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<article data-swiftype-index='true'>
<a class='edit-link' href="https://github.com/apache/ignite/tree/IGNITE-7595/docs/_docs/plugins.adoc" target="_blank">Edit</a>
<h1>Plugins</h1>
<div class="sect1">
<h2 id="overview">Overview</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The Ignite plugin system allows you to extend the core functionality of Ignite.
Plugins have access to different internal Ignite components, such as security processor and others, and can extend the programmatic API of Ignite.</p>
</div>
<div class="paragraph">
<p>To add a custom plugin, implement the <code>PluginProvider</code> interface and register the implementation in the node configuration.
The following is an overview of the steps involved in creating a plugin:</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Implement the <code>PluginProvider</code> interface. This is the main interface for creating plugins.</p>
</li>
<li>
<p>Implement the <code>IgnitePlugin</code> interface. If your plugin adds functionality that is meant to be triggered by end users, you should add public methods to this class. An instance of this class is available to end users at runtime via <code>Ignite.plugin(String pluginName)</code>.</p>
</li>
<li>
<p>Register the plugin in <code>IgniteConfiguration.setPluginProviders(&#8230;&#8203;)</code> either programmatically or via XML configuration.</p>
</li>
<li>
<p>If your plugin has a public API, call <code>MyPlugin plugin = Ignite.plugin(pluginName)</code> at runtime and execute specific actions.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>The following section gives an example of a plugin and goes into details about how plugins work in Ignite.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="example-plugin">Example Plugin</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Let&#8217;s create a simple Ignite plugin that prints information about the number of entries in every cache to the console periodically, on each node.
In addition, it exposes a public method that the users can call programmatically from their application to print the cache size information on demand.
The plugin has one configuration parameter: the time interval for printing the cache size information.</p>
</div>
<div class="sect2">
<h3 id="1-implement-pluginprovider">1. Implement PluginProvider</h3>
<div class="paragraph">
<p><code>PluginProvider</code> is the main interface for creating Ignite plugins.
Ignite calls the methods of each registered plugin provider during initialization.</p>
</div>
<div class="paragraph">
<p>The following methods must return non-null values. Other methods are optional.</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>name()</code> - returns the name of the plugin</p>
</li>
<li>
<p><code>plugin()</code> - returns the object of your plugin class</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Below is an example implementation of a plugin provider.
We create an object of <code>MyPlugin</code> class (see next step) in the <code>initExtensions()</code> method.
Ignite passes a <code>PluginContext</code> object as an argument to this method.
<code>PluginContext</code> provides access to the Ignite APIs and node configuration.
See the <a href="https://ignite.apache.org/releases/2.9.0/javadoc/org/apache/ignite/plugin/PluginContext.html" target="_blank" rel="noopener">PluginContext</a> javadoc for more information.
Here we simply pass the <code>PluginContext</code> and the time interval to the <code>MyPlugin</code> constructor.</p>
</div>
<div class="listingblock">