MultiWriteBagOStuff.php

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<?php

class MultiWriteBagOStuff extends BagOStuff {
        var $caches;

        public function __construct( $params ) {
                if ( !isset( $params['caches'] ) ) {
                        throw new MWException( __METHOD__.': the caches parameter is required' );
                }

                $this->caches = array();
                foreach ( $params['caches'] as $cacheInfo ) {
                        $this->caches[] = ObjectCache::newFromParams( $cacheInfo );
                }
        }

        public function setDebug( $debug ) {
                $this->doWrite( 'setDebug', $debug );
        }

        public function get( $key ) {
                foreach ( $this->caches as $cache ) {
                        $value = $cache->get( $key );
                        if ( $value !== false ) {
                                return $value;
                        }
                }
                return false;
        }

        public function set( $key, $value, $exptime = 0 ) {
                return $this->doWrite( 'set', $key, $value, $exptime );
        }

        public function delete( $key, $time = 0 ) {
                return $this->doWrite( 'delete', $key, $time );
        }

        public function add( $key, $value, $exptime = 0 ) {
                return $this->doWrite( 'add', $key, $value, $exptime );
        }

        public function replace( $key, $value, $exptime = 0 ) {
                return $this->doWrite( 'replace', $key, $value, $exptime );
        }

        public function incr( $key, $value = 1 ) {
                return $this->doWrite( 'incr', $key, $value );
        }

        public function decr( $key, $value = 1 ) {
                return $this->doWrite( 'decr', $key, $value );
        }       

        public function lock( $key, $timeout = 0 ) {
                // Lock only the first cache, to avoid deadlocks
                if ( isset( $this->caches[0] ) ) {
                        return $this->caches[0]->lock( $key, $timeout );
                } else {
                        return true;
                }
        }

        public function unlock( $key ) {
                if ( isset( $this->caches[0] ) ) {
                        return $this->caches[0]->unlock( $key );
                } else {
                        return true;
                }
        }

        protected function doWrite( $method /*, ... */ ) {
                $ret = true;
                $args = func_get_args();
                array_shift( $args );

                foreach ( $this->caches as $cache ) {
                        if ( !call_user_func_array( array( $cache, $method ), $args ) ) {
                                $ret = false;
                        }
                }
                return $ret;
        }

        public function deleteObjectsExpiringBefore( $date, $progressCallback = false ) {
                $ret = false;
                foreach ( $this->caches as $cache ) {
                        if ( $cache->deleteObjectsExpiringBefore( $date, $progressCallback ) ) {
                                $ret = true;
                        }
                }
                return $ret;
        }
}