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<title>ActiveMQ Artemis Clustering with JGroups Example</title>
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<h1>ActiveMQ Artemis Clustering with JGroups 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 the working of a two node cluster using JGroups as the underlying topology broadcasting/discovery
technique.</p>
<p>We deploy a queue on to the cluster, then create a consumer on the queue on each node, and we create a producer on only one of the nodes.</p>
<p>We then send some messages via the producer, and we verify that <b>both</b> consumers receive the sent messages
in a round-robin fashion.</p>
<p>This example uses JNDI to lookup the JMS Queue and ConnectionFactory objects. If you prefer not to use
JNDI, these could be instantiated directly.</p>
<p>To enable ActiveMQ Artemis to use JGroups you need to configure JGroups configuration file and make sure it is on the classpath
by placing in the configuration directory, the file test-jgroups-file_ping.xml is the configuration used in this
exaample</p>
<p>You then configure the jgroups file used by the broadcast and discovery groups in the configuration along with the
channel name which you want this cluster to share.</p>
<pre class="prettyprint">
<code>
<broadcast-groups>
<broadcast-group name="my-broadcast-group">
<broadcast-period>5000</broadcast-period>
<jgroups-file>test-jgroups-file_ping.xml</jgroups-file>
<jgroups-channel>activemq_broadcast_channel</jgroups-channel>
<connector-ref>netty-connector</connector-ref>
</broadcast-group>
</broadcast-groups>
<discovery-groups>
<discovery-group name="my-discovery-group">
<jgroups-file>test-jgroups-file_ping.xml</jgroups-file>
<jgroups-channel>activemq_broadcast_channel</jgroups-channel>
<refresh-timeout>10000</refresh-timeout>
</discovery-group>
</discovery-groups>
</code>
</pre>
<p>For more information on ActiveMQ Artemis clustering in general, please see the clustering
section of the user manual.</p>
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