Spring RabbitMQ - 在具有 @RabbitListener 配置的服务上使用手动通道确认

Question

如何在不使用自动确认的情况下手动确认消息。 有没有办法将它与@RabbitListener 和@EnableRabbit 配置样式一起使用。 大多数文档告诉我们使用SimpleMessageListenerContainer 和ChannelAwareMessageListener。 然而，使用它我们失去了注释提供的灵活性。 我的服务配置如下：

@Service
public class EventReceiver {

@Autowired
private MessageSender messageSender;

@RabbitListener(queues = "${eventqueue}")
public void receiveMessage(Order order) throws Exception {

  // code for processing order
}

---

我的 RabbitConfiguration 如下

@EnableRabbit
public class RabbitApplication implements RabbitListenerConfigurer {

public static void main(String[] args) {
    SpringApplication.run(RabbitApplication.class, args);
}

@Bean


public MappingJackson2MessageConverter jackson2Converter() {
        MappingJackson2MessageConverter converter = new  MappingJackson2MessageConverter();
        return converter;
    @Bean
public SimpleRabbitListenerContainerFactory myRabbitListenerContainerFactory() {
      SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
      factory.setConnectionFactory(rabbitConnectionFactory());
      factory.setMaxConcurrentConsumers(5);
      factory.setMessageConverter((MessageConverter) jackson2Converter());
      factory.setAcknowledgeMode(AcknowledgeMode.MANUAL);
      return factory;
    }

@Bean
public ConnectionFactory rabbitConnectionFactory() {
    CachingConnectionFactory connectionFactory = new CachingConnectionFactory();
    connectionFactory.setHost("localhost");
    return connectionFactory;
}

@Override
public void configureRabbitListeners(RabbitListenerEndpointRegistrar registrar) {
    registrar.setContainerFactory(myRabbitListenerContainerFactory());
}

@Autowired
private EventReceiver receiver;
}
}

对于如何适应手动通道确认以及上述配置样式的任何帮助，我们将不胜感激。 如果我们实现 ChannelAwareMessageListener，那么 onMessage 签名将会改变。 我们可以在服务上实现 ChannelAwareMessageListener 吗？

Answer 1

将Channel 添加到@RabbitListener 方法...

@RabbitListener(queues = "${eventqueue}")
public void receiveMessage(Order order, Channel channel,
    @Header(AmqpHeaders.DELIVERY_TAG) long tag) throws Exception {
    ...
}

并使用basicAck、basicReject中的标签。

编辑

@SpringBootApplication
@EnableRabbit
public class So38728668Application {

    public static void main(String[] args) throws Exception {
        ConfigurableApplicationContext context = SpringApplication.run(So38728668Application.class, args);
        context.getBean(RabbitTemplate.class).convertAndSend("", "so38728668", "foo");
        context.getBean(Listener.class).latch.await(60, TimeUnit.SECONDS);
        context.close();
    }

    @Bean
    public Queue so38728668() {
        return new Queue("so38728668");
    }

    @Bean
    public Listener listener() {
        return new Listener();
    }

    public static class Listener {

        private final CountDownLatch latch = new CountDownLatch(1);

        @RabbitListener(queues = "so38728668")
        public void receive(String payload, Channel channel, @Header(AmqpHeaders.DELIVERY_TAG) long tag)
                throws IOException {
            System.out.println(payload);
            channel.basicAck(tag, false);
            latch.countDown();
        }

    }

}

application.properties：

spring.rabbitmq.listener.acknowledge-mode=manual

Answer 2

以防万一您需要使用 ChannelAwareMessageListener 类中的#onMessage()。那你就可以这样了。

@Component
public class MyMessageListener implements ChannelAwareMessageListener {

    @Override
    public void onMessage(Message message, Channel channel) {
        log.info("Message received.");
        // do something with the message
        channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);
    }
}

对于rabbit的配置

@Configuration
public class RabbitConfig {

    public static final String topicExchangeName = "exchange1";

    public static final String queueName = "queue1";

    public static final String routingKey = "queue1.route.#";

    @Bean
    public ConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory("localhost");
        connectionFactory.setUsername("xxxx");
        connectionFactory.setPassword("xxxxxxxxxx");
        connectionFactory.setPort(5672);
        connectionFactory.setVirtualHost("vHost1");
        return connectionFactory;
    }

    @Bean
    public RabbitTemplate rabbitTemplate() {
        return new RabbitTemplate(connectionFactory());
    }

    @Bean
    Queue queue() {
        return new Queue(queueName, true);
    }

    @Bean
    TopicExchange exchange() {
        return new TopicExchange(topicExchangeName);
    }

    @Bean
    Binding binding(Queue queue, TopicExchange exchange) {
        return BindingBuilder.bind(queue).to(exchange).with(routingKey);
    }


    @Bean
    public SimpleMessageListenerContainer listenerContainer(MyMessageListener myRabbitMessageListener) {
        SimpleMessageListenerContainer listenerContainer = new SimpleMessageListenerContainer();
        listenerContainer.setConnectionFactory(connectionFactory());
        listenerContainer.setQueueNames(queueName);
        listenerContainer.setMessageListener(myRabbitMessageListener);
        listenerContainer.setAcknowledgeMode(AcknowledgeMode.MANUAL);
        listenerContainer.setConcurrency("4");
        listenerContainer.setPrefetchCount(20);
        return listenerContainer;
    }
}

Answer 3

感谢加里的帮助。我终于解决了这个问题。为了他人的利益，我正在记录这一点。 这需要作为标准文档的一部分记录在 Spring AMQP 参考文档页面中。 服务等级如下。

   @Service
    public class Consumer {

    @RabbitListener(queues = "${eventqueue}")
    public void receiveMessage(Order order, Channel channel) throws Exception {



 // the above methodname can be anything but should have channel as second signature

    channel.basicConsume(eventQueue, false, channel.getDefaultConsumer()); 
    // Get the delivery tag
    long deliveryTag = channel.basicGet(eventQueue, false).getEnvelope().getDeliveryTag();
    try {

      // code for processing order

    catch(Exception) {
     // handle exception
        channel.basicReject(deliveryTag, true);
    }
    // If all logic is successful 
    channel.basicAck(deliveryTag, false);
}

---

配置也做了如下修改

public class RabbitApplication implements RabbitListenerConfigurer {

    private static final Logger log = LoggerFactory.getLogger(RabbitApplication .class);

    public static void main(String[] args) {
        SpringApplication.run(RabbitApplication.class, args);
    }

    @Bean
    public MappingJackson2MessageConverter jackson2Converter() {
        MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter();
        return converter;
    }

    @Bean
    public DefaultMessageHandlerMethodFactory myHandlerMethodFactory() {
        DefaultMessageHandlerMethodFactory factory = new DefaultMessageHandlerMethodFactory();
        factory.setMessageConverter(jackson2Converter());
        return factory;
    }

    @Autowired
    private Consumer consumer;

    @Override
    public void configureRabbitListeners(RabbitListenerEndpointRegistrar registrar) {
        registrar.setMessageHandlerMethodFactory(myHandlerMethodFactory());
    }

      ...
}

注意：不需要配置 Rabbitconnectionfactory 或 containerfactor 等，因为注解会隐式处理所有这些。