private function getMinMaxWamIndexDateInternal() { $wamDates = WikiaDataAccess::cache(wfSharedMemcKey('wam_minmax_date', WAMService::MEMCACHE_VER), 2 * 60 * 60, function () { $wamService = new WAMService(); return $wamService->getWamIndexDates(); }); return $wamDates; }