181 lines
8.9 KiB
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181 lines
8.9 KiB
HTML
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<html>
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<head>
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<title>ActiveMQ JMX Management 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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</head>
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<body onload="prettyPrint()">
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<h1>JMX Management Example</h1>
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<p>This example shows how to manage ActiveMQ using <a href="http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/">JMX</a></p>
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<h2>Example configuration</h2>
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<p>ActiveMQ exposes its managed resources by default on the platform MBeanServer.</p>
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<p>To access this MBeanServer remotely, the Java Virtual machine must be started with system properties:
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<pre class="prettyprint">
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<code>-Dcom.sun.management.jmxremote
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-Dcom.sun.management.jmxremote.port=3000
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-Dcom.sun.management.jmxremote.ssl=false
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-Dcom.sun.management.jmxremote.authenticate=false</code>
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</pre>
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<p>These properties are explained in the Java 5 <a href="http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html#remote">Management guide</a>
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(please note that for this example, we will disable user authentication for simplicity sake).</p>
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<p>With these properties, ActiveMQ server will be manageable remotely using standard JMX URL on port <code>3000</code>.</p>
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</p>
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<h2>Example step-by-step</h2>
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<p><em>To run the example, simply type <code>mvn verify</code> from this directory</em></p>
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<ol>
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<li>First we need to get an initial context so we can look-up the JMS connection factory and destination objects from JNDI. This initial context will get its properties from <a href="server0/client-jndi.properties">client-jndi.properties</a></li>
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<pre class="prettyprint">
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<code>InitialContext initialContext = getContext(0);</code>
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</pre>
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<li>We look up the JMS queue object from JNDI</li>
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<pre class="prettyprint">
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<code>Queue queue = (Queue) initialContext.lookup("/queue/exampleQueue");</code>
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</pre>
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<li>We look up the JMS connection factory object from JNDI</li>
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<pre class="prettyprint">
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<code>ConnectionFactory cf = (ConnectionFactory) initialContext.lookup("/ConnectionFactory");</code>
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</pre>
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<li>We create a JMS connection</li>
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<pre class="prettyprint">
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<code>connection = cf.createConnection();</code>
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</pre>
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<li>We create a JMS session. The session is created as non transacted and will auto acknowledge messages.</li>
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<pre class="prettyprint">
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<code>Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);</code>
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</pre>
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<li>We create a JMS message producer on the session. This will be used to send the messages.</li>
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<pre class="prettyprint">
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<code>MessageProducer messageProducer = session.createProducer(topic);</code>
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</pre>
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<li>We create a JMS text message that we are going to send.</li>
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<pre class="prettyprint">
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<code>TextMessage message = session.createTextMessage("This is a text message");</code>
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</pre>
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<li>We send message to the queue</li>
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<pre class="prettyprint">
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<code>messageProducer.send(message);</code>
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</pre>
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<p><em>Now that we have a message in the queue, we will manage the queue by retrieving the number of messages in the queue
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(i.e. 1) and by removing the message which has been sent in step 8.</em></p>
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<li>We retrieve the <code>ObjectName</code> corresponding to the queue using a helper class <code>ObjectNameBuilder</code></li>
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<pre class="prettyprint">
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<code>ObjectName on = ObjectNameBuilder.DEFAULT.getJMSQueueObjectName(queue.getQueueName());</code>
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</pre>
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<li>We create a JMX Connector to connect to the server's MBeanServer using the <a href="http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html#connecting">standard JMX service URL</a></li>
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<pre class="prettyprint">
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<code>JMXConnector connector = JMXConnectorFactory.connect(new JMXServiceURL(JMX_URL), new HashMap());</code>
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</pre>
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<li>We retrieve a <code>MBeanServerConnection</code> from the JMX connector</li>
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<pre class="prettyprint">
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<code>TextMessage messageReceived = (TextMessage) messageConsumer.receive(5000);</code>
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</pre>
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<li>We create a <code>JMSQueueControl</code> proxy to manage the queue on the server</li>
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<pre class="prettyprint">
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<code>JMSQueueControl queueControl = (JMSQueueControl)MBeanServerInvocationHandler.newProxyInstance(mbsc,
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on,
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JMSQueueControl.class,
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false);
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</code>
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</pre>
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<li>We use this mbean proxy to retrieve the number of messages in the queue using the <code>getMessageCount</code> method</li>
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<pre class="prettyprint">
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<code>System.out.println(queueControl.getName() + " contains " + queueControl.getMessageCount() + " messages");</code>
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</pre>
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<li>We will now remove the message sent at step 8 using the <code>removeMessage</code> method with the JMS Message ID of the message</li>
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<pre class="prettyprint">
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<code>System.out.println("message has been removed: " + queueControl.removeMessage(message.getJMSMessageID()));</code>
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</pre>
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<li>We use again the mbean proxy to retrieve the number of messages. This time, it will display <code>0</code> messages</li>
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<pre class="prettyprint">
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<code>System.out.println(queueControl.getName() + " contains " + queueControl.getMessageCount() + " messages");</code>
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</pre>
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<li>Now we have finish the management operations, we close the JMX connector</li>
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<pre class="prettyprint">
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<code>connector.close()</code>
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</pre>
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<p><em>We will now try to consume the message sent to the queue but it won't be there: it has been removed by the management operation</em></p>
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<li>We create a JMS message consumer on the queue</li>
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<pre class="prettyprint">
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<code>MessageConsumer messageConsumer = session.createConsumer(queue);</code>
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</pre>
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<li>We start the connection. In order for delivery to occur on any consumers or subscribers on a connection, the connection must be started</li>
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<pre class="prettyprint">
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<code>connection.start();</code>
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</pre>
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<li>We try to receive a message from the queue. Since there is none, the call will timeout after 5000ms and messageReceived will be null
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</li>
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<pre class="prettyprint">
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<code>TextMessage messageReceived = (TextMessage) messageConsumer.receive(5000);
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System.out.println("Received message: " + messageReceived);</code>
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</pre>
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<li>And finally, <b>always</b> remember to close your JMS connections and resources after use, in a <code>finally</code> block. Closing a JMS connection will automatically close all of its sessions, consumers, producer and browser objects</li>
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<pre class="prettyprint">
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<code>finally
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{
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if (initialContext != null)
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{
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initialContext.close();
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}
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if (connection != null)
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{
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connection.close();
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}
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}</code>
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</pre>
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</ol>
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<h2>More information</h2>
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<ul>
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<li>User Manual's <a href="../../../docs/user-manual/en/html_single/index.html#management.jmx">Using Management Via JMX chapter</a></li>
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<li><a href="http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html">Java 5 Management guide</a></li>
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</ul>
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</body>
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</html>
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