica\Core\PConfig\Model\PConfig $configModel The configuration model
+	 * @param ValueObject\Cache  $configCache The configuration cache
+	 * @param Repository\PConfig $configRepo  The configuration model
 	 */
-	public function __construct(Cache $configCache, \Friendica\Core\PConfig\Model\PConfig $configModel)
+	public function __construct(ValueObject\Cache $configCache, Repository\PConfig $configRepo)
 	{
-		parent::__construct($configCache, $configModel);
+		parent::__construct($configCache, $configRepo);
 		$this->config_loaded = [];
 	}
 
@@ -51,16 +51,16 @@ class PreloadPConfig extends BasePConfig
 	 * This loads all config values everytime load is called
 	 *
 	 */
-	public function load(int $uid, string $cat = 'config')
+	public function load(int $uid, string $cat = 'config'): array
 	{
 		// Don't load the whole configuration twice or with invalid uid
 		if (!$uid || !empty($this->config_loaded[$uid])) {
-			return;
+			return [];
 		}
 
 		// If not connected, do nothing
 		if (!$this->configModel->isConnected()) {
-			return;
+			return [];
 		}
 
 		$config                    = $this->configModel->load($uid);
@@ -101,7 +101,7 @@ class PreloadPConfig extends BasePConfig
 	/**
 	 * {@inheritDoc}
 	 */
-	public function set(int $uid, string $cat, string $key, $value)
+	public function set(int $uid, string $cat, string $key, $value): bool
 	{
 		if (!$uid) {
 			return false;
@@ -127,7 +127,7 @@ class PreloadPConfig extends BasePConfig
 	/**
 	 * {@inheritDoc}
 	 */
-	public function delete(int $uid, string $cat, string $key)
+	public function delete(int $uid, string $cat, string $key): bool
 	{
 		if (!$uid) {
 			return false;

src/Core/PConfig/ValueObject/Cache.php

@@ -19,7 +19,7 @@
  *
  */
 
-namespace Friendica\Core\PConfig\Cache;
+namespace Friendica\Core\PConfig\ValueObject;
 
 use ParagonIE\HiddenString\HiddenString;
 
@@ -31,7 +31,7 @@ class Cache
 	/**
 	 * @var array
 	 */
-	private $config;
+	private $config = [];
 
 	/**
 	 * @var bool
@@ -53,7 +53,7 @@ class Cache
 	 * @param int   $uid
 	 * @param array $config
 	 */
-	public function load($uid, array $config)
+	public function load(int $uid, array $config)
 	{
 		if (!is_int($uid)) {
 			return;
@@ -63,7 +63,6 @@ class Cache
 
 		foreach ($categories as $category) {
 			if (isset($config[$category]) && is_array($config[$category])) {
-
 				$keys = array_keys($config[$category]);
 
 				foreach ($keys as $key) {
@@ -81,11 +80,11 @@ class Cache
 	 *
 	 * @param int    $uid User Id
 	 * @param string $cat Config category
-	 * @param string $key Config key
+	 * @param string|null $key Config key
 	 *
-	 * @return null|string The value of the config entry or null if not set
+	 * @return null|mixed The value of the config entry or null if not set
 	 */
-	public function get($uid, string $cat, string $key = null)
+	public function get(int $uid, string $cat, ?string $key = null)
 	{
 		if (!is_int($uid)) {
 			return null;
@@ -112,7 +111,7 @@ class Cache
 	 *
 	 * @return bool Set successful
 	 */
-	public function set($uid, string $cat, string $key, $value)
+	public function set(int $uid, string $cat, string $key, $value): bool
 	{
 		if (!is_int($uid)) {
 			return false;
@@ -147,7 +146,7 @@ class Cache
 	 *
 	 * @return bool true, if deleted
 	 */
-	public function delete($uid, string $cat, string $key)
+	public function delete(int $uid, string $cat, string $key): bool
 	{
 		if (!is_int($uid)) {
 			return false;
@@ -171,9 +170,9 @@ class Cache
 	/**
 	 * Returns the whole configuration
 	 *
-	 * @return array The configuration
+	 * @return string[][] The configuration
 	 */
-	public function getAll()
+	public function getAll(): array
 	{
 		return $this->config;
 	}
@@ -181,11 +180,11 @@ class Cache
 	/**
 	 * Returns an array with missing categories/Keys
 	 *
-	 * @param array $config The array to check
+	 * @param string[][] $config The array to check
 	 *
-	 * @return array
+	 * @return string[][]
 	 */
-	public function keyDiff(array $config)
+	public function keyDiff(array $config): array
 	{
 		$return = [];
 

src/Core/Process.php

@@ -22,7 +22,7 @@
 namespace Friendica\Core;
 
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Model;
 use Psr\Log\LoggerInterface;
 
@@ -48,7 +48,7 @@ class Process
 	private $mode;
 
 	/**
-	 * @var IConfig
+	 * @var IManageConfigValues
 	 */
 	private $config;
 
@@ -67,7 +67,7 @@ class Process
 	 */
 	private $pid;
 
-	public function __construct(LoggerInterface $logger, App\Mode $mode, IConfig $config, Model\Process $processModel, string $basepath, int $pid)
+	public function __construct(LoggerInterface $logger, App\Mode $mode, IManageConfigValues $config, Model\Process $processModel, string $basepath, int $pid)
 	{
 		$this->logger = $logger;
 		$this->mode = $mode;
@@ -176,7 +176,7 @@ class Process
 			if (count($data) != 2) {
 				continue;
 			}
-			list($key, $val) = $data;
+			[$key, $val] = $data;
 			$meminfo[$key] = (int)trim(str_replace('kB', '', $val));
 			$meminfo[$key] = (int)($meminfo[$key] / 1024);
 		}

src/Core/Session/Capability/IHandleSessions.php

@@ -19,19 +19,19 @@
  *
  */
 
-namespace Friendica\Core\Session;
+namespace Friendica\Core\Session\Capability;
 
 /**
  * Contains all global supported Session methods
  */
-interface ISession
+interface IHandleSessions
 {
 	/**
 	 * Start the current session
 	 *
 	 * @return self The own Session instance
 	 */
-	public function start();
+	public function start(): IHandleSessions;
 
 	/**
 	 * Checks if the key exists in this session
@@ -40,7 +40,7 @@ interface ISession
 	 *
 	 * @return boolean True, if it exists
 	 */
-	public function exists(string $name);
+	public function exists(string $name): bool;
 
 	/**
 	 * Retrieves a key from the session super global or the defaults if the key is missing or the value is falsy.

src/Core/Session/Factory/Session.php

@@ -22,10 +22,12 @@
 namespace Friendica\Core\Session\Factory;
 
 use Friendica\App;
-use Friendica\Core\Cache\ICache;
-use Friendica\Core\Cache\Enum\Type;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\Session;
+use Friendica\Core\Cache\Capability\ICanCache;
+use Friendica\Core\Cache\Enum;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\Session\Capability\IHandleSessions;
+use Friendica\Core\Session\Type;
+use Friendica\Core\Session\Handler;
 use Friendica\Database\Database;
 use Friendica\Util\Profiler;
 use Psr\Log\LoggerInterface;
@@ -33,7 +35,7 @@ use Psr\Log\LoggerInterface;
 /**
  * Factory for creating a valid Session for this run
  */
-class SessionFactory
+class Session
 {
 	/** @var string The plain, PHP internal session management */
 	const HANDLER_NATIVE = 'native';
@@ -47,41 +49,42 @@ class SessionFactory
 	/**
 	 * @param App\Mode            $mode
 	 * @param App\BaseURL         $baseURL
-	 * @param IConfig         $config
+	 * @param IManageConfigValues $config
 	 * @param Database            $dba
-	 * @param ICache          $cache
+	 * @param ICanCache           $cache
 	 * @param LoggerInterface     $logger
+	 * @param Profiler            $profiler
 	 * @param array               $server
 	 *
-	 * @return Session\ISession
+	 * @return IHandleSessions
 	 */
-	public function createSession(App\Mode $mode, App\BaseURL $baseURL, IConfig $config, Database $dba, ICache $cache, LoggerInterface $logger, Profiler $profiler, array $server = [])
+	public function createSession(App\Mode $mode, App\BaseURL $baseURL, IManageConfigValues $config, Database $dba, ICanCache $cache, LoggerInterface $logger, Profiler $profiler, array $server = [])
 	{
 		$profiler->startRecording('session');
 		$session = null;
 
 		try {
 			if ($mode->isInstall() || $mode->isBackend()) {
-				$session = new Session\Type\Memory();
+				$session = new Type\Memory();
 			} else {
 				$session_handler = $config->get('system', 'session_handler', self::HANDLER_DEFAULT);
 				$handler         = null;
 
 				switch ($session_handler) {
 					case self::HANDLER_DATABASE:
-						$handler = new Session\Handler\Database($dba, $logger, $server);
+						$handler = new Handler\Database($dba, $logger, $server);
 						break;
 					case self::HANDLER_CACHE:
 						// In case we're using the db as cache driver, use the native db session, not the cache
-						if ($config->get('system', 'cache_driver') === Type::DATABASE) {
-							$handler = new Session\Handler\Database($dba, $logger, $server);
+						if ($config->get('system', 'cache_driver') === Enum\Type::DATABASE) {
+							$handler = new Handler\Database($dba, $logger, $server);
 						} else {
-							$handler = new Session\Handler\Cache($cache);
+							$handler = new Handler\Cache($cache, $logger);
 						}
 						break;
 				}
 
-				$session = new Session\Type\Native($baseURL, $handler);
+				$session = new Type\Native($baseURL, $handler);
 			}
 		} finally {
 			$profiler->stopRecording();

src/Core/Session/Handler/Cache.php

@@ -21,8 +21,10 @@
 
 namespace Friendica\Core\Session\Handler;
 
-use Friendica\Core\Cache\ICache;
+use Friendica\Core\Cache\Capability\ICanCache;
+use Friendica\Core\Cache\Exception\CachePersistenceException;
 use Friendica\Core\Session;
+use Psr\Log\LoggerInterface;
 use SessionHandlerInterface;
 
 /**
@@ -30,30 +32,38 @@ use SessionHandlerInterface;
  */
 class Cache implements SessionHandlerInterface
 {
-	/** @var ICache */
+	/** @var ICanCache */
 	private $cache;
+	/** @var LoggerInterface */
+	private $logger;
 
-	public function __construct(ICache $cache)
+	public function __construct(ICanCache $cache, LoggerInterface $logger)
 	{
 		$this->cache  = $cache;
+		$this->logger = $logger;
 	}
 
-	public function open($save_path, $session_name)
+	public function open($path, $name): bool
 	{
 		return true;
 	}
 
-	public function read($session_id)
+	public function read($id)
 	{
-		if (empty($session_id)) {
+		if (empty($id)) {
 			return '';
 		}
 
-		$data = $this->cache->get('session:' . $session_id);
+		try {
+			$data = $this->cache->get('session:' . $id);
 			if (!empty($data)) {
 				Session::$exists = true;
 				return $data;
 			}
+		} catch (CachePersistenceException $exception) {
+			$this->logger->warning('Cannot read session.'. ['id' => $id, 'exception' => $exception]);
+			return '';
+		}
 
 		return '';
 	}
@@ -65,36 +75,45 @@ class Cache implements SessionHandlerInterface
 	 * on the case. Uses the Session::expire for existing session, 5 minutes
 	 * for newly created session.
 	 *
-	 * @param string $session_id   Session ID with format: [a-z0-9]{26}
-	 * @param string $session_data Serialized session data
+	 * @param string $id   Session ID with format: [a-z0-9]{26}
+	 * @param string $data Serialized session data
 	 *
-	 * @return boolean Returns false if parameters are missing, true otherwise
-	 * @throws \Exception
+	 * @return bool Returns false if parameters are missing, true otherwise
 	 */
-	public function write($session_id, $session_data)
+	public function write($id, $data): bool
 	{
-		if (!$session_id) {
+		if (!$id) {
 			return false;
 		}
 
-		if (!$session_data) {
-			return $this->destroy($session_id);
+		if (!$data) {
+			return $this->destroy($id);
 		}
 
-		return $this->cache->set('session:' . $session_id, $session_data, Session::$expire);
+		try {
+			return $this->cache->set('session:' . $id, $data, Session::$expire);
+		} catch (CachePersistenceException $exception) {
+			$this->logger->warning('Cannot write session', ['id' => $id, 'exception' => $exception]);
+			return false;
+		}
 	}
 
-	public function close()
+	public function close(): bool
 	{
 		return true;
 	}
 
-	public function destroy($id)
+	public function destroy($id): bool
 	{
+		try {
 			return $this->cache->delete('session:' . $id);
+		} catch (CachePersistenceException $exception) {
+			$this->logger->warning('Cannot destroy session', ['id' => $id, 'exception' => $exception]);
+			return false;
+		}
 	}
 
-	public function gc($maxlifetime)
+	public function gc($max_lifetime): bool
 	{
 		return true;
 	}

src/Core/Session/Handler/Database.php

@@ -52,24 +52,29 @@ class Database implements SessionHandlerInterface
 		$this->server = $server;
 	}
 
-	public function open($save_path, $session_name)
+	public function open($path, $name): bool
 	{
 		return true;
 	}
 
-	public function read($session_id)
+	public function read($id)
 	{
-		if (empty($session_id)) {
+		if (empty($id)) {
 			return '';
 		}
 
-		$session = $this->dba->selectFirst('session', ['data'], ['sid' => $session_id]);
+		try {
+			$session = $this->dba->selectFirst('session', ['data'], ['sid' => $id]);
 			if ($this->dba->isResult($session)) {
 				Session::$exists = true;
 				return $session['data'];
 			}
+		} catch (\Exception $exception) {
+			$this->logger->warning('Cannot read session.'. ['id' => $id, 'exception' => $exception]);
+			return '';
+		}
 
-		$this->logger->notice('no data for session', ['session_id' => $session_id, 'uri' => $this->server['REQUEST_URI'] ?? '']);
+		$this->logger->notice('no data for session', ['session_id' => $id, 'uri' => $this->server['REQUEST_URI'] ?? '']);
 
 		return '';
 	}
@@ -81,49 +86,63 @@ class Database implements SessionHandlerInterface
 	 * on the case. Uses the Session::expire global for existing session, 5 minutes
 	 * for newly created session.
 	 *
-	 * @param string $session_id   Session ID with format: [a-z0-9]{26}
-	 * @param string $session_data Serialized session data
+	 * @param string $id   Session ID with format: [a-z0-9]{26}
+	 * @param string $data Serialized session data
 	 *
-	 * @return boolean Returns false if parameters are missing, true otherwise
-	 * @throws \Exception
+	 * @return bool Returns false if parameters are missing, true otherwise
 	 */
-	public function write($session_id, $session_data)
+	public function write($id, $data): bool
 	{
-		if (!$session_id) {
+		if (!$id) {
 			return false;
 		}
 
-		if (!$session_data) {
-			return $this->destroy($session_id);
+		if (!$data) {
+			return $this->destroy($id);
 		}
 
 		$expire         = time() + Session::$expire;
 		$default_expire = time() + 300;
 
+		try {
 			if (Session::$exists) {
-			$fields    = ['data' => $session_data, 'expire' => $expire];
-			$condition = ["`sid` = ? AND (`data` != ? OR `expire` != ?)", $session_id, $session_data, $expire];
+				$fields    = ['data' => $data, 'expire' => $expire];
+				$condition = ["`sid` = ? AND (`data` != ? OR `expire` != ?)", $id, $data, $expire];
 				$this->dba->update('session', $fields, $condition);
 			} else {
-			$fields = ['sid' => $session_id, 'expire' => $default_expire, 'data' => $session_data];
+				$fields = ['sid' => $id, 'expire' => $default_expire, 'data' => $data];
 				$this->dba->insert('session', $fields);
 			}
+		} catch (\Exception $exception) {
+			$this->logger->warning('Cannot write session.'. ['id' => $id, 'exception' => $exception]);
+			return false;
+		}
 
 		return true;
 	}
 
-	public function close()
+	public function close(): bool
 	{
 		return true;
 	}
 
-	public function destroy($id)
+	public function destroy($id): bool
 	{
+		try {
 			return $this->dba->delete('session', ['sid' => $id]);
+		} catch (\Exception $exception) {
+			$this->logger->warning('Cannot destroy session.'. ['id' => $id, 'exception' => $exception]);
+			return false;
+		}
 	}
 
-	public function gc($maxlifetime)
+	public function gc($max_lifetime): bool
 	{
+		try {
 			return $this->dba->delete('session', ["`expire` < ?", time()]);
+		} catch (\Exception $exception) {
+			$this->logger->warning('Cannot use garbage collector.'. ['exception' => $exception]);
+			return false;
+		}
 	}
 }

src/Core/Session/Type/AbstractSession.php

@@ -21,15 +21,17 @@
 
 namespace Friendica\Core\Session\Type;
 
+use Friendica\Core\Session\Capability\IHandleSessions;
+
 /**
  * Contains the base methods for $_SESSION interaction
  */
-class AbstractSession
+class AbstractSession implements IHandleSessions
 {
 	/**
 	 * {@inheritDoc}
 	 */
-	public function start()
+	public function start(): IHandleSessions
 	{
 		return $this;
 	}
@@ -37,7 +39,7 @@ class AbstractSession
 	/**
 	 * {@inheritDoc}}
 	 */
-	public function exists(string $name)
+	public function exists(string $name): bool
 	{
 		return isset($_SESSION[$name]);
 	}

src/Core/Session/Type/Memory.php

@@ -21,14 +21,14 @@
 
 namespace Friendica\Core\Session\Type;
 
-use Friendica\Core\Session\ISession;
+use Friendica\Core\Session\Capability\IHandleSessions;
 
 /**
  * Usable for backend processes (daemon/worker) and testing
  *
  * @todo after replacing the last direct $_SESSION call, use a internal array instead of the global variable
  */
-class Memory extends AbstractSession implements ISession
+class Memory extends AbstractSession implements IHandleSessions
 {
 	public function __construct()
 	{

src/Core/Session/Type/Native.php

@@ -22,14 +22,14 @@
 namespace Friendica\Core\Session\Type;
 
 use Friendica\App;
-use Friendica\Core\Session\ISession;
+use Friendica\Core\Session\Capability\IHandleSessions;
 use Friendica\Model\User\Cookie;
 use SessionHandlerInterface;
 
 /**
  * The native Session class which uses the PHP internal Session functions
  */
-class Native extends AbstractSession implements ISession
+class Native extends AbstractSession implements IHandleSessions
 {
 	public function __construct(App\BaseURL $baseURL, SessionHandlerInterface $handler = null)
 	{
@@ -49,7 +49,7 @@ class Native extends AbstractSession implements ISession
 	/**
 	 * {@inheritDoc}
 	 */
-	public function start()
+	public function start(): IHandleSessions
 	{
 		session_start();
 		return $this;

src/Core/StorageManager.php

@@ -22,7 +22,7 @@
 namespace Friendica\Core;
 
 use Exception;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Database\Database;
 use Friendica\Model\Storage;
 use Friendica\Network\HTTPException\InternalServerErrorException;
@@ -56,7 +56,7 @@ class StorageManager
 
 	/** @var Database */
 	private $dba;
-	/** @var IConfig */
+	/** @var \Friendica\Core\Config\Capability\IManageConfigValues */
 	private $config;
 	/** @var LoggerInterface */
 	private $logger;
@@ -68,14 +68,14 @@ class StorageManager
 
 	/**
 	 * @param Database            $dba
-	 * @param IConfig         $config
+	 * @param IManageConfigValues $config
 	 * @param LoggerInterface     $logger
 	 * @param L10n                $l10n
 	 *
 	 * @throws Storage\InvalidClassStorageException in case the active backend class is invalid
 	 * @throws Storage\StorageException in case of unexpected errors during the active backend class loading
 	 */
-	public function __construct(Database $dba, IConfig $config, LoggerInterface $logger, L10n $l10n)
+	public function __construct(Database $dba, IManageConfigValues $config, LoggerInterface $logger, L10n $l10n)
 	{
 		$this->dba           = $dba;
 		$this->config        = $config;

src/DI.php

@@ -155,35 +155,35 @@ abstract class DI
 	//
 
 	/**
-	 * @return Core\Cache\ICache
+	 * @return \Friendica\Core\Cache\Capability\ICanCache
 	 */
 	public static function cache()
 	{
-		return self::$dice->create(Core\Cache\ICache::class);
+		return self::$dice->create(Core\Cache\Capability\ICanCache::class);
 	}
 
 	/**
-	 * @return Core\Config\IConfig
+	 * @return \Friendica\Core\Config\Capability\IManageConfigValues
 	 */
 	public static function config()
 	{
-		return self::$dice->create(Core\Config\IConfig::class);
+		return self::$dice->create(Core\Config\Capability\IManageConfigValues::class);
 	}
 
 	/**
-	 * @return Core\PConfig\IPConfig
+	 * @return \Friendica\Core\PConfig\Capability\IManagePersonalConfigValues
 	 */
 	public static function pConfig()
 	{
-		return self::$dice->create(Core\PConfig\IPConfig::class);
+		return self::$dice->create(Core\PConfig\Capability\IManagePersonalConfigValues::class);
 	}
 
 	/**
-	 * @return Core\Lock\ILock
+	 * @return \Friendica\Core\Lock\Capability\ICanLock
 	 */
 	public static function lock()
 	{
-		return self::$dice->create(Core\Lock\ILock::class);
+		return self::$dice->create(Core\Lock\Capability\ICanLock::class);
 	}
 
 	/**
@@ -203,11 +203,11 @@ abstract class DI
 	}
 
 	/**
-	 * @return Core\Session\ISession
+	 * @return \Friendica\Core\Session\Capability\IHandleSessions
 	 */
 	public static function session()
 	{
-		return self::$dice->create(Core\Session\ISession::class);
+		return self::$dice->create(Core\Session\Capability\IHandleSessions::class);
 	}
 
 	/**

src/Database/Database.php

@@ -21,7 +21,7 @@
 
 namespace Friendica\Database;
 
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Core\System;
 use Friendica\Network\HTTPException\InternalServerErrorException;
 use Friendica\Util\DateTimeFormat;
@@ -49,7 +49,7 @@ class Database
 	protected $connected = false;
 
 	/**
-	 * @var Cache
+	 * @var \Friendica\Core\Config\ValueObject\Cache
 	 */
 	protected $configCache;
 	/**

src/Factory/HTTPClientFactory.php

@@ -4,7 +4,7 @@ namespace Friendica\Factory;
 
 use Friendica\App;
 use Friendica\BaseFactory;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Network\HTTPClient;
 use Friendica\Network\IHTTPClient;
 use Friendica\Util\Profiler;
@@ -22,14 +22,14 @@ require_once __DIR__ . '/../../static/dbstructure.config.php';
 
 class HTTPClientFactory extends BaseFactory
 {
-	/** @var IConfig */
+	/** @var IManageConfigValues */
 	private $config;
 	/** @var Profiler */
 	private $profiler;
 	/** @var App\BaseURL */
 	private $baseUrl;
 
-	public function __construct(LoggerInterface $logger, IConfig $config, Profiler $profiler, App\BaseURL $baseUrl)
+	public function __construct(LoggerInterface $logger, IManageConfigValues $config, Profiler $profiler, App\BaseURL $baseUrl)
 	{
 		parent::__construct($logger);
 		$this->config   = $config;

src/Factory/LoggerFactory.php

@@ -21,7 +21,7 @@
 
 namespace Friendica\Factory;
 
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\Logger;
 use Friendica\Database\Database;
 use Friendica\Network\HTTPException\InternalServerErrorException;
@@ -69,13 +69,13 @@ class LoggerFactory
 	 * Creates a new PSR-3 compliant logger instances
 	 *
 	 * @param Database                                              $database   The Friendica Database instance
-	 * @param IConfig    $config     The config
+	 * @param \Friendica\Core\Config\Capability\IManageConfigValues $config     The config
 	 * @param Profiler                                              $profiler   The profiler of the app
 	 * @param FileSystem                                            $fileSystem FileSystem utils
 	 *
 	 * @return LoggerInterface The PSR-3 compliant logger instance
 	 */
-	public function create(Database $database, IConfig $config, Profiler $profiler, FileSystem $fileSystem)
+	public function create(Database $database, IManageConfigValues $config, Profiler $profiler, FileSystem $fileSystem)
 	{
 		if (empty($config->get('system', 'debugging', false))) {
 			$logger = new VoidLogger();
@@ -156,7 +156,7 @@ class LoggerFactory
 	 *
 	 * It should never get filled during normal usage of Friendica
 	 *
-	 * @param IConfig    $config     The config
+	 * @param \Friendica\Core\Config\Capability\IManageConfigValues $config     The config
 	 * @param Profiler                                              $profiler   The profiler of the app
 	 * @param FileSystem                                            $fileSystem FileSystem utils
 	 *
@@ -165,7 +165,7 @@ class LoggerFactory
 	 * @throws InternalServerErrorException
 	 * @throws \Exception
 	 */
-	public static function createDev(IConfig $config, Profiler $profiler, FileSystem $fileSystem)
+	public static function createDev(IManageConfigValues $config, Profiler $profiler, FileSystem $fileSystem)
 	{
 		$debugging   = $config->get('system', 'debugging');
 		$stream      = $config->get('system', 'dlogfile');

src/Model/Storage/FilesystemConfig.php

@@ -21,7 +21,7 @@
 
 namespace Friendica\Model\Storage;
 
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\L10n;
 
 /**
@@ -32,7 +32,7 @@ class FilesystemConfig implements IStorageConfiguration
 	// Default base folder
 	const DEFAULT_BASE_FOLDER = 'storage';
 
-	/** @var IConfig */
+	/** @var IManageConfigValues */
 	private $config;
 
 	/** @var string */
@@ -54,10 +54,10 @@ class FilesystemConfig implements IStorageConfiguration
 	/**
 	 * Filesystem constructor.
 	 *
-	 * @param IConfig         $config
+	 * @param \Friendica\Core\Config\Capability\IManageConfigValues $config
 	 * @param L10n                                                  $l10n
 	 */
-	public function __construct(IConfig $config, L10n $l10n)
+	public function __construct(IManageConfigValues $config, L10n $l10n)
 	{
 		$this->config = $config;
 		$this->l10n   = $l10n;

src/Model/User/Cookie.php

@@ -22,7 +22,7 @@
 namespace Friendica\Model\User;
 
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 
 /**
  * Interacting with the Friendica Cookie of a user
@@ -52,12 +52,12 @@ class Cookie
 	private $data;
 
 	/**
-	 * @param IConfig     $config
+	 * @param \Friendica\Core\Config\Capability\IManageConfigValues $config
 	 * @param App\BaseURL                                           $baseURL
 	 * @param array                                                 $SERVER The $_SERVER array
 	 * @param array                                                 $COOKIE The $_COOKIE array
 	 */
-	public function __construct(IConfig $config, App\BaseURL $baseURL, array $SERVER = [], array $COOKIE = [])
+	public function __construct(IManageConfigValues $config, App\BaseURL $baseURL, array $SERVER = [], array $COOKIE = [])
 	{
 		$this->sslEnabled     = $baseURL->getSSLPolicy() === App\BaseURL::SSL_POLICY_FULL;
 		$this->sitePrivateKey = $config->get('system', 'site_prvkey');

src/Module/Admin/Summary.php

@@ -22,18 +22,18 @@
 namespace Friendica\Module\Admin;
 
 use Friendica\Core\Addon;
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Core\Logger;
 use Friendica\Core\Renderer;
 use Friendica\Core\Update;
 use Friendica\Database\DBA;
 use Friendica\Database\DBStructure;
 use Friendica\DI;
-use Friendica\Core\Config\Factory\ConfigFactory;
+use Friendica\Core\Config\Factory\Config;
 use Friendica\Model\Register;
 use Friendica\Module\BaseAdmin;
 use Friendica\Network\HTTPException\InternalServerErrorException;
-use Friendica\Core\Config\Cache\ConfigFileLoader;
+use Friendica\Core\Config\Util\ConfigFileLoader;
 use Friendica\Util\DateTimeFormat;
 
 class Summary extends BaseAdmin
@@ -152,7 +152,7 @@ class Summary extends BaseAdmin
 		}
 
 		// check legacy basepath settings
-		$configLoader = (new ConfigFactory())->createConfigFileLoader($a->getBasePath(), $_SERVER);
+		$configLoader = (new Config())->createConfigFileLoader($a->getBasePath(), $_SERVER);
 		$configCache = new Cache();
 		$configLoader->setupCache($configCache);
 		$confBasepath = $configCache->get('system', 'basepath');

src/Module/Install.php

@@ -24,7 +24,7 @@ namespace Friendica\Module;
 use Friendica\App;
 use Friendica\BaseModule;
 use Friendica\Core;
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Core\Renderer;
 use Friendica\Core\Theme;
 use Friendica\DI;
@@ -371,7 +371,7 @@ class Install extends BaseModule
 	/**
 	 * Checks the $_POST settings and updates the config Cache for it
 	 *
-	 * @param Cache       $configCache The current config cache
+	 * @param \Friendica\Core\Config\ValueObject\Cache $configCache The current config cache
 	 * @param array                                    $post        The $_POST data
 	 * @param string                                   $cat         The category of the setting
 	 * @param string                                   $key         The key of the setting

src/Navigation/Notifications/Factory/Introduction.php

@@ -27,9 +27,9 @@ use Friendica\App\BaseURL;
 use Friendica\BaseFactory;
 use Friendica\Content\Text\BBCode;
 use Friendica\Core\L10n;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Core\Protocol;
-use Friendica\Core\Session\ISession;
+use Friendica\Core\Session\Capability\IHandleSessions;
 use Friendica\Database\Database;
 use Friendica\Model\Contact;
 use Friendica\Module\BaseNotifications;
@@ -51,14 +51,14 @@ class Introduction extends BaseFactory
 	private $baseUrl;
 	/** @var L10n */
 	private $l10n;
-	/** @var IPConfig */
+	/** @var \Friendica\Core\PConfig\Capability\IManagePersonalConfigValues */
 	private $pConfig;
-	/** @var ISession */
+	/** @var \Friendica\Core\Session\Capability\IHandleSessions */
 	private $session;
 	/** @var string */
 	private $nick;
 
-	public function __construct(LoggerInterface $logger, Database $dba, BaseURL $baseUrl, L10n $l10n, App $app, IPConfig $pConfig, ISession $session)
+	public function __construct(LoggerInterface $logger, Database $dba, BaseURL $baseUrl, L10n $l10n, App $app, IManagePersonalConfigValues $pConfig, IHandleSessions $session)
 	{
 		parent::__construct($logger);
 

src/Navigation/Notifications/Repository/Notify.php

@@ -5,7 +5,7 @@ namespace Friendica\Navigation\Notifications\Repository;
 use Friendica\App\BaseURL;
 use Friendica\BaseRepository;
 use Friendica\Content\Text\Plaintext;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
@@ -33,7 +33,7 @@ class Notify extends BaseRepository
 	/** @var BaseURL  */
 	protected $baseUrl;
 
-	/** @var IConfig */
+	/** @var \Friendica\Core\Config\Capability\IManageConfigValues */
 	protected $config;
 
 	/** @var Emailer */
@@ -44,7 +44,7 @@ class Notify extends BaseRepository
 
 	protected static $table_name = 'notify';
 
-	public function __construct(Database $database, LoggerInterface $logger, L10n $l10n, BaseURL $baseUrl, IConfig $config, Emailer $emailer, Factory\Notification $notification, Factory\Notify $factory = null)
+	public function __construct(Database $database, LoggerInterface $logger, L10n $l10n, BaseURL $baseUrl, IManageConfigValues $config, Emailer $emailer, Factory\Notification $notification, Factory\Notify $factory = null)
 	{
 		$this->l10n         = $l10n;
 		$this->baseUrl      = $baseUrl;

src/Security/Authentication.php

@@ -23,8 +23,8 @@ namespace Friendica\Security;
 
 use Exception;
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Core\Hook;
 use Friendica\Core\Session;
 use Friendica\Core\System;
@@ -46,7 +46,7 @@ use Psr\Log\LoggerInterface;
  */
 class Authentication
 {
-	/** @var IConfig */
+	/** @var IManageConfigValues */
 	private $config;
 	/** @var App\Mode */
 	private $mode;
@@ -60,25 +60,25 @@ class Authentication
 	private $logger;
 	/** @var User\Cookie */
 	private $cookie;
-	/** @var Session\ISession */
+	/** @var \Friendica\Core\Session\Capability\IHandleSessions */
 	private $session;
-	/** @var IPConfig */
+	/** @var IManagePersonalConfigValues */
 	private $pConfig;
 
 	/**
 	 * Authentication constructor.
 	 *
-	 * @param IConfig          $config
+	 * @param IManageConfigValues                                $config
 	 * @param App\Mode                                           $mode
 	 * @param App\BaseURL                                        $baseUrl
 	 * @param L10n                                               $l10n
 	 * @param Database                                           $dba
 	 * @param LoggerInterface                                    $logger
 	 * @param User\Cookie                                        $cookie
-	 * @param Session\ISession $session
-	 * @param IPConfig         $pConfig
+	 * @param \Friendica\Core\Session\Capability\IHandleSessions $session
+	 * @param IManagePersonalConfigValues                        $pConfig
 	 */
-	public function __construct(IConfig $config, App\Mode $mode, App\BaseURL $baseUrl, L10n $l10n, Database $dba, LoggerInterface $logger, User\Cookie $cookie, Session\ISession $session, IPConfig $pConfig)
+	public function __construct(IManageConfigValues $config, App\Mode $mode, App\BaseURL $baseUrl, L10n $l10n, Database $dba, LoggerInterface $logger, User\Cookie $cookie, Session\Capability\IHandleSessions $session, IManagePersonalConfigValues $pConfig)
 	{
 		$this->config  = $config;
 		$this->mode    = $mode;

src/Security/ExAuth.php

@@ -36,8 +36,8 @@ namespace Friendica\Security;
 
 use Exception;
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Database\Database;
 use Friendica\DI;
 use Friendica\Model\User;
@@ -54,11 +54,11 @@ class ExAuth
 	 */
 	private $appMode;
 	/**
-	 * @var IConfig
+	 * @var \Friendica\Core\Config\Capability\IManageConfigValues
 	 */
 	private $config;
 	/**
-	 * @var IPConfig
+	 * @var IManagePersonalConfigValues
 	 */
 	private $pConfig;
 	/**
@@ -72,13 +72,14 @@ class ExAuth
 
 	/**
 	 * @param App\Mode                                                       $appMode
-	 * @param IConfig      $config
-	 * @param IPConfig     $pConfig
+	 * @param IManageConfigValues                                            $config
+	 * @param \Friendica\Core\PConfig\Capability\IManagePersonalConfigValues $pConfig
 	 * @param Database                                                       $dba
 	 * @param App\BaseURL                                                    $baseURL
+	 *
 	 * @throws Exception
 	 */
-	public function __construct(App\Mode $appMode, IConfig $config, IPConfig $pConfig, Database $dba, App\BaseURL $baseURL)
+	public function __construct(App\Mode $appMode, IManageConfigValues $config, IManagePersonalConfigValues $pConfig, Database $dba, App\BaseURL $baseURL)
 	{
 		$this->appMode = $appMode;
 		$this->config  = $config;

src/Util/EMailer/MailBuilder.php

@@ -23,7 +23,7 @@ namespace Friendica\Util\EMailer;
 
 use Exception;
 use Friendica\App\BaseURL;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\L10n;
 use Friendica\Core\Renderer;
 use Friendica\Model\User;
@@ -42,7 +42,7 @@ abstract class MailBuilder
 
 	/** @var L10n */
 	protected $l10n;
-	/** @var IConfig */
+	/** @var IManageConfigValues */
 	protected $config;
 	/** @var BaseURL */
 	protected $baseUrl;
@@ -64,7 +64,7 @@ abstract class MailBuilder
 	/** @var int */
 	protected $recipientUid = null;
 
-	public function __construct(L10n $l10n, BaseURL $baseUrl, IConfig $config, LoggerInterface $logger)
+	public function __construct(L10n $l10n, BaseURL $baseUrl, IManageConfigValues $config, LoggerInterface $logger)
 	{
 		$this->l10n    = $l10n;
 		$this->baseUrl = $baseUrl;

src/Util/EMailer/NotifyMailBuilder.php

@@ -24,7 +24,7 @@ namespace Friendica\Util\EMailer;
 use Exception;
 use Friendica\App\BaseURL;
 use Friendica\Content\Text\BBCode;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\L10n;
 use Friendica\Core\Renderer;
 use Friendica\Network\HTTPException\InternalServerErrorException;
@@ -70,7 +70,7 @@ class NotifyMailBuilder extends MailBuilder
 	/** @var string The item link */
 	private $itemLink = '';
 
-	public function __construct(L10n $l10n, BaseURL $baseUrl, IConfig $config, LoggerInterface $logger, string $siteEmailAddress, string $siteName)
+	public function __construct(L10n $l10n, BaseURL $baseUrl, IManageConfigValues $config, LoggerInterface $logger, string $siteEmailAddress, string $siteName)
 	{
 		parent::__construct($l10n, $baseUrl, $config, $logger);
 

src/Util/EMailer/SystemMailBuilder.php

@@ -24,7 +24,7 @@ namespace Friendica\Util\EMailer;
 use Exception;
 use Friendica\App\BaseURL;
 use Friendica\Content\Text\BBCode;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\L10n;
 use Friendica\Core\Renderer;
 use Friendica\Network\HTTPException\InternalServerErrorException;
@@ -45,7 +45,7 @@ class SystemMailBuilder extends MailBuilder
 	/** @var string */
 	protected $siteAdmin;
 
-	public function __construct(L10n $l10n, BaseURL $baseUrl, IConfig $config, LoggerInterface $logger,
+	public function __construct(L10n $l10n, BaseURL $baseUrl, IManageConfigValues $config, LoggerInterface $logger,
 	                            string $siteEmailAddress, string $siteName)
 	{
 		parent::__construct($l10n, $baseUrl, $config, $logger);

src/Util/Emailer.php

@@ -22,10 +22,10 @@
 namespace Friendica\Util;
 
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Network\HTTPException\InternalServerErrorException;
 use Friendica\Object\EMail\IEmail;
 use Friendica\Protocol\Email;
@@ -38,9 +38,9 @@ use Psr\Log\LoggerInterface;
  */
 class Emailer
 {
-	/** @var IConfig */
+	/** @var \Friendica\Core\Config\Capability\IManageConfigValues */
 	private $config;
-	/** @var IPConfig */
+	/** @var \Friendica\Core\PConfig\Capability\IManagePersonalConfigValues */
 	private $pConfig;
 	/** @var LoggerInterface */
 	private $logger;
@@ -54,7 +54,7 @@ class Emailer
 	/** @var string */
 	private $siteEmailName;
 
-	public function __construct(IConfig $config, IPConfig $pConfig, App\BaseURL $baseURL, LoggerInterface $logger,
+	public function __construct(IManageConfigValues $config, IManagePersonalConfigValues $pConfig, App\BaseURL $baseURL, LoggerInterface $logger,
 	                            L10n $defaultLang)
 	{
 		$this->config      = $config;

src/Util/Profiler.php

@@ -21,8 +21,8 @@
 
 namespace Friendica\Util;
 
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\ValueObject\Cache;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\System;
 use Psr\Container\ContainerExceptionInterface;
 use Psr\Container\ContainerInterface;
@@ -69,16 +69,16 @@ class Profiler implements ContainerInterface
 	/**
 	 * Updates the enabling of the current profiler
 	 *
-	 * @param IConfig $config
+	 * @param IManageConfigValues $config
 	 */
-	public function update(IConfig $config)
+	public function update(IManageConfigValues $config)
 	{
 		$this->enabled = $config->get('system', 'profiler');
 		$this->rendertime = $config->get('rendertime', 'callstack');
 	}
 
 	/**
-	 * @param \Friendica\Core\Config\Cache\Cache $configCache The configuration cache
+	 * @param \Friendica\Core\Config\ValueObject\Cache $configCache The configuration cache
 	 */
 	public function __construct(Cache $configCache)
 	{

static/dependencies.config.php

@@ -41,7 +41,7 @@ use Friendica\Core\PConfig;
 use Friendica\Core\L10n;
 use Friendica\Core\Lock;
 use Friendica\Core\Process;
-use Friendica\Core\Session\ISession;
+use Friendica\Core\Session\Capability\IHandleSessions;
 use Friendica\Core\StorageManager;
 use Friendica\Database\Database;
 use Friendica\Factory;
@@ -74,8 +74,8 @@ return [
 			$_SERVER
 		]
 	],
-	Config\Cache\ConfigFileLoader::class => [
-		'instanceOf' => Config\Factory\ConfigFactory::class,
+	Config\Util\ConfigFileLoader::class => [
+		'instanceOf' => Config\Factory\Config::class,
 		'call'       => [
 			['createConfigFileLoader', [
 				[Dice::INSTANCE => '$basepath'],
@@ -83,8 +83,8 @@ return [
 			], Dice::CHAIN_CALL],
 		],
 	],
-	Config\Cache\Cache::class => [
-		'instanceOf' => Config\Factory\ConfigFactory::class,
+	Config\ValueObject\Cache::class => [
+		'instanceOf' => Config\Factory\Config::class,
 		'call'       => [
 			['createCache', [$_SERVER], Dice::CHAIN_CALL],
 		],
@@ -95,14 +95,14 @@ return [
 			['determine', [], Dice::CHAIN_CALL],
 		],
 	],
-	Config\IConfig::class                   => [
-		'instanceOf' => Config\Factory\ConfigFactory::class,
+	Config\Capability\IManageConfigValues::class => [
+		'instanceOf' => Config\Factory\Config::class,
 		'call'       => [
 			['create', [], Dice::CHAIN_CALL],
 		],
 	],
-	PConfig\IPConfig::class => [
-		'instanceOf' => PConfig\Factory\PConfigFactory::class,
+	PConfig\Capability\IManagePersonalConfigValues::class => [
+		'instanceOf' => PConfig\Factory\PConfig::class,
 		'call'       => [
 			['create', [], Dice::CHAIN_CALL],
 		]
@@ -158,20 +158,20 @@ return [
 			['createDev', [], Dice::CHAIN_CALL],
 		]
 	],
-	Cache\ICache::class             => [
-		'instanceOf' => Cache\Factory\CacheFactory::class,
+	Cache\Capability\ICanCache::class => [
+		'instanceOf' => Cache\Factory\Cache::class,
 		'call'       => [
 			['create', [], Dice::CHAIN_CALL],
 		],
 	],
-	Cache\IMemoryCache::class       => [
-		'instanceOf' => Cache\Factory\CacheFactory::class,
+	Cache\Capability\ICanCacheInMemory::class => [
+		'instanceOf' => Cache\Factory\Cache::class,
 		'call'       => [
 			['create', [], Dice::CHAIN_CALL],
 		],
 	],
-	Lock\ILock::class                    => [
-		'instanceOf' => Lock\Factory\LockFactory::class,
+	Lock\Capability\ICanLock::class => [
+		'instanceOf' => Lock\Factory\Lock::class,
 		'call'       => [
 			['create', [], Dice::CHAIN_CALL],
 		],
@@ -206,8 +206,8 @@ return [
 			$_SERVER, $_GET
 		],
 	],
-	ISession::class => [
-		'instanceOf' => \Friendica\Core\Session\Factory\SessionFactory::class,
+	IHandleSessions::class => [
+		'instanceOf' => \Friendica\Core\Session\Factory\Session::class,
 		'call' => [
 			['createSession', [$_SERVER], Dice::CHAIN_CALL],
 			['start', [], Dice::CHAIN_CALL],

tests/FixtureTest.php

@@ -6,10 +6,10 @@
 namespace Friendica\Test;
 
 use Dice\Dice;
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\ValueObject\Cache;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\Session;
-use Friendica\Core\Session\ISession;
+use Friendica\Core\Session\Capability\IHandleSessions;
 use Friendica\Database\Database;
 use Friendica\Database\DBStructure;
 use Friendica\DI;
@@ -33,10 +33,10 @@ abstract class FixtureTest extends DatabaseTest
 		$this->dice = (new Dice())
 			->addRules(include __DIR__ . '/../static/dependencies.config.php')
 			->addRule(Database::class, ['instanceOf' => StaticDatabase::class, 'shared' => true])
-			->addRule(ISession::class, ['instanceOf' => Session\Type\Memory::class, 'shared' => true, 'call' => null]);
+			->addRule(IHandleSessions::class, ['instanceOf' => Session\Type\Memory::class, 'shared' => true, 'call' => null]);
 		DI::init($this->dice);
 
-		/** @var IConfig $config */
+		/** @var IManageConfigValues $config */
 		$configCache = $this->dice->create(Cache::class);
 		$configCache->set('database', 'disable_pdo', true);
 

tests/Util/AppMockTrait.php

@@ -42,7 +42,7 @@ trait AppMockTrait
 	protected $app;
 
 	/**
-	 * @var MockInterface|Config\IConfig The mocked Config Cache
+	 * @var MockInterface|\Friendica\Core\Config\Capability\IManageConfigValues The mocked Config Cache
 	 */
 	protected $configMock;
 
@@ -74,21 +74,21 @@ trait AppMockTrait
 		$this->dice = \Mockery::mock(Dice::class)->makePartial();
 		$this->dice = $this->dice->addRules(include __DIR__ . '/../../static/dependencies.config.php');
 
-		$this->configMock = \Mockery::mock(Config\Cache\Cache::class);
+		$this->configMock = \Mockery::mock(Config\ValueObject\Cache::class);
 		$this->dice->shouldReceive('create')
-		           ->with(Config\Cache\Cache::class)
+		           ->with(Config\ValueObject\Cache::class)
 		           ->andReturn($this->configMock);
 		$this->mode = \Mockery::mock(App\Mode::class);
 		$this->dice->shouldReceive('create')
 		           ->with(App\Mode::class)
 		           ->andReturn($this->mode);
-		$configModel= \Mockery::mock(Config\Model\Config::class);
+		$configModel= \Mockery::mock(Config\Repository\Config::class);
 		// Disable the adapter
 		$configModel->shouldReceive('isConnected')->andReturn(false);
 
 		$config = new Config\Type\JitConfig($this->configMock, $configModel);
 		$this->dice->shouldReceive('create')
-		           ->with(Config\IConfig::class)
+		           ->with(Config\Capability\IManageConfigValues::class)
 		           ->andReturn($config);
 
 		// Mocking App and most used functions

tests/functional/DependencyCheckTest.php

@@ -23,15 +23,15 @@ namespace Friendica\Test\functional;
 
 use Dice\Dice;
 use Friendica\App;
-use Friendica\Core\Cache\ICache;
-use Friendica\Core\Cache\IMemoryCache;
-use Friendica\Core\Config\Cache\Cache;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\Lock\ILock;
+use Friendica\Core\Cache\Capability\ICanCache;
+use Friendica\Core\Cache\Capability\ICanCacheInMemory;
+use Friendica\Core\Config\ValueObject\Cache;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\Lock\Capability\ICanLock;
 use Friendica\Database\Database;
 use Friendica\Test\Util\VFSTrait;
 use Friendica\Util\BasePath;
-use Friendica\Core\Config\Cache\ConfigFileLoader;
+use Friendica\Core\Config\Util\ConfigFileLoader;
 use Friendica\Util\Profiler;
 use PHPUnit\Framework\TestCase;
 use Psr\Log\LoggerInterface;
@@ -158,10 +158,10 @@ class DependencyCheckTest extends TestCase
 
 	public function testConfiguration()
 	{
-		/** @var IConfig $config */
-		$config = $this->dice->create(IConfig::class);
+		/** @var IManageConfigValues $config */
+		$config = $this->dice->create(IManageConfigValues::class);
 
-		self::assertInstanceOf(IConfig::class, $config);
+		self::assertInstanceOf(IManageConfigValues::class, $config);
 
 		self::assertNotEmpty($config->get('database', 'username'));
 	}
@@ -176,8 +176,8 @@ class DependencyCheckTest extends TestCase
 
 	public function testDevLogger()
 	{
-		/** @var IConfig $config */
-		$config = $this->dice->create(IConfig::class);
+		/** @var IManageConfigValues $config */
+		$config = $this->dice->create(IManageConfigValues::class);
 		$config->set('system', 'dlogfile', $this->root->url() . '/friendica.log');
 
 		/** @var LoggerInterface $logger */
@@ -188,26 +188,26 @@ class DependencyCheckTest extends TestCase
 
 	public function testCache()
 	{
-		/** @var ICache $cache */
-		$cache = $this->dice->create(ICache::class);
+		/** @var ICanCache $cache */
+		$cache = $this->dice->create(ICanCache::class);
 
-		self::assertInstanceOf(ICache::class, $cache);
+		self::assertInstanceOf(ICanCache::class, $cache);
 	}
 
 	public function testMemoryCache()
 	{
-		/** @var IMemoryCache $cache */
-		$cache = $this->dice->create(IMemoryCache::class);
+		/** @var ICanCacheInMemory $cache */
+		$cache = $this->dice->create(ICanCacheInMemory::class);
 
 		// We need to check "just" ICache, because the default Cache is DB-Cache, which isn't a memorycache
-		self::assertInstanceOf(ICache::class, $cache);
+		self::assertInstanceOf(ICanCache::class, $cache);
 	}
 
 	public function testLock()
 	{
-		/** @var ILock $cache */
-		$lock = $this->dice->create(ILock::class);
+		/** @var ICanLock $cache */
+		$lock = $this->dice->create(ICanLock::class);
 
-		self::assertInstanceOf(ILock::class, $lock);
+		self::assertInstanceOf(ICanLock::class, $lock);
 	}
 }

tests/legacy/ApiTest.php

@@ -6,8 +6,8 @@
 namespace Friendica\Test\legacy;
 
 use Friendica\App;
-use Friendica\Core\Config\IConfig;
-use Friendica\Core\PConfig\IPConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
+use Friendica\Core\PConfig\Capability\IManagePersonalConfigValues;
 use Friendica\Core\Protocol;
 use Friendica\DI;
 use Friendica\Network\HTTPException;
@@ -45,7 +45,7 @@ class ApiTest extends FixtureTest
 	/** @var App */
 	protected $app;
 
-	/** @var IConfig */
+	/** @var IManageConfigValues */
 	protected $config;
 
 	/**
@@ -59,8 +59,8 @@ class ApiTest extends FixtureTest
 
 		parent::setUp();
 
-		/** @var IConfig $config */
-		$this->config = $this->dice->create(IConfig::class);
+		/** @var \Friendica\Core\Config\Capability\IManageConfigValues $config */
+		$this->config = $this->dice->create(IManageConfigValues::class);
 
 		$this->config->set('system', 'url', 'http://localhost');
 		$this->config->set('system', 'hostname', 'localhost');
@@ -813,7 +813,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiGetUserWithFrioSchema()
 	{
-		$pConfig = $this->dice->create(IPConfig::class);
+		$pConfig = $this->dice->create(IManagePersonalConfigValues::class);
 		$pConfig->set($this->selfUser['id'], 'frio', 'schema', 'red');
 		$user = api_get_user($this->app);
 		self::assertSelfUser($user);
@@ -829,7 +829,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiGetUserWithEmptyFrioSchema()
 	{
-		$pConfig = $this->dice->create(IPConfig::class);
+		$pConfig = $this->dice->create(IManagePersonalConfigValues::class);
 		$pConfig->set($this->selfUser['id'], 'frio', 'schema', '---');
 		$user = api_get_user($this->app);
 		self::assertSelfUser($user);
@@ -845,7 +845,7 @@ class ApiTest extends FixtureTest
 	 */
 	public function testApiGetUserWithCustomFrioSchema()
 	{
-		$pConfig = $this->dice->create(IPConfig::class);
+		$pConfig = $this->dice->create(IManagePersonalConfigValues::class);
 		$pConfig->set($this->selfUser['id'], 'frio', 'schema', '---');
 		$pConfig->set($this->selfUser['id'], 'frio', 'nav_bg', '#123456');
 		$pConfig->set($this->selfUser['id'], 'frio', 'link_color', '#123456');

tests/src/App/ModeTest.php

@@ -24,7 +24,7 @@ namespace Friendica\Test\src\App;
 use Detection\MobileDetect;
 use Friendica\App\Mode;
 use Friendica\App\Module;
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Database\Database;
 use Friendica\Test\MockedTest;
 use Friendica\Test\Util\VFSTrait;

tests/src/App/ModuleTest.php

@@ -22,10 +22,10 @@
 namespace Friendica\Test\src\App;
 
 use Friendica\App;
-use Friendica\Core\Cache\ICache;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Cache\Capability\ICanCache;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Friendica\Core\L10n;
-use Friendica\Core\Lock\ILock;
+use Friendica\Core\Lock\Capability\ICanLock;
 use Friendica\LegacyModule;
 use Friendica\Module\HTTPException\PageNotFound;
 use Friendica\Module\WellKnown\HostMeta;
@@ -172,18 +172,18 @@ class ModuleTest extends DatabaseTest
 	 */
 	public function testModuleClass($assert, string $name, string $command, bool $privAdd)
 	{
-		$config = Mockery::mock(IConfig::class);
+		$config = Mockery::mock(IManageConfigValues::class);
 		$config->shouldReceive('get')->with('config', 'private_addons', false)->andReturn($privAdd)->atMost()->once();
 
 		$l10n = Mockery::mock(L10n::class);
 		$l10n->shouldReceive('t')->andReturnUsing(function ($args) { return $args; });
 
-		$cache = Mockery::mock(ICache::class);
+		$cache = Mockery::mock(ICanCache::class);
 		$cache->shouldReceive('get')->with('routerDispatchData')->andReturn('')->atMost()->once();
 		$cache->shouldReceive('get')->with('lastRoutesFileModifiedTime')->andReturn('')->atMost()->once();
 		$cache->shouldReceive('set')->withAnyArgs()->andReturn(false)->atMost()->twice();
 
-		$lock = Mockery::mock(ILock::class);
+		$lock = Mockery::mock(ICanLock::class);
 		$lock->shouldReceive('acquire')->andReturn(true);
 		$lock->shouldReceive('isLocked')->andReturn(false);
 

tests/src/App/RouterTest.php

@@ -22,9 +22,9 @@
 namespace Friendica\Test\src\App;
 
 use Friendica\App\Router;
-use Friendica\Core\Cache\ICache;
+use Friendica\Core\Cache\Capability\ICanCache;
 use Friendica\Core\L10n;
-use Friendica\Core\Lock\ILock;
+use Friendica\Core\Lock\Capability\ICanLock;
 use Friendica\Module;
 use Friendica\Network\HTTPException\MethodNotAllowedException;
 use Friendica\Network\HTTPException\NotFoundException;
@@ -37,11 +37,11 @@ class RouterTest extends TestCase
 	/** @var L10n|MockInterface */
 	private $l10n;
 	/**
-	 * @var ICache
+	 * @var ICanCache
 	 */
 	private $cache;
 	/**
-	 * @var ILock
+	 * @var \Friendica\Core\Lock\Capability\ICanLock
 	 */
 	private $lock;
 
@@ -52,11 +52,11 @@ class RouterTest extends TestCase
 		$this->l10n = Mockery::mock(L10n::class);
 		$this->l10n->shouldReceive('t')->andReturnUsing(function ($args) { return $args; });
 
-		$this->cache = Mockery::mock(ICache::class);
+		$this->cache = Mockery::mock(ICanCache::class);
 		$this->cache->shouldReceive('get')->andReturn(null);
 		$this->cache->shouldReceive('set')->andReturn(false);
 
-		$this->lock = Mockery::mock(ILock::class);
+		$this->lock = Mockery::mock(ICanLock::class);
 		$this->lock->shouldReceive('acquire')->andReturn(true);
 		$this->lock->shouldReceive('isLocked')->andReturn(false);
 	}

tests/src/Console/AutomaticInstallationConsoleTest.php

@@ -24,7 +24,7 @@ namespace Friendica\Test\src\Console;
 use Dice\Dice;
 use Friendica\App;
 use Friendica\Console\AutomaticInstallation;
-use Friendica\Core\Config\Cache\Cache;
+use Friendica\Core\Config\ValueObject\Cache;
 use Friendica\Core\Installer;
 use Friendica\Core\L10n;
 use Friendica\Core\Logger;
@@ -53,7 +53,7 @@ class AutomaticInstallationConsoleTest extends ConsoleTest
 	private $assertFileDb;
 
 	/**
-	 * @var \Friendica\Core\Config\Cache\Cache The configuration cache to check after each test
+	 * @var \Friendica\Core\Config\ValueObject\Cache The configuration cache to check after each test
 	 */
 	private $configCache;
 

tests/src/Console/ConfigConsoleTest.php

@@ -24,7 +24,7 @@ namespace Friendica\Test\src\Console;
 use Friendica\App;
 use Friendica\App\Mode;
 use Friendica\Console\Config;
-use Friendica\Core\Config\IConfig;
+use Friendica\Core\Config\Capability\IManageConfigValues;
 use Mockery;
 use Mockery\LegacyMockInterface;
 use Mockery\MockInterface;
@@ -35,7 +35,7 @@ class ConfigConsoleTest extends ConsoleTest
 	 * @var App\Mode|MockInterface $appMode
 	 */
 	private $appMode;
-	/** @var IConfig|LegacyMockInterface|MockInterface */
+	/** @var IManageConfigValues|LegacyMockInterface|MockInterface */
 	private $configMock;
 
 	protected function setUp() : void
@@ -52,7 +52,7 @@ class ConfigConsoleTest extends ConsoleTest
 		$this->appMode->shouldReceive('has')
 					  ->andReturn(true);
 
-		$this->configMock = Mockery::mock(IConfig::class);
+		$this->configMock = Mockery::mock(IManageConfigValues::class);
 	}
 
 	public function testSetGetKeyValue()