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  <section id="spi-overview">
<h1 id="develop-spi-overview--page-root">SPI overview<a class="headerlink" href="#develop-spi-overview--page-root" title="Permalink to this heading">#</a></h1>
<p>When you implement a new Trino plugin, you implement interfaces and
override methods defined by the Service Provider Interface (SPI).</p>
<p>Plugins can provide additional:</p>
<ul class="simple">
<li><p><a class="reference internal" href="connectors.html"><span class="doc">Connectors</span></a>,</p></li>
<li><p>block encodings,</p></li>
<li><p><a class="reference internal" href="types.html"><span class="doc">Types</span></a>,</p></li>
<li><p><a class="reference internal" href="functions.html"><span class="doc">Functions</span></a>,</p></li>
<li><p><a class="reference internal" href="system-access-control.html"><span class="doc">System access control</span></a>,</p></li>
<li><p><a class="reference internal" href="group-provider.html"><span class="doc">Group provider</span></a>,</p></li>
<li><p><a class="reference internal" href="password-authenticator.html"><span class="doc">Password authenticator</span></a>,</p></li>
<li><p><a class="reference internal" href="header-authenticator.html"><span class="doc">Header authenticator</span></a>,</p></li>
<li><p><a class="reference internal" href="certificate-authenticator.html"><span class="doc">Certificate authenticator</span></a>,</p></li>
<li><p><a class="reference internal" href="event-listener.html"><span class="doc">Event listener</span></a>,</p></li>
<li><p>resource group configuration managers,</p></li>
<li><p>session property configuration managers,</p></li>
<li><p>and exchange managers.</p></li>
</ul>
<p>In particular, connectors are the source of all data for queries in
Trino: they back each catalog available to Trino.</p>
<section id="code">
<h2 id="code">Code<a class="headerlink" href="#code" title="Permalink to this heading">#</a></h2>
<p>The SPI source can be found in the <code class="docutils literal notranslate"><span class="pre">core/trino-spi</span></code> directory in the Trino
source tree.</p>
</section>
<section id="plugin-metadata">
<h2 id="plugin-metadata">Plugin metadata<a class="headerlink" href="#plugin-metadata" title="Permalink to this heading">#</a></h2>
<p>Each plugin identifies an entry point: an implementation of the
<code class="docutils literal notranslate"><span class="pre">Plugin</span></code> interface. This class name is provided to Trino via
the standard Java <code class="docutils literal notranslate"><span class="pre">ServiceLoader</span></code> interface: the classpath contains
a resource file named <code class="docutils literal notranslate"><span class="pre">io.trino.spi.Plugin</span></code> in the
<code class="docutils literal notranslate"><span class="pre">META-INF/services</span></code> directory. The content of this file is a
single line listing the name of the plugin class:</p>
<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>com.example.plugin.ExamplePlugin
</pre></div>
</div>
<p>For a built-in plugin that is included in the Trino source code,
this resource file is created whenever the <code class="docutils literal notranslate"><span class="pre">pom.xml</span></code> file of a plugin
contains the following line:</p>
<div class="highlight-xml notranslate"><div class="highlight"><pre><span></span><span class="nt">&lt;packaging&gt;</span>trino-plugin<span class="nt">&lt;/packaging&gt;</span>
</pre></div>
</div>
</section>
<section id="plugin">
<h2 id="plugin">Plugin<a class="headerlink" href="#plugin" title="Permalink to this heading">#</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">Plugin</span></code> interface is a good starting place for developers looking
to understand the Trino SPI. It contains access methods to retrieve
various classes that a Plugin can provide. For example, the <code class="docutils literal notranslate"><span class="pre">getConnectorFactories()</span></code>
method is a top-level function that Trino calls to retrieve a <code class="docutils literal notranslate"><span class="pre">ConnectorFactory</span></code> when Trino
is ready to create an instance of a connector to back a catalog. There are similar
methods for <code class="docutils literal notranslate"><span class="pre">Type</span></code>, <code class="docutils literal notranslate"><span class="pre">ParametricType</span></code>, <code class="docutils literal notranslate"><span class="pre">Function</span></code>, <code class="docutils literal notranslate"><span class="pre">SystemAccessControl</span></code>, and
<code class="docutils literal notranslate"><span class="pre">EventListenerFactory</span></code> objects.</p>
</section>
<section id="building-plugins-via-maven">
<h2 id="building-plugins-via-maven">Building plugins via Maven<a class="headerlink" href="#building-plugins-via-maven" title="Permalink to this heading">#</a></h2>
<p>Plugins depend on the SPI from Trino:</p>
<div class="highlight-xml notranslate"><div class="highlight"><pre><span></span><span class="nt">&lt;dependency&gt;</span>
    <span class="nt">&lt;groupId&gt;</span>io.trino<span class="nt">&lt;/groupId&gt;</span>
    <span class="nt">&lt;artifactId&gt;</span>trino-spi<span class="nt">&lt;/artifactId&gt;</span>
    <span class="nt">&lt;scope&gt;</span>provided<span class="nt">&lt;/scope&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
</pre></div>
</div>
<p>The plugin uses the Maven <code class="docutils literal notranslate"><span class="pre">provided</span></code> scope because Trino provides
the classes from the SPI at runtime and thus the plugin should not
include them in the plugin assembly.</p>
<p>There are a few other dependencies that are provided by Trino,
including Slice and Jackson annotations. In particular, Jackson is
used for serializing connector handles and thus plugins must use the
annotations version provided by Trino.</p>
<p>All other dependencies are based on what the plugin needs for its
own implementation. Plugins are loaded in a separate class loader
to provide isolation and to allow plugins to use a different version
of a library that Trino uses internally.</p>
<p>For an example <code class="docutils literal notranslate"><span class="pre">pom.xml</span></code> file, see the example HTTP connector in the
<code class="docutils literal notranslate"><span class="pre">plugin/trino-example-http</span></code> directory in the Trino source tree.</p>
</section>
<section id="deploying-a-custom-plugin">
<h2 id="deploying-a-custom-plugin">Deploying a custom plugin<a class="headerlink" href="#deploying-a-custom-plugin" title="Permalink to this heading">#</a></h2>
<p>Because Trino plugins use the <code class="docutils literal notranslate"><span class="pre">trino-plugin</span></code> packaging type, building
a plugin will create a ZIP file in the <code class="docutils literal notranslate"><span class="pre">target</span></code> directory. This file
contains the plugin JAR and all its dependencies JAR files.</p>
<p>In order to add a custom plugin to a Trino installation, extract the plugin
ZIP file and move the extracted directory into the Trino plugin directory.
For example, for a plugin called <code class="docutils literal notranslate"><span class="pre">my-functions</span></code>, with a version of 1.0,
you would extract <code class="docutils literal notranslate"><span class="pre">my-functions-1.0.zip</span></code> and then move <code class="docutils literal notranslate"><span class="pre">my-functions-1.0</span></code>
to <code class="docutils literal notranslate"><span class="pre">my-functions</span></code> in the Trino plugin directory.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Every Trino plugin should be in a separate directory. Do not put JAR files
directly into the <code class="docutils literal notranslate"><span class="pre">plugin</span></code> directory. Plugins should only contain JAR files,
so any subdirectories will not be traversed and will be ignored.</p>
</div>
<p>By default, the plugin directory is the <code class="docutils literal notranslate"><span class="pre">plugin</span></code> directory relative to the
directory in which Trino is installed, but it is configurable using the
configuration variable <code class="docutils literal notranslate"><span class="pre">plugin.dir</span></code>. In order for Trino to pick up
the new plugin, you must restart Trino.</p>
<p>Plugins must be installed on all nodes in the Trino cluster (coordinator and workers).</p>
</section>
</section>


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