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19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Design and Concept</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">DataProxy Plugin</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 1.11.0</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>DataProxy Plugin</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="overview">Overview<a href="#overview" class="hash-link" aria-label="Direct link to Overview" title="Direct link to Overview"></a></h2><p>DataProxy implements an abstract unified MQ (Message Queue) sink model, so that developers and easily extend mq sink types under standard MessageQueueZoneSink. By default, Apache Pulsar, Apache Kafka and InLong TubeMQ are already integrated. This article guides developers to extend new MQ types accordingly.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="concepts-and-models">Concepts and Models<a href="#concepts-and-models" class="hash-link" aria-label="Direct link to Concepts and Models" title="Direct link to Concepts and Models"></a></h2><p>DataProxy is a message flow architecture based on Apache Flume with its <code>Source</code> + <code>Channel</code> + <code>Sink</code> components. Here we focus on the sink layer alone.</p><ul><li><code>MessageQueueZoneSink</code>: The standard MQ sink provided by DataProxy, supposedly to support all kinds of MQ types.</li><li><code>MessageQueueHandler</code>: The abstract MQ handler interface that deals with connecting, sending data to, and disconnecting the MQ cluster.</li><li><code>EventHandler</code>: The interface to convert MQ message header and body when required. For example to convert the data protocol. </li></ul><p>When a new MQ cluster type needs to be integrated, developers should at least implement the MessageQueueHandler interface as plugin. Optionally they can also implement the EventHandler interface to transform data as required. The plugin classes can be specified and pulled from manager as configuration information so that new MQ type can be easily extended on the fly.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="demonstration">Demonstration<a href="#demonstration" class="hash-link" aria-label="Direct link to Demonstration" title="Direct link to Demonstration"></a></h2><p>The concepts introduced above can be represented by the following figure: |
| <img loading="lazy" src="/assets/images/dataproxy_mq_sink-19727a38bb02c1b70852b63593013a8b.png" width="959" height="511" class="img_ev3q"></p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="development-process">Development Process<a href="#development-process" class="hash-link" aria-label="Direct link to Development Process" title="Direct link to Development Process"></a></h2><p>In the rest of the article we use the Kafka MQ with ProtoBuffer message format as an example. Here's what to do:</p><ul><li>Implement the subclass plugin of MessageQueueHandler, namely KafKaHandler and its init / start /stop / send methods.</li><li>Implenent the EventHandler interface as ProtoBufferEventHandler and its parseHeader / parseBody method </li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="plugin-implementation">Plugin Implementation<a href="#plugin-implementation" class="hash-link" aria-label="Direct link to Plugin Implementation" title="Direct link to Plugin Implementation"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="messagequeuehandler">MessageQueueHandler<a href="#messagequeuehandler" class="hash-link" aria-label="Direct link to MessageQueueHandler" title="Direct link to MessageQueueHandler"></a></h3><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">private class KafkaHandler implements MessageQueueHandler {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> private EventHandler handler;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @Override</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> public void init(CacheClusterConfig config, MessageQueueZoneSinkContext sinkContext) {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // initialize configuration and event handler</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @Override</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> public void start() {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // create Kafka Producer</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @Override</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> public void stop() {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // close Kafka Producer</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @Override</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> public boolean send(BatchPackProfile event) {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // process and send data</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="eventhandler">EventHandler<a href="#eventhandler" class="hash-link" aria-label="Direct link to EventHandler" title="Direct link to EventHandler"></a></h3><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-java codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">public class ProtoBufferEventHandler implements EventHandler {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @Override</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> public Map<String, String> parseHeader(IdTopicConfig idConfig, BatchPackProfile profile, String nodeId,</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> INLONG_COMPRESSED_TYPE compressType) {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // retrieve, process and convert event header</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @Override</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> public byte[] parseBody(IdTopicConfig idConfig, BatchPackProfile profile, INLONG_COMPRESSED_TYPE compressType)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> throws IOException {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // retrieve and repack event to ProtoBuffer message</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>(See the full implementation org.apache.inlong.dataproxy.sink.mq.kafka.KafkaHandler from inlong-dataproxy module)</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="plugin-configuration">Plugin Configuration<a href="#plugin-configuration" class="hash-link" aria-label="Direct link to Plugin Configuration" title="Direct link to Plugin Configuration"></a></h2><h3 class="anchor anchorWithStickyNavbar_LWe7" id="dataproxyconf">dataproxy.conf<a href="#dataproxyconf" class="hash-link" aria-label="Direct link to dataproxy.conf" title="Direct link to dataproxy.conf"></a></h3><p>The sink configuration please refer to <a href="/docs/modules/dataproxy/configuration">Sink Configuration Exampnle</a></p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div 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