eZ\Publish\Core\Persistence\Cache\UrlAliasHandler::lookup PHP Method

    public function lookup($url)
    {
        // Look for url to url alias id cache
        // Replace slashes by "|" to be sure not to mix cache key combinations in underlying lib.
        $cacheKey = $url ?: '/';
        $cache = $this->cache->getItem('urlAlias', 'url', $cacheKey);
        $urlAliasId = $cache->get();
        if ($cache->isMiss()) {
            $urlAliasHistoryCache = $this->cache->getItem('urlAlias', 'url', 'history', $cacheKey);
            $historyUrlAlias = $urlAliasHistoryCache->get();
            if (!$urlAliasHistoryCache->isMiss()) {
                return $historyUrlAlias;
            }
            // Also cache "not found" as this function is heavliy used and hance should be cached
            try {
                $this->logger->logCall(__METHOD__, array('url' => $url));
                $urlAlias = $this->persistenceHandler->urlAliasHandler()->lookup($url);
                if ($urlAlias->isHistory) {
                    $urlAliasHistoryCache->set($urlAlias)->save();
                } else {
                    $cache->set($urlAlias->id)->save();
                    $urlAliasCache = $this->cache->getItem('urlAlias', $urlAlias->id);
                    $urlAliasCache->set($urlAlias)->save();
                }
            } catch (APINotFoundException $e) {
                $cache->set(self::NOT_FOUND)->save();
                throw $e;
            }
        } elseif ($urlAliasId === self::NOT_FOUND) {
            throw new NotFoundException('UrlAlias', $url);
        } else {
            $urlAlias = $this->loadUrlAlias($urlAliasId);
        }
        return $urlAlias;
    }