February 2004
Intermediate to advanced
848 pages
27h 25m
English
Content preview from WebLogic: The Definitive GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Controlling Message Delivery
WebLogic provides a number of features that can be used to control the different aspects of message delivery and handling. These features are critical in building a robust and scalable messaging system.
The timed message delivery feature lets you control exactly when messages are delivered. Using this mechanism, you can either configure a delay before the message is actually delivered, or set up a custom schedule for a destination that determines the permitted days and times during which the messages may be delivered. In this way, you can ensure that messages are delivered only when their consumers are ready to process them. The time-to-live attribute lets you adjust the maximum age of the outgoing messages — i.e., the maximum time period for which the messages will be retained by the system. After this time period, the messages will have expired and will no longer be tracked by the JMS server. The previous section showed how WebLogic can periodically reap expired messages from the JMS server.
WebLogic also provides enhanced support for redelivery by letting you
limit the number of attempts at redelivery and configure a pause
between redelivery attempts. WebLogic JMS makes two additional
acknowledge modes available. The NO_ACKNOWLEDGE
mode instructs the JMS server to not expect acknowledgment for the
message. The MULTICAST_NO_ACKNOWLEDGE mode is similar, except that it enables the JMS client to use a more scalable multicast message distribution when ...
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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.
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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.