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this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Your first data processor</h1></header><p>In this section, we will explain how to start a pipeline element service and install it using the StreamPipes UI.</p><p>Open the class <em>ExampleDataProcessor</em> and edit the <code>onEvent</code> method to print the incoming event, log it to the console and send it to the next component without changing it.</p><div class="language-java codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><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:#bfc7d5"><span class="token annotation punctuation" style="color:rgb(199, 146, 234)">@Override</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">void</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">onEvent</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">Event</span><span class="token plain"> event</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">SpOutputCollector</span><span class="token plain"> collector</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// Print the incoming event on the console</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">System</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">out</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">println</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">event</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// Hand the incoming event to the output collector without changing it.</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> collector</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">collect</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">event</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">;</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</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 viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" 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 viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="start-processor">Start Processor<a href="#start-processor" class="hash-link" aria-label="Direct link to Start Processor" title="Direct link to Start Processor"></a></h2><p>Starting from StreamPipes 0.69.0, the IP address of an extensions service (processor, adapter or sink) will be auto-discovered upon start. |
| The auto-discovery is done by the StreamPipes service discovery mechanism and should work for most setups. |
| Once you start an extensions service, you will see the chosen IP in printed in the console. Make sure that this IP does not point to localhost (127.0.0.1). |
| If you see such an IP or the extensions service complains that it cannot resolve the IP, you can manually set the IP address of the extensions service. You can do so by providing an <code>SP_HOST</code> environment variable.</p><img loading="lazy" src="/img/archetype/endpoint.png" width="90%" alt="Project Structure" class="img_ev3q"><p>To check if the service is up and running, open the browser on <em>'localhost:8090'</em> (or the port defined in the service definition). The machine-readable description of the processor should be visible as shown below.</p><div class="theme-admonition theme-admonition-caution alert alert--warning admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 16 16"><path fill-rule="evenodd" d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z"></path></svg></span>Common Problems</div><div class="admonitionContent_S0QG"><p>If the service description is not shown on 'localhost:8090', you might have to change the port address. |
| This needs to be done in the configuration of your service, further explained in the configurations part of the developer guide.</p><p>If the service does not show up in the StreamPipes installation menu, click on 'MANAGE ENDPOINTS' and add 'http://<span></span>YOUR_IP_OR_DNS_NAME:8090'. |
| Use the IP or DNS name you provided as the SP_HOST variable or the IP (if resolvable) found by the auto-discovery service printed in the console. |
| After adding the endpoint, a new processor with the name <em>Example</em> should show up.</p></div></div><p>Now you can go to StreamPipes. |
| Your new processor <em>'Example'</em> should now show up in the installation menu ("Install Pipeline Elements" in the left navigation bar). |
| Install it, then switch to the pipeline view and create a simple pipeline that makes use of your newly created processor. |
| In case you opened the StreamPipes installation for the first time, it should have been automatically installed during the setup process.</p><img loading="lazy" src="/img/archetype/example_pipeline.png" width="80%" alt="Project Structure" class="img_ev3q"><p>Start this pipeline. |
| Now you should see logging messages in your console and, once you've created a visualization, you can also see the resulting events of your component in StreamPipes.</p><p>Congratulations, you have just created your first processor! |
| From here on you can start experimenting and implement your own algorithms.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"></div><div class="col lastUpdated_vwxv"><span class="theme-last-updated">Last updated<!-- --> on <b><time datetime="2025-02-17T13:33:25.000Z">Feb 17, 2025</time></b> by <b>Philipp Zehnder</b></span></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/extend-archetypes/"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Maven Archetypes</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/extend-tutorial-adapters/"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">Tutorial: Adapters</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#start-processor" class="table-of-contents__link toc-highlight">Start Processor</a></li></ul></div></div></div></div></main></div></div><footer class="container_yWIM"><div class="linksRow_XFIr"><div class="linksCol_rFJL"><div>ASF</div><ul><li class="footer__item"><a href="https://www.apache.org/" target="_blank" rel="noopener noreferrer"><span></span><span>Foundation</span></a></li><li class="footer__item"><a href="https://www.apache.org/licenses/" target="_blank" rel="noopener noreferrer"><span></span><span>License</span></a></li><li class="footer__item"><a href="https://www.apache.org/events/" target="_blank" rel="noopener noreferrer"><span></span><span>Events</span></a></li><li class="footer__item"><a href="https://www.apache.org/security/" target="_blank" rel="noopener noreferrer"><span></span><span>Security</span></a></li><li class="footer__item"><a href="https://www.apache.org/foundation/sponsorship.html" target="_blank" rel="noopener noreferrer"><span></span><span>Sponsorship</span></a></li><li class="footer__item"><a href="https://www.apache.org/foundation/thanks.html" target="_blank" rel="noopener noreferrer"><span></span><span>Thanks</span></a></li></ul></div><div class="linksCol_rFJL"><div>Community</div><ul><li class="footer__item"><a href="https://github.com/apache/streampipes/issues" target="_blank" rel="noopener noreferrer"><span></span><span>GitHub Issues</span></a></li><li class="footer__item"><a href="https://github.com/apache/streampipes/discussions" target="_blank" rel="noopener noreferrer"><span></span><span>Github Discussions</span></a></li><li class="footer__item"><a href="https://twitter.com/StreamPipes" target="_blank" rel="noopener noreferrer"><span></span><span>Twitter</span></a></li><li class="footer__item"><a href="https://www.linkedin.com/company/apache-streampipes" target="_blank" rel="noopener noreferrer"><span></span><span>LinkedIn</span></a></li></ul></div><div class="linksCol_rFJL"><div>More</div><ul><li class="footer__item"><a target="_parent" href="/blog/"><span></span><span>Blog</span></a></li><li class="footer__item"><a href="https://privacy.apache.org/policies/privacy-policy-public.html" target="_parent" rel="noopener noreferrer"><span></span><span>Privacy</span></a></li></ul></div></div><div class="copyright_AoBa"><a href="https://www.apache.org/" target="_blank" rel="noopener noreferrer"><span style="display:inline-block;width:231.25px;height:40px"></span></a><div>Copyright © 2019-2025 The Apache Software Foundation. Apache StreamPipes, Apache, the Apache feather logo, and the Apache StreamPipes project logo are either registered trademarks or trademarks of the Apache Software Foundation.</div></div></footer></div> |
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