137 lines
7.0 KiB
HTML
137 lines
7.0 KiB
HTML
<html>
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<head>
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<title>ActiveMQ Client Kickoff 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>Client Kickoff Example</h1>
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<p>This example shows how to kick off a client connected to ActiveMQ
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using <a href="http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/">JMX</a></p>
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<p>The example will connect to ActiveMQ. Using JMX, we will list the remote addresses connected to the
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server and close the corresponding connections. The client will be kicked off from ActiveMQ receiving
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an exception that its JMS connection was interrupted.</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).</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="src/main/resources/activemq/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 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 set a <code>ExceptionListener</code> on the connection to be notified after a problem occurred</li>
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<pre class="prettyprint">
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<code>final AtomicReference<JMSException> exception = new AtomicReference<JMSException>();
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connection.setExceptionListener(new ExceptionListener()
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{
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public void onException(JMSException e)
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{
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exception.set(e);
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}
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});</code>
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</pre>
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<li>We start the connection</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 create a MBean proxy to the ActiveMQServerControlMBean used to manage ActiveMQ server
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(see <a href="../jmx/readme.html">JMX example</a> for a complete explanation of the different steps)</li>
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<pre class="prettyprint">
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<code>ObjectName on = ObjectNameBuilder.DEFAULT.getActiveMQServerObjectName();
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JMXConnector connector = JMXConnectorFactory.connect(new JMXServiceURL(JMX_URL), new HashMap<String, String>());
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MBeanServerConnection mbsc = connector.getMBeanServerConnection();
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ActiveMQServerControlMBean serverControl = (ActiveMQServerControlMBean)MBeanServerInvocationHandler.newProxyInstance(mbsc,
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on,
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ActiveMQServerControlMBean.class,
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false);
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</code>
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</pre>
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<li>Using the server MBean, we list the remote address connected to the server</li>
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<pre class="prettyprint">
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<code>String[] remoteAddresses = serverControl.listRemoteAddresses();
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for (String remoteAddress : remoteAddresses)
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{
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System.out.println(remoteAddress);
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}
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</code>
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</pre>
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<p>It will display a single address corresponding to the connection opened at step 3.</p>
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<li>We close the connections corresponding to this remote address</li>
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<pre class="prettyprint">
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<code>serverControl.closeConnectionsForAddress(remoteAddresses[0]);</code>
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</pre>
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<p>Warnings be displayed on the server output:</p>
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<pre class="prettyprint">
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<code>org.apache.activemq.jms.example.SpawnedJMSServer out:11:22:33,034 WARN @RMI TCP Connection(3)-192.168.0.10 [RemotingConnectionImpl] Connection failure has been detected connections for /192.168.0.10:52707 closed by management:0
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org.apache.activemq.jms.example.SpawnedJMSServer out:11:22:33,035 WARN @RMI TCP Connection(3)-192.168.0.10 [ServerSessionImpl] Client connection failed, clearing up resources for session 4646da35-2fe8-11de-9ce9-752ccc2b26e4
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org.apache.activemq.jms.example.SpawnedJMSServer out:11:22:33,035 WARN @RMI TCP Connection(3)-192.168.0.10 [ServerSessionImpl] Cleared up resources for session 4646da35-2fe8-11de-9ce9-752ccc2b26e4
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</code>
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</pre>
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<li>We display the exception received by the connection's ExceptionListener</li>
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<pre class="prettyprint">
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<code>exception.get().printStackTrace();</code>
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</pre>
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<p>When the connection was closed on the server-side by the call to <code>serverControl.closeConnectionsForAddress()</code>,
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the client's connection was disconnected and its exception listener was notified.</p>
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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><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> |