public function clearPermCacheFor($nodeStr)
    {
        if (!$nodeStr) {
            return;
        }

        if (is_object($nodeStr)) {
            $nodeStr = $this->idStr($nodeStr);
        }

        $key = self::ITEM_PREFIX . $nodeStr;
        $this->getCache()->remove($key);

        $this->clearSourcesCache($nodeStr);
    }