LockManagerGroup.php

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<?php
class LockManagerGroup {
        protected static $instance = null;

        protected $managers = array();

        protected function __construct() {}

        public static function singleton() {
                if ( self::$instance == null ) {
                        self::$instance = new self();
                        self::$instance->initFromGlobals();
                }
                return self::$instance;
        }

        public static function destroySingleton() {
                self::$instance = null;
        }

        protected function initFromGlobals() {
                global $wgLockManagers;

                $this->register( $wgLockManagers );
        }

        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
                        );
                }
        }

        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'];
        }

        public function getDefault() {
                return isset( $this->managers['default'] )
                        ? $this->get( 'default' )
                        : new NullLockManager( array() );
        }

        public function getAny() {
                return isset( $this->managers['default'] )
                        ? $this->get( 'default' )
                        : $this->get( 'fsLockManager' );
        }
}