Spring Cloud Stream Rabbit下发确认

Question

如何在Spring Cloud Stream Rabbit中保证交付。我的代码如下：

class Source {
    MessageChannel output;
    Repository repo;

    @Transactional
    void publisher(Command command){
      repo.save(command);
      output.send(MessageBuilder
                .withPayload(new Event()).build());
    }
}

class Sink {

  @StreamListener(Event.class)
  void eventListener(Event event){
     // method body
  }
}

任何帮助都是非常感谢的。