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| <h1>Redelivery Policy</h1> |
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| <p><a href="features">Features</a> > <a href="consumer-features">Consumer Features</a> > <a href="redelivery-policy">Redelivery Policy</a></p> |
| |
| <h2 id="redelivery-policy">Redelivery Policy</h2> |
| |
| <p>Detail on when messages are redelivered to a client can be found in the <a href="message-redelivery-and-dlq-handling">Message Redelivery and DLQ Handling</a> section. You can configure the <a href="http://svn.apache.org/viewvc/activemq/trunk/activemq-client/src/main/java/org/apache/activemq/RedeliveryPolicy.java?view=markup">RedeliveryPolicy</a> on your <a href="http://svn.apache.org/viewvc/activemq/trunk/activemq-client/src/main/java/org/apache/activemq/ActiveMQConnectionFactory.java?view=markup">ActiveMQConnectionFactory</a> or <a href="http://svn.apache.org/viewvc/activemq/trunk/activemq-client/src/main/java/org/apache/activemq/ActiveMQConnection.java?view=markup">ActiveMQConnection</a> to customize exactly how you want the redelivery to work.</p> |
| |
| <p>You can use Java code, Spring or the <a href="connection-configuration-uri">Connection Configuration URI</a> to customize this.</p> |
| |
| <h3 id="available-properties">Available Properties</h3> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>Property</th> |
| <th>Default Value</th> |
| <th>Description</th> |
| </tr> |
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| <tbody> |
| <tr> |
| <td><code class="highlighter-rouge">backOffMultiplier</code></td> |
| <td><code class="highlighter-rouge">5</code></td> |
| <td>The back-off multiplier.</td> |
| </tr> |
| <tr> |
| <td><code class="highlighter-rouge">collisionAvoidanceFactor</code></td> |
| <td><code class="highlighter-rouge">0.15</code></td> |
| <td>The percentage of range of collision avoidance if enabled.</td> |
| </tr> |
| <tr> |
| <td><code class="highlighter-rouge">initialRedeliveryDelay</code></td> |
| <td><code class="highlighter-rouge">1000L</code></td> |
| <td>The initial redelivery delay in milliseconds.</td> |
| </tr> |
| <tr> |
| <td><code class="highlighter-rouge">maximumRedeliveries</code></td> |
| <td><code class="highlighter-rouge">6</code></td> |
| <td>Sets the maximum number of times a message will be redelivered before it is considered a <strong>poisoned pill</strong> and returned to the broker so it can go to a Dead Letter Queue. Set to <code class="highlighter-rouge">-1</code> for unlimited redeliveries.</td> |
| </tr> |
| <tr> |
| <td><code class="highlighter-rouge">maximumRedeliveryDelay</code></td> |
| <td><code class="highlighter-rouge">-1</code></td> |
| <td>Sets the maximum delivery delay that will be applied if the <code class="highlighter-rouge">useExponentialBackOff</code> option is set. (use value <code class="highlighter-rouge">-1</code> to define that no maximum be applied) (v5.5).</td> |
| </tr> |
| <tr> |
| <td><code class="highlighter-rouge">redeliveryDelay</code></td> |
| <td><code class="highlighter-rouge">1000L</code></td> |
| <td>The delivery delay if <code class="highlighter-rouge">initialRedeliveryDelay=0</code> (v5.4).</td> |
| </tr> |
| <tr> |
| <td><code class="highlighter-rouge">useCollisionAvoidance</code></td> |
| <td><code class="highlighter-rouge">false</code></td> |
| <td>Should the redelivery policy use collision avoidance.</td> |
| </tr> |
| <tr> |
| <td><code class="highlighter-rouge">useExponentialBackOff</code></td> |
| <td><code class="highlighter-rouge">false</code></td> |
| <td>Should exponential back-off be used, i.e., to exponentially increase the timeout.</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h2 id="redeliverypolicy-per-destination">RedeliveryPolicy per Destination</h2> |
| |
| <p>As of ActiveMQ v5.7.0 you can now configure a <a href="http://svn.apache.org/viewvc/activemq/trunk/activemq-client/src/main/java/org/apache/activemq/RedeliveryPolicy.java?view=markup">RedeliveryPolicy</a> on a per-destination bases. The <code class="highlighter-rouge">ActiveMQConnection</code> factory class now exposes a <a href="http://svn.apache.org/viewvc/activemq/trunk/activemq-client/src/main/java/org/apache/activemq/broker/region/policy/RedeliveryPolicyMap.java?view=markup">RedeliveryPolicyMap</a> property that allows to assign a RedeliveryPolicy using named destinations or using destination wildcards. The code snipped below shows how to configure a different <a href="http://svn.apache.org/viewvc/activemq/trunk/activemq-client/src/main/java/org/apache/activemq/RedeliveryPolicy.java?view=markup">RedeliveryPolicy</a> for Topics and Queues.</p> |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>ActiveMQConnection connection ... // Create a connection |
| |
| RedeliveryPolicy queuePolicy = new RedeliveryPolicy(); |
| queuePolicy.setInitialRedeliveryDelay(0); |
| queuePolicy.setRedeliveryDelay(1000); |
| queuePolicy.setUseExponentialBackOff(false); |
| queuePolicy.setMaximumRedeliveries(2); |
| |
| RedeliveryPolicy topicPolicy = new RedeliveryPolicy(); |
| topicPolicy.setInitialRedeliveryDelay(0); |
| topicPolicy.setRedeliveryDelay(1000); |
| topicPolicy.setUseExponentialBackOff(false); |
| topicPolicy.setMaximumRedeliveries(3); |
| |
| // Receive a message with the JMS API |
| RedeliveryPolicyMap map = connection.getRedeliveryPolicyMap(); |
| map.put(new ActiveMQTopic(">"), topicPolicy); |
| map.put(new ActiveMQQueue(">"), queuePolicy); |
| </code></pre></div></div> |
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