2014-10-31 06:20:28 -04:00
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2014-11-19 03:44:57 -05:00
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<title>ActiveMQ JMS Message Consumer Rate Limiting</title>
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2014-10-31 06:20:28 -04:00
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<link rel="stylesheet" type="text/css" href="../common/common.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>JMS Message Consumer Rate Limiting</h1>
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2014-11-19 03:44:57 -05:00
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<p>With ActiveMQ you can specify a maximum consume rate at which a JMS MessageConsumer will consume messages.
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2014-10-31 06:20:28 -04:00
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This can be specified when creating or deploying the connection factory. See <code>hornetq-jms.xml</code></p>
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2014-11-19 03:44:57 -05:00
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<p>If this value is specified then ActiveMQ will ensure that messages are never consumed at a rate higher than
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2014-10-31 06:20:28 -04:00
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the specified rate. This is a form of consumer <i>throttling</i>.</p>
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<h2>Example step-by-step</h2>
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<p>In this example we specify a <code>consumer-max-rate</code> of <code>10</code> messages per second in the <code>hornetq-jms.xml</code>
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file when deploying the connection factory:</p>
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<pre class="prettyprint">
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<code>
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<connection-factory name="ConnectionFactory">
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<connector-ref connector-name="netty-connector"/>
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<entries>
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<entry name="ConnectionFactory"/>
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</entries>
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<!-- We limit consumers created on this connection factory to consume messages at a maximum rate
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of 10 messages per sec -->
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<consumer-max-rate>50</producer-max-rate>
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</connection-factory>
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</code>
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</pre>
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<p>We then simply consume as many messages as we can in 10 seconds and note how many messages are actually consumed.</p>
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<p>We note that the number of messages consumed per second never exceeds the specified value of <code>10</code> messages per second.</p>
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<p><i>To run the example, simply type <code>mvn verify</code> from this directory</i></p>
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<ol>
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<li>Create an initial context to perform the JNDI lookup.</li>
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<pre class="prettyprint">
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<code>initialContext = getContext(0);</code>
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</pre>
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<li>Perfom a lookup on the queue</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>Perform a lookup on the Connection Factory</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>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>Create a JMS Session</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>Create a JMS MessageProducer</li>
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<pre class="prettyprint">
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<code>MessageProducer producer = session.createProducer(queue);</code>
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</pre>
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<li>Create a JMS MessageConsumer</li>
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<pre class="prettyprint">
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<code>MessageConsumer consumer = session.createConsumer(queue);</code>
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</pre>
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<li>Start the connection</li>
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<pre class="prettyprint">
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<code>
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connection.start();
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</code>
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</pre>
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<li>Send a bunch of messages</li>
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<pre class="prettyprint">
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<code>
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final int numMessages = 150;
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for (int i = 0; i < numMessages; i++)
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{
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TextMessage message = session.createTextMessage("This is text message: " + i);
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producer.send(message);
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}
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</code>
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</pre>
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<li>Consume as many messages as we can in 10 seconds</li>
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<pre class="prettyprint">
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<code>
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final long duration = 10000;
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int i = 0;
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long start = System.currentTimeMillis();
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while (System.currentTimeMillis() - start <= duration)
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{
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TextMessage message = (TextMessage)consumer.receive(2000);
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if (message == null)
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{
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return false;
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}
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i++;
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}
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long end = System.currentTimeMillis();
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double rate = 1000 * (double)i / (end - start);
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System.out.println("We consumed " + i + " messages in " + (end - start) + " milliseconds");
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System.out.println("Actual consume rate was " + rate + " messages per second");
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</code>
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</pre>
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<li>This should produce output something like:</li>
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<pre class="prettyprint">
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<code>
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[java] Sent messages
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[java] Will now try and consume as many as we can in 10 seconds ...
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[java] We consumed 100 messages in 10001 milliseconds
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[java] Actual consume rate was 9.99900009999 messages per second
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</code>
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</pre>
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<li>Be sure to close our resources!</li>
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<pre class="prettyprint">
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<code>
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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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</body>
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</html>
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