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| Metrics |
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| Resource Limits |
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| The JMS Bridge |
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| Client Reconnection and Session Reattachment |
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| Diverting and Splitting Message Flows |
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| Core Bridges |
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| Transformers |
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| Duplicate Message Detection |
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| Clusters |
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| Federation |
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| Address Federation |
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| Queue Federation |
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| High Availability and Failover |
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| Graceful Server Shutdown |
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| Libaio Native Libraries |
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| Thread management |
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| Embedded Web Server |
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| Logging |
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| REST Interface |
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| Embedding the Broker |
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| Apache Karaf |
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| Apache Tomcat |
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| Spring Integration |
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| CDI Integration |
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| Intercepting Operations |
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| Data Tools |
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| <a href="." >Intercepting Operations</a> |
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| <section class="normal markdown-section"> |
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| <h1 id="intercepting-operations">Intercepting Operations</h1> |
| <p>Apache ActiveMQ Artemis supports <em>interceptors</em> to intercept packets entering |
| and exiting the server. Incoming and outgoing interceptors are be called for |
| any packet entering or exiting the server respectively. This allows custom code |
| to be executed, e.g. for auditing packets, filtering or other reasons. |
| Interceptors can change the packets they intercept. This makes interceptors |
| powerful, but also potentially dangerous.</p> |
| <h2 id="implementing-the-interceptors">Implementing The Interceptors</h2> |
| <p>All interceptors are protocol specific.</p> |
| <p>An interceptor for the core protocol must implement the interface |
| <code>Interceptor</code>:</p> |
| <pre><code class="lang-java"><span class="hljs-keyword">package</span> org.apache.activemq.artemis.api.core.interceptor; |
| |
| <span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">Interceptor</span> |
| </span>{ |
| <span class="hljs-function"><span class="hljs-keyword">boolean</span> <span class="hljs-title">intercept</span><span class="hljs-params">(Packet packet, RemotingConnection connection)</span> <span class="hljs-keyword">throws</span> ActiveMQException</span>; |
| } |
| </code></pre> |
| <p>For stomp protocol an interceptor must implement the interface <code>StompFrameInterceptor</code>:</p> |
| <pre><code class="lang-java"><span class="hljs-keyword">package</span> org.apache.activemq.artemis.core.protocol.stomp; |
| |
| <span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">StompFrameInterceptor</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">BaseInterceptor</span><<span class="hljs-title">StompFrame</span>> |
| </span>{ |
| <span class="hljs-function"><span class="hljs-keyword">boolean</span> <span class="hljs-title">intercept</span><span class="hljs-params">(StompFrame stompFrame, RemotingConnection connection)</span></span>; |
| } |
| </code></pre> |
| <p>Likewise for MQTT protocol, an interceptor must implement the interface |
| <code>MQTTInterceptor</code>:</p> |
| <pre><code class="lang-java"><span class="hljs-keyword">package</span> org.apache.activemq.artemis.core.protocol.mqtt; |
| |
| <span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">interface</span> <span class="hljs-title">MQTTInterceptor</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">BaseInterceptor</span><<span class="hljs-title">MqttMessage</span>> |
| </span>{ |
| <span class="hljs-function"><span class="hljs-keyword">boolean</span> <span class="hljs-title">intercept</span><span class="hljs-params">(MqttMessage mqttMessage, RemotingConnection connection)</span></span>; |
| } |
| </code></pre> |
| <p>The returned boolean value is important:</p> |
| <ul> |
| <li><p>if <code>true</code> is returned, the process continues normally</p> |
| </li> |
| <li><p>if <code>false</code> is returned, the process is aborted, no other interceptors will be |
| called and the packet will not be processed further by the server.</p> |
| </li> |
| </ul> |
| <h2 id="configuring-the-interceptors">Configuring The Interceptors</h2> |
| <p>Both incoming and outgoing interceptors are configured in <code>broker.xml</code>:</p> |
| <pre><code class="lang-xml"><span class="hljs-tag"><<span class="hljs-name">remoting-incoming-interceptors</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">class-name</span>></span>org.apache.activemq.artemis.jms.example.LoginInterceptor<span class="hljs-tag"></<span class="hljs-name">class-name</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">class-name</span>></span>org.apache.activemq.artemis.jms.example.AdditionalPropertyInterceptor<span class="hljs-tag"></<span class="hljs-name">class-name</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">remoting-incoming-interceptors</span>></span> |
| |
| <span class="hljs-tag"><<span class="hljs-name">remoting-outgoing-interceptors</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">class-name</span>></span>org.apache.activemq.artemis.jms.example.LogoutInterceptor<span class="hljs-tag"></<span class="hljs-name">class-name</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">class-name</span>></span>org.apache.activemq.artemis.jms.example.AdditionalPropertyInterceptor<span class="hljs-tag"></<span class="hljs-name">class-name</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">remoting-outgoing-interceptors</span>></span> |
| </code></pre> |
| <p>See the documentation on <a href="using-server.html">adding runtime dependencies</a> to |
| understand how to make your interceptor available to the broker.</p> |
| <h2 id="interceptors-on-the-client-side">Interceptors on the Client Side</h2> |
| <p>The interceptors can also be run on the Apache ActiveMQ Artemit client side to |
| intercept packets either sent by the client to the server or by the server to |
| the client. This is done by adding the interceptor to the <code>ServerLocator</code> with |
| the <code>addIncomingInterceptor(Interceptor)</code> or |
| <code>addOutgoingInterceptor(Interceptor)</code> methods.</p> |
| <p>As noted above, if an interceptor returns <code>false</code> then the sending of the |
| packet is aborted which means that no other interceptors are be called and the |
| packet is not be processed further by the client. Typically this process |
| happens transparently to the client (i.e. it has no idea if a packet was |
| aborted or not). However, in the case of an outgoing packet that is sent in a |
| <code>blocking</code> fashion a <code>ActiveMQException</code> will be thrown to the caller. The |
| exception is thrown because blocking sends provide reliability and it is |
| considered an error for them not to succeed. <code>Blocking</code> sends occurs when, for |
| example, an application invokes <code>setBlockOnNonDurableSend(true)</code> or |
| <code>setBlockOnDurableSend(true)</code> on its <code>ServerLocator</code> or if an application is |
| using a JMS connection factory retrieved from JNDI that has either |
| <code>block-on-durable-send</code> or <code>block-on-non-durable-send</code> set to <code>true</code>. Blocking |
| is also used for packets dealing with transactions (e.g. commit, roll-back, |
| etc.). The <code>ActiveMQException</code> thrown will contain the name of the interceptor |
| that returned false.</p> |
| <p>As on the server, the client interceptor classes (and their dependencies) must |
| be added to the classpath to be properly instantiated and invoked.</p> |
| <h2 id="examples">Examples</h2> |
| <p>See the following examples which show how to use interceptors:</p> |
| <ul> |
| <li><a href="examples.html#interceptor">Interceptor</a></li> |
| <li><a href="examples.html#interceptor-amqp">Interceptor AMQP</a></li> |
| <li><a href="examples.html#interceptor-client">Interceptor Client</a></li> |
| <li><a href="examples.html#interceptor-mqtt">Interceptor MQTT</a></li> |
| </ul> |
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