Tag Archives: async

Decoupling event producers and event consumers in Java EE 6 using CDI and JMS

In this post I will show you how to decouple event producer from the event consumers (aka async events).

  1. you must configure your application server (here the glassfish settings):
  2. call the EJB method sendEvent() to send the event (from a servlet or from a web page):
  3. the EJB fires the event anotaded with @InForeground qualifier.
  4. An observer method handle the event and send it to the JMS Queue with the help of a message producer:
  5. Now, in another (background) thread, the onMessage method handle the message and fires a new event (which wraps the received event) now annotated with @InBackground qualifier:
  6. And finally, if you have a method that consumes events annotated with @InBackground qualifier, then you receive the event and process it accordingly to your business needs.

The event object it’s just a POJO like this one:

You can get the full code from github. Thank you!

Feel free to comment.