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docItemCol_VOVn"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Apache StreamPipes<!-- --> <b>0.93.0</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, which is no longer actively maintained.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-sdk-functions/">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">SDK: Functions</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 0.93.0</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>SDK Guide: Functions</h1></header><h2 class="anchor anchorWithStickyNavbar_LWe7" id="introduction">Introduction<a href="#introduction" class="hash-link" aria-label="Direct link to Introduction" title="Direct link to Introduction"></a></h2><p>Pipeline elements such as data processors and data sinks are a great way |
| to create <em>reusable</em> components that can be part of pipelines. |
| However, creating a pipeline element is not always the best choice:</p><ul><li>The behaviour of a data processor is bound to a specific input stream <em>and</em></li><li>A data processor doesn't contain any user-defined configuration <em>and</em></li><li>The intended action is fixed or known at build time and the data processor shouldn't be available in the pipeline editor.</li></ul><p>To cover such use cases, we provide <em>StreamPipes Functions</em>. Functions |
| are a great way to define custom processing logic based on previously |
| connected data streams.</p><p>Functions can be registered in a similar way to pipeline elements, but define expected input |
| streams at startup time. Functions are started once the corresponding <em>extensions service</em> starts |
| and run until the service is stopped. </p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="writing-a-function">Writing a function<a href="#writing-a-function" class="hash-link" aria-label="Direct link to Writing a function" title="Direct link to Writing a function"></a></h2><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>Work in Progress</div><div class="admonitionContent_S0QG"><p>Functions are currently in preview mode and are not yet recommended for production usage. |
| APIs are subject to change in a future version.</p></div></div><p>To define a function, create a new extensions service using the <a href="/docs/0.93.0/extend-archetypes/">Maven Archetypes</a> or use an already existing service.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="skeleton">Skeleton<a href="#skeleton" class="hash-link" aria-label="Direct link to Skeleton" title="Direct link to Skeleton"></a></h3><p>Functions can be defined by creating a new class which extends the <code>StreamPipesFunction</code> class.</p><p>The basic skeleton looks like this:</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">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)">StreamPipesFunctionExample</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">extends</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">StreamPipesFunction</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><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)">FunctionId</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">getFunctionId</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)">FunctionId</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">from</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"my-function-id"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">1</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 class-name" style="color:rgb(255, 203, 107)">List</span><span class="token generics punctuation" style="color:rgb(199, 146, 234)"><</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 plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">requiredStreamIds</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)">List</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">of</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"<id of the required stream>"</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)">onServiceStarted</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token class-name" style="color:rgb(255, 203, 107)">FunctionContext</span><span class="token plain"> context</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">// called when the service is started</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 class-name" style="color:rgb(255, 203, 107)">String</span><span class="token plain"> streamId</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">// called when an event arrives</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)">onServiceStopped</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 comment" style="color:rgb(105, 112, 152);font-style:italic">// called when the service is stopped</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></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 structure of a function class is easy to understand:</p><ul><li><em>getFunctionId</em> requires an identifier in form of a <code>FunctionId</code>, which defines the id itself along with a version number that can be freely chosen.</li><li><em>requiredStreamIds</em> expects a list of references to data streams that are already available in StreamPipes. See below to learn how to find the id of a stream in StreamPipes.</li><li><em>onServiceStarted</em> is called once the extensions service is started and can be used to initialize the function.</li><li><em>onEvent</em> is called every time a new event arrives and provides a <code>streamId</code> as a reference to the corresponding stream, which is useful in case multiple data streams are received by the function.</li><li><em>onServiceStopped</em> is called when the extensions service is stopped and can be used to perform any required cleanup.</li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="getting-a-stream-id">Getting a stream ID<a href="#getting-a-stream-id" class="hash-link" aria-label="Direct link to Getting a stream ID" title="Direct link to Getting a stream ID"></a></h3><p>Functions require a reference to all data streams that should be retrieved by the function. |
| Currently, the only way to get the ID of a function is by navigating to the <code>Asset Management</code> view in the StreamPipes UI. |
| Create a new asset, click on <code>Edit Asset</code> and open <code>Add Link</code> in the <em>Linked Resources</em> panel. |
| Choose <code>Data Source</code> as link type, select one of the available sources, copy the <code>Resource ID</code> and provide this ID in the <code>requiredStreamIds</code> method.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="function-context">Function Context<a href="#function-context" class="hash-link" aria-label="Direct link to Function Context" title="Direct link to Function Context"></a></h3><p>The <code>onServiceStarted</code> method provides a function context which provides several convenience methods to work with functions:</p><ul><li><em>getFunctionId</em> returns the current function identifier</li><li><em>getConfig</em> returns a reference to configuration options of the extensions service</li><li><em>getClient</em> returns a reference to the StreamPipes client to interact with features from the REST API.</li><li><em>getStreams</em> returns the data model of all data streams defined in the <code>requiredStreamIds</code> method.</li><li><em>getSchema</em> returns the schema of a specific data stream by providing the <code>streamId</code></li></ul><h2 class="anchor anchorWithStickyNavbar_LWe7" id="registering-a-function">Registering a function<a href="#registering-a-function" class="hash-link" aria-label="Direct link to Registering a function" title="Direct link to Registering a function"></a></h2><p>Registering a function is easy and can be done in the <em>Init</em> class of the service. |
| E.g., considering a service definition as illustrated below, simply call <code>registerFunction</code> and |
| provide an instance of your function.</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 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)">SpServiceDefinition</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">provideServiceDefinition</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)">SpServiceDefinitionBuilder</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)">"my-service-id"</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)">"StreamPipes Function 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"> </span><span class="token string" style="color:rgb(195, 232, 141)">""</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 number" style="color:rgb(247, 140, 108)">8090</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)">registerFunction</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)">MyExampleFunction</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)">registerMessagingFormats</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">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">JsonDataFormatFactory</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)">registerMessagingProtocols</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">new</span><span class="token plain"> </span><span class="token class-name" style="color:rgb(255, 203, 107)">SpNatsProtocolFactory</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 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><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="metrics--monitoring">Metrics & Monitoring<a href="#metrics--monitoring" class="hash-link" aria-label="Direct link to Metrics & Monitoring" title="Direct link to Metrics & Monitoring"></a></h2><p>Similar to pipeline elements, function register at the StreamPipes core. |
| Running functions can be seen in the pipeline view of the user interface under <em>Functions</em>, right below the list of available pipelines. |
| Similar to pipelines, simple metrics, monitoring info and exceptions can be viewed in the <em>Details</em> section of each function.</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="2023-11-27T14:58:33.000Z">Nov 27, 2023</time></b> by <b>Tim</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/0.93.0/extend-client/"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">StreamPipes Client</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/0.93.0/extend-sdk-event-model/"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">SDK: Event Model</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="#introduction" class="table-of-contents__link toc-highlight">Introduction</a></li><li><a href="#writing-a-function" class="table-of-contents__link toc-highlight">Writing a function</a><ul><li><a href="#skeleton" class="table-of-contents__link toc-highlight">Skeleton</a></li><li><a href="#getting-a-stream-id" class="table-of-contents__link toc-highlight">Getting a stream ID</a></li><li><a href="#function-context" class="table-of-contents__link toc-highlight">Function Context</a></li></ul></li><li><a href="#registering-a-function" class="table-of-contents__link toc-highlight">Registering a function</a></li><li><a href="#metrics--monitoring" class="table-of-contents__link toc-highlight">Metrics & Monitoring</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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