Question

我在@Retryable类

中的方法上使用@Service注释

@Service
@EnableRetry 
public class PushService {

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

它的作用就像一个魅力：我直接从RabbitMQ收到消息，直到没有错误或尝试次数达到5时才会确认，并且此时消息直接进入DLQ，正如我所愿。

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，但是唯一一个导致错误的事实，例如我有：

@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

我很确定我保持这么简单，但我没有找到导致此错误的原因的线索以及如何解决它，任何人都知道发生了什么事情？

Answer 1

org.springframework.amqp.rabbit.config.RetryInterceptorBuilder的目的不是使用注释@Retryable。

其目的是与SimpleRabbitListenerContainerFactory类的建议链一起使用。请参阅参考文档receiving-messages和他SimpleMessageListenerContainer#invokeListener签名：

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

只要您使用适当的RetryInterceptor配置建议链，您的注释就会毫无用处。

Answer 2

我终于设法在不使用@Retrayable注释的情况下获得了所需的灵活性。

我创建了一个RetryAdvice，其中包含延迟和最大尝试次数的参数：

@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;
}

通过这种方式，每当我的倾听者投掷时

throw new AmqpRejectAndDontRequeueException(cause);

这将导致容器以所需的延迟重试指定的次数，之后将传播异常并且消息将在DLQ中传递

Spring注释@Retryable - 如何设置拦截器

2 个答案: