<!--
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<html>
<head>
<title>ActiveMQ Artemis JMS Interceptor 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>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>
</body>
</html>
d17ef14c90