Config FollowUp

- New Configuration (Config is now only holding the instance)
- New PConfiguration (PConfig is now only holding the instance)

- Config & PConfig-Adapter don't need "ConfigCache" anymore

- DB-Connection is now outside App->reload() for better dependency-chaining

bin/auth_ejabberd.php

@@ -33,7 +33,7 @@
  */
 
 use Friendica\App;
-use Friendica\Core\Config;
+use Friendica\Core\Config\Cache;
 use Friendica\Factory;
 use Friendica\Util\BasePath;
 use Friendica\Util\ExAuth;
@@ -55,8 +55,11 @@ chdir($directory);
 require dirname(__DIR__) . '/vendor/autoload.php';
 
 $basedir = BasePath::create(dirname(__DIR__), $_SERVER);
-$configLoader = new Config\ConfigCacheLoader($basedir);
-$config = Factory\ConfigFactory::createCache($configLoader);
+$configLoader = new Cache\ConfigCacheLoader($basedir);
+$configCache = Factory\ConfigFactory::createCache($configLoader);
+Factory\DBFactory::init($configCache, $_SERVER);
+$config = Factory\ConfigFactory::createConfig($configCache);
+$pconfig = Factory\ConfigFactory::createPConfig($configCache);
 $logger = Factory\LoggerFactory::create('auth_ejabberd', $config);
 $profiler = Factory\ProfilerFactory::create($logger, $config);
 

bin/console.php

@@ -3,13 +3,16 @@
 
 require dirname(__DIR__) . '/vendor/autoload.php';
 
-use Friendica\Core\Config;
+use Friendica\Core\Config\Cache;
 use Friendica\Factory;
 use Friendica\Util\BasePath;
 
 $basedir = BasePath::create(dirname(__DIR__), $_SERVER);
-$configLoader = new Config\ConfigCacheLoader($basedir);
-$config = Factory\ConfigFactory::createCache($configLoader);
+$configLoader = new Cache\ConfigCacheLoader($basedir);
+$configCache = Factory\ConfigFactory::createCache($configLoader);
+Factory\DBFactory::init($configCache, $_SERVER);
+$config = Factory\ConfigFactory::createConfig($configCache);
+$pconfig = Factory\ConfigFactory::createPConfig($configCache);
 $logger = Factory\LoggerFactory::create('console', $config);
 $profiler = Factory\ProfilerFactory::create($logger, $config);
 

bin/daemon.php

@@ -9,6 +9,7 @@
 
 use Friendica\App;
 use Friendica\Core\Config;
+use Friendica\Core\Config\Cache;
 use Friendica\Core\Worker;
 use Friendica\Database\DBA;
 use Friendica\Factory;
@@ -34,8 +35,11 @@ if (!file_exists("boot.php") && (sizeof($_SERVER["argv"]) != 0)) {
 require dirname(__DIR__) . '/vendor/autoload.php';
 
 $basedir = BasePath::create(dirname(__DIR__), $_SERVER);
-$configLoader = new Config\ConfigCacheLoader($basedir);
-$config = Factory\ConfigFactory::createCache($configLoader);
+$configLoader = new Cache\ConfigCacheLoader($basedir);
+$configCache = Factory\ConfigFactory::createCache($configLoader);
+Factory\DBFactory::init($configCache, $_SERVER);
+$config = Factory\ConfigFactory::createConfig($configCache);
+$pconfig = Factory\ConfigFactory::createPConfig($configCache);
 $logger = Factory\LoggerFactory::create('daemon', $config);
 $profiler = Factory\ProfilerFactory::create($logger, $config);
 
@@ -151,7 +155,7 @@ if (!$foreground) {
 	file_put_contents($pidfile, $pid);
 
 	// We lose the database connection upon forking
-	$a->loadDatabase();
+	Factory\DBFactory::init($configCache, $_SERVER);
 }
 
 Config::set('system', 'worker_daemon_mode', true);

bin/worker.php

@@ -7,6 +7,7 @@
 
 use Friendica\App;
 use Friendica\Core\Config;
+use Friendica\Core\Config\Cache;
 use Friendica\Core\Update;
 use Friendica\Core\Worker;
 use Friendica\Factory;
@@ -32,8 +33,11 @@ if (!file_exists("boot.php") && (sizeof($_SERVER["argv"]) != 0)) {
 require dirname(__DIR__) . '/vendor/autoload.php';
 
 $basedir = BasePath::create(dirname(__DIR__), $_SERVER);
-$configLoader = new Config\ConfigCacheLoader($basedir);
-$config = Factory\ConfigFactory::createCache($configLoader);
+$configLoader = new Cache\ConfigCacheLoader($basedir);
+$configCache = Factory\ConfigFactory::createCache($configLoader);
+Factory\DBFactory::init($configCache, $_SERVER);
+$config = Factory\ConfigFactory::createConfig($configCache);
+$pconfig = Factory\ConfigFactory::createPConfig($configCache);
 $logger = Factory\LoggerFactory::create('worker', $config);
 $profiler = Factory\ProfilerFactory::create($logger, $config);
 

index.php

@@ -5,7 +5,7 @@
  */
 
 use Friendica\App;
-use Friendica\Core\Config;
+use Friendica\Core\Config\Cache;
 use Friendica\Factory;
 use Friendica\Util\BasePath;
 
@@ -16,8 +16,11 @@ if (!file_exists(__DIR__ . '/vendor/autoload.php')) {
 require __DIR__ . '/vendor/autoload.php';
 
 $basedir = BasePath::create(__DIR__, $_SERVER);
-$configLoader = new Config\ConfigCacheLoader($basedir);
-$config = Factory\ConfigFactory::createCache($configLoader);
+$configLoader = new Cache\ConfigCacheLoader($basedir);
+$configCache = Factory\ConfigFactory::createCache($configLoader);
+Factory\DBFactory::init($configCache, $_SERVER);
+$config = Factory\ConfigFactory::createConfig($configCache);
+$pconfig = Factory\ConfigFactory::createPConfig($configCache);
 $logger = Factory\LoggerFactory::create('index', $config);
 $profiler = Factory\ProfilerFactory::create($logger, $config);
 

src/App.php

@@ -8,8 +8,9 @@ use Detection\MobileDetect;
 use DOMDocument;
 use DOMXPath;
 use Exception;
-use Friendica\Core\Config\ConfigCache;
-use Friendica\Core\Config\ConfigCacheLoader;
+use Friendica\Core\Config\Cache\ConfigCacheLoader;
+use Friendica\Core\Config\Cache\IConfigCache;
+use Friendica\Core\Config\Configuration;
 use Friendica\Database\DBA;
 use Friendica\Factory\ConfigFactory;
 use Friendica\Network\HTTPException\InternalServerErrorException;
@@ -114,7 +115,7 @@ class App
 	private $logger;
 
 	/**
-	 * @var ConfigCache The cached config
+	 * @var Configuration The config
 	 */
 	private $config;
 
@@ -126,11 +127,11 @@ class App
 	/**
 	 * Returns the current config cache of this node
 	 *
-	 * @return ConfigCache
+	 * @return IConfigCache
 	 */
-	public function getConfig()
+	public function getConfigCache()
 	{
-		return $this->config;
+		return $this->config->getCache();
 	}
 
 	/**
@@ -195,14 +196,14 @@ class App
 	/**
 	 * @brief App constructor.
 	 *
-	 * @param ConfigCache      $config    The Cached Config
+	 * @param Configuration    $config    The Configuration
 	 * @param LoggerInterface  $logger    Logger of this application
 	 * @param Profiler         $profiler  The profiler of this application
 	 * @param bool             $isBackend Whether it is used for backend or frontend (Default true=backend)
 	 *
 	 * @throws Exception if the Basepath is not usable
 	 */
-	public function __construct(ConfigCache $config, LoggerInterface $logger, Profiler $profiler, $isBackend = true)
+	public function __construct(Configuration $config, LoggerInterface $logger, Profiler $profiler, $isBackend = true)
 	{
 		$this->config   = $config;
 		$this->logger   = $logger;
@@ -358,21 +359,11 @@ class App
 	 */
 	public function reload()
 	{
-		Core\Config::init($this->config);
-		Core\PConfig::init($this->config);
-
-		$this->loadDatabase();
-
 		$this->getMode()->determine($this->basePath);
 
 		$this->determineURLPath();
 
 		if ($this->getMode()->has(App\Mode::DBCONFIGAVAILABLE)) {
-			$adapterType = $this->config->get('system', 'config_adapter');
-			$adapter = ConfigFactory::createConfig($adapterType, $this->config);
-			Core\Config::setAdapter($adapter);
-			$adapterP = ConfigFactory::createPConfig($adapterType, $this->config);
-			Core\PConfig::setAdapter($adapterP);
 			Core\Config::load();
 		}
 
@@ -383,7 +374,7 @@ class App
 			Core\Hook::loadHooks();
 			$loader = new ConfigCacheLoader($this->basePath);
 			Core\Hook::callAll('load_config', $loader);
-			$this->config->loadConfigArray($loader->loadCoreConfig('addon'), true);
+			$this->config->getCache()->load($loader->loadCoreConfig('addon'), true);
 		}
 
 		$this->loadDefaultTimezone();
@@ -453,49 +444,6 @@ class App
 		}
 	}
 
-	public function loadDatabase()
-	{
-		if (DBA::connected()) {
-			return;
-		}
-
-		$db_host = $this->config->get('database', 'hostname');
-		$db_user = $this->config->get('database', 'username');
-		$db_pass = $this->config->get('database', 'password');
-		$db_data = $this->config->get('database', 'database');
-		$charset = $this->config->get('database', 'charset');
-
-		// Use environment variables for mysql if they are set beforehand
-		if (!empty(getenv('MYSQL_HOST'))
-			&& !empty(getenv('MYSQL_USERNAME') || !empty(getenv('MYSQL_USER')))
-			&& getenv('MYSQL_PASSWORD') !== false
-			&& !empty(getenv('MYSQL_DATABASE')))
-		{
-			$db_host = getenv('MYSQL_HOST');
-			if (!empty(getenv('MYSQL_PORT'))) {
-				$db_host .= ':' . getenv('MYSQL_PORT');
-			}
-			if (!empty(getenv('MYSQL_USERNAME'))) {
-				$db_user = getenv('MYSQL_USERNAME');
-			} else {
-				$db_user = getenv('MYSQL_USER');
-			}
-			$db_pass = (string) getenv('MYSQL_PASSWORD');
-			$db_data = getenv('MYSQL_DATABASE');
-		}
-
-		$stamp1 = microtime(true);
-
-		if (DBA::connect($this->config, $this->profiler, $db_host, $db_user, $db_pass, $db_data, $charset)) {
-			// Loads DB_UPDATE_VERSION constant
-			Database\DBStructure::definition($this->basePath, false);
-		}
-
-		unset($db_host, $db_user, $db_pass, $db_data, $charset);
-
-		$this->profiler->saveTimestamp($stamp1, 'network', Core\System::callstack());
-	}
-
 	public function getScheme()
 	{
 		return $this->scheme;

src/Core/Config.php

@@ -22,116 +22,76 @@ use Friendica\Core\Config\IConfigCache;
 class Config
 {
 	/**
-	 * @var Config\IConfigAdapter|null
+	 * @var Config\Configuration
 	 */
-	private static $adapter;
+	private static $config;
 
 	/**
-	 * @var Config\IConfigCache
-	 */
-	private static $cache;
-
-	/**
-	 * Initialize the config with only the cache
-	 *
-	 * @param Config\IConfigCache $cache  The configuration cache
-	 */
-	public static function init(Config\IConfigCache $cache)
-	{
-		self::$cache  = $cache;
-	}
-
-	/**
-	 * Add the adapter for DB-backend
+	 * Initialize the config
 	 *
-	 * @param Config\IConfigAdapter $adapter
+	 * @param Config\Configuration $config
 	 */
-	public static function setAdapter(Config\IConfigAdapter $adapter)
+	public static function init(Config\Configuration $config)
 	{
-		self::$adapter = $adapter;
+		self::$config = $config;
 	}
 
 	/**
 	 * @brief Loads all configuration values of family into a cached storage.
 	 *
-	 * All configuration values of the system are stored in the cache ( @see IConfigCache )
-	 *
-	 * @param string $family The category of the configuration value
+	 * @param string $cat The category of the configuration value
 	 *
 	 * @return void
 	 */
-	public static function load($family = "config")
+	public static function load($cat = "config")
 	{
-		if (!isset(self::$adapter) || !self::$adapter->isConnected()) {
-			return;
-		}
-
-		self::$adapter->load($family);
+		self::$config->load($cat);
 	}
 
 	/**
 	 * @brief Get a particular user's config variable given the category name
 	 * ($family) and a key.
 	 *
-	 * Get a particular config value from the given category ($family)
-	 * and the $key from a cached storage either from the self::$adapter
-	 * (@see IConfigAdapter ) or from the static::$cache (@see IConfigCache ).
-	 *
-	 * @param string  $family        The category of the configuration value
+	 * @param string  $cat        The category of the configuration value
 	 * @param string  $key           The configuration key to query
 	 * @param mixed   $default_value optional, The value to return if key is not set (default: null)
 	 * @param boolean $refresh       optional, If true the config is loaded from the db and not from the cache (default: false)
 	 *
 	 * @return mixed Stored value or null if it does not exist
 	 */
-	public static function get($family, $key, $default_value = null, $refresh = false)
+	public static function get($cat, $key, $default_value = null, $refresh = false)
 	{
-		if (!isset(self::$adapter) || !self::$adapter->isConnected()) {
-			return self::$cache->get($family, $key, $default_value);
-		}
-
-		return self::$adapter->get($family, $key, $default_value, $refresh);
+		return self::$config->get($cat, $key, $default_value, $refresh);
 	}
 
 	/**
 	 * @brief Sets a configuration value for system config
 	 *
-	 * Stores a config value ($value) in the category ($family) under the key ($key)
+	 * Stores a config value ($value) in the category ($cat) under the key ($key)
 	 *
 	 * Note: Please do not store booleans - convert to 0/1 integer values!
 	 *
-	 * @param string $family The category of the configuration value
+	 * @param string $cat The category of the configuration value
 	 * @param string $key    The configuration key to set
 	 * @param mixed  $value  The value to store
 	 *
 	 * @return bool Operation success
 	 */
-	public static function set($family, $key, $value)
+	public static function set($cat, $key, $value)
 	{
-		if (!isset(self::$adapter) || !self::$adapter->isConnected()) {
-			return self::$cache->set($family, $key, $value);
-		}
-
-		return self::$adapter->set($family, $key, $value);
+		return self::$config->set($cat, $key, $value);
 	}
 
 	/**
 	 * @brief Deletes the given key from the system configuration.
 	 *
-	 * Removes the configured value from the stored cache in self::$config
-	 * (@see ConfigCache ) and removes it from the database (@see IConfigAdapter ).
-	 *
-	 * @param string $family The category of the configuration value
+	 * @param string $cat The category of the configuration value
 	 * @param string $key    The configuration key to delete
 	 *
-	 * @return mixed
+	 * @return bool
 	 */
-	public static function delete($family, $key)
+	public static function delete($cat, $key)
 	{
-		if (!isset(self::$adapter) || !self::$adapter->isConnected()) {
-			self::$cache->delete($family, $key);
-		}
-
-		return self::$adapter->delete($family, $key);
+		return self::$config->delete($cat, $key);
 	}
 }

src/Core/Config/AbstractDbaConfigAdapter.php → src/Core/Config/Adapter/AbstractDbaConfigAdapter.php

@@ -1,12 +1,19 @@
 <?php
 
-namespace Friendica\Core\Config;
+namespace Friendica\Core\Config\Adapter;
+
+use Friendica\Database\DBA;
 
 abstract class AbstractDbaConfigAdapter
 {
 	/** @var bool */
 	protected $connected = true;
 
+	public function __construct()
+	{
+		$this->connected = DBA::connected();
+	}
+
 	public function isConnected()
 	{
 		return $this->connected;

src/Core/Config/IConfigAdapter.php → src/Core/Config/Adapter/IConfigAdapter.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Friendica\Core\Config;
+namespace Friendica\Core\Config\Adapter;
 
 /**
  *
@@ -13,7 +13,7 @@ interface IConfigAdapter
 	 *
 	 * @param string  $cat The category of the configuration values to load
 	 *
-	 * @return void
+	 * @return array
 	 */
 	public function load($cat = "config");
 
@@ -21,14 +21,12 @@ interface IConfigAdapter
 	 * Get a particular user's config variable given the category name
 	 * ($family) and a key.
 	 *
-	 * @param string  $cat           The category of the configuration value
-	 * @param string  $k             The configuration key to query
-	 * @param mixed   $default_value optional, The value to return if key is not set (default: null)
-	 * @param boolean $refresh       optional, If true the config is loaded from the db and not from the cache (default: false)
+	 * @param string  $cat The category of the configuration value
+	 * @param string  $key The configuration key to query
 	 *
-	 * @return mixed Stored value or null if it does not exist
+	 * @return mixed Stored value or "!<unset>!" if it does not exist
 	 */
-	public function get($cat, $k, $default_value = null, $refresh = false);
+	public function get($cat, $key);
 
 	/**
 	 * Stores a config value ($value) in the category ($family) under the key ($key)
@@ -37,23 +35,23 @@ interface IConfigAdapter
 	 * Note: Please do not store booleans - convert to 0/1 integer values!
 	 *
 	 * @param string $cat   The category of the configuration value
-	 * @param string $k     The configuration key to set
+	 * @param string $key   The configuration key to set
 	 * @param mixed  $value The value to store
 	 *
 	 * @return bool Operation success
 	 */
-	public function set($cat, $k, $value);
+	public function set($cat, $key, $value);
 
 	/**
 	 * Removes the configured value from the stored cache
 	 * and removes it from the database.
 	 *
 	 * @param string $cat The category of the configuration value
-	 * @param string $k   The configuration key to delete
+	 * @param string $key   The configuration key to delete
 	 *
 	 * @return mixed
 	 */
-	public function delete($cat, $k);
+	public function delete($cat, $key);
 
 	/**
 	 * Checks, if the current adapter is connected to the backend

src/Core/Config/IPConfigAdapter.php → src/Core/Config/Adapter/IPConfigAdapter.php

@@ -6,7 +6,7 @@
  * and open the template in the editor.
  */
 
-namespace Friendica\Core\Config;
+namespace Friendica\Core\Config\Adapter;
 
 /**
  *
@@ -20,7 +20,7 @@ interface IPConfigAdapter
 	 * @param string $uid The user_id
 	 * @param string $cat The category of the configuration value
 	 *
-	 * @return void
+	 * @return array
 	 */
 	public function load($uid, $cat);
 
@@ -30,13 +30,11 @@ interface IPConfigAdapter
 	 *
 	 * @param string  $uid           The user_id
 	 * @param string  $cat           The category of the configuration value
-	 * @param string  $k             The configuration key to query
-	 * @param mixed   $default_value optional, The value to return if key is not set (default: null)
-	 * @param boolean $refresh       optional, If true the config is loaded from the db and not from the cache (default: false)
+	 * @param string  $key           The configuration key to query
 	 *
-	 * @return mixed Stored value or null if it does not exist
+	 * @return mixed Stored value or "!<unset>!" if it does not exist
 	 */
-	public function get($uid, $cat, $k, $default_value = null, $refresh = false);
+	public function get($uid, $cat, $key);
 
 	/**
 	 * Stores a config value ($value) in the category ($family) under the key ($key)
@@ -46,12 +44,12 @@ interface IPConfigAdapter
 	 *
 	 * @param string $uid   The user_id
 	 * @param string $cat   The category of the configuration value
-	 * @param string $k     The configuration key to set
+	 * @param string $key   The configuration key to set
 	 * @param string $value The value to store
 	 *
 	 * @return bool Operation success
 	 */
-	public function set($uid, $cat, $k, $value);
+	public function set($uid, $cat, $key, $value);
 
 	/**
 	 * Removes the configured value from the stored cache
@@ -59,9 +57,16 @@ interface IPConfigAdapter
 	 *
 	 * @param string $uid The user_id
 	 * @param string $cat The category of the configuration value
-	 * @param string $k   The configuration key to delete
+	 * @param string $key The configuration key to delete
 	 *
-	 * @return mixed
+	 * @return bool
 	 */
-	public function delete($uid, $cat, $k);
+	public function delete($uid, $cat, $key);
+
+	/**
+	 * Checks, if the current adapter is connected to the backend
+	 *
+	 * @return bool
+	 */
+	public function isConnected();
 }

src/Core/Config/Adapter/JITConfigAdapter.php

@@ -0,0 +1,123 @@
+<?php
+namespace Friendica\Core\Config\Adapter;
+
+use Friendica\Database\DBA;
+
+/**
+ * JustInTime Configuration Adapter
+ *
+ * Default Config Adapter. Provides the best performance for pages loading few configuration variables.
+ *
+ * @author Hypolite Petovan <hypolite@mrpetovan.com>
+ */
+class JITConfigAdapter extends AbstractDbaConfigAdapter implements IConfigAdapter
+{
+	private $in_db;
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function load($cat = "config")
+	{
+		$return = [];
+
+		if (!$this->isConnected()) {
+			return $return;
+		}
+
+		// We don't preload "system" anymore.
+		// This reduces the number of database reads a lot.
+		if ($cat === 'system') {
+			return $return;
+		}
+
+		$configs = DBA::select('config', ['v', 'k'], ['cat' => $cat]);
+		while ($config = DBA::fetch($configs)) {
+			$key = $config['k'];
+
+			$return[$key] = $config['v'];
+			$this->in_db[$cat][$key] = true;
+		}
+		DBA::close($configs);
+
+		return [$cat => $config];
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get($cat, $key)
+	{
+		if (!$this->isConnected()) {
+			return '!<unset>!';
+		}
+
+		$config = DBA::selectFirst('config', ['v'], ['cat' => $cat, 'k' => $key]);
+		if (DBA::isResult($config)) {
+			// manage array value
+			$value = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
+
+			$this->in_db[$cat][$key] = true;
+			return $value;
+		} else {
+
+			$this->in_db[$cat][$key] = false;
+			return '!<unset>!';
+		}
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function set($cat, $key, $value)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		// We store our setting values in a string variable.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$dbvalue = (!is_array($value) ? (string)$value : $value);
+
+		$stored = $this->get($cat, $key);
+
+		if (!isset($this->in_db[$cat])) {
+			$this->in_db[$cat] = [];
+		}
+		if (!isset($this->in_db[$cat][$key])) {
+			$this->in_db[$cat][$key] = false;
+		}
+
+		if (($stored === $dbvalue) && $this->in_db[$cat][$key]) {
+			return true;
+		}
+
+		// manage array value
+		$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
+
+		$result = DBA::update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $key], true);
+
+		$this->in_db[$cat][$key] = $result;
+
+		return $result;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function delete($cat, $key)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		if (isset($this->cache[$cat][$key])) {
+			unset($this->in_db[$cat][$key]);
+		}
+
+		$result = DBA::delete('config', ['cat' => $cat, 'k' => $key]);
+
+		return $result;
+	}
+}

src/Core/Config/Adapter/JITPConfigAdapter.php

@@ -0,0 +1,126 @@
+<?php
+namespace Friendica\Core\Config\Adapter;
+
+use Friendica\Database\DBA;
+
+/**
+ * JustInTime User Configuration Adapter
+ *
+ * Default PConfig Adapter. Provides the best performance for pages loading few configuration variables.
+ *
+ * @author Hypolite Petovan <hypolite@mrpetovan.com>
+ */
+class JITPConfigAdapter extends AbstractDbaConfigAdapter implements IPConfigAdapter
+{
+	private $in_db;
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function load($uid, $cat)
+	{
+		$return = [];
+
+		if (!$this->isConnected()) {
+			return $return;
+		}
+
+		$pconfigs = DBA::select('pconfig', ['v', 'k'], ['cat' => $cat, 'uid' => $uid]);
+		if (DBA::isResult($pconfigs)) {
+			while ($pconfig = DBA::fetch($pconfigs)) {
+				$key = $pconfig['k'];
+
+				$return[$key] = $pconfig['v'];
+
+				$this->in_db[$uid][$cat][$key] = true;
+			}
+		} else if ($cat != 'config') {
+			// Negative caching
+			$return[null] = "!<unset>!";
+		}
+		DBA::close($pconfigs);
+
+		return [$cat => $return];
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get($uid, $cat, $key)
+	{
+		if (!$this->isConnected()) {
+			return null;
+		}
+
+		$pconfig = DBA::selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+		if (DBA::isResult($pconfig)) {
+			// manage array value
+			$value = (preg_match("|^a:[0-9]+:{.*}$|s", $pconfig['v']) ? unserialize($pconfig['v']) : $pconfig['v']);
+
+			$this->in_db[$uid][$cat][$key] = true;
+			return $value;
+		} else {
+
+			$this->in_db[$uid][$cat][$key] = false;
+			return '!<unset>!';
+		}
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function set($uid, $cat, $key, $value)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		// We store our setting values in a string variable.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$dbvalue = (!is_array($value) ? (string)$value : $value);
+
+		$stored = $this->get($uid, $cat, $key);
+
+		if (!isset($this->in_db[$uid])) {
+			$this->in_db[$uid] = [];
+		}
+		if (!isset($this->in_db[$uid][$cat])) {
+			$this->in_db[$uid][$cat] = [];
+		}
+		if (!isset($this->in_db[$uid][$cat][$key])) {
+			$this->in_db[$uid][$cat][$key] = false;
+		}
+
+		if (($stored === $dbvalue) && $this->in_db[$uid][$cat][$key]) {
+			return true;
+		}
+
+		// manage array value
+		$dbvalue = (is_array($value) ? serialize($value) : $dbvalue);
+
+		$result = DBA::update('pconfig', ['v' => $dbvalue], ['uid' => $uid, 'cat' => $cat, 'k' => $key], true);
+
+		$this->in_db[$uid][$cat][$key] = $result;
+
+		return $result;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function delete($uid, $cat, $key)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		if (!empty($this->in_db[$uid][$cat][$key])) {
+			unset($this->in_db[$uid][$cat][$key]);
+		}
+
+		$result = DBA::delete('pconfig', ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+
+		return $result;
+	}
+}

src/Core/Config/Adapter/PreloadConfigAdapter.php

@@ -0,0 +1,104 @@
+<?php
+
+namespace Friendica\Core\Config\Adapter;
+
+use Friendica\Database\DBA;
+
+/**
+ * Preload Configuration Adapter
+ *
+ * Minimizes the number of database queries to retrieve configuration values at the cost of memory.
+ *
+ * @author Hypolite Petovan <hypolite@mrpetovan.com>
+ */
+class PreloadConfigAdapter extends AbstractDbaConfigAdapter implements IConfigAdapter
+{
+	private $config_loaded = false;
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function load($cat = 'config')
+	{
+		$return = [];
+
+		if (!$this->isConnected()) {
+			return $return;
+		}
+
+		if ($this->config_loaded) {
+			return $return;
+		}
+
+		$configs = DBA::select('config', ['cat', 'v', 'k']);
+		while ($config = DBA::fetch($configs)) {
+			$return[$config['k']] = $config['v'];
+		}
+		DBA::close($configs);
+
+		$this->config_loaded = true;
+
+		return [$cat => $return];
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get($cat, $key)
+	{
+		if (!$this->isConnected()) {
+			return null;
+		}
+
+		$config = DBA::selectFirst('config', ['v'], ['cat' => $cat, 'k' => $key]);
+		if (DBA::isResult($config)) {
+			// manage array value
+			$value = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
+
+			return $value;
+		} else {
+
+			return '!<unset>!';
+		}
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function set($cat, $key, $value)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		// We store our setting values as strings.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$compare_value = !is_array($value) ? (string)$value : $value;
+
+		if ($this->get($cat, $key) === $compare_value) {
+			return true;
+		}
+
+		// manage array value
+		$dbvalue = is_array($value) ? serialize($value) : $value;
+
+		$result = DBA::update('config', ['v' => $dbvalue], ['cat' => $cat, 'k' => $key], true);
+
+		return $result;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function delete($cat, $key)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		$result = DBA::delete('config', ['cat' => $cat, 'k' => $key]);
+
+		return $result;
+	}
+}

src/Core/Config/Adapter/PreloadPConfigAdapter.php

@@ -0,0 +1,126 @@
+<?php
+
+namespace Friendica\Core\Config\Adapter;
+
+use Friendica\Database\DBA;
+
+/**
+ * Preload User Configuration Adapter
+ *
+ * Minimizes the number of database queries to retrieve configuration values at the cost of memory.
+ *
+ * @author Hypolite Petovan <hypolite@mrpetovan.com>
+ */
+class PreloadPConfigAdapter extends AbstractDbaConfigAdapter implements IPConfigAdapter
+{
+	private $config_loaded = false;
+
+	/**
+	 * @param int $uid The UID of the current user
+	 */
+	public function __construct($uid = null)
+	{
+		parent::__construct();
+
+		if (isset($uid)) {
+			$this->load($uid, 'config');
+		}
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function load($uid, $cat)
+	{
+		$return = [];
+
+		if ($this->config_loaded) {
+			return $return;
+		}
+
+		if (empty($uid)) {
+			return $return;
+		}
+
+		$pconfigs = DBA::select('pconfig', ['cat', 'v', 'k'], ['uid' => $uid]);
+		while ($pconfig = DBA::fetch($pconfigs)) {
+			$return[$pconfig['k']] = $pconfig['v'];
+		}
+		DBA::close($pconfigs);
+
+		$this->config_loaded = true;
+
+		return [$cat => $return];
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get($uid, $cat, $key)
+	{
+		if (!$this->isConnected()) {
+			return null;
+		}
+
+		if (!$this->config_loaded) {
+			$this->load($uid, $cat);
+		}
+
+		$config = DBA::selectFirst('pconfig', ['v'], ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+		if (DBA::isResult($config)) {
+			// manage array value
+			$value = (preg_match("|^a:[0-9]+:{.*}$|s", $config['v']) ? unserialize($config['v']) : $config['v']);
+
+			return $value;
+		} else {
+			return '!<unset>!';
+		}
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function set($uid, $cat, $key, $value)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		if (!$this->config_loaded) {
+			$this->load($uid, $cat);
+		}
+		// We store our setting values as strings.
+		// So we have to do the conversion here so that the compare below works.
+		// The exception are array values.
+		$compare_value = !is_array($value) ? (string)$value : $value;
+
+		if ($this->get($uid, $cat, $key) === $compare_value) {
+			return true;
+		}
+
+		// manage array value
+		$dbvalue = is_array($value) ? serialize($value) : $value;
+
+		$result = DBA::update('pconfig', ['v' => $dbvalue], ['uid' => $uid, 'cat' => $cat, 'k' => $key], true);
+
+		return $result;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function delete($uid, $cat, $key)
+	{
+		if (!$this->isConnected()) {
+			return false;
+		}
+
+		if (!$this->config_loaded) {
+			$this->load($uid, $cat);
+		}
+
+		$result = DBA::delete('pconfig', ['uid' => $uid, 'cat' => $cat, 'k' => $key]);
+
+		return $result;
+	}
+}

src/Core/Config/ConfigCache.php → src/Core/Config/Cache/ConfigCache.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Friendica\Core\Config;
+namespace Friendica\Core\Config\Cache;
 
 /**
  * The Friendica config cache for the application
@@ -11,6 +11,9 @@ namespace Friendica\Core\Config;
  */
 class ConfigCache implements IConfigCache, IPConfigCache
 {
+	/**
+	 * @var array
+	 */
 	private $config;
 
 	/**
@@ -18,24 +21,28 @@ class ConfigCache implements IConfigCache, IPConfigCache
 	 */
 	public function __construct(array $config = [])
 	{
-		$this->loadConfigArray($config);
+		$this->load($config);
 	}
 
 	/**
-	 * Tries to load the specified configuration array into the App->config array.
-	 * Doesn't overwrite previously set values by default to prevent default config files to supersede DB Config.
-	 *
-	 * @param array $config
-	 * @param bool  $overwrite Force value overwrite if the config key already exists
+	 * {@inheritdoc}
 	 */
-	public function loadConfigArray(array $config, $overwrite = false)
+	public function load(array $config, $overwrite = false)
 	{
-		foreach ($config as $category => $values) {
-			foreach ($values as $key => $value) {
-				if ($overwrite) {
-					$this->set($category, $key, $value);
-				} else {
-					$this->setDefault($category, $key, $value);
+		$categories = array_keys($config);
+
+		foreach ($categories as $category) {
+			if (isset($config[$category]) && is_array($config[$category])) {
+				$keys = array_keys($config[$category]);
+
+				foreach ($keys as $key) {
+					if (isset($config[$category][$key])) {
+						if ($overwrite) {
+							$this->set($category, $key, $config[$category][$key]);
+						} else {
+							$this->setDefault($category, $key, $config[$category][$key]);
+						}
+					}
 				}
 			}
 		}
@@ -44,23 +51,22 @@ class ConfigCache implements IConfigCache, IPConfigCache
 	/**
 	 * {@inheritdoc}
 	 */
-	public function get($cat, $key = null, $default = null)
+	public function get($cat, $key = null)
 	{
-		$return = $default;
-
-		if ($cat === 'config') {
-			if (isset($this->config[$key])) {
-				$return = $this->config[$key];
-			}
+		if (isset($this->config[$cat][$key])) {
+			return $this->config[$cat][$key];
 		} else {
-			if (isset($this->config[$cat][$key])) {
-				$return = $this->config[$cat][$key];
-			} elseif ($key == null && isset($this->config[$cat])) {
-				$return = $this->config[$cat];
-			}
+			return '!<unset>!';
 		}
+	}
 
-		return $return;
+	/**
+	 * {@inheritdoc}
+	 */
+	public function has($cat, $key = null)
+	{
+		return isset($this->config[$cat][$key])
+			&& $this->config[$cat][$key] !== '!<unset>!';
 	}
 
 	/**
@@ -85,52 +91,62 @@ class ConfigCache implements IConfigCache, IPConfigCache
 		// Only arrays are serialized in database, so we have to unserialize sparingly
 		$value = is_string($value) && preg_match("|^a:[0-9]+:{.*}$|s", $value) ? unserialize($value) : $value;
 
-		if ($cat === 'config') {
-			$this->config[$key] = $value;
-		} else {
-			if (!isset($this->config[$cat])) {
-				$this->config[$cat] = [];
-			}
-
-			$this->config[$cat][$key] = $value;
+		if (!isset($this->config[$cat])) {
+			$this->config[$cat] = [];
 		}
 
+		$this->config[$cat][$key] = $value;
+
 		return true;
 	}
 
+	/**
+	 * {@inheritdoc}
+	 */
+	public function hasP($uid, $cat, $key = null)
+	{
+		return isset($this->config[$uid][$cat][$key])
+			&& $this->config[$uid][$cat][$key] !== '!<unset>!';
+	}
+
 	/**
 	 * {@inheritdoc}
 	 */
 	public function delete($cat, $key)
 	{
-		if ($cat === 'config') {
-			if (isset($this->config[$key])) {
-				unset($this->config[$key]);
+		if (isset($this->config[$cat][$key])) {
+			unset($this->config[$cat][$key]);
+			if (count($this->config[$cat]) == 0) {
+				unset($this->config[$cat]);
 			}
+			return true;
 		} else {
-			if (isset($this->config[$cat][$key])) {
-				unset($this->config[$cat][$key]);
-				if (count($this->config[$cat]) == 0) {
-					unset($this->config[$cat]);
-				}
-			}
+			return false;
 		}
 	}
 
 	/**
 	 * {@inheritdoc}
 	 */
-	public function getP($uid, $cat, $key = null, $default = null)
+	public function loadP($uid, array $config)
 	{
-		$return = $default;
+		foreach ($config as $category => $values) {
+			foreach ($values as $key => $value) {
+				$this->setP($uid, $category, $key, $value);
+			}
+		}
+	}
 
+	/**
+	 * {@inheritdoc}
+	 */
+	public function getP($uid, $cat, $key = null)
+	{
 		if (isset($this->config[$uid][$cat][$key])) {
-			$return = $this->config[$uid][$cat][$key];
-		} elseif ($key === null && isset($this->config[$uid][$cat])) {
-			$return = $this->config[$uid][$cat];
+			return $this->config[$uid][$cat][$key];
+		} else {
+			return '!<unset>!';
 		}
-
-		return $return;
 	}
 
 	/**
@@ -145,15 +161,13 @@ class ConfigCache implements IConfigCache, IPConfigCache
 			$this->config[$uid] = [];
 		}
 
-		if (!isset($this->config[$uid][$cat]) || !is_array($this->config[$uid][$cat])) {
+		if (!isset($this->config[$uid][$cat])) {
 			$this->config[$uid][$cat] = [];
 		}
 
-		if ($key === null) {
-			$this->config[$uid][$cat] = $value;
-		} else {
-			$this->config[$uid][$cat][$key] = $value;
-		}
+		$this->config[$uid][$cat][$key] = $value;
+
+		return true;
 	}
 
 	/**
@@ -169,6 +183,10 @@ class ConfigCache implements IConfigCache, IPConfigCache
 					unset($this->config[$uid]);
 				}
 			}
+
+			return true;
+		} else {
+			return false;
 		}
 	}
 

src/Core/Config/ConfigCacheLoader.php → src/Core/Config/Cache/ConfigCacheLoader.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace Friendica\Core\Config;
+namespace Friendica\Core\Config\Cache;
 
 use Friendica\Core\Addon;
 
@@ -40,13 +40,13 @@ class ConfigCacheLoader
 		// Setting at least the basepath we know
 		$config->set('system', 'basepath', $this->baseDir);
 
-		$config->loadConfigArray($this->loadCoreConfig('defaults'));
-		$config->loadConfigArray($this->loadCoreConfig('settings'));
+		$config->load($this->loadCoreConfig('defaults'));
+		$config->load($this->loadCoreConfig('settings'));
 
-		$config->loadConfigArray($this->loadLegacyConfig('htpreconfig'), true);
-		$config->loadConfigArray($this->loadLegacyConfig('htconfig'), true);
+		$config->load($this->loadLegacyConfig('htpreconfig'), true);
+		$config->load($this->loadLegacyConfig('htconfig'), true);
 
-		$config->loadConfigArray($this->loadCoreConfig('local'), true);
+		$config->load($this->loadCoreConfig('local'), true);
 	}
 
 	/**

src/Core/Config/Cache/IConfigCache.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Friendica\Core\Config\Cache;
+
+/**
+ * The interface for a system-wide ConfigCache
+ */
+interface IConfigCache
+{
+	/**
+	 * Tries to load the specified configuration array into the config array.
+	 * Doesn't overwrite previously set values by default to prevent default config files to supersede DB Config.
+	 *
+	 * @param array $config
+	 * @param bool  $overwrite Force value overwrite if the config key already exists
+	 */
+	function load(array $config, $overwrite = false);
+
+	/**
+	 * Gets a value from the config cache.
+	 *
+	 * @param string $cat     Config category
+	 * @param string $key       Config key
+	 *
+	 * @return mixed Returns the value of the Config entry or '!<unset>!' if not set
+	 */
+	function get($cat, $key = null);
+
+	/**
+	 * Sets a value in the config cache. Accepts raw output from the config table
+	 *
+	 * @param string $cat   Config category
+	 * @param string $key   Config key
+	 * @param mixed  $value Value to set
+	 *
+	 * @return bool True, if the value is set
+	 */
+	function set($cat, $key, $value);
+
+	/**
+	 * Deletes a value from the config cache.
+	 *
+	 * @param string $cat  Config category
+	 * @param string $key  Config key
+	 *
+	 * @return bool true, if deleted
+	 */
+	function delete($cat, $key);
+
+	/**
+	 * Checks if a value is set in the config cache.
+	 *
+	 * @param string $cat  Config category
+	 * @param string $key  Config key
+	 * @return bool
+	 */
+	function has($cat, $key = null);
+
+	/**
+	 * Returns the whole configuration cache
+	 *
+	 * @return array
+	 */
+	function getAll();
+}

src/Core/Config/Cache/IPConfigCache.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Friendica\Core\Config\Cache;
+
+/**
+ * The interface for a user-specific config cache
+ */
+interface IPConfigCache
+{
+	/**
+	 * Tries to load the specified configuration array into the user specific config array.
+	 * Doesn't overwrite previously set values by default to prevent default config files to supersede DB Config.
+	 *
+	 * @param int   $uid
+	 * @param array $config
+	 */
+	function loadP($uid, array $config);
+
+	/**
+	 * Retrieves a value from the user config cache
+	 *
+	 * @param int    $uid     User Id
+	 * @param string $cat     Config category
+	 * @param string $key     Config key
+	 *
+	 * @return string The value of the config entry or '!<unset>!' if not set
+	 */
+	function getP($uid, $cat, $key = null);
+
+	/**
+	 * Sets a value in the user config cache
+	 *
+	 * Accepts raw output from the pconfig table
+	 *
+	 * @param int    $uid   User Id
+	 * @param string $cat   Config category
+	 * @param string $key   Config key
+	 * @param mixed  $value Value to set
+	 */
+	function setP($uid, $cat, $key, $value);
+
+	/**
+	 * Deletes a value from the user config cache
+	 *
+	 * @param int    $uid User Id
+	 * @param string $cat Config category
+	 * @param string $key Config key
+	 *
+	 * @return bool true, if deleted
+	 */
+	function deleteP($uid, $cat, $key);
+
+
+	/**
+	 * Checks if a value is set in the user config cache.
+	 *
+	 * @param int    $uid  User Id
+	 * @param string $cat  Config category
+	 * @param string $key  Config key
+	 * @return bool
+	 */
+	function hasP($uid, $cat, $key = null);
+
+	/**
+	 * Returns the whole configuration cache
+	 *
+	 * @return array
+	 */
+	function getAll();
+}

src/Core/Config/Configuration.php

@@ -0,0 +1,154 @@
+<?php
+
+namespace Friendica\Core\Config;
+
+/**
+ * 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 Cache\IConfigCache )
+ * - The Config-DB-Table (per Config-DB-adapter @see Adapter\IConfigAdapter )
+ */
+class Configuration
+{
+	/**
+	 * @var Cache\IConfigCache
+	 */
+	private $configCache;
+
+	/**
+	 * @var Adapter\IConfigAdapter
+	 */
+	private $configAdapter;
+
+	/**
+	 * @param Cache\IConfigCache     $configCache   The configuration cache (based on the config-files)
+	 * @param Adapter\IConfigAdapter $configAdapter The configuration DB-backend
+	 */
+	public function __construct(Cache\IConfigCache $configCache, Adapter\IConfigAdapter $configAdapter)
+	{
+		$this->configCache = $configCache;
+		$this->configAdapter = $configAdapter;
+
+		$this->load();
+	}
+
+	/**
+	 * Returns the Config Cache
+	 *
+	 * @return Cache\IConfigCache
+	 */
+	public function getCache()
+	{
+		return $this->configCache;
+	}
+
+	/**
+	 * @brief Loads all configuration values of family into a cached storage.
+	 *
+	 * All configuration values of the system are stored in the cache ( @see IConfigCache )
+	 *
+	 * @param string $cat The category of the configuration value
+	 *
+	 * @return void
+	 */
+	public function load($cat = 'config')
+	{
+		// If not connected, do nothing
+		if (!$this->configAdapter->isConnected()) {
+			return;
+		}
+
+		// load the whole category out of the DB into the cache
+		$this->configCache->load($this->configAdapter->load($cat), true);
+	}
+
+	/**
+	 * @brief Get a particular user's config variable given the category name
+	 * ($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 IConfigCache ).
+	 *
+	 * @param string  $cat        The category of the configuration value
+	 * @param string  $key           The configuration key to query
+	 * @param mixed   $default_value optional, The value to return if key is not set (default: null)
+	 * @param boolean $refresh       optional, If true the config is loaded from the db and not from the cache (default: false)
+	 *
+	 * @return mixed Stored value or null if it does not exist
+	 */
+	public function get($cat, $key, $default_value = null, $refresh = false)
+	{
+		// Return the value of the cache if found and no refresh is forced
+		if (!$refresh && $this->configCache->has($cat, $key)) {
+			return $this->configCache->get($cat, $key);
+		}
+
+		// if we don't find the value in the cache and the adapter isn't ready, return the default value
+		if (!$this->configAdapter->isConnected()) {
+			return $default_value;
+		}
+
+		// load DB value to cache
+		$dbvalue = $this->configAdapter->get($cat, $key);
+
+		if ($dbvalue !== '!<unset>!') {
+			$this->configCache->set($cat, $key, $dbvalue);
+			return $dbvalue;
+		} else {
+			return $default_value;
+		}
+	}
+
+	/**
+	 * @brief Sets a configuration value for system config