Special Edition Using Enterprise JavaBeans™ 2.0

Using the JMS Publish/Subscribe Model

Now we are going to look at an example of implementing the notification functionality using the Pub/Sub model. Although this example might seem like a stretch to require the Pub/Sub model, it will give you an idea of the differences between the two and what must be done differently for each model. Actually, there might even be a need for this design over the PTP model based on performing different tasks for different subscribers, so it might not be that much of a stretch.

As stated earlier, the Pub/Sub model in JMS involves using a topic as the destination rather than a queue. For this example, we are going to have two subscribers to the topic. One will be the handler that generates an e-mail message to ...