我试图更好地理解 RabbitListener 我已经在本地主机：6672上的docker容器中设置了一个rabbit，并创建了一个简单的spring boot应用程序来监听消息。还配置了 application.yml 来指向这只兔子。
@RabbitListener(containerFactory = "myListenerContainerFactory",
bindings = @QueueBinding(value = @Queue(value = "MY_QUEUE"), exchange = @Exchange(value = "MY_EXCHANGE"), key = "MY_KEY"))
public void onMessage(final Mesg message) {
//some handling
}
还定义了下面的容器工厂
@Bean
public SimpleRabbitListenerContainerFactory rabbitListenerContainerFactory(ConnectionFactory cf) {
SimpleRabbitListenerContainerFactory factory = new SimpleRabbitListenerContainerFactory();
factory.setConnectionFactory(cf);
factory.setMessageConverter(new Jackson2JsonMessageConverter());
factory.setDefaultRequeueRejected(false);
factory.setConsumerTagStrategy(q -> "My App");
return factory;
}
当rabbit容器运行的时候，我把spring boot应用带上来了& 它能够自动创建exchangequeue& 能够消耗我通过rabbit管理控制台发布的消息。我强行删除了rabbit容器(docker rm my_instance -f当spring boot app运行时，它开始打印下面的消息。
2020-05-26 17:03:15.097 ERROR 26816 --- [ 127.0.0.1:6672] o.s.a.r.c.CachingConnectionFactory : Channel shutdown: connection error
2020-05-26 17:03:15.614 INFO 26816 --- [cTaskExecutor-1] o.s.a.r.l.SimpleMessageListenerContainer : Restarting Consumer@69176296: tags=[[My App]], channel=Cached Rabbit Channel: AMQChannel(amqp://[email protected]:6672/,1), conn: Proxy@522c56e8 Shared Rabbit Connection: SimpleConnection@7578dfd0 [delegate=amqp://[email protected]:6672/, localPort= 65342], acknowledgeMode=AUTO local queue size=0
2020-05-26 17:03:15.618 INFO 26816 --- [cTaskExecutor-2] o.s.a.r.c.CachingConnectionFactory : Attempting to connect to: localhost:6672
2020-05-26 17:03:22.662 WARN 26816 --- [cTaskExecutor-2] o.s.a.r.l.SimpleMessageListenerContainer : Consumer raised exception, processing can restart if the connection factory supports it. Exception summary: org.springframework.amqp.AmqpConnectException: java.net.ConnectException: Connection refused: connect
2020-05-26 17:03:22.663 INFO 26816 --- [cTaskExecutor-2] o.s.a.r.l.SimpleMessageListenerContainer : Restarting Consumer@31978e0c: tags=[[]], channel=null, acknowledgeMode=AUTO local queue size=0
2020-05-26 17:03:22.663 INFO 26816 --- [cTaskExecutor-3] o.s.a.r.c.CachingConnectionFactory : Attempting to connect to: localhost:6672
2020-05-26 17:03:29.683 WARN 26816 --- [cTaskExecutor-3] o.s.a.r.l.SimpleMessageListenerContainer : Consumer raised exception, processing can restart if the connection factory supports it. Exception summary: org.springframework.amqp.AmqpConnectException: java.net.ConnectException: Connection refused: connect
再次启动兔子容器后，spring boot app似乎已经检测到了它，但是它打印了下面的消息& 我不认为它已经建立了一个成功的连接。看了一下日志，它似乎默认设置了3次重试，有什么配置可以让我增加限制吗？
有什么最佳实践可以处理这种情况吗？我的应用程序预计将与不同的兔子集群连接，它可能会有一个或其他的维护& 我需要一种方法来重新连接自动，一旦兔子集群恢复。
2020-05-26 17:05:18.303 INFO 26816 --- [TaskExecutor-19] o.s.a.r.l.SimpleMessageListenerContainer : Restarting Consumer@5053bc3c: tags=[[]], channel=null, acknowledgeMode=AUTO local queue size=0
2020-05-26 17:05:18.306 INFO 26816 --- [TaskExecutor-20] o.s.a.r.c.CachingConnectionFactory : Attempting to connect to: localhost:6672
2020-05-26 17:05:18.348 INFO 26816 --- [TaskExecutor-20] o.s.a.r.c.CachingConnectionFactory : Created new connection: myConnectionFactory#ebfe707:19/SimpleConnection@19d03268 [delegate=amqp://[email protected]:6672/, localPort= 49260]
2020-05-26 17:05:18.396 WARN 26816 --- [TaskExecutor-20] o.s.a.r.listener.BlockingQueueConsumer : Failed to declare queue: MY_QUEUE
2020-05-26 17:05:18.402 WARN 26816 --- [TaskExecutor-20] o.s.a.r.listener.BlockingQueueConsumer : Queue declaration failed; retries left=3
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer$DeclarationException: Failed to declare queue(s):[MY_QUEUE]
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.attemptPassiveDeclarations(BlockingQueueConsumer.java:710) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.passiveDeclarations(BlockingQueueConsumer.java:594) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:581) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.initialize(SimpleMessageListenerContainer.java:1196) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1041) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: java.io.IOException: null
at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:126) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQChannel.wrap(AMQChannel.java:122) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:144) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.ChannelN.queueDeclarePassive(ChannelN.java:1006) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.ChannelN.queueDeclarePassive(ChannelN.java:52) ~[amqp-client-5.4.3.jar:5.4.3]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
at org.springframework.amqp.rabbit.connection.CachingConnectionFactory$CachedChannelInvocationHandler.invoke(CachingConnectionFactory.java:1110) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
at com.sun.proxy.$Proxy283.queueDeclarePassive(Unknown Source) ~[na:na]
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.attemptPassiveDeclarations(BlockingQueueConsumer.java:689) ~[spring-rabbit-2.1.4.RELEASE.jar:2.1.4.RELEASE]
... 5 common frames omitted
Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=404, reply-text=NOT_FOUND - no queue 'MY_QUEUE' in vhost '/', class-id=50, method-id=10)
at com.rabbitmq.utility.ValueOrException.getValue(ValueOrException.java:66) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.utility.BlockingValueOrException.uninterruptibleGetValue(BlockingValueOrException.java:36) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQChannel$BlockingRpcContinuation.getReply(AMQChannel.java:494) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQChannel.privateRpc(AMQChannel.java:288) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:138) ~[amqp-client-5.4.3.jar:5.4.3]
... 14 common frames omitted
Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=404, reply-text=NOT_FOUND - no queue 'MY_QUEUE' in vhost '/', class-id=50, method-id=10)
at com.rabbitmq.client.impl.ChannelN.asyncShutdown(ChannelN.java:516) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.ChannelN.processAsync(ChannelN.java:346) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQChannel.handleCompleteInboundCommand(AMQChannel.java:178) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQChannel.handleFrame(AMQChannel.java:111) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQConnection.readFrame(AMQConnection.java:670) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQConnection.access$300(AMQConnection.java:48) ~[amqp-client-5.4.3.jar:5.4.3]
at com.rabbitmq.client.impl.AMQConnection$MainLoop.run(AMQConnection.java:597) ~[amqp-client-5.4.3.jar:5.4.3]
... 1 common frames omitted
2020-05-26 17:05:23.420 WARN 26816 --- [TaskExecutor-20] o.s.a.r.listener.BlockingQueueConsumer : Failed to declare queue: MY_QUEUE
2020-05-26 17:05:23.425 WARN 26816 --- [TaskExecutor-20] o.s.a.r.listener.BlockingQueueConsumer : Queue declaration failed; retries left=2
reply-text=NOT_FOUND - no queue 'MY_QUEUE' in vhost '/'
你有一个 MY_QUEUE 其中宣布为 auto-delete 并在建立连接的过程中，看起来没有它的再创造。考虑将其作为一个豆子，让 RabbitAdmin 来处理它在重新连接时的创建。
更多信息请参见docs.Spring.iospring-amqpdocs2.2.7.RELEASEreferencehtml#broker-configuration。https:/docs.spring.iospring-amqpdocs2.2.7.RELEASEreferencehtml#broker-configuration。