/**
  * Check whether given descriptor is active
  *
  * @param RequestDescriptor $descriptor
  *
  * @return bool
  */
 private function isDescriptorActive(RequestDescriptor $descriptor)
 {
     $meta = $descriptor->getMetadata();
     return !$meta[RequestExecutorInterface::META_REQUEST_COMPLETE] && $descriptor->isRunning() && !$descriptor->isPostponed();
 }