friendica_2020-09-1_sharedHosting/src/Factory/CacheFactory.php

<?php
/**
 * @copyright Copyright (C) 2020, Friendica
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

namespace Friendica\Factory;

use Friendica\App\BaseURL;
use Friendica\Core\Cache;
use Friendica\Core\Cache\ICache;
use Friendica\Core\Config\IConfig;
use Friendica\Database\Database;
use Friendica\Util\Profiler;
use Psr\Log\LoggerInterface;

/**
 * Class CacheFactory
 *
 * @package Friendica\Core\Cache
 *
 * A basic class to generate a CacheDriver
 */
class CacheFactory
{
	/**
	 * @var string The default cache if nothing set
	 */
	const DEFAULT_TYPE = Cache\Type::DATABASE;

	/**
	 * @var IConfig The IConfiguration to read parameters out of the config
	 */
	private $config;

	/**
	 * @var Database The database connection in case that the cache is used the dba connection
	 */
	private $dba;

	/**
	 * @var string The hostname, used as Prefix for Caching
	 */
	private $hostname;

	/**
	 * @var Profiler The optional profiler if the cached should be profiled
	 */
	private $profiler;

	/**
	 * @var LoggerInterface The Friendica Logger
	 */
	private $logger;

	public function __construct(BaseURL $baseURL, IConfig $config, Database $dba, Profiler $profiler, LoggerInterface $logger)
	{
		$this->hostname = $baseURL->getHostname();
		$this->config   = $config;
		$this->dba      = $dba;
		$this->profiler = $profiler;
		$this->logger   = $logger;
	}

	/**
	 * This method creates a CacheDriver for the given cache driver name
	 *
	 * @param string $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
	 */
	public function create(string $type = null)
	{
		if (empty($type)) {
			$type = $this->config->get('system', 'cache_driver', self::DEFAULT_TYPE);
		}

		switch ($type) {
			case Cache\Type::MEMCACHE:
				$cache = new Cache\MemcacheCache($this->hostname, $this->config);
				break;
			case Cache\Type::MEMCACHED:
				$cache = new Cache\MemcachedCache($this->hostname, $this->config, $this->logger);
				break;
			case Cache\Type::REDIS:
				$cache = new Cache\RedisCache($this->hostname, $this->config);
				break;
			case Cache\Type::APCU:
				$cache = new Cache\APCuCache($this->hostname);
				break;
			default:
				$cache = new Cache\DatabaseCache($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) && $profiling !== false) {
			return new Cache\ProfilerCache($cache, $this->profiler);
		} else {
			return $cache;
		}
	}
}