我正在开发一个Spring项目，我正在尝试使用RabbitMQ队列的死字法实现指数退避 .
在此过程中，我创建了一个名为RetryTemplate的ExponentialBackOffPolicy .
出于测试目的，我的消费者只是通过抛出异常来拒绝它获得的所有消息 .
这是我的RabbitMQConfiguration类的样子：
@Configuration
@EnableAutoConfiguration
@PropertySource("file:${HOME}/common/config/wave-planning.properties")
public class RabbitMQConfiguration {
private final static String QUEUE_NAME = "orderPlanQueue";
private static final String EXCHANGE_NAME = "orderPlanExchange";
private static final String DL_EXCHANGE_NAME = "deadLetterExchange";
private static final String DL_QUEUE_NAME = "deadLetterQueue";
@Value("${rabbitmq.host:localhost}")
private String host;
@Value("${rabbitmq.port:5672}")
private int port;
@Value("${rabbitmq.user:guest}")
private String userName;
@Value("${rabbitmq.password:guest}")
private String password;
@Value("${rabbitmq.initial_backoff_interval:1000}")
private int INITIAL_INTERVAL_IN_MILLISECONDS;
@Value("${rabbitmq.max_backoff_interval:10000}")
private int MAX_INTERVAL_IN_MILLISECONDS;
@Autowired
OrderPlanService orderPlanService;
@Bean
Queue queue() {
Map<String, Object> qargs = new HashMap<String, Object>();
qargs.put("x-dead-letter-exchange", DL_EXCHANGE_NAME);
return new Queue(QUEUE_NAME, false, false, false, qargs);
}
@Bean
TopicExchange exchange() {
return new TopicExchange(EXCHANGE_NAME);
}
@Bean
FanoutExchange deadLetterExchange() { return new FanoutExchange(DL_EXCHANGE_NAME); }
@Bean
Queue deadLetterQueue() { return new Queue(DL_QUEUE_NAME); }
@Bean
Binding deadLetterBinding(Queue deadLetterQueue, FanoutExchange deadLetterExchange) {
return BindingBuilder.bind(deadLetterQueue).to(deadLetterExchange);
}
@Bean
Binding binding(Queue queue, TopicExchange exchange) {
return BindingBuilder.bind(queue).to(exchange).with(QUEUE_NAME);
}
@Bean
public ConnectionFactory connectionFactory() {
CachingConnectionFactory connectionFactory = new CachingConnectionFactory(host);
connectionFactory.setPort(port);
connectionFactory.setUsername(userName);
connectionFactory.setPassword(password);
return connectionFactory;
}
@Bean
public MessageConverter Jackson2JsonMessageConverter() {
return new Jackson2JsonMessageConverter();
}
@Bean
public AmqpTemplate rabbitTemplate() {
RabbitTemplate template = new RabbitTemplate(connectionFactory());
RetryTemplate retry = new RetryTemplate();
ExponentialBackOffPolicy policy = new ExponentialBackOffPolicy();
policy.setInitialInterval(INITIAL_INTERVAL_IN_MILLISECONDS);
policy.setMultiplier(2);
policy.setMaxInterval(MAX_INTERVAL_IN_MILLISECONDS);
retry.setBackOffPolicy(policy);
template.setRetryTemplate(retry);
template.setRoutingKey(QUEUE_NAME);
template.setMessageConverter(Jackson2JsonMessageConverter());
return template;
}
@Bean
SimpleMessageListenerContainer container(ConnectionFactory connectionFactory, MessageListenerAdapter listenerAdapter) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
container.setMessageConverter(Jackson2JsonMessageConverter());
container.setQueueNames(QUEUE_NAME);
container.setMessageListener(listenerAdapter);
container.setDefaultRequeueRejected(false);
return container;
}
@Bean
MessageListenerAdapter listenerAdapter() {
return new MessageListenerAdapter(orderPlanService, "consume");
}
}
消费者的相关部分基本上是这样的：
@Service
@Transactional
public class BaseOrderPlanService implements OrderPlanService {
....
@Override
public void consume(Object object) {
throw new IllegalArgumentException("Test");
}
}
对于自动装配的整数值，使用默认值 .
在运行它时，我看到交换和队列是按照预期在rabbitmq上创建的，其中包含相关的预期绑定和参数 .
但是，当我使用路由键"orderPlanQueue"将消息传递给orderPlanExchange时，它将导致无限循环，因为消息被拒绝并重复替换在队列中 .
另一方面，如果IllegalArgumentException被AmqpRejectAndDontRequeueException替换，则在第一次拒绝尝试时将消息简单地抛入死信队列 .
如果有人可以在这里指出我可能做错了重试政策没有应用，我会非常感激 .
编辑：根据Artem的建议使用StatefulRetryOperationsInterceptor进行编码 .
@Configuration
@EnableAutoConfiguration
@PropertySource("file:${HOME}/common/config/wave-planning.properties")
public class RabbitMQConfiguration {
private final static String QUEUE_NAME = "orderPlanQueue";
private static final String EXCHANGE_NAME = "orderPlanExchange";
private static final String DL_EXCHANGE_NAME = "deadLetterExchange";
private static final String DL_QUEUE_NAME = "deadLetterQueue";
@Value("${rabbitmq.host:localhost}")
private String host;
@Value("${rabbitmq.port:5672}")
private int port;
@Value("${rabbitmq.user:guest}")
private String userName;
@Value("${rabbitmq.password:guest}")
private String password;
@Value("${rabbitmq.initial_backoff_interval:1000}")
private int INITIAL_INTERVAL_IN_MILLISECONDS;
@Value("${rabbitmq.max_backoff_interval:10000}")
private int MAX_INTERVAL_IN_MILLISECONDS;
@Autowired
OrderPlanService orderPlanService;
@Bean
Queue queue() {
Map<String, Object> qargs = new HashMap<String, Object>();
qargs.put("x-dead-letter-exchange", DL_EXCHANGE_NAME);
return new Queue(QUEUE_NAME, false, false, false, qargs);
}
@Bean
TopicExchange exchange() {
return new TopicExchange(EXCHANGE_NAME);
}
@Bean
Binding binding(Queue queue, TopicExchange exchange) {
return BindingBuilder.bind(queue).to(exchange).with(QUEUE_NAME);
}
@Bean
FanoutExchange deadLetterExchange() { return new FanoutExchange(DL_EXCHANGE_NAME); }
@Bean
Queue deadLetterQueue() { return new Queue(DL_QUEUE_NAME); }
@Bean
Binding deadLetterBinding(Queue deadLetterQueue, FanoutExchange deadLetterExchange) {
return BindingBuilder.bind(deadLetterQueue).to(deadLetterExchange);
}
@Bean
public ConnectionFactory connectionFactory() {
CachingConnectionFactory connectionFactory = new CachingConnectionFactory(host);
connectionFactory.setPort(port);
connectionFactory.setUsername(userName);
connectionFactory.setPassword(password);
return connectionFactory;
}
@Bean
public MessageConverter Jackson2JsonMessageConverter() {
return new Jackson2JsonMessageConverter();
}
@Bean
public AmqpTemplate rabbitTemplate() {
RabbitTemplate template = new RabbitTemplate(connectionFactory());
/*
RetryTemplate retry = new RetryTemplate();
ExponentialBackOffPolicy policy = new ExponentialBackOffPolicy();
policy.setInitialInterval(INITIAL_INTERVAL_IN_MILLISECONDS);
policy.setMultiplier(2);
policy.setMaxInterval(MAX_INTERVAL_IN_MILLISECONDS);
retry.setBackOffPolicy(policy);
template.setRetryTemplate(retry);
*/
template.setRoutingKey(QUEUE_NAME);
template.setMessageConverter(Jackson2JsonMessageConverter());
return template;
}
@Bean
StatefulRetryOperationsInterceptor interceptor() {
return RetryInterceptorBuilder.stateful()
.maxAttempts(4)
.backOffOptions(INITIAL_INTERVAL_IN_MILLISECONDS, 2, MAX_INTERVAL_IN_MILLISECONDS)
.build();
}
@Bean
SimpleMessageListenerContainer container(ConnectionFactory connectionFactory, MessageListenerAdapter listenerAdapter) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
container.setMessageConverter(Jackson2JsonMessageConverter());
container.setQueueNames(QUEUE_NAME);
container.setMessageListener(listenerAdapter);
container.setAdviceChain(new Advice[] {interceptor()});
return container;
}
@Bean
MessageListenerAdapter listenerAdapter() {
return new MessageListenerAdapter(orderPlanService, "consume");
}
}
1 回答
RabbitTemplate上的重试策略与DLQ / DLX完全无关 . 这是为了 consumer 方面 .请参阅参考手册here中的差异：
和here：
因此，您必须重新考虑您的逻辑并将重试功能置于
SimpleMessageListenerContainer定义中 .