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<?php |
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/** |
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* @package midcom.services |
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* @author The Midgard Project, http://www.midgard-project.org |
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* @copyright The Midgard Project, http://www.midgard-project.org |
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* @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License |
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*/ |
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use Doctrine\Common\Cache; |
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use Doctrine\Common\Cache\CacheProvider; |
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/** |
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* This is the base class for the MidCOM cache modules. It provides a basic infrastructure |
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* for building your own caching service, providing hooks for initialization. |
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* |
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* It provides convenience methods to start up the cache module, for example for the creation |
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* of a cache backend instance. There is no specific initialization done during startup, to |
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* allow the modules to do their own magic during startup (it is difficult to generalize such |
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* stuff). |
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* |
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* @package midcom.services |
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*/ |
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abstract class midcom_services_cache_module |
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{ |
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/** |
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* A list of all backends created by _create_backend(). They will be automatically |
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* shut down when the module shuts down. They are indexed by their name. |
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* |
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* @var Doctrine\Common\Cache\CacheProvider[] |
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*/ |
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protected $_backends = []; |
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/** |
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* The cache key prefix. |
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* |
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* @var string |
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*/ |
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protected $_prefix; |
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/** |
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* Initialize the module. This will initialize the class configuration |
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* and call the corresponding event handler. |
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*/ |
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public function __construct() |
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{ |
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$this->_prefix = get_class($this) . $_SERVER['SERVER_NAME']; |
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} |
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/** |
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* Creates an instance of the handler described by the configuration passed to |
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* the function. |
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* |
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* The configuration array must include the configuration parameters driver and |
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* directory, as outlined in the midcom_services_cache_backend class documentation. |
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* |
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* All backends will be collected in the $_backends array, indexed by their name. |
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* |
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* Any duplicate instantiation will be intercepted, throwing a critical error. |
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* |
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* @param string $name The name of the backend, must be unique throughout the system. |
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* @param array $config The configuration of the backend to create. It must contain |
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* the key 'driver', which indicates which backend to use. |
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*/ |
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protected function _create_backend($name, array $config) : CacheProvider |
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{ |
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$name = $this->_prefix . $name; |
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if (array_key_exists($name, $this->_backends)) { |
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throw new midcom_error("Cannot create backend driver instance {$name}: A backend with this name does already exist."); |
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} |
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if (!array_key_exists('driver', $config)) { |
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throw new midcom_error("Cannot create backend driver instance {$name}: The driver class is not specified in the configuration."); |
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} |
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if (is_string($config['driver'])) { |
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$backend = $this->prepare_backend($config, $name); |
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} else { |
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$backend = $config['driver']; |
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} |
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$backend->setNamespace($name); |
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$this->_backends[$name] = $backend; |
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return $backend; |
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} |
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private function prepare_backend(array $config, string $name) : CacheProvider |
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{ |
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$directory = midcom::get()->getCacheDir(); |
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if (!empty($config['directory'])) { |
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$directory .= '/' . $config['directory']; |
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} |
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switch ($config['driver']) { |
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case 'apc': |
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$backend = new Cache\ApcuCache(); |
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break; |
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case 'memcached': |
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if ($memcached = self::prepare_memcached($config)) { |
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$backend = new Cache\MemcachedCache(); |
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$backend->setMemcached($memcached); |
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break; |
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} |
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debug_add("memcache: Failed to connect. Falling back to filecache", MIDCOM_LOG_ERROR); |
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// fall-through |
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case 'dba': |
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case 'flatfile': |
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$backend = new Cache\FilesystemCache($directory . '/' . $name); |
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break; |
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case 'sqlite': |
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$sqlite = new SQLite3("{$directory}/{$name}.db"); |
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$table = str_replace(['.', '-'], '_', $name); |
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$backend = new Cache\SQLite3Cache($sqlite, $table); |
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break; |
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case 'null': |
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default: |
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$backend = new Cache\VoidCache(); |
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break; |
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} |
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$cache = new Cache\ChainCache([new Cache\ArrayCache, $backend]); |
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return $cache; |
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} |
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public static function prepare_memcached(array $config) : ?Memcached |
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{ |
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$host = $config['host'] ?? 'localhost'; |
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$port = $config['port'] ?? 11211; |
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$memcached = new Memcached; |
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if (!$memcached->addServer($host, $port)) { |
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midcom::get()->debug->log_php_error(MIDCOM_LOG_ERROR); |
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return null; |
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} |
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return $memcached; |
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} |
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/** |
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* Invalidate the cache completely, dropping all entries. The default implementation will |
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* drop all entries from all registered cache backends using CacheProvider::flushAll(). |
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* Override this function if this behavior doesn't suit your needs. |
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*/ |
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public function invalidate_all() |
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{ |
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foreach ($this->_backends as $name => $backend) { |
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debug_add("Invalidating cache backend {$name}...", MIDCOM_LOG_INFO); |
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$backend->flushAll(); |
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} |
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} |
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/** |
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* Invalidate all cache objects related to the given GUID. |
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* |
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* @param string $guid The GUID that has to be invalidated. |
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* @param object $object The object that has to be invalidated (if available). |
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*/ |
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abstract public function invalidate($guid, $object = null); |
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} |
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flack /
openpsa
