<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<html>
<head>
<title>ActiveMQ Artemis JMS Topic Selector Example 2</title>
<link rel="stylesheet" type="text/css" href="../../../common/common.css" />
<link rel="stylesheet" type="text/css" href="../../../common/prettify.css" />
<script type="text/javascript" src="../../../common/prettify.js"></script>
</head>
<body onload="prettyPrint()">
<h1>JMS Topic Selector Example 2</h1>
<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>
<p>This example shows you how to selectively consume messages using message selectors with topic consumers.</p>
<p>Message selectors are strings with special syntax that can be used in creating consumers. Message consumers
that are thus created only receive messages that match its selector. On message delivering, the ActiveMQ
Server evaluates the corresponding message headers of the messages against each selector, if any, and then delivers
the 'matched' messages to its consumer. Please consult the JMS 1.1 specification for full details.</p>
<p>In this example, three message consumers are created on a topic. The first consumer is created with selector
<code>'color=red'</code>, it only receives messages that
have a 'color' string property of 'red' value; the second is created with selector <code>'color=green'</code>, it
only receives messages who have a 'color' string property of
'green' value; and the third without a selector, which means it receives all messages. To illustrate, three messages
with different 'color' property values are created and sent.</p>
</body>
</html>
8703d9d51d