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| Apache ActiveMQ ™ -- Selectors |
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| <div class="wiki-content maincontent"><h2 id="Selectors-JMSSelectors">JMS Selectors</h2> |
| |
| <p>Selectors are a way of attaching a filter to a subscription to perform content based routing. Selectors are defined using SQL 92 syntax and typically apply to message headers; whether the standard properties available on a JMS message or custom headers you can add via the JMS code.</p> |
| |
| <p>Here is an example</p> |
| |
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| <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;"> |
| JMSType = 'car' AND color = 'blue' AND weight > 2500 |
| </pre> |
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| |
| <p>For more documentation on the detail of selectors see the reference on <a shape="rect" class="external-link" href="http://java.sun.com/j2ee/1.4/docs/api/javax/jms/Message.html" rel="nofollow">javax.jmx.Message</a>. <br clear="none"> |
| ActiveMQ supports some JMS defined properties, as well as some ActiveMQ ones - see <a shape="rect" href="activemq-message-properties.html">message properies </a> - that the selector can use.</p> |
| |
| <h3 id="Selectors-UsingXPathtofiltermessages">Using XPath to filter messages</h3> |
| |
| <p>Apache ActiveMQ also supports XPath based selectors when working with messages containing XML bodies. To use an XPath selector use the following syntax</p> |
| |
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| <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;"> |
| XPATH '//title[@lang=''eng'']' |
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| |
| <div class="confluence-information-macro confluence-information-macro-tip"><p class="title">Xalan dependency</p><span class="aui-icon aui-icon-small aui-iconfont-approve confluence-information-macro-icon"></span><div class="confluence-information-macro-body"> |
| <p>XPath support requires <a shape="rect" class="external-link" href="http://xalan.apache.org/index.html">Xalan</a> which is not part of the distribution. The Xalan jars needs to be manually added to lib directory or pulled into your app via maven </p> |
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| <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;"><dependency> |
| <groupId>xalan</groupId> |
| <artifactId>xalan</artifactId> |
| <version>2.6.0</version> |
| </dependency></pre> |
| </div></div></div></div> |
| |
| <h3 id="Selectors-StringPropertyConversions/SelectingAgainstSTOMPmessages">String Property Conversions / Selecting Against STOMP messages</h3> |
| |
| <p>The JMS spec states that a String property should not get converted to a numeric when used in a selector. So for example, if a message has the 'age' property set to String '21' then the following selector should not match it: 'age > 18'. Since ActiveMQ support STOMP client which can only send messages with string properties, that restriction is a bit limiting. If you want your JMS selectors to auto-convert String properties the the appropriate number type, just prefix the the selector with 'convert_string_expressions:'. If you changed selector in the previous example to be 'convert_string_expressions:age > 18', then it would match the message.</p></div> |
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