public function clean(\Zend_EventManager_EventDescription $event)
    {      
        $params = $event->getParams();
        $mode = \Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG;

        if (isset($params['mode'])) {
            $mode = $params['mode'];   
        }

        return $this->cache->clean($mode, $this->_getTags($event));
    }