darren rose:
Looking for examples using ESB with Liferay 6.2 CE. That's Service Bus examples.
You have to think a lot about how you're using the ESB and the challenges you're going to face trying to solve them.
For example, I had some portlets that would drop messages at the user's bequest into an ActiveMQ queue and a remote camel process would send back replies.
The challenge was that the portal couldn't just sit and wait for a response (it was a remote async process). So I set up a LMB endpoint for each user and a spring MDB to receive messages from the response queue and would push into the LMB for the user. It at least allowed me to route messages back to the user and those would sit in the LMB until the user submitted some portal request so I could update the view with the results.
It gets hairy when a user can be logged in more than once (how then do you deliver messages in that scenario?).
ESBs and the like work well for internal enterprise systems where messages can be delivered and processed asynchronously. The submission and display from a user on a portal, however, well that's a completely different sort of process so you face challenges trying to bind them all together correctly.
And the reason you're not finding any examples is that most of the time everyone's process or implementation will be different. Sometimes you just need to send a message and not worry about a response. Sometimes you want to wait a few secs for a response to display directly or just time out and discard the response.
