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Diffstat (limited to 'includes/filebackend/lockmanager/LockManagerGroup.php')
-rw-r--r-- | includes/filebackend/lockmanager/LockManagerGroup.php | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/includes/filebackend/lockmanager/LockManagerGroup.php b/includes/filebackend/lockmanager/LockManagerGroup.php new file mode 100644 index 00000000..8c8c940a --- /dev/null +++ b/includes/filebackend/lockmanager/LockManagerGroup.php @@ -0,0 +1,143 @@ +<?php +/** + * Lock manager registration handling. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * http://www.gnu.org/copyleft/gpl.html + * + * @file + * @ingroup LockManager + */ + +/** + * Class to handle file lock manager registration + * + * @ingroup LockManager + * @author Aaron Schulz + * @since 1.19 + */ +class LockManagerGroup { + /** + * @var LockManagerGroup + */ + protected static $instance = null; + + /** @var Array of (name => ('class' =>, 'config' =>, 'instance' =>)) */ + protected $managers = array(); + + protected function __construct() {} + + /** + * @return LockManagerGroup + */ + public static function singleton() { + if ( self::$instance == null ) { + self::$instance = new self(); + self::$instance->initFromGlobals(); + } + return self::$instance; + } + + /** + * Destroy the singleton instance, so that a new one will be created next + * time singleton() is called. + */ + public static function destroySingleton() { + self::$instance = null; + } + + /** + * Register lock managers from the global variables + * + * @return void + */ + protected function initFromGlobals() { + global $wgLockManagers; + + $this->register( $wgLockManagers ); + } + + /** + * Register an array of file lock manager configurations + * + * @param $configs Array + * @return void + * @throws MWException + */ + protected function register( array $configs ) { + foreach ( $configs as $config ) { + if ( !isset( $config['name'] ) ) { + throw new MWException( "Cannot register a lock manager with no name." ); + } + $name = $config['name']; + if ( !isset( $config['class'] ) ) { + throw new MWException( "Cannot register lock manager `{$name}` with no class." ); + } + $class = $config['class']; + unset( $config['class'] ); // lock manager won't need this + $this->managers[$name] = array( + 'class' => $class, + 'config' => $config, + 'instance' => null + ); + } + } + + /** + * Get the lock manager object with a given name + * + * @param $name string + * @return LockManager + * @throws MWException + */ + public function get( $name ) { + if ( !isset( $this->managers[$name] ) ) { + throw new MWException( "No lock manager defined with the name `$name`." ); + } + // Lazy-load the actual lock manager instance + if ( !isset( $this->managers[$name]['instance'] ) ) { + $class = $this->managers[$name]['class']; + $config = $this->managers[$name]['config']; + $this->managers[$name]['instance'] = new $class( $config ); + } + return $this->managers[$name]['instance']; + } + + /** + * Get the default lock manager configured for the site. + * Returns NullLockManager if no lock manager could be found. + * + * @return LockManager + */ + public function getDefault() { + return isset( $this->managers['default'] ) + ? $this->get( 'default' ) + : new NullLockManager( array() ); + } + + /** + * Get the default lock manager configured for the site + * or at least some other effective configured lock manager. + * Throws an exception if no lock manager could be found. + * + * @return LockManager + * @throws MWException + */ + public function getAny() { + return isset( $this->managers['default'] ) + ? $this->get( 'default' ) + : $this->get( 'fsLockManager' ); + } +} |