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<title>ActiveMQ Artemis JMS Interceptor Example</title>
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<h1>MQTT Interceptor 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 shows you how to implement and configure a simple incoming, server-side MQTT interceptor with ActiveMQ Artemis.</p>
<p>ActiveMQ Artemis allows an application to use an interceptor to hook into the messaging system. All that needs to do is to implement the
Interceptor interface, as defined below: </p>
<pre class="prettyprint">
<code>
public interface Interceptor
{
boolean intercept(final MqttMessage mqttMessage, RemotingConnection connection);
}
</code>
</pre>
<p>Once you have your own interceptor class, add it to the broker.xml, as follows:</p>
<pre class="prettyprint">
<code>
<configuration>
...
<remoting-incoming-interceptors>
<class-name>org.apache.activemq.artemis.mqtt.example.SimpleMQTTInterceptor</class-name>
</remoting-incoming-interceptors>
...
</configuration>
</code>
</pre>
<p>With interceptor, you can handle various events in message processing. In this example, a simple interceptor, SimpleMQTTInterceptor, is implemented and configured.
When the example is running, the interceptor will modify the payload of a sample MQTT message.</p>
<p>With our interceptor we always return <code>true</code> from the <code>intercept</code> method. If we were
to return <code>false</code> that signifies that no more interceptors are to run.
Throw an exception to abort processing of the packet.</p>
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