Spring中与JMS主题的并发

Question

How to use concurrency in jms topics using spring? Like for queues we can set maxConcurrentConsumers properties to the desired number. But if I do that for a JMS topic, it leads to concurrent consumption of the same message, which is not desirable.

Can somebody please point me in the right direction?

Answer 1

You are using the DefaultMessageListenerContainer in a wrong way. From the docs:

Note that dynamic scaling only really makes sense for a queue in the first place; for a topic, you will typically stick with the default number of 1 consumer, else you'd receive the same message multiple times on the same node.

To help your situation you may forward messages from the topic to a queue and let your consumers consume from this queue. If your JMS provider has some forwarding feature, than this is merely a configuration change to your application.

Answer 2

Well you said it yourself in a comment, but just to elaborate.

Inside your listener, you can still create multiple threads and execute the processing in an asynchronous way . As soon as you get your messages dispatch it to a asynchronous consumer. This is fairly easily implemented through some sort of executor for example.

I would really go for the guava's EventBus . It is so simple, yet so easy to set up and use. But this is your choice really.