protected function filterActiveAppServers($appServerList)
    {
        $activeServerList = [];
        /** @var \OxidEsales\Eshop\Core\DataObject\ApplicationServer $server */
        foreach ($appServerList as $server) {
            if ($server->isInUse($this->currentTime)) {
                $activeServerList[$server->getId()] = $server;
            }
        }
        return $activeServerList;
    }