61 lines
3.0 KiB
HTML
61 lines
3.0 KiB
HTML
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<html>
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<head>
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<title>ActiveMQ Artemis Static Message 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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<h1>Static Message 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 configure a ActiveMQ Artemis queue with static message selectors (filters)
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(to configure a static selector directly on a <em>JMS</em> queue, please see the
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<a href="../static-selector-jms/readme.html">static-selector-jms example</a>).</p>
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<p>Static message selectors are ActiveMQ's extension to message selectors as defined in JMS spec 1.1.
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Rather than specifying the selector in the application code, static message selectors are defined in one of
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ActiveMQ's configuration files, broker.xml, as an element called 'filter' inside each queue
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definition, like</p>
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<pre class="prettyprint"><code>
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<queues>
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<queue name="jms.queue.selectorQueue">
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<address>jms.queue.selectorQueue</address>
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<filter string="color='red'"/>
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</queue>
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</queues>
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</code></pre>
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<p>Once configured the queue 'selectorQueue' only delivers messages that are selected against the filter, i.e.,
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only the messages whose 'color' properties are of 'red' values can be received by its consumers. Those that don't match
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the filter will be dropped by the queue and therefore will never be delivered to any of its consumers.</p>
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<p>In the example code, five messages with different 'color' property values are sent to queue 'selectorQueue'. One consumer
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is created to receive messages from the queue. Of the five sent messages, two are of 'red' color properties, one is 'blue',
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one is 'green' and one has not the 'color' property at all. The result is that the consumer only gets the two 'red' messages.</p>
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</body>
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</html>
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