September 2003
Intermediate to advanced
368 pages
10h 16m
English
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Messaging in J2EE
Most discussions of messaging in the J2EE world focus on JMS, the Java Message Service API, which is a core component of the J2EE standard. JMS provides access to heavy-duty messaging software. A JMS-enabled application can take advantage of a range of services, such as delivery guarantees, quality of service contracts, and an easy-to-use Java interface.
The patterns in this chapter apply to JMS applications, but many of them can be used alongside another message transport mechanism: trusty old Internet email. Email has gotten relatively short shrift in most texts on enterprise software development, and we’re hard pressed to see why; it’s easy to use, and the infrastructure is nearly ubiquitous. There’s even a handy J2EE API, JavaMail, designed for dealing with it. We look at most of the patterns in this chapter through the lenses of both JMS and JavaMail. Of course, JavaMail and JMS are hardly equivalent, and we’ll point out some of the differences in the next few pages.
Asynchronous Messaging Versus Web Services
This chapter doesn’t cover message-oriented web services, partially because messaging is such a broad subject. If you think about it, most of what an application does can be cast in terms of messaging: method calls, for instance, are messages from one class to another, with immediate receipt and confirmation of delivery.
For our purposes, there’s one major difference between asynchronous messaging and web services: web services are synchronous. When you’re ...
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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.