code: protected function getExchangeServiceId(AMQPAwareMessage $message)
      {
          return sprintf(
              BoekkooiAMQPExtension::SERVICE_VHOST_EXCHANGE_ID,
              $message->getVHost(),
              $message->getExchange()
          );
      }
docs: Get the exchange DI container id for a @see AMQPAwareMessage instance.
  
  @param AMQPAwareMessage $message
  @return string