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<title data-rh="true">Tutorial: Data Sinks | Apache StreamPipes</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:image" content="https://streampipes.apache.org/img/favicon.png"><meta data-rh="true" name="twitter:image" content="https://streampipes.apache.org/img/favicon.png"><meta data-rh="true" property="og:url" content="https://streampipes.apache.org/docs/0.95.1/extend-tutorial-data-sinks/"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="0.95.1"><meta data-rh="true" name="docusaurus_tag" content="docs-default-0.95.1"><meta data-rh="true" name="docsearch:version" content="0.95.1"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-0.95.1"><meta data-rh="true" property="og:title" content="Tutorial: Data Sinks | Apache StreamPipes"><meta data-rh="true" name="description" content="In this tutorial, we will add a new data sink using the standalone wrapper."><meta data-rh="true" property="og:description" content="In this tutorial, we will add a new data sink using the standalone wrapper."><link data-rh="true" rel="icon" href="/img/favicon.png"><link data-rh="true" rel="canonical" href="https://streampipes.apache.org/docs/0.95.1/extend-tutorial-data-sinks/"><link data-rh="true" rel="alternate" href="https://streampipes.apache.org/docs/0.95.1/extend-tutorial-data-sinks/" hreflang="en"><link data-rh="true" rel="alternate" href="https://streampipes.apache.org/docs/0.95.1/extend-tutorial-data-sinks/" hreflang="x-default"><link rel="alternate" type="application/rss+xml" href="/blog/rss.xml" title="Apache StreamPipes RSS Feed">
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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Apache StreamPipes<!-- --> <b>0.95.1</b>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/docs/extend-tutorial-data-sinks/">latest version</a></b> (<!-- -->0.97.0<!-- -->).</div></div><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 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">💻 Customize StreamPipes</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">Tutorial: Data Sinks</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 0.95.1</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>Tutorial: Data Sinks</h1></header><p>In this tutorial, we will add a new data sink using the standalone wrapper.</p><p>From an architectural point of view, we will create a self-contained service that includes the description of the data
sink and a corresponding implementation.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="objective">Objective<a href="#objective" class="hash-link" aria-label="Direct link to Objective" title="Direct link to Objective">​</a></h2><p>We are going to create a new data sink that calls an external HTTP endpoint to forward data to an external service.</p><p>For each incoming event, an external service is invoked using an HTTP POST request. In this example, we&#x27;ll call an
endpoint provided by <a href="https://requestbin.com/" target="_blank" rel="noopener noreferrer">RequestBin</a>.
To setup your own endpoint, go to <a href="https://requestbin.com/" target="_blank" rel="noopener noreferrer">https://requestbin.com/</a> and click &quot;Create a request bin&quot;.
Copy the URL of the newly created endpoint.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="project-setup">Project setup<a href="#project-setup" class="hash-link" aria-label="Direct link to Project setup" title="Direct link to Project setup">​</a></h2><p>Instead of creating a new project from scratch, we recommend to use the Maven archetype to create a new project
skeleton (streampipes-archetype-extensions-jvm).
Enter the following command in a command line of your choice (Apache Maven needs to be installed):</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">mvn archetype:generate -DarchetypeGroupId=org.apache.streampipes \</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">-DarchetypeArtifactId=streampipes-archetype-extensions-jvm -DarchetypeVersion=0.93.0 \</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain">-DgroupId=org.streampipes.tutorial -DartifactId=sink-tutorial -DclassNamePrefix=Rest -DpackageName=mypackage</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><p>You will see a project structure similar to the structure shown in the <a href="/docs/0.95.1/extend-archetypes/">archetypes</a> section.</p><div class="theme-admonition theme-admonition-tip alert alert--success admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_S0QG"><p>Besides the basic project skeleton, the sample project also includes an example Dockerfile you can use to package your
application into a Docker container.</p></div></div><p>Now you&#x27;re ready to create your first data sink for StreamPipes!</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="adding-data-sink-requirements">Adding data sink requirements<a href="#adding-data-sink-requirements" class="hash-link" aria-label="Direct link to Adding data sink requirements" title="Direct link to Adding data sink requirements">​</a></h2><p>First, we will add a new stream requirement.
Create a class <code>RestSink</code> which should look as follows:</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 keyword" style="font-style:italic">package</span><span class="token plain"> </span><span class="token namespace" style="color:rgb(178, 204, 214)">org</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">pe</span><span class="token namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token namespace" style="color:rgb(178, 204, 214)">example</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">extensions</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">api</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">pe</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">IStreamPipesDataSink</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">extensions</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">api</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">pe</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">config</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">IDataSinkConfiguration</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">extensions</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">api</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">pe</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">context</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">EventSinkRuntimeContext</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">extensions</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">api</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">pe</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">param</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">IDataSinkParameters</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">model</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">DataSinkType</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">model</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">runtime</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">Event</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">model</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">schema</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">PropertyScope</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">sdk</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">builder</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">DataSinkBuilder</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">sdk</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">builder</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">StreamRequirementsBuilder</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">sdk</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">builder</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">sink</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">DataSinkConfiguration</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">sdk</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">helpers</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">EpRequirements</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">sdk</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">helpers</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">Labels</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">sdk</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">helpers</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">Locales</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 keyword" style="font-style:italic">import</span><span class="token plain"> </span><span class="token import namespace" style="color:rgb(178, 204, 214)">org</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">apache</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">streampipes</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">sdk</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import namespace" style="color:rgb(178, 204, 214)">utils</span><span class="token import namespace punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token import class-name" style="color:rgb(255, 203, 107)">Assets</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 keyword" style="font-style:italic">public</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">class</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">RestSink</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">implements</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">IStreamPipesDataSink</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" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><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 class-name" style="color:rgb(255, 203, 107)">IDataSinkConfiguration</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">declareConfig</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><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 keyword" style="font-style:italic">return</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">DataSinkConfiguration</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">create</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 class-name" style="color:rgb(255, 203, 107)">RestSink</span><span class="token operator" style="color:rgb(137, 221, 255)">::</span><span class="token keyword" style="font-style:italic">new</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 class-name" style="color:rgb(255, 203, 107)">DataSinkBuilder</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">create</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">&quot;org.apache.streampipes.tutorial.pe.sink.rest&quot;</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, 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</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 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 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 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 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)">onPipelineStopped</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><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 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" style="display:inline-block"></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><p>In this class, we need to implement three methods: The <code>declareConfig</code> method is used to define abstract stream
requirements such as event properties that must be present in any input stream that is later connected to the element
using the StreamPipes UI.
The second method, <code>onPipelineStarted</code> is called once a pipeline using this sink is started. The third method, <code>onEvent</code>, is
called for every incoming event.</p><p>The <code>DataSinkBuilder</code> within the <code>declareConfig</code> method describes the properties of our data sink:</p><ul><li><code>category</code> defines a category for this sink.</li><li><code>withAssets</code> denotes that we will provide an external documentation file and an icon, which can be found in
the <code>resources</code> folder</li><li><code>withLocales</code> defines that we will provide an external language file, also available in the <code>resources</code> folder</li><li><code>requiredStream</code> defines requirements any input stream connected to this sink must provide. In this case, we do not
have any specific requirements, we just forward all incoming events to the REST sink. However, we want to let the user
display a list of available fields from the connected input event, where users can select a subset. This is defined by
defining a Mapping from the empty requirement. This will later on render a selection dialog in the pipeline editor.</li></ul><p>The <code>onPipelineStarted</code> method is called when a pipeline containing the sink is started. Once a pipeline is started, we
would like to extract user-defined parameters.
In this example, we simply extract the fields selected by users that should be forwarded to the REST sink. Finally, we
return a new configured event sink containing the parameters.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="pipeline-element-invocation">Pipeline element invocation<a href="#pipeline-element-invocation" class="hash-link" aria-label="Direct link to Pipeline element invocation" title="Direct link to Pipeline element invocation">​</a></h2><p>Once users start a pipeline that uses our geofencing component, the <em>onInvocation</em> method in our class is called. The
interface <code>IDataSinkParameters</code> includes methods to extract the configuration parameters a user has selected in
the pipeline editor and information on the actual streams that are connected to the pipeline element.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="adding-an-implementation">Adding an implementation<a href="#adding-an-implementation" class="hash-link" aria-label="Direct link to Adding an implementation" title="Direct link to Adding an implementation">​</a></h2><p>Now we&#x27;ll add a proper implementation (i.e., the Rest call executed for every incoming event) to the following methods:</p><p>Our final class should look as follows:</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 keyword" style="font-style:italic">package</span><span class="token plain"> </span><span class="token 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style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">private</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">SpDataFormatDefinition</span><span class="token plain"> dataFormatDefinition</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 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 class-name" style="color:rgb(255, 203, 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class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">RestSink</span><span class="token operator" style="color:rgb(137, 221, 255)">::</span><span class="token keyword" style="font-style:italic">new</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 class-name" style="color:rgb(255, 203, 107)">DataSinkBuilder</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">create</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">&quot;org.apache.streampipes.tutorial.pe.sink.rest&quot;</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><span class="token function" style="color:rgb(130, 170, 255)">category</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">DataSinkType</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">NOTIFICATION</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><span class="token function" style="color:rgb(130, 170, 255)">withAssets</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">Assets</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">DOCUMENTATION</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)">Assets</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">ICON</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><span class="token function" style="color:rgb(130, 170, 255)">withLocales</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">Locales</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">EN</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><span class="token function" style="color:rgb(130, 170, 255)">requiredStream</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">StreamRequirementsBuilder</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><span class="token function" style="color:rgb(130, 170, 255)">create</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><span class="token function" style="color:rgb(130, 170, 255)">requiredPropertyWithNaryMapping</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">EpRequirements</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">anyProperty</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 punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">Labels</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">withId</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 string" style="color:rgb(195, 232, 141)">&quot;fields-to-send&quot;</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><span class="token class-name" style="color:rgb(255, 203, 107)">PropertyScope</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token constant" style="color:rgb(130, 170, 255)">NONE</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><span class="token function" style="color:rgb(130, 170, 255)">build</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 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><span class="token function" style="color:rgb(130, 170, 255)">build</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><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><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 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)">onPipelineStarted</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">IDataSinkParameters</span><span class="token plain"> params</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 class-name" style="color:rgb(255, 203, 107)">EventSinkRuntimeContext</span><span class="token plain"> eventSinkRuntimeContext</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 keyword" style="font-style:italic">this</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">dataFormatDefinition </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">JsonDataFormatDefinition</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 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 keyword" style="font-style:italic">this</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">fieldsToSend </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> params</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">extractor</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 punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">mappingPropertyValues</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">&quot;fields-to-send&quot;</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><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 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 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 class-name" style="color:rgb(255, 203, 107)">Map</span><span class="token generics punctuation" style="color:rgb(199, 146, 234)">&lt;</span><span class="token generics class-name" style="color:rgb(255, 203, 107)">String</span><span class="token generics punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token generics"> </span><span class="token generics class-name" style="color:rgb(255, 203, 107)">Object</span><span class="token generics punctuation" style="color:rgb(199, 146, 234)">&gt;</span><span class="token plain"> outEventMap </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> event</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">getSubset</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">fieldsToSend</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 function" style="color:rgb(130, 170, 255)">getRaw</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 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 keyword" style="font-style:italic">try</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 class-name" style="color:rgb(255, 203, 107)">String</span><span class="token plain"> json </span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">String</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">dataFormatDefinition</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">fromMap</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">outEventMap</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 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 class-name" style="color:rgb(255, 203, 107)">Request</span><span class="token class-name punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token class-name" style="color:rgb(255, 203, 107)">Post</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token constant" style="color:rgb(130, 170, 255)">REST_ENDPOINT_URI</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 function" style="color:rgb(130, 170, 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255)">execute</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 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><span class="token plain"> </span><span class="token keyword" style="font-style:italic">catch</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">SpRuntimeException</span><span class="token plain"> e</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 constant" style="color:rgb(130, 170, 255)">LOG</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">error</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">&quot;Could not parse incoming event&quot;</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><span class="token plain"> </span><span class="token keyword" style="font-style:italic">catch</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">IOException</span><span class="token plain"> e</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 constant" style="color:rgb(130, 170, 255)">LOG</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">error</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">&quot;Could not reach endpoint at {}&quot;</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token constant" style="color:rgb(130, 170, 255)">REST_ENDPOINT_URI</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><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><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 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)">onPipelineStopped</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><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 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><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></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><p>The only class variable you need to change right now is the REST_ENDPOINT_URL. Change this url to the URL provided by
your request bin.
In the <code>ònEvent</code> method, we use a helper method to get a subset of the incoming event.
Finally, we convert the resulting <code>Map</code> to a JSON string and call the endpoint.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="preparing-the-service">Preparing the service<a href="#preparing-the-service" class="hash-link" aria-label="Direct link to Preparing the service" title="Direct link to Preparing the service">​</a></h2><p>The final step is to register the sink as a pipeline element.</p><p>Go to the class <code>Init</code> and register the sink:</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 punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">registerPipelineElement</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token keyword" style="font-style:italic">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">RestSink</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 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="starting-the-service">Starting the service<a href="#starting-the-service" class="hash-link" aria-label="Direct link to Starting the service" title="Direct link to Starting the service">​</a></h2><div class="theme-admonition theme-admonition-tip alert alert--success admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_S0QG"><p>Once you start the service, it will register in StreamPipes with the hostname. The hostname will be auto-discovered and
should work out-of-the-box.
In some cases, the detected hostname is not resolvable from within a container (where the core is running). In this
case, provide a SP_HOST environment variable to override the auto-discovery.</p></div></div><div class="theme-admonition theme-admonition-tip alert alert--success admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewBox="0 0 12 16"><path fill-rule="evenodd" d="M6.5 0C3.48 0 1 2.19 1 5c0 .92.55 2.25 1 3 1.34 2.25 1.78 2.78 2 4v1h5v-1c.22-1.22.66-1.75 2-4 .45-.75 1-2.08 1-3 0-2.81-2.48-5-5.5-5zm3.64 7.48c-.25.44-.47.8-.67 1.11-.86 1.41-1.25 2.06-1.45 3.23-.02.05-.02.11-.02.17H5c0-.06 0-.13-.02-.17-.2-1.17-.59-1.83-1.45-3.23-.2-.31-.42-.67-.67-1.11C2.44 6.78 2 5.65 2 5c0-2.2 2.02-4 4.5-4 1.22 0 2.36.42 3.22 1.19C10.55 2.94 11 3.94 11 5c0 .66-.44 1.78-.86 2.48zM4 14h5c-.23 1.14-1.3 2-2.5 2s-2.27-.86-2.5-2z"></path></svg></span>tip</div><div class="admonitionContent_S0QG"><p>The default port of all pipeline element services as defined in the <code>create</code> method is port 8090.
If you&#x27;d like to run multiple services at the same time on your development machine, change the port here. As an
alternative, you can also provide an env variable <code>SP_PORT</code> which overrides the port settings. This is useful to use
different configs for dev and prod environments.</p></div></div><p>Now we are ready to start our service!</p><p>Configure your IDE to provide an environment variable called <code>SP_DEBUG</code> with value <code>true</code> when starting the project.</p><p>Execute the main method in the class <code>Init</code> we&#x27;ve just created. The service automatically registers itself in
StreamPipes.</p><p>To install the created element, open the StreamPipes UI and follow the manual provided in
the <a href="/docs/0.95.1/use-install-pipeline-elements/">user guide</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="read-more">Read more<a href="#read-more" class="hash-link" aria-label="Direct link to Read more" title="Direct link to Read more">​</a></h2><p>Congratulations! You&#x27;ve just created your first data sink for StreamPipes.
There are many more things to explore and data sinks can be defined in much more detail using multiple wrappers.
Follow our <a href="/docs/0.95.1/dev-guide-sdk-guide-sinks/">SDK guide</a> to see what&#x27;s possible!</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="2024-07-11T06:13:30.000Z">Jul 11, 2024</time></b> by <b>Dominik Riemer</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/0.95.1/extend-tutorial-data-processors/"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Tutorial: Data Processors</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/0.95.1/extend-client/"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">StreamPipes Client</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="#objective" class="table-of-contents__link toc-highlight">Objective</a></li><li><a href="#project-setup" class="table-of-contents__link toc-highlight">Project setup</a></li><li><a href="#adding-data-sink-requirements" class="table-of-contents__link toc-highlight">Adding data sink requirements</a></li><li><a href="#pipeline-element-invocation" class="table-of-contents__link toc-highlight">Pipeline element invocation</a></li><li><a href="#adding-an-implementation" class="table-of-contents__link toc-highlight">Adding an implementation</a></li><li><a href="#preparing-the-service" class="table-of-contents__link toc-highlight">Preparing the service</a></li><li><a href="#starting-the-service" class="table-of-contents__link toc-highlight">Starting the service</a></li><li><a href="#read-more" class="table-of-contents__link toc-highlight">Read more</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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