Is it possible to automatically re-create a queue afters it has been manually removed?
I’m able to create the queue on start up using
@Bean public Queue createRandomQueue(@Qualifier("exporterRabbitAdmin") RabbitAdmin exporterRabbitAdmin) { Queue queue = createQueue("random.queue", exporterRabbitAdmin); exporterRabbitAdmin.declareQueue(queue); return queue; }
However, if it’s manually removed from rabbitmq, I want to be able to create a queue with the same name automatically.
Today if I remove it, I will keep throwing exceptions like
org.springframework.amqp.rabbit.listener.BlockingQueueConsumer$DeclarationException: Failed to declare queue(s):[random.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 .... Caused by: com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=404, reply-text=NOT_FOUND - no queue 'export-hub-activity.retry.queue' in vhost 'default', 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]
Advertisement
Answer
Yes, you can re-create the queue which you have deleted. In RabbitMQ each operation is an event. When a queue is deleted, it is recorded as an event and these events can be consumed like normal messages.
You can enable RabbitMQ events by enabling the rabbitmq_event_exchange plugin. Once it is set, bind it to a queue. While consuming the messages from the events-queue, you need to check for the message that contains queue.deleted
. If there is any such message, you can re-create the queue. The queue.deleted
event will also contain the queue name
and the virtual host
Reference: https://www.rabbitmq.com/event-exchange.html