public static function initialize()
    {
        if (self::$registered) {
            return true;
        }

        try {
            // initialize the connection to memcached
            if (is_null(self::cache())) {
                return false;
            }
            // register the wrapper
            stream_wrapper_register(self::PROTOCOL, 'Shpasser\GaeSupportL5\Storage\CacheFs');
            self::$registered = true;
        } catch (\RuntimeException $ex) {
            return false;
        }

        return true;
    }