/**
  * @param \AMQPEnvelope            $envelope
  * @param \AMQPQueue               $queue
  * @param PushPipe                 $pushPipe
  * @param string                   $errorQueue
  * @param ReceiveCancellationToken $cancellationToken
  * @param EndpointControlToken     $endpointControlToken
  *
  * @return bool
  */
 public function process(\AMQPEnvelope $envelope, \AMQPQueue $queue, PushPipe $pushPipe, $errorQueue, ReceiveCancellationToken $cancellationToken, EndpointControlToken $endpointControlToken)
 {
     try {
         $messageId = '';
         $headers = [];
         $pushMessage = false;
         try {
             $messageId = $this->messageConverter->retrieveMessageId($envelope);
             $headers = $this->messageConverter->retrieveHeaders($envelope);
             $pushMessage = true;
         } catch (\Exception $e) {
             $this->routingTopology->sendToQueue($this->brokerModel, $errorQueue, $envelope->getBody(), ['headers' => $envelope->getHeaders()]);
         }
         if ($pushMessage) {
             $pushPipe->push(new PushContext($messageId, $headers, $envelope->getBody() ?: '', $cancellationToken, $endpointControlToken));
         }
         if ($cancellationToken->isCancellationRequested()) {
             $queue->reject($envelope->getDeliveryTag(), AMQP_REQUEUE);
         } else {
             $queue->ack($envelope->getDeliveryTag());
         }
     } catch (CriticalErrorException $e) {
         // just ... die
         throw $e;
     } catch (\Exception $e) {
         $queue->reject($envelope->getDeliveryTag(), AMQP_REQUEUE);
     }
     if ($endpointControlToken->isShutdownRequested()) {
         return false;
     }
     return true;
 }
 /**
  * It requests an endpoint shutdown to take place after the current attempt of processing this message completes,
  * regardless of the way it completes (with success or failure/exception).
  *
  * It effectively pulls out of listening for more messages on the queue.
  */
 public function shutdownThisEndpointAfterCurrentMessage()
 {
     $this->endpointControlToken->requestShutdown();
 }