从this question开始，我们有一个场景，其中Rabbit凭据无效，我们需要在resetConnection()上调用CachingConnectionFactory来获取一组新的凭据。
我们在ShutdownSignalException处理程序中执行此操作，它基本上可以正常工作。什么不起作用，我们还需要重新启动我们的听众。我们有以下几个：
@RabbitListener(
id = ABC,
bindings = @QueueBinding(value = @Queue(value="myQ", durable="true"),
exchange = @Exchange(value="myExchange", durable="true"),
key = "myKey"),
containerFactory = "customQueueContainerFactory"
)
public void process(...) {
...
}
this answer（也是this）给出的印象是我们只需要这样做：
@Autowired RabbitListenerEndpointRegistry registry;
@Autowired CachingConnectionFactory connectionFactory;
@Override
public void shutdownCompleted(ShutdownSignalException cause) {
refreshRabbitMQCredentials();
}
public void refreshRabbitMQCredentials() {
registry.stop(); // do this first
// Fetch credentials, update username/pass
connectionFactory.resetConnection(); // then this
registry.start(); // finally restart
}
问题在于调试了SimpleMessageListenerContainer，当第一个容器调用了doShutdown()时，Spring会尝试取消BlockingQueueConsumer。
因为底层Channel仍然报告为打开 - 即使RabbitMQ UI没有报告任何连接或通道被打开 - 一个Cancel事件被发送到ChannelN.basicCancel()内的代理，但是频道然后会永久阻止回复，因此容器关闭完全被阻止。
我尝试将TaskExecutor（一个Executors.newCachedThreadPool()）注入容器并调用shutdownNow()或打断它们，但这些都不会影响频道的拦截等待。
看起来我解锁频道的唯一选择是在取消期间触发额外的ShutdownSignalException，但是（a）我不知道如何做到这一点，并且（b）它看起来像在尝试再次关闭之前，我必须并行启动所有侦听器的取消。
// com.rabbitmq.client.impl.ChannelN
@Override
public void basicCancel(final String consumerTag) throws IOException
{
// [snip]
rpc(new Basic.Cancel(consumerTag, false), k);
try {
k.getReply(); // <== BLOCKS HERE
} catch(ShutdownSignalException ex) {
throw wrap(ex);
}
metricsCollector.basicCancel(this, consumerTag);
}
我不确定为什么这证明这么困难。是否有更简单的方法强制SimpleMessageListenerContainer关闭？
使用Spring Rabbit 1.7.6; AMQP Client 4.0.3; Spring Boot 1.5.10-RELEASE
更新
一些日志用于演示消息容器在连接刷新完成之前重新启动的理论，这可能就是他们不重新连接的原因：
ERROR o.s.a.r.c.CachingConnectionFactory - Channel shutdown: channel error; protocol method: #method<channel.close>(reply-code=403, reply-text=ACCESS_REFUSED - access to queue 'amq.gen-4-bqGxbLio9mu8Kc7MMexw' in vhost '/' refused for user 'cert-configserver-feb6e103-76a8-f5bf-3f23-1e8150812bc4', class-id=50, method-id=10)
INFO u.c.c.c.r.ReauthenticatingChannelListener - Channel shutdown: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=403, reply-text=ACCESS_REFUSED - access to queue 'amq.gen-4-bqGxbLio9mu8Kc7MMexw' in vhost '/' refused for user 'cert-configserver-feb6e103-76a8-f5bf-3f23-1e8150812bc4', class-id=50, method-id=10)
INFO u.c.c.c.r.ReauthenticatingChannelListener - Channel closed with reply code 403. Assuming credentials have been revoked and refreshing config server properties to get new credentials. Cause: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=403, reply-text=ACCESS_REFUSED - access to queue 'amq.gen-4-bqGxbLio9mu8Kc7MMexw' in vhost '/' refused for user 'cert-configserver-feb6e103-76a8-f5bf-3f23-1e8150812bc4', class-id=50, method-id=10)
WARN u.c.c.c.r.ReauthenticatingChannelListener - Shutdown signalled: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=403, reply-text=ACCESS_REFUSED - access to queue 'amq.gen-4-bqGxbLio9mu8Kc7MMexw' in vhost '/' refused for user 'cert-configserver-feb6e103-76a8-f5bf-3f23-1e8150812bc4', class-id=50, method-id=10)
INFO u.c.c.c.r.RabbitMQReauthenticator - Refreshing Rabbit credentials for XXXXXXXX
INFO o.s.c.c.c.ConfigServicePropertySourceLocator - Fetching config from server at: http://localhost:8888/configuration
INFO u.c.c.c.r.ReauthenticatingChannelListener - Got ListenerContainerConsumerFailedEvent: Consumer raised exception, attempting restart
INFO o.s.a.r.l.SimpleMessageListenerContainer - Restarting Consumer@2db55dec: tags=[{amq.ctag-ebAfSnXLbw_W1hlZ5ag7sQ=consumer.myQ}], channel=Cached Rabbit Channel: AMQChannel(amqp://cert-configserver-feb6e103-76a8-f5bf-3f23-1e8150812bc4@127.0.0.1:5672/,2), conn: Proxy@12de62aa Shared Rabbit Connection: SimpleConnection@56c95789 [delegate=amqp://cert-configserver-feb6e103-76a8-f5bf-3f23-1e8150812bc4@127.0.0.1:5672/, localPort= 50052], acknowledgeMode=AUTO local queue size=0
INFO o.s.c.c.c.ConfigServicePropertySourceLocator - Located environment: name=myApp, profiles=[default], label=null, version=null, state=null
INFO com.zaxxer.hikari.HikariDataSource - XXXXXXXX - Shutdown initiated...
INFO com.zaxxer.hikari.HikariDataSource - XXXXXXXX - Shutdown completed.
INFO u.c.c.c.r.RabbitMQReauthenticator - Refreshed username: 'cert-configserver-feb6e103-76a8-f5bf-3f23-1e8150812bc4' => 'cert-configserver-d7b54af2-0735-a9ed-7cc4-394803bf5e58'
INFO u.c.c.c.r.RabbitMQReauthenticator - CachingConnectionFactory reset, proceeding...
更新2：
这似乎是各种各样的竞争条件。删除容器停止/启动后，如果我向SimpleMessageListenerContainer.restart()添加一个仅限线程的断点以让resetConnection()比赛过去，然后释放断点，那么我可以看到事情开始回归：< / p>
16:18:47,208 INFO u.c.c.c.r.RabbitMQReauthenticator - CachingConnectionFactory reset
// Get ready to release the SMLC.restart() breakpoint...
16:19:02,072 INFO o.s.a.r.c.CachingConnectionFactory - Attempting to connect to: rabbitmq.service.consul:5672
16:19:02,083 INFO o.s.a.r.c.CachingConnectionFactory - Created new connection: connectionFactory#7489bca4:1/SimpleConnection@68546c13 [delegate=amqp://cert-configserver-132a07c2-94f3-0099-4de1-f0b1a9875d5a@127.0.0.1:5672/, localPort= 33350]
16:19:02,086 INFO o.s.amqp.rabbit.core.RabbitAdmin - Auto-declaring a non-durable, auto-delete, or exclusive Queue ...
16:19:02,095 DEBUG u.c.c.c.r.ReauthenticatingChannelListener - Active connection check succeeded for channel AMQChannel(amqp://cert-configserver-132a07c2-94f3-0099-4de1-f0b1a9875d5a@127.0.0.1:5672/,1)
16:19:02,120 INFO o.s.amqp.rabbit.core.RabbitAdmin - Auto-declaring a non-durable, auto-delete, or exclusive Queue (springCloudBus...
在这种情况下，我现在必须解决如何延迟容器重启直到刷新完成（即我的ShutdownSignalException处理程序完成），或以某种方式使刷新阻塞...
更新3：
我的整体问题，这是一个症状，解决了：https://stackoverflow.com/a/49392990/954442
答案 0 :(得分：1)
根本不清楚为什么频道会报道为公开;这对我来说很好;它在删除用户foo ...
@SpringBootApplication
public class So49323291Application {
public static void main(String[] args) {
SpringApplication.run(So49323291Application.class, args);
}
@Bean
public ApplicationRunner runner(RabbitListenerEndpointRegistry registry, CachingConnectionFactory cf,
RabbitTemplate template) {
return args -> {
cf.setUsername("foo");
cf.setPassword("bar");
registry.start();
doSends(template);
registry.stop();
cf.resetConnection();
cf.setUsername("baz");
cf.setPassword("qux");
registry.start();
doSends(template);
};
}
public void doSends(RabbitTemplate template) {
while (true) {
try {
template.convertAndSend("foo", "Hello");
Thread.sleep(5_000);
}
catch (Exception e) {
e.printStackTrace();
break;
}
}
}
@RabbitListener(queues = "foo", autoStartup = "false")
public void in(Message in) {
System.out.println(in);
}
}
（正文：'Hello'MessageProperties [headers = {}，contentType = text / plain，contentEncoding = UTF-8，contentLength = 0，receivedDeliveryMode = PERSISTENT，priority = 0，redelivered = false，receivedExchange =，receivedRoutingKey = foo ，deliveryTag = 4，consumerTag = amq.ctag-9zt3wUGYSJmoON3zw03wUw，consumerQueue = foo]）
2018-03-16 11：24：01.451 ERROR 11867 --- [127.0.0.1:5672] o.s.a.r.c.CachingConnectionFactory：频道关闭：连接错误;协议方法：#method（reply-code = 320，reply-text = CONNECTION_FORCED - 删除用户'foo'，class-id = 0，method-id = 0）
...
引起：com.rabbitmq.client.AuthenticationFailureException：ACCESS_REFUSED - 使用身份验证机制PLAIN拒绝登录。有关详细信息，请参阅代理日志文件。
2018-03-16 11：24：01.745 ERROR 11867 --- [cTaskExecutor-2] o.s.a.r.l.SimpleMessageListenerContainer：从已中止的消费者处停止容器
2018-03-16 11：24：03.740 INFO 11867 --- [cTaskExecutor-3] osarcCachingConnectionFactory：创建新连接：rabbitConnectionFactory＃2c4d1ac：3 / SimpleConnection @ 5e9c036b [delegate = amqp：//baz@127.0。 0.1：5672 /，localPort = 59346]
（正文：'Hello'MessageProperties [headers = {}，contentType = text / plain，contentEncoding = UTF-8，contentLength = 0，receivedDeliveryMode = PERSISTENT，priority = 0，redelivered = false，receivedExchange =，receivedRoutingKey = foo ，deliveryTag = 1，consumerTag = amq.ctag-ljnY00TBuvy5cCAkpD3r4A，consumerQueue = foo]）
但是，您实际上不需要停止/启动注册表，只需使用新凭据重新配置连接工厂并调用resetConnection();容器将恢复。