java - Dynamic addition of queues to a rabbit listener at runtime

Question

I've got a project where we are going to have hundreds (potentially thousands) of queues in rabbit and each of these queues will need to be consumed by a pool of consumers.

In rabbit (using spring-amqp), you have the rabbitlistener annotation which allows me to statically assign the queues this particular consumer(s) will handle.

My question is - with rabbit and spring, is there a clean way for me to grab a section of queues (lets say queues that start with a-c) and then also listen for any queues that are created while the consumer is running.

Example (at start):

• ant-queue
• apple-queue
• cat-queue

While consumer is running:

• Add bat-queue

Here is the (very simple) code I currently have:

    @Component
    public class MessageConsumer {

        public MessageConsumer() {
            // ideally grab a section of queues here, initialize a parameter and give to the rabbitlistener annotation
        }

        @RabbitListener(queues= {"ant-queue", "apple-queue", "cat-queue"})
        public void processQueues(String messageAsJson) {
            < how do I update the queues declared in rabbit listener above ? >
        }
    }

Edit:

I should add - I've gone through the spring amqp documentation I found online and I haven't found anything outside of statically (either hardcoded or via properties) declaring the queues

Answer 1

• Inject (@Autowired or otherwise) the RabbitListenerEndpointRegistry.

• Get a reference to the listener container (use the id attribute on the annotation to give it a known id) (registry.getListenerContainer(id)).

• Cast the container to an AbstractMessageListenerContainer and call addQueues() or addQueueNames().

Note that is more efficient to use a DirectMessageListenerContainer when adding queues dynamically; with a SimpleMessageListenerContainer the consumer(s) are stopped and restarted. With the direct container, each queue gets its own consumer(s).

See Choosing a container.