function saveMemoryCachingState($id, $group = 'default')
    {
        if ($this->_caching) {
            $array = array(
                'counter' => $this->_memoryCachingCounter,
                'array' => $this->_memoryCachingArray
            );
            $data = serialize($array);
            $this->save($data, $id, $group);
        }
    }