activemq-artemis

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Martyn Taylor c40823e5ec [maven-release-plugin] prepare for next development iteration

2017-03-10 14:54:33 +00:00

src/main

ARTEMIS-785 - update examples to new addressing model

2016-12-15 13:36:23 +00:00

pom.xml

[maven-release-plugin] prepare for next development iteration

2017-03-10 14:54:33 +00:00

readme.html

renaming broker-features -> features on examples

2015-08-13 00:11:56 -04:00

readme.html

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<html>
  <head>
    <title>ActiveMQ Artemis Delayed Redelivery 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>
  </head>
  <body onload="prettyPrint()">
     <h1>Delayed Redelivery 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 demonstrates how ActiveMQ Artemis can be configured to provide a delayed redelivery in the case
     where a message needs to be redelivered.</p>
     <p>Delaying redelivery can often be useful in the case that clients regularly fail or roll-back. Without a delayed
     redelivery, the system can get into a "thrashing" state, with delivery being attempted, the client rolling back, and
     delivery being re-attempted ad infinitum in quick succession, using up valuable CPU and network resources.</p>
     <p>Re-delivery occurs when the session is closed with unacknowledged messages. The unacknowledged messages will
     be redelivered.</p>
     <p>By providing a redelivery delay, it can be specified that a delay of, say, 10 seconds is implemented between rollback
     and redelivery. The specific delay is configurable on both a global and per destination level, by using wild-card
     matching on the address settings.</p>

     <h2>Example setup</h2>
     <p>Redelivery delay is specified in the configuration file <a href="src/main/resources/activemq/server0/broker.xml">broker.xml</a>:</p>
     <p>In this example we set the redelivery delay to 5 seconds for the specific example queue. We could set redelivery delay on
     on multiple queues by specifying a wild-card in the match, e.g. <code>match="jms.#"</code> would apply the settings
     to all JMS queues and topics.</p>
     <p>We then consume a message in a transacted session, and rollback, and note that the message is not redelivered until
     after 5 seconds.</p>
     <pre class="prettyprint">
         <code>&lt;address-setting match="jms.queue.exampleQueue"&gt;
            &lt;redelivery-delay&gt;5000&lt;/redelivery-delay&gt;
         &lt;/address-setting&gt;
         </code>
     </pre>
  </body>
</html>