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| <html> |
| <head> |
| <title>ActiveMQ Artemis JMX Management Example</title> |
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| <h1>JMX Management Example</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 how to manage ActiveMQ Artemis using <a href="http://java.sun.com/javase/technologies/core/mntr-mgmt/javamanagement/">JMX</a></p> |
| |
| <h2>Example configuration</h2> |
| |
| <p>ActiveMQ Artemis exposes its managed resources by default on the platform MBeanServer.</p> |
| <p>To access this MBeanServer remotely, the Java Virtual machine must be started with system properties: |
| <pre class="prettyprint"> |
| <code>-Dcom.sun.management.jmxremote |
| -Dcom.sun.management.jmxremote.port=3000 |
| -Dcom.sun.management.jmxremote.ssl=false |
| -Dcom.sun.management.jmxremote.authenticate=false</code> |
| </pre> |
| <p>These properties are explained in the Java <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/management/agent.html#gdenl">management guide</a> |
| (please note that for this example, we will disable user authentication for simplicity sake).</p> |
| <p>With these properties, ActiveMQ Artemis server will be manageable remotely using standard JMX URL on port <code>3000</code>.</p> |
| </p> |
| |
| <h2>Example step-by-step</h2> |
| <ol> |
| <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> |
| <pre class="prettyprint"> |
| <code>InitialContext initialContext = getContext(0);</code> |
| </pre> |
| |
| <li>We look up the JMS queue object from JNDI</li> |
| <pre class="prettyprint"> |
| <code>Queue queue = (Queue) initialContext.lookup("/queue/exampleQueue");</code> |
| </pre> |
| |
| <li>We look up the JMS connection factory object from JNDI</li> |
| <pre class="prettyprint"> |
| <code>ConnectionFactory cf = (ConnectionFactory) initialContext.lookup("/ConnectionFactory");</code> |
| </pre> |
| |
| <li>We create a JMS connection</li> |
| <pre class="prettyprint"> |
| <code>connection = cf.createConnection();</code> |
| </pre> |
| |
| <li>We create a JMS session. The session is created as non transacted and will auto acknowledge messages.</li> |
| <pre class="prettyprint"> |
| <code>Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);</code> |
| </pre> |
| |
| <li>We create a JMS message producer on the session. This will be used to send the messages.</li> |
| <pre class="prettyprint"> |
| <code>MessageProducer messageProducer = session.createProducer(topic);</code> |
| </pre> |
| |
| <li>We create a JMS text message that we are going to send.</li> |
| <pre class="prettyprint"> |
| <code>TextMessage message = session.createTextMessage("This is a text message");</code> |
| </pre> |
| |
| <li>We send message to the queue</li> |
| <pre class="prettyprint"> |
| <code>messageProducer.send(message);</code> |
| </pre> |
| |
| <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 |
| (i.e. 1) and by removing the message which has been sent in step 8.</em></p> |
| |
| <li>We retrieve the <code>ObjectName</code> corresponding to the queue using a helper class <code>ObjectNameBuilder</code></li> |
| <pre class="prettyprint"> |
| <code>ObjectName on = ObjectNameBuilder.DEFAULT.getJMSQueueObjectName(queue.getQueueName());</code> |
| </pre> |
| |
| <li>We create a JMX Connector to connect to the server's MBeanServer using the <a href="http://docs.oracle.com/javase/8/docs/technotes/guides/management/agent.html#gdevg">standard JMX service URL</a></li> |
| <pre class="prettyprint"> |
| <code>JMXConnector connector = JMXConnectorFactory.connect(new JMXServiceURL(JMX_URL), new HashMap());</code> |
| </pre> |
| |
| <li>We retrieve a <code>MBeanServerConnection</code> from the JMX connector</li> |
| <pre class="prettyprint"> |
| <code>TextMessage messageReceived = (TextMessage) messageConsumer.receive(5000);</code> |
| </pre> |
| |
| <li>We create a <code>JMSQueueControl</code> proxy to manage the queue on the server</li> |
| <pre class="prettyprint"> |
| <code>JMSQueueControl queueControl = (JMSQueueControl)MBeanServerInvocationHandler.newProxyInstance(mbsc, |
| on, |
| JMSQueueControl.class, |
| false); |
| </code> |
| </pre> |
| |
| <li>We use this mbean proxy to retrieve the number of messages in the queue using the <code>getMessageCount</code> method</li> |
| <pre class="prettyprint"> |
| <code>System.out.println(queueControl.getName() + " contains " + queueControl.getMessageCount() + " messages");</code> |
| </pre> |
| |
| <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> |
| <pre class="prettyprint"> |
| <code>System.out.println("message has been removed: " + queueControl.removeMessage(message.getJMSMessageID()));</code> |
| </pre> |
| |
| <li>We use again the mbean proxy to retrieve the number of messages. This time, it will display <code>0</code> messages</li> |
| <pre class="prettyprint"> |
| <code>System.out.println(queueControl.getName() + " contains " + queueControl.getMessageCount() + " messages");</code> |
| </pre> |
| |
| <li>Now we have finish the management operations, we close the JMX connector</li> |
| <pre class="prettyprint"> |
| <code>connector.close()</code> |
| </pre> |
| |
| <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> |
| |
| <li>We create a JMS message consumer on the queue</li> |
| <pre class="prettyprint"> |
| <code>MessageConsumer messageConsumer = session.createConsumer(queue);</code> |
| </pre> |
| |
| <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> |
| <pre class="prettyprint"> |
| <code>connection.start();</code> |
| </pre> |
| |
| <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 |
| </li> |
| <pre class="prettyprint"> |
| <code>TextMessage messageReceived = (TextMessage) messageConsumer.receive(5000); |
| System.out.println("Received message: " + messageReceived);</code> |
| </pre> |
| |
| <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> |
| |
| <pre class="prettyprint"> |
| <code>finally |
| { |
| if (initialContext != null) |
| { |
| initialContext.close(); |
| } |
| if (connection != null) |
| { |
| connection.close(); |
| } |
| }</code> |
| </pre> |
| </ol> |
| |
| <h2>More information</h2> |
| |
| <ul> |
| <li>User Manual's <a href="../../../docs/user-manual/en/html_single/index.html#management.jmx">Using Management Via JMX chapter</a></li> |
| <li><a href="http://docs.oracle.com/javase/8/docs/technotes/guides/management/agent.html">Java management guide</a></li> |
| </ul> |
| </body> |
| </html> |