Spring annotation @Retryable -如何设置拦截器

Question

我在@Service类中的方法上使用了@Retryable批注

@Service
@EnableRetry 
public class PushService {

    @Retryable(maxAttempts=5)
    public Result pushIt(myMessage messageIn) {
        ...
    }
}

它的工作方式很简单:我直接从RabbitMQ收到一条消息，直到没有错误或尝试次数达到5次时才会得到确认，此时消息会直接到达DLQ，就像我想要的那样。

我唯一的问题是，我需要从属性文件中动态设置maxAttempts。解决方案应该是设置一个拦截器，但拥有一个拦截器的唯一事实会导致错误，例如，当我有：

@Service
@EnableRetry 
public class PushService {

    @Retryable(interceptor="myInterceptor") 
    public Result pushIt(myMessage messageIn) {
        ...
    }
}

其中，myInterceptor定义为：

@Bean
public StatefulRetryOperationsInterceptor myInterceptor() {
    return RetryInterceptorBuilder.stateful().maxAttempts(5).build();
}

我得到了一个无限循环，但有以下异常：

2015-04-08 07:12:10,970 GMT [SimpleAsyncTaskExecutor-1] (ConditionalRejectingErrorHandler.java:67) WARN  listener.ConditionalRejectingErrorHandler: Execution of Rabbit message listener failed.
org.springframework.amqp.rabbit.listener.exception.ListenerExecutionFailedException: Listener threw exception
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.wrapToListenerExecutionFailedExceptionIfNeeded(AbstractMessageListenerContainer.java:864)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:802)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:690)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$001(SimpleMessageListenerContainer.java:82)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$1.invokeListener(SimpleMessageListenerContainer.java:167)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.invokeListener(SimpleMessageListenerContainer.java:1241)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.executeListener(AbstractMessageListenerContainer.java:660)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.doReceiveAndExecute(SimpleMessageListenerContainer.java:1005)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.receiveAndExecute(SimpleMessageListenerContainer.java:989)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer.access$700(SimpleMessageListenerContainer.java:82)
    at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1103)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
    at org.springframework.amqp.rabbit.config.StatefulRetryOperationsInterceptorFactoryBean$3.getKey(StatefulRetryOperationsInterceptorFactoryBean.java:103)
    at org.springframework.retry.interceptor.StatefulRetryOperationsInterceptor.invoke(StatefulRetryOperationsInterceptor.java:132)
    at org.springframework.retry.annotation.AnnotationAwareRetryOperationsInterceptor.invoke(AnnotationAwareRetryOperationsInterceptor.java:118)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:653)
    at com.acme.push.service.PushService$$EnhancerBySpringCGLIB$$9d503bc1.pushMessage(<generated>)
    at com.acme.push.receiver.PushListener.onMessage(PushListener.java:42)
    at org.springframework.amqp.rabbit.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:799)
    ... 10 more

我很确定我把它保持得太简单了，但我就是不知道是什么导致了这个错误，以及如何解决它，有人知道发生了什么吗？

Answer 1

我最终设法在不使用@Retrayable注释的情况下获得了所需的灵活性。

我用我的延迟和最大尝试次数参数创建了一个RetryAdvice：

@Bean
public MethodInterceptor retryAdvice() {
    FixedBackOffPolicy backOffPolicy = new FixedBackOffPolicy();
    backOffPolicy.setBackOffPeriod(delay);
    return RetryInterceptorBuilder.stateless().backOffPolicy(backOffPolicy)
            .maxAttempts(maxAttempts).build();
}

我将建议插入到ListenerContainer的adviceChain中

@Bean
public SimpleMessageListenerContainer replyListenerContainer() {
    SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
    container.setConnectionFactory(pushConnectionFactory());
    container.setQueues(pushQueue());
    container.setMessageListener(pushListener());

    Advice[] adviceChain = new Advice[] { retryAdvice() };
    container.setAdviceChain(adviceChain);

    return container;
}

这样，每当我的听众抛出

throw new AmqpRejectAndDontRequeueException(cause);

这将导致容器以所需的延迟重试所指示的次数，之后将传播异常并在DLQ中传递消息

Answer 2

不能通过注释@Retryable来使用org.springframework.amqp.rabbit.config.RetryInterceptorBuilder。

它的用途是与SimpleRabbitListenerContainerFactory类的通知链一起使用。请参阅参考文档receiving-messages和SimpleMessageListenerContainer#invokeListener签名：

@Override
protected void invokeListener(Channel channel, Message message) throws Exception {
    proxy.invokeListener(channel, message);
}

一旦您为通知链配置了适当的RetryInterceptor，您的注释就会变得毫无用处。