ReplicatedBagOStuff.php

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<?php
class ReplicatedBagOStuff extends BagOStuff {
    protected $writeStore;
    protected $readStore;

    public function __construct( $params ) {
        parent::__construct( $params );

        if ( !isset( $params['writeFactory'] ) ) {
            throw new InvalidArgumentException(
                __METHOD__ . ': the "writeFactory" parameter is required' );
        }
        if ( !isset( $params['readFactory'] ) ) {
            throw new InvalidArgumentException(
                __METHOD__ . ': the "readFactory" parameter is required' );
        }

        $opts = [ 'reportDupes' => false ]; // redundant
        $this->writeStore = ( $params['writeFactory'] instanceof BagOStuff )
            ? $params['writeFactory']
            : ObjectFactory::getObjectFromSpec( $opts + $params['writeFactory'] );
        $this->readStore = ( $params['readFactory'] instanceof BagOStuff )
            ? $params['readFactory']
            : ObjectFactory::getObjectFromSpec( $opts + $params['readFactory'] );
        $this->attrMap = $this->mergeFlagMaps( [ $this->readStore, $this->writeStore ] );
    }

    public function setDebug( $debug ) {
        $this->writeStore->setDebug( $debug );
        $this->readStore->setDebug( $debug );
    }

    protected function doGet( $key, $flags = 0 ) {
        return ( $flags & self::READ_LATEST )
            ? $this->writeStore->get( $key, $flags )
            : $this->readStore->get( $key, $flags );
    }

    public function getMulti( array $keys, $flags = 0 ) {
        return ( $flags & self::READ_LATEST )
            ? $this->writeStore->getMulti( $keys, $flags )
            : $this->readStore->getMulti( $keys, $flags );
    }

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

    public function delete( $key ) {
        return $this->writeStore->delete( $key );
    }

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

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

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

    public function lock( $key, $timeout = 6, $expiry = 6, $rclass = '' ) {
        return $this->writeStore->lock( $key, $timeout, $expiry, $rclass );
    }

    public function unlock( $key ) {
        return $this->writeStore->unlock( $key );
    }

    public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
        return $this->writeStore->merge( $key, $callback, $exptime, $attempts, $flags );
    }

    public function getLastError() {
        return ( $this->writeStore->getLastError() != self::ERR_NONE )
            ? $this->writeStore->getLastError()
            : $this->readStore->getLastError();
    }

    public function clearLastError() {
        $this->writeStore->clearLastError();
        $this->readStore->clearLastError();
    }
}