<!DOCTYPE html><html><head><title>Event 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="Event Server Plugin"/><link rel="canonical" href="https://predictionio.apache.org/datacollection/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="last">Event Server Plugin</span></li></ul></div><div id="page-title"><h1>Event 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-event-server-plugin">Create an event server plugin</a> </li> <li> <a href="#plugin-apis-of-event-server">Plugin APIs of event server</a> </li> </ul> </aside><hr/><a id="edit-page-link" href="https://github.com/apache/predictionio/tree/livedoc/docs/manual/source/datacollection/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="#">Collecting and Analyzing Data</a><span class="spacer">&gt;</span></li><li><span class="last">Event Server Plugin</span></li></ul></div><div id="page-title"><h1>Event Server Plugin</h1></div></div><div class="content"> <p>You can write event server plugins to handle input data. For example, it&#39;s able to block invalid data, log, get statics or forward to other processing systems. There are two types of event server plugin.</p> <ul> <li><code>Input Blocker</code>: When these plugins are present, events coming into event server will be passed through all loaded and active plugins before reaching the actual event store. The order of processing is not defined, so events can go through these plugins in arbitrary order. One use case is for validating input data and throw exceptions to prevent bad data from going in. These plugins cannot transform the event.</li> <li><code>Input Sniffer</code>: When these are present, events will be broadcasted to these plugins in parallel. They do not block the event from reaching event store. They are useful for logging, statistics, and forwarding to other processing systems.</li> </ul> <h2 id='create-an-event-server-plugin' class='header-anchors'>Create an event 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>Event server plug-ins must extend <code>EventServerPlugin</code>. Here is an example of event 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.api._</span>

<span class="k">class</span> <span class="nc">MyEventServerPlugin</span> <span class="k">extends</span> <span class="nc">EventServerPlugin</span> <span class="o">{</span>
  <span class="k">val</span> <span class="n">pluginName</span> <span class="k">=</span> <span class="s">"my-eventserver-plugin"</span>
  <span class="k">val</span> <span class="n">pluginDescription</span> <span class="k">=</span> <span class="s">"an example of event 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">EventServerPlugin</span><span class="o">.</span><span class="n">inputBlocker</span>   

  <span class="c1">// Plug-in can handle input data in this method.
</span>  <span class="c1">// If plug-in found invalid data, it's possible to block them 
</span>  <span class="c1">// by throwing an exception 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">eventInfo</span><span class="k">:</span> <span class="kt">EventInfo</span><span class="o">,</span> 
      <span class="n">context</span><span class="k">:</span> <span class="kt">EventServerPluginContext</span><span class="o">)</span><span class="k">:</span> <span class="kt">Unit</span> <span class="o">=</span> <span class="o">{</span>
    <span class="n">println</span><span class="o">(</span><span class="n">eventInfo</span><span class="o">)</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 event 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">appId</span><span class="k">:</span> <span class="kt">Int</span><span class="o">,</span> 
      <span class="n">channelId</span><span class="k">:</span> <span class="kt">Option</span><span class="o">[</span><span class="kt">Int</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-eventserver-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.data.api.EventServerPlugin</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.MyEventServerPlugin
</pre></td></tr></tbody></table> </div> <p>Finally, 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>When you start (or restart) the event server, this plugin should be enabled.</p><h2 id='plugin-apis-of-event-server' class='header-anchors'>Plugin APIs of event server</h2><p>The event server has some plugins related APIs:</p> <ul> <li><code>/plugins.json</code>: Show all enabled plugins.</li> <li><code>/plugins/inputblocker/&lt;pluginName&gt;/*</code>: Handled by a corresponding input blocker plugin.</li> <li><code>/plugins/inputsniffer/&lt;pluginName&gt;/*</code>: Handled by a corresponding input sniffer plugin.</li> </ul> <p>For example, if you send following request to the event 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 event 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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  </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">"inputblockers"</span><span class="p">:</span><span class="w"> </span><span class="p">{</span><span class="w">
      </span><span class="s2">"my-eventserver-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-eventserver-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 event 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.MyEventServerPlugin"</span><span class="w">
      </span><span class="p">}</span><span class="w">
    </span><span class="p">},</span><span class="w">
    </span><span class="s2">"inputsniffers"</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">
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