Spring Cloud Stream：@StreamListener 处理消息两次

Question

我正在使用 Spring Cloud Stream (Edgware.SR5) 和 Spring Boot (1.5.10.RELEASE)。我的@StreamListener 每收到一条消息都会处理两次。

该示例的想法是在队列中发布消息并对其进行处理。

服务：

@EnableBinding(ExampleBindings.class)
@Service
public class ExampleService {

    @Publisher(channel = ExampleBindings.OUTPUT)
    public String queue(String message){
        return message;
    }

    @StreamListener(ExampleBindings.INPUT)
    public void dequeue(String message){
        System.out.println("New message: " + message);
    }
}

绑定：

public interface ExampleBindings {

    String INPUT = "input1";
    String OUTPUT = "output1";

    @Input(ExampleBindings.INPUT)
    SubscribableChannel input();

    @Output(ExampleBindings.OUTPUT)
    MessageChannel output();
}

application.properties：

spring.cloud.stream.default.group=group1
spring.cloud.stream.default.binder=binder1

spring.cloud.stream.bindings.input1.destination=dest_1
spring.cloud.stream.bindings.output1.destination=dest_1

spring.cloud.stream.binders.binder1.type=rabbit
spring.cloud.stream.binders.binder1.environment.spring.rabbitmq.host=localhost

配置（用于在测试中注入代理服务）：

@Configuration
public class ExampleConfig {

    @Bean
    public PublisherAnnotationBeanPostProcessor publisherAnnotationBeanPostProcessor(){
         PublisherAnnotationBeanPostProcessor publisherAnnotationBeanPostProcessor =
            new PublisherAnnotationBeanPostProcessor();
        publisherAnnotationBeanPostProcessor.setProxyTargetClass(true);
        return publisherAnnotationBeanPostProcessor;
    }
}

测试：

@RunWith(SpringRunner.class)
@SpringBootTest
public class ExampleServiceTest {

    @Autowired
    private ExampleService exampleService;

    @Test
    public void testQueue() throws InterruptedException {
        exampleService.queue("Hello!");
        Thread.sleep(1000);//Wait for message processing
        System.out.println("Ready!");
    }
}

我有以下输出：

17:19:10.230 [dest1.group1-2] DEBUG o.s.c.s.b.StreamListenerMessageHandler - org.springframework.cloud.stream.binding.StreamListenerMessageHandler@575c3e9b received message: GenericMessage [payload=Hello!, headers={amqp_receivedDeliveryMode=PERSISTENT, amqp_receivedRoutingKey=dest1, amqp_receivedExchange=dest1, amqp_deliveryTag=1, amqp_consumerQueue=dest1.group1, amqp_redelivered=false, id=2f22ce16-bb5a-350c-8b3d-e6c898760888, amqp_consumerTag=amq.ctag-sxu6zQHJTGrsazfwbmol9Q, contentType=text/plain, timestamp=1547583550230}]
New message: Hello!
17:19:10.231 [dest1.group1-1] DEBUG o.s.c.s.b.StreamListenerMessageHandler - handler 'org.springframework.cloud.stream.binding.StreamListenerMessageHandler@575c3e9b' produced no reply for request Message: GenericMessage [payload=Hello!, headers={amqp_receivedDeliveryMode=PERSISTENT, amqp_receivedRoutingKey=dest1, amqp_receivedExchange=dest1, amqp_deliveryTag=1, amqp_consumerQueue=dest1.group1, amqp_redelivered=false, id=788e8bbf-4ae4-86cc-0859-d4f153cb5807, amqp_consumerTag=amq.ctag-fV0aaDzYUZfq08JsODq6pA, contentType=text/plain, timestamp=1547583550230}]
17:19:10.231 [dest1.group1-1] DEBUG o.s.i.channel.DirectChannel - postSend (sent=true) on channel 'input1', message: GenericMessage [payload=Hello!, headers={amqp_receivedDeliveryMode=PERSISTENT, amqp_receivedRoutingKey=dest1, amqp_receivedExchange=dest1, amqp_deliveryTag=1, amqp_consumerQueue=dest1.group1, amqp_redelivered=false, id=788e8bbf-4ae4-86cc-0859-d4f153cb5807, amqp_consumerTag=amq.ctag-fV0aaDzYUZfq08JsODq6pA, contentType=text/plain, timestamp=1547583550230}]
New message: Hello!
17:19:10.232 [dest1.group1-2] DEBUG o.s.c.s.b.StreamListenerMessageHandler - handler 'org.springframework.cloud.stream.binding.StreamListenerMessageHandler@575c3e9b' produced no reply for request Message: GenericMessage [payload=Hello!, headers={amqp_receivedDeliveryMode=PERSISTENT, amqp_receivedRoutingKey=dest1, amqp_receivedExchange=dest1, amqp_deliveryTag=1, amqp_consumerQueue=dest1.group1, amqp_redelivered=false, id=2f22ce16-bb5a-350c-8b3d-e6c898760888, amqp_consumerTag=amq.ctag-sxu6zQHJTGrsazfwbmol9Q, contentType=text/plain, timestamp=1547583550230}]
17:19:10.232 [dest1.group1-2] DEBUG o.s.i.channel.DirectChannel - postSend (sent=true) on channel 'input1', message: GenericMessage [payload=Hello!, headers={amqp_receivedDeliveryMode=PERSISTENT, amqp_receivedRoutingKey=dest1, amqp_receivedExchange=dest1, amqp_deliveryTag=1, amqp_consumerQueue=dest1.group1, amqp_redelivered=false, id=2f22ce16-bb5a-350c-8b3d-e6c898760888, amqp_consumerTag=amq.ctag-sxu6zQHJTGrsazfwbmol9Q, contentType=text/plain, timestamp=1547583550230}]
Ready!

我不知道我的配置有什么问题，或者如果是一些错误，有什么建议吗？

谢谢！

已编辑：

我上传了一个（非）工作示例here

您可以使用以下方法创建 RabbitMQ 实例：

docker run -p 5672:5672 -p 15672:15672 rabbitmq:3-management

Answer 1

我认为，从配置来看，您正试图再次将相同的消息发布到相同的目的地dest_1。

spring.cloud.stream.bindings.input1.destination=dest_1
spring.cloud.stream.bindings.output1.destination=dest_1

从日志中可以清楚地看出，第二条消息具有不同的 ID

id=788e8bbf-4ae4-86cc-0859-d4f153cb5807
id=2f22ce16-bb5a-350c-8b3d-e6c898760888

Answer 2

由于 ExampleConfig 中的配置，我检测到 @Publisher 发布了两次。这个新配置（借自here）似乎工作正常：

@Bean
public static BeanFactoryPostProcessor bfpp() {
    return bf -> bf.getBean(IntegrationContextUtils.PUBLISHER_ANNOTATION_POSTPROCESSOR_NAME,
        PublisherAnnotationBeanPostProcessor.class).setProxyTargetClass(true);
}

Answer 3

我在调试模式 (intellij) 下运行我的应用程序，因此偏移量没有得到更新。尝试在运行模式下运行，它解决了我的问题。