May 2009
Intermediate to advanced
330 pages
10h 34m
English
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Dead Message Queues
JMS provides mechanisms for guaranteed delivery of messages between clients, utilizing the mechanisms we have discussed in this chapter. However, there are cases where guaranteed delivery, acknowledgments, and transactional semantics are just not enough. Many conditions may cause a message to be undeliverable. Messages may expire before they reach their intended destination or messages are viewed by the provider as undeliverable due to some other reason such as a deployment configuration problem. A message need not have an expiration associated with it, which means it would never expire. Forever is a long time. Realistically, it would be more prudent if the JMS provider could notify an application if a message cannot be delivered within a reasonable amount of time.
Although these issues are not specifically addressed by the JMS specification, some messaging vendors have the notion of a “Dead Letter Queue” or “Dead Message Queue” to deal with messages that are deemed undeliverable.
The extent of Dead Message Queue (DMQ) support varies from vendor to vendor. In the simplest case, it is the responsibility of the messaging system to put all undeliverable messages in the DMQ and it is the responsibility of the application to monitor its contents. In addition, a JMS provider may support administrative events that notify the application when something is placed in the DMQ. The notification may go to the sender or it may go to a centralized management tool. A specialized ...
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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.