November 2005
Intermediate to advanced
896 pages
31h 5m
English
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Appendix E. JMS Message Selector Syntax
JMS message selectors are used by JMS clients to filter the
messages that a JMS server delivers to a given MessageConsumer. A message selector is
provided (optionally) when a MessageConsumer is created, using either the
QueueSession. createReceiver() or the
TopicSession.createSubscriber()
method.
A message selector is a string that specifies a predicate to be
applied to each message that the provider wants to deliver to a MessageConsumer. If the predicate evaluates to
true, then the message is delivered; if false, then the message is not
delivered. In point-to-point messaging, when messages are filtered out
by a message selector, the message will remain on the queue until the
client eventually reads it or the message times out and the server
removes it from the queue. In publish-subscribe messaging, messages that
are filtered are never delivered to the subscriber.
In this chapter, we provide the full syntax of JMS message selectors. For more details on using JMS in general, see the tutorial in Chapter 11.
Structure of a Selector
A message selector is made up of one or more Boolean expressions, joined together by logical operators and grouped using parentheses. For example:
(<expression1> OR <expression2> AND <expression3>) OR
(<expression4> AND NOT <expression5>) . . .A message selector is evaluated left to right in precedence
order. So in this example, expression2 will be evaluated followed by
expression3 (since AND has higher precedence than ...
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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.