<!DOCTYPE html><html><head><title>Engine Server Plugin</title><meta charset="utf-8"/><meta content="IE=edge,chrome=1" http-equiv="X-UA-Compatible"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta class="swiftype" name="title" data-type="string" content="Engine Server Plugin"/><link rel="canonical" href="https://predictionio.apache.org/deploy/plugin/"/><link href="/images/favicon/normal-b330020a.png" rel="shortcut icon"/><link href="/images/favicon/apple-c0febcf2.png" rel="apple-touch-icon"/><link href="//fonts.googleapis.com/css?family=Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800" rel="stylesheet"/><link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet"/><link href="/stylesheets/application-eccfc6cb.css" rel="stylesheet" type="text/css"/><script src="//cdnjs.cloudflare.com/ajax/libs/html5shiv/3.7.2/html5shiv.min.js"></script><script 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class="expandible" href="#"><span>Collecting and Analyzing Data</span></a><ul><li class="level-2"><a class="final" href="/datacollection/"><span>Event Server Overview</span></a></li><li class="level-2"><a class="final" href="/datacollection/eventapi/"><span>Collecting Data with REST/SDKs</span></a></li><li class="level-2"><a class="final" href="/datacollection/eventmodel/"><span>Events Modeling</span></a></li><li class="level-2"><a class="final" href="/datacollection/webhooks/"><span>Unifying Multichannel Data with Webhooks</span></a></li><li class="level-2"><a class="final" href="/datacollection/channel/"><span>Channel</span></a></li><li class="level-2"><a class="final" href="/datacollection/batchimport/"><span>Importing Data in Batch</span></a></li><li class="level-2"><a class="final" href="/datacollection/analytics/"><span>Using Analytics Tools</span></a></li><li class="level-2"><a class="final" href="/datacollection/plugin/"><span>Event Server Plugin</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Choosing an Algorithm</span></a><ul><li class="level-2"><a class="final" href="/algorithm/"><span>Built-in Algorithm Libraries</span></a></li><li class="level-2"><a class="final" href="/algorithm/switch/"><span>Switching to Another Algorithm</span></a></li><li class="level-2"><a class="final" href="/algorithm/multiple/"><span>Combining Multiple Algorithms</span></a></li><li class="level-2"><a class="final" href="/algorithm/custom/"><span>Adding Your Own Algorithms</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Tuning and Evaluation</span></a><ul><li class="level-2"><a class="final" href="/evaluation/"><span>Overview</span></a></li><li class="level-2"><a class="final" href="/evaluation/paramtuning/"><span>Hyperparameter Tuning</span></a></li><li class="level-2"><a class="final" href="/evaluation/evaluationdashboard/"><span>Evaluation Dashboard</span></a></li><li class="level-2"><a class="final" 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href="/templates/recommendation/dase/"><span>DASE</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/evaluation/"><span>Evaluation Explained</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/how-to/"><span>How-To</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/reading-custom-events/"><span>Read Custom Events</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/customize-data-prep/"><span>Customize Data Preparator</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/customize-serving/"><span>Customize Serving</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/training-with-implicit-preference/"><span>Train with Implicit Preference</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/blacklist-items/"><span>Filter Recommended Items by Blacklist in Query</span></a></li><li class="level-3"><a class="final" href="/templates/recommendation/batch-evaluator/"><span>Batch Persistable Evaluator</span></a></li></ul></li><li class="level-2"><a class="expandible" href="#"><span>E-Commerce Recommendation</span></a><ul><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/dase/"><span>DASE</span></a></li><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/how-to/"><span>How-To</span></a></li><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/train-with-rate-event/"><span>Train with Rate Event</span></a></li><li class="level-3"><a class="final" href="/templates/ecommercerecommendation/adjust-score/"><span>Adjust Score</span></a></li></ul></li><li class="level-2"><a class="expandible" href="#"><span>Similar Product</span></a><ul><li class="level-3"><a class="final" href="/templates/similarproduct/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/dase/"><span>DASE</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/how-to/"><span>How-To</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/multi-events-multi-algos/"><span>Multiple Events and Multiple Algorithms</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/return-item-properties/"><span>Returns Item Properties</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/train-with-rate-event/"><span>Train with Rate Event</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/rid-user-set-event/"><span>Get Rid of Events for Users</span></a></li><li class="level-3"><a class="final" href="/templates/similarproduct/recommended-user/"><span>Recommend Users</span></a></li></ul></li><li class="level-2"><a class="expandible" href="#"><span>Classification</span></a><ul><li class="level-3"><a class="final" href="/templates/classification/quickstart/"><span>Quick Start</span></a></li><li class="level-3"><a class="final" href="/templates/classification/dase/"><span>DASE</span></a></li><li class="level-3"><a class="final" href="/templates/classification/how-to/"><span>How-To</span></a></li><li class="level-3"><a class="final" href="/templates/classification/add-algorithm/"><span>Use Alternative Algorithm</span></a></li><li class="level-3"><a class="final" href="/templates/classification/reading-custom-properties/"><span>Read Custom Properties</span></a></li></ul></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Engine Template Gallery</span></a><ul><li class="level-2"><a class="final" href="/gallery/template-gallery/"><span>Browse</span></a></li><li class="level-2"><a class="final" href="/community/submit-template/"><span>Submit your Engine as a Template</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Demo Tutorials</span></a><ul><li class="level-2"><a class="final" href="/community/projects/#demos"><span>Community Contributed Demo</span></a></li><li class="level-2"><a class="final" href="/demo/textclassification/"><span>Text Classification Engine Tutorial</span></a></li></ul></li><li class="level-1"><a class="expandible" href="/community/"><span>Getting Involved</span></a><ul><li class="level-2"><a class="final" href="/community/contribute-code/"><span>Contribute Code</span></a></li><li class="level-2"><a class="final" href="/community/contribute-documentation/"><span>Contribute Documentation</span></a></li><li class="level-2"><a class="final" href="/community/contribute-sdk/"><span>Contribute a SDK</span></a></li><li class="level-2"><a class="final" href="/community/contribute-webhook/"><span>Contribute a Webhook</span></a></li><li class="level-2"><a class="final" href="/community/projects/"><span>Community Projects</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Getting Help</span></a><ul><li class="level-2"><a class="final" href="/resources/faq/"><span>FAQs</span></a></li><li class="level-2"><a class="final" href="/support/"><span>Support</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Resources</span></a><ul><li class="level-2"><a class="final" href="/cli/"><span>Command-line Interface</span></a></li><li class="level-2"><a class="final" href="/resources/release/"><span>Release Cadence</span></a></li><li class="level-2"><a class="final" href="/resources/intellij/"><span>Developing Engines with IntelliJ IDEA</span></a></li><li class="level-2"><a class="final" href="/resources/upgrade/"><span>Upgrade Instructions</span></a></li><li class="level-2"><a class="final" href="/resources/glossary/"><span>Glossary</span></a></li></ul></li><li class="level-1"><a class="expandible" href="#"><span>Apache Software Foundation</span></a><ul><li class="level-2"><a class="final" href="https://www.apache.org/"><span>Apache Homepage</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/licenses/"><span>License</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/foundation/sponsorship.html"><span>Sponsorship</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/foundation/thanks.html"><span>Thanks</span></a></li><li class="level-2"><a class="final" href="https://www.apache.org/security/"><span>Security</span></a></li></ul></li></ul></nav></div><div class="col-md-9 col-sm-12"><div class="content-header hidden-md hidden-lg"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Deploying an Engine</a><span class="spacer">&gt;</span></li><li><span class="last">Engine Server Plugin</span></li></ul></div><div id="page-title"><h1>Engine Server Plugin</h1></div></div><div id="table-of-content-wrapper"><h5>On this page</h5><aside id="table-of-contents"><ul> <li> <a href="#create-an-engine-server-plugin">Create an engine server plugin</a> </li> <li> <a href="#plugin-apis-of-engine-server">Plugin APIs of engine server</a> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/predictionio/tree/livedoc/docs/manual/source/deploy/plugin.html.md"><img src="/images/icons/edit-pencil-d6c1bb3d.png"/>Edit this page</a></div><div class="content-header hidden-sm hidden-xs"><div id="breadcrumbs" class="hidden-sm hidden xs"><ul><li><a href="#">Deploying an Engine</a><span class="spacer">&gt;</span></li><li><span class="last">Engine Server Plugin</span></li></ul></div><div id="page-title"><h1>Engine Server Plugin</h1></div></div><div class="content"> <p>You can write engine server plugins to handle output data. For example, it&#39;s able to transform or log prediction result. There are two types of engine server plugin.</p> <ul> <li><code>Output Blocker</code>: Before predictions go out, they will be processed through all loaded and active plugins. The order of processing is not defined. They are useful for transforming prediction results (e.g. if you do not have access to engine source code).</li> <li><code>Output Sniffer</code>: These should have similar benefits with event server sniffers.</li> </ul> <h2 id='create-an-engine-server-plugin' class='header-anchors'>Create an engine server plugin</h2><p>At first, create a sbt project with following <code>build.sbt</code>:</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<span class="n">version</span> <span class="o">:=</span> <span class="s">"1.0"</span>
<span class="n">scalaVersion</span> <span class="o">:=</span> <span class="s">"2.11.12"</span>
<span class="n">libraryDependencies</span> <span class="o">+=</span> <span class="s">"org.apache.predictionio"</span> <span class="o">%%</span> <span class="s">"apache-predictionio-core"</span> <span class="o">%</span> <span class="s">"0.14.0"</span>
</pre></td></tr></tbody></table> </div> <p>Engine server plug-ins must extend <code>EngineServerPlugin</code>. Here is an example of engine server plug-in:</p><div class="highlight scala"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
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<span class="k">import</span> <span class="nn">org.apache.predictionio.data.storage.EngineInstance</span>
<span class="k">import</span> <span class="nn">org.apache.predictionio.workflow._</span>
<span class="k">import</span> <span class="nn">org.json4s.JValue</span>

<span class="k">class</span> <span class="nc">MyEngineServerPlugin</span> <span class="k">extends</span> <span class="nc">EngineServerPlugin</span> <span class="o">{</span>
  <span class="k">val</span> <span class="n">pluginName</span> <span class="k">=</span> <span class="s">"my-engineserver-plugin"</span>
  <span class="k">val</span> <span class="n">pluginDescription</span> <span class="k">=</span> <span class="s">"an example of engine server plug-in"</span>

  <span class="c1">// inputBlocker or inputSniffer
</span>  <span class="k">val</span> <span class="n">pluginType</span> <span class="k">=</span> <span class="nc">EngineServerPlugin</span><span class="o">.</span><span class="n">outputBlocker</span> 

  <span class="c1">// Plug-in can handle output data in this method.
</span>  <span class="k">override</span> <span class="k">def</span> <span class="n">process</span><span class="o">(</span>
      <span class="n">engineInstance</span><span class="k">:</span> <span class="kt">EngineInstance</span><span class="o">,</span>
      <span class="n">query</span><span class="k">:</span> <span class="kt">JValue</span><span class="o">,</span>
      <span class="n">prediction</span><span class="k">:</span> <span class="kt">JValue</span><span class="o">,</span>
      <span class="n">context</span><span class="k">:</span> <span class="kt">EngineServerPluginContext</span><span class="o">)</span><span class="k">:</span> <span class="kt">JValue</span> <span class="o">=</span> <span class="o">{</span>
    <span class="n">println</span><span class="o">(</span><span class="n">prediction</span><span class="o">)</span>
    <span class="n">prediction</span>
  <span class="o">}</span>

  <span class="c1">// Plug-in can handle requests to /plugins/&lt;pluginType&gt;/&lt;pluginName&gt;/* 
</span>  <span class="c1">// on the engine server in this method.
</span>  <span class="k">override</span> <span class="k">def</span> <span class="n">handleREST</span><span class="o">(</span><span class="n">arguments</span><span class="k">:</span> <span class="kt">Seq</span><span class="o">[</span><span class="kt">String</span><span class="o">])</span><span class="k">:</span> <span class="kt">String</span> <span class="o">=</span> <span class="o">{</span>
     <span class="s">"""{"pluginName": "my-engineserver-plugin"}"""</span>
  <span class="o">}</span>
<span class="o">}</span>
</pre></td></tr></tbody></table> </div> <p>Plug-ins are loaded by <code>ServiceLoader</code>, so you must create <code>META-INF/services/org.apache.predictionio.workflow.EngineServerPlugin</code> with a following content: </p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre>com.example.MyEngineServerPlugin
</pre></td></tr></tbody></table> </div> <p>Then, run <code>sbt package</code> to package plugin as a jar file. In this case, the plugin jar file is generated at <code>target/scala-2.11/pio-plugin-example_2.11-1.0.jar</code>, so copy this file to <code>PIO_HOME/plugins</code>.</p><p>To enable plugins, you have to modify <code>engine.json</code> in the root directory of your engine as follows. Defined plugins parameters can be accessed via <code>EngineServerPluginContext</code> in plugins.</p><div class="highlight json"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
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  </span><span class="s2">"id"</span><span class="p">:</span><span class="w"> </span><span class="s2">"default"</span><span class="p">,</span><span class="w">
  </span><span class="s2">"description"</span><span class="p">:</span><span class="w"> </span><span class="s2">"Default settings"</span><span class="p">,</span><span class="w">
  </span><span class="s2">"engineFactory"</span><span class="p">:</span><span class="w"> </span><span class="s2">"org.example.recommendation.RecommendationEngine"</span><span class="p">,</span><span class="w">
  </span><span class="s2">"plugins"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
    </span><span class="s2">"my-engineserver-plugin"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
      </span><span class="s2">"enabled"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="w">
    </span><span class="p">}</span><span class="w">
  </span><span class="p">},</span><span class="w">
  </span><span class="err">...</span><span class="w">
</span><span class="err">}</span><span class="w">
</span></pre></td></tr></tbody></table> </div> <p>When you start (or restart) the engine server, this plugin should be enabled.</p><h2 id='plugin-apis-of-engine-server' class='header-anchors'>Plugin APIs of engine server</h2><p>The engine server has some plugins related APIs:</p> <ul> <li><code>/plugins.json</code>: Show all enabled plugins.</li> <li><code>/plugins/outputblocker/&lt;pluginName&gt;/*</code>: Handled by a corresponding output blocker plugin.</li> <li><code>/plugins/outputsniffer/&lt;pluginName&gt;/*</code>: Handled by a corresponding output sniffer plugin.</li> </ul> <p>For example, if you send following request to the engine server:</p><div class="highlight shell"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1</pre></td><td class="code"><pre>curl -XGET http://localhost:7070/plugins.json?accessKey<span class="o">=</span><span class="nv">$ACCESS_KEY</span>
</pre></td></tr></tbody></table> </div> <p>The engine server should respond following JSON response:</p><div class="highlight json"><table style="border-spacing: 0"><tbody><tr><td class="gutter gl" style="text-align: right"><pre class="lineno">1
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15</pre></td><td class="code"><pre><span class="p">{</span><span class="w">
  </span><span class="s2">"plugins"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
    </span><span class="s2">"outputblockers"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
      </span><span class="s2">"my-engineserver-plugin"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
        </span><span class="s2">"name"</span><span class="p">:</span><span class="w"> </span><span class="s2">"my-engineserver-plugin"</span><span class="p">,</span><span class="w">
        </span><span class="s2">"description"</span><span class="p">:</span><span class="w"> </span><span class="s2">"an example of engine server plug-in"</span><span class="p">,</span><span class="w">
        </span><span class="s2">"class"</span><span class="p">:</span><span class="w"> </span><span class="s2">"com.example.MyEngineServerPlugin"</span><span class="p">,</span><span class="w">
        </span><span class="s2">"params"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
          </span><span class="s2">"enabled"</span><span class="p">:</span><span class="w"> </span><span class="kc">true</span><span class="w">
        </span><span class="p">}</span><span class="w">
      </span><span class="p">}</span><span class="w">
    </span><span class="p">},</span><span class="w">
    </span><span class="s2">"outputsniffers"</span><span class="p">:</span><span class="w"> </span><span class="p">{}</span><span class="w">
  </span><span class="p">}</span><span class="w">
</span><span class="p">}</span><span class="w">
</span></pre></td></tr></tbody></table> </div> </div></div></div></div><footer><div class="container"><div class="seperator"></div><div class="row"><div class="col-md-6 footer-link-column"><div class="footer-link-column-row"><h4>Community</h4><ul><li><a href="//predictionio.apache.org/install/" target="blank">Download</a></li><li><a href="//predictionio.apache.org/" target="blank">Docs</a></li><li><a href="//github.com/apache/predictionio" target="blank">GitHub</a></li><li><a href="mailto:user-subscribe@predictionio.apache.org" target="blank">Subscribe to User Mailing List</a></li><li><a href="//stackoverflow.com/questions/tagged/predictionio" target="blank">Stackoverflow</a></li></ul></div></div><div class="col-md-6 footer-link-column"><div class="footer-link-column-row"><h4>Contribute</h4><ul><li><a href="//predictionio.apache.org/community/contribute-code/" target="blank">Contribute</a></li><li><a href="//github.com/apache/predictionio" target="blank">Source Code</a></li><li><a href="//issues.apache.org/jira/browse/PIO" target="blank">Bug Tracker</a></li><li><a href="mailto:dev-subscribe@predictionio.apache.org" target="blank">Subscribe to Development Mailing List</a></li></ul></div></div></div><div class="row"><div class="col-md-12 footer-link-column"><p>Apache PredictionIO, PredictionIO, Apache, the Apache feather logo, and the Apache PredictionIO project logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</p><p>All other marks mentioned may be trademarks or registered trademarks of their respective owners.</p></div></div></div><div id="footer-bottom"><div class="container"><div class="row"><div class="col-md-12"><div id="footer-logo-wrapper"><img alt="PredictionIO" src="/images/logos/logo-white-d1e9c6e6.png"/><span>®</span></div><div id="social-icons-wrapper"><a class="github-button" href="https://github.com/apache/predictionio" data-icon="octicon-star" data-show-count="true" aria-label="Star apache/predictionio on GitHub">Star</a> <a class="github-button" href="https://github.com/apache/predictionio/fork" data-icon="octicon-repo-forked" data-show-count="true" aria-label="Fork apache/predictionio on GitHub">Fork</a> <script id="github-bjs" async="" defer="" src="https://buttons.github.io/buttons.js"></script><a href="https://twitter.com/predictionio" target="blank"><img alt="PredictionIO on Twitter" src="/images/icons/twitter-ea9dc152.png"/></a> <a href="https://www.facebook.com/predictionio" target="blank"><img alt="PredictionIO on Facebook" src="/images/icons/facebook-5c57939c.png"/></a> </div></div></div></div></div></footer></div><script>(function(w,d,t,u,n,s,e){w['SwiftypeObject']=n;w[n]=w[n]||function(){
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