2

@StreamListener对于基于流的服务，我希望当在 a 中调用的底层服务失败时消息保留在队列中。为此，我的理解是，这样做的唯一方法是配置spring.cloud.stream.bindings.channel_name.consumer.acknowledge-mode=MANUAL.

进行此配置更改后，我尝试将@Header(AmqpHeaders.CHANNEL) Channel channel,@Header(AmqpHeaders.DELIVERY_TAG) Long deliveryTag方法参数添加到我现有的@StreamListener实现中，如https://docs.spring.io/spring-integration/reference/html/amqp.html#amqp-inbound-ack中记录的那样。有了这段代码，我遇到了以下异常：

org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException: Listener threw exception
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.wrapToListenerExecutionFailedExceptionIfNeeded(AbstractMessageListenerContainer.java:941)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:851)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:771)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$001(SimpleMessageListenerContainer.java:102)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$1.invokeListener(SimpleMessageListenerContainer.java:198)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1311)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:752)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:1254)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:1224)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$1600(SimpleMessageListenerContainer.java:102)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1470)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.messaging.MessageHandlingException: Missing header 'amqp_channel' for method parameter type [interface com.rabbitmq.client.Channel]
    at org.springframework.messaging.handler.annotation.support.HeaderMethodArgumentResolver.handleMissingValue(HeaderMethodArgumentResolver.java:100)
    at org.springframework.messaging.handler.annotation.support.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:103)
    at org.springframework.messaging.handler.invocation.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:112)

然后我发现了以下内容：https://docs.spring.io/spring-cloud-stream/docs/current/reference/htmlsingle/#_usage_examples，它显示了如何使用 Kafka 执行消息确认的示例，但我是目前使用的是 RabbitMQ 绑定。我们计划最终迁移到 Kafka，但是现在，我如何配置和编写解决方案来为成功处理的消息进行手动消息确认和手动消息拒绝，从而在遇到异常时将消息留在队列中。我目前在 Spring CloudEdgware.RELEASE和 Spring Cloud Stream上Ditmars.RELEASE。

更新

现在我有以下配置：

spring:
  cloud:
    stream:
      bindings:
        do-something-async-reply:
          group: xyz-service-do-something-async-reply
      rabbit:
        bindings:
          do-something-async-reply:
            consumer:
              autoBindDlq: true
              dlqDeadLetterExchange:
              dlqTtl: 10000
              requeueRejected: true

我在服务启动时收到以下错误：

2018-01-12 14:46:34.346 ERROR [xyz-service,,,] 2488 --- [ 127.0.0.1:5672] o.s.a.r.c.CachingConnectionFactory       : Channel shutdown: channel error; protocol method: #method<channel.close>(reply-code=406, reply-text=PRECONDITION_FAILED - inequivalent arg 'x-dead-letter-exchange' for queue 'do-something-async-reply.xyz-service-do-something-async-reply' in vhost '/': received the value 'DLX' of type 'longstr' but current is none, class-id=50, method-id=10)

什么配置错误/我错过了什么？

4

1 回答 1

2

属性名称不正确；你不见了.rabbit。它是

spring.cloud.stream。兔子.bindings。<channel>.consumer.acknowledge-mode=手动

因为这是兔子特有的属性 - 请参阅文档。

编辑

例子：

@SpringBootApplication
@EnableBinding(Sink.class)
public class So481977082Application {

    public static void main(String[] args) {
        SpringApplication.run(So481977082Application.class, args);
    }

    @StreamListener(Sink.INPUT)
    public void in(String in, @Header(AmqpHeaders.CHANNEL) Channel channel,
            @Header(AmqpHeaders.DELIVERY_TAG) long tag) throws Exception {
        System.out.println(in);
        Thread.sleep(60_000);
        channel.basicAck(tag, false);
        System.out.println("Ackd");
    }

}

请记住，对 MANUAL acks 的需求通常是一种气味；通常最好让容器处理ack；请参阅requeueRejected同一个 doco 链接。无条件重新排队可能会导致无限循环。

编辑2

对我来说很好...

@SpringBootApplication
@EnableBinding(Processor.class)
public class So48197708Application {

    public static void main(String[] args) {
        SpringApplication.run(So48197708Application.class, args);
    }

    @Bean
    ApplicationRunner runner(MessageChannel output) {
        return args -> {
            output.send(new GenericMessage<>("foo"));
        };
    }

    @StreamListener(Sink.INPUT)
    public void listen(@Header(name = "x-death", required = false) List<?> death) {
        System.out.println(death);
        throw new RuntimeException("x");
    }

}

和

spring:
  cloud:
    stream:
      bindings:
        input:
          group: foo
          content-type: application/json
          destination: foo
          consumer:
            max-attempts: 1
        output:
          content-type: application/json
          destination: foo
      rabbit:
        bindings:
          input:
            consumer:
              auto-bind-dlq: true
              dlqDeadLetterExchange:
              dlqTtl: 10000

结果：

null
...
Caused by: java.lang.RuntimeException: x
...
[{reason=expired, count=1, exchange=DLX, routing-keys=[foo.foo], time=Fri Jan 12 17:20:28 EST 2018, queue=foo.foo.dlq}, 
    {reason=rejected, count=1, exchange=foo, time=Fri Jan 12 17:20:18 EST 2018, routing-keys=[foo], queue=foo.foo}]
...

...
[{reason=expired, count=3, exchange=DLX, routing-keys=[foo.foo], time=Fri Jan 12 17:20:28 EST 2018, queue=foo.foo.dlq}, 
    {reason=rejected, count=3, exchange=foo, routing-keys=[foo], time=Fri Jan 12 17:20:18 EST 2018, queue=foo.foo}]
于 2018-01-11T01:11:17.090 回答