September 2010
Intermediate to advanced
766 pages
18h 35m
English
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Appendix E. Message-Driven EJB: Status Update Listeners Example
Description
Session beans, as we’ve seen up to this point, are best suited for servicing client requests. Many enterprise systems, however, use a messaging layer to asynchronously pass requests from application to application. In Java, we use the Java Message Service abstraction to push/pull messages via Queues and Topics, and the integration of JMS with EJB is the message-driven bean.
In this example, we implement social networking status updates via a consumer/publisher Topic. Anyone listening on the Topic will receive incoming status updates, and we create 2 listeners: 1 simple one to log out to the command-line or logfile, and another to push the updates to Twitter.
Note: Set the environment variables below before running to take advantage of the Twitter updates while running the tests.
OREILLY_EJB_BOOK_CH08_TWITTER_USERNAME OREILLY_EJB_BOOK_CH08_TWITTER_PASSWORD
Additionally, in this example we show how the use of a single JVM
for the test and the server can be used to enable shared memory locking
(i.e., java.util.concurrent) to
reliably test that asynchronous components have completed as
expected.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.