Spring RabbitMq-队列创建的事件监听器

Question

I would like to know if there are any events published when the queue is actually physically created in Rabbitmq via Spring Api .

The reason I am asking is somehow we have race condition. The subscription for queue is somehow usually taking longer and while the subscription is happening already a message is sent to this queue from BE and as a result queue is not present in Rabbitmq and the message is lost and never reaches FE.

Sorry I cannot provide any code as such, because it wont make much sense by putting a small piece of code.

But I am pretty sure, problem is because of kind of race condition, message to the queue is being sent even before its created. So if there is some event listener I could listen after the queue is created, I could move my logic to this method.

Here is some piece of code,

stomp-client.js

 stompClient.subscribe(destination, function(msg) {});

WebsocketConnectionListener.java

@EventListener
public void handleWebSocketSessionSubscribeEvent(final SessionSubscribeEvent event) {

 // here I think this event is fired before the queue is actual created
 // this event is fired when u send subscription from stomp-client.js

 ...
 ...
 ...

 // trying to send message to this subscribed queue

 simpMessagingTemplate.convertAndSend(TOPIC_PREFIX + destination, data, headers);
 // now this message is lost as sometimes the queue creation takes longer.
 // unfortunately I want to move the convert and send method, when I could listen to queue created event.

 }

Answer 1

There is no event published but you can add a second ConnectionListener to the CachingConnectionFactory . If you make sure it is added after the RabbitAdmin you can be sure that the onCreate() method will be called after the admin has declared all the exchanges, queues, bindings.

See AbstractConnectionFactory.addConnectionListener .