Symfony\Bundle\DoctrineMongoDBBundle\DependencyInjection\DoctrineMongoDBExtension::loadDocumentManagerMetadataCacheDriver PHP Method

    protected function loadDocumentManagerMetadataCacheDriver(array $documentManager, ContainerBuilder $container)
    {
        $metadataCacheDriver = $container->getParameter('doctrine.odm.mongodb.metadata_cache_driver');
        $dmMetadataCacheDriver = isset($documentManager['metadata_cache_driver']) ? $documentManager['metadata_cache_driver'] : $metadataCacheDriver;
        $type = is_array($dmMetadataCacheDriver) && isset($dmMetadataCacheDriver['type']) ? $dmMetadataCacheDriver['type'] : $dmMetadataCacheDriver;

        if ($type === 'memcache') {
            $memcacheClass = isset($dmMetadataCacheDriver['class']) ? $dmMetadataCacheDriver['class'] : sprintf('%%doctrine.odm.mongodb.cache.%s_class%%', $type);
            $cacheDef = new Definition($memcacheClass);
            $memcacheHost = isset($dmMetadataCacheDriver['host']) ? $dmMetadataCacheDriver['host'] : '%doctrine.odm.mongodb.cache.memcache_host%';
            $memcachePort = isset($dmMetadataCacheDriver['port']) ? $dmMetadataCacheDriver['port'] : '%doctrine.odm.mongodb.cache.memcache_port%';
            $memcacheInstanceClass = isset($dmMetadataCacheDriver['instance_class']) ? $dmMetadataCacheDriver['instance_class'] : '%doctrine.odm.mongodb.cache.memcache_instance_class%';
            $memcacheInstance = new Definition($memcacheInstanceClass);
            $memcacheInstance->addMethodCall('connect', array($memcacheHost, $memcachePort));
            $container->setDefinition(sprintf('doctrine.odm.mongodb.%s_memcache_instance', $documentManager['name']), $memcacheInstance);
            $cacheDef->addMethodCall('setMemcache', array(new Reference(sprintf('doctrine.odm.mongodb.%s_memcache_instance', $documentManager['name']))));
        } else {
             $cacheDef = new Definition(sprintf('%%doctrine.odm.mongodb.cache.%s_class%%', $type));
        }
        $container->setDefinition(sprintf('doctrine.odm.mongodb.%s_metadata_cache', $documentManager['name']), $cacheDef);
    }