I have used it for my academic project which was online retail website similar to Amazon.
JMS was used to handle following features :
- Update the position of the orders placed by the customers, as the shipment travels from one location to another. This was done by continuously sending messages to JMS Queue.
- Alerting about any unusual events like shipment getting delayed and then sending email to customer.
- If the delivery is reached its destination, sending a delivery event.
We had multiple also implemented remote clients connected to main Server. If connection is available, they use to access the main database or if not use their own database. In order to handle data consistency, we had implemented 2PC mechanism.
For this, we used JMS for exchange the messages between these systems i.e one acting as coordinator who will initiate the process by sending message on the queue and others will respond accordingly by sending back again a message on the queue.
As others have already mentioned, this was similar to pub/sub model.
