53 lines
3.0 KiB
HTML
53 lines
3.0 KiB
HTML
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<html>
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<head>
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<title>ActiveMQ Artemis JMS Queue Selector Example</title>
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<link rel="stylesheet" type="text/css" href="../../../common/common.css" />
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<link rel="stylesheet" type="text/css" href="../../../common/prettify.css" />
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<script type="text/javascript" src="../../../common/prettify.js"></script>
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<body onload="prettyPrint()">
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<h1>JMS Queue Selector Example</h1>
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<pre>To run the example, simply type <b>mvn verify</b> from this directory, <br>or <b>mvn -PnoServer verify</b> if you want to start and create the server manually.</pre>
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<p>This example shows you how to selectively consume messages using message selectors with queue consumers.</p>
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<p>Message selectors are strings with special syntax that can be used in creating consumers. Message consumers
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created with a message selector will only receive messages that match its selector. On message delivery, the JBoss Message
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Server evaluates the corresponding message headers of the messages against each selector, if any, and then delivers
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the 'matched' messages to its consumer. Please consult the JMS 1.1 specification for full details.</p>
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<p>In this example, three message consumers are created on a queue. The first consumer is created with selector
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<code>'color=red'</code>, it only receives messages that
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have a 'color' string property of 'red' value; the second is created with selector <code>'color=green'</code>, it
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only receives messages who have a 'color' string property of
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'green' value; and the third without a selector, which means it receives all messages. To illustrate, three messages
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with different 'color' property values are created and sent.</p>
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<p>Selectors can be used with both queue consumers and topic consumers. The difference is that with queue consumers,
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a message is only delivered to one consumer on the queue, while topic consumers the message will be delivered to every
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matching consumers. In this example, if the third consumer (anyConsumer) were the first consumer created, it will
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consume the first message delivered, therefore there is no chance for the next consumer to get the message, even if it
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matches the selector.</p>
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</body>
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</html>
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