/**
  * Throws an exception when the store is not available
  *
  * @param GetResponseEvent $event Event
  *
  * @throws ServiceUnavailableHttpException Service not available
  */
 public function handle(GetResponseEvent $event)
 {
     if (!$this->store->isEnabled()) {
         throw new ServiceUnavailableHttpException(null, $this->message);
     }
 }