MultiWriteBagOStuff.php

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<?php
class MultiWriteBagOStuff extends BagOStuff {
    protected $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( $key, &$casToken = null ) {
        foreach ( $this->caches as $cache ) {
            $value = $cache->get( $key );
            if ( $value !== false ) {
                return $value;
            }
        }
        return false;
    }

    public function cas( $casToken, $key, $value, $exptime = 0 ) {
        throw new MWException( "CAS is not implemented in " . __CLASS__ );
    }

    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 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;
        }
    }

    public function merge( $key, Closure $callback, $exptime = 0, $attempts = 10 ) {
        return $this->doWrite( 'merge', $key, $callback, $exptime );
    }

    public function getLastError() {
        return isset( $this->caches[0] ) ? $this->caches[0]->getLastError() : self::ERR_NONE;
    }

    public function clearLastError() {
        if ( isset( $this->caches[0] ) ) {
            $this->caches[0]->clearLastError();
        }
    }

    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;
    }
}