JMS，仅使用一次来自主题的消息

Question

I have a requirement to establish a point to point communication with publisher and consumer in my application. What I'm given is a topic. So I should make sure the message in the topic will be consumed only once and only one instance should consume it. (There are multiple instances of the consumer.)

I understand message queue is the solution for the above requirement. But I will have to work with the topic given instead.

I tried one sample application and my all my consumer instances consumed the message in the topic. I planned to use a table to keep a track of message processing but it does not seem like a good solution. We use IBM MQ with spring boot JMS. Is this something doable?

Answer 1

JMS topics, generally speaking, provide publish-subscribe semantics in which every consumer/subscriber gets every message sent to the topic. However, there is a way to get point-to-point semantics with multiple consumers on a JMS topic - shared subscriptions.

Shared subscriptions are available from JMS 2 onward. When using this feature multiple consumers/subscribers can share the same subscription and only one of those consumers will receive a given message.

The simplest way to create a shared subscription is by using javax.jms.Session.createSharedConsumer() . This will create a shared, non-durable subscription and unlike when creating a durable subscription setting the client ID on the connection is optional . There are other related methods for creating shared, durable subscriptions, using selectors, etc.

In short, as long as all the consumers are creating a shared subscription using the same subscription name then you can get the point-to-point semantics you need.