activemq-artemis/examples/jms/queue
Clebert Suconic f509c075c6 ACTIVEMQ6-1 Artemis rename
This commit is a simple mv of the files.. We required two commits to preserve history,
one to git mv, one for the actual changes...

otherwise history would be lost

Based on the Apache ActiveMQ community vote this project is being
renamed "Artemis."
2015-04-27 17:44:45 -04:00
..
src/main ACTIVEMQ6-1 Artemis rename 2015-04-27 17:44:45 -04:00
pom.xml Renamed ActiveMQ6 to ActiveMQ Artemis 2015-04-24 14:07:31 +01:00
readme.html added examples to release profile 2015-03-08 13:34:02 +00:00

readme.html

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<html>
  <head>
    <title>ActiveMQ JMS Queue Example</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>
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  <body onload="prettyPrint()">
     <h1>JMS Queue Example</h1>

     <p>This example shows you how to send and receive a message to a JMS Queue using ActiveMQ.</p>
     <p>Queues are a standard part of JMS, please consult the JMS 1.1 specification for full details.</p>
     <p>A Queue is used to send messages point to point, from a producer to a consumer. The queue guarantees message ordering between these 2 points.</p>

     <h2>Example step-by-step</h2>
     <p><i>To run the example, simply type <code>mvn verify -Pexample</code> from this directory</i></p>

     <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 it's properties from the <code>client-jndi.properties</code> file in the directory <code>../common/config</code></li>
        <pre class="prettyprint">
           <code>InitialContext initialContext = getContext();</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>

        <li>We create a JMS Message Consumer to receive the message.</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>The message arrives at the consumer. In this case we use a timeout of 5000 milliseconds but we could use a blocking 'receive()'</li>
        <pre class="prettyprint">
           <code>TextMessage messageReceived = (TextMessage) messageConsumer.receive(5000);</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>
  </body>
</html>