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| <h1 class="title">Fuseki Modules</h1> |
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| <main class="d-flex flex-xl-row flex-column"> |
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| <li> |
| <ul> |
| <li><a href="#automatically-loaded">Automatically loaded</a></li> |
| <li><a href="#programmaticaly-configuring-a-server">Programmaticaly configuring a server</a></li> |
| <li><a href="#fuseki-module-operations">Fuseki Module operations</a></li> |
| <li><a href="#fusekimodule-interface"><code>FusekiModule</code> interface</a></li> |
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| <article class="flex-column me-lg-4"> |
| <p><em>Fuseki modules</em> are a mechanism to include extension code into a Fuseki |
| server. Modules are invoked during the process of building a <a href="./fuseki-main.html">Fuseki |
| Main</a> server. A module can modify the server |
| configuration, add new functionality, or react to a server being built and |
| started.</p> |
| <p>This feature was added in Jena version 4.3.0. It is an experimental feature |
| that will evolve based on feedback and use cases.</p> |
| <p>The interface for modules is <code>FusekiModule</code>; if automatcally loaded, the |
| interface is <code>FusekiAutoModule</code> which extends <code>FusekiModule</code>.</p> |
| <p>Fuseki modules can be provided in two ways:</p> |
| <ul> |
| <li>Loaded from additional jars on the classpath</li> |
| <li>Programmatically controlling the setup of the <code>FusekiServer</code> server.</li> |
| </ul> |
| <h3 id="automatically-loaded">Automatically loaded</h3> |
| <p>Fuseki Modules can be loaded using the JDK |
| <a href="https://www.baeldung.com/java-spi">ServiceLoader</a> by being placing |
| a jar file on the classpath, |
| together with any additional dependencies. These provide interface |
| <code>FusekiAutoModule</code>. |
| The service loader is controlled by file resources |
| <code>META-INF/services/org.apache.jena.fuseki.main.sys.FusekiAutoModule</code> in the jar |
| file. |
| The module class must have a no-argument constructor.</p> |
| <p>This is often done by placing the file in the development code in |
| <code>src/main/resources/META-INF/services/</code>). |
| The file containing a line with the implementation full class name. If |
| <a href="../notes/jena-repack.html">repacking</a> Fuseki with the maven-shade-plugin, make |
| sure the <code>ServicesResourceTransformer</code> is used.</p> |
| <p>The method <code>start</code> is called when the module is loaded. Custom operations can |
| be globally registered at this point (see the <a href="https://github.com/apache/jena/tree/main/jena-fuseki2/jena-fuseki-main/src/test/java/org/apache/jena/fuseki/main/examples">Fuseki |
| examples</a> directory).</p> |
| <p>A <code>FusekiAutoModule</code> can provide a level, an integer, to control the order in which |
| modules are invoked during server building. Lower numbers are invoked before larger |
| numbers at each step.</p> |
| <h3 id="programmaticaly-configuring-a-server">Programmaticaly configuring a server</h3> |
| <p>If creating a Fuseki server from Java, the modules can be autoloaded as described above, |
| or explicitly added to the server builder.</p> |
| <p>A <code>FusekiModules</code> object is collection of modules, called at each point in the order |
| given when creating the object.</p> |
| <pre tabindex="0"><code> FusekiModule myModule = new MyModule(); |
| FusekiModules fmods = FusekiModules.create(myModule); |
| FusekiServer server = FusekiServer.create() |
| ... |
| .fusekiModules(fmods) |
| ... |
| .build(); |
| </code></pre><h3 id="fuseki-module-operations">Fuseki Module operations</h3> |
| <p>The module lifecycle during creating a Fuseki server is:</p> |
| <ul> |
| <li><code>prepare</code> - called at the start of the server |
| build steps before setting up the datasets.</li> |
| <li><code>configured</code> - access and modify the setup. |
| This is called after the server has been configured, before the server is built. |
| It defaults to calls to <code>configDataAccessPoint</code> for dataset being hosted by the server.</li> |
| <li><code>server</code> - called after the built, before the return of <code>FusekiServerBuilder.build()</code></li> |
| </ul> |
| <p>There are also operations notified when a server is reloaded while running.</p> |
| <ul> |
| <li><code>serverConfirmReload</code></li> |
| <li><code>serveReload</code></li> |
| </ul> |
| <p>As of Jena 4.9.0, eeload is not yet supported.</p> |
| <p>The Fuseki start up sequence is:</p> |
| <ul> |
| <li><code>serverBeforeStarting</code> - called at the start of <code>server.start()</code></li> |
| <li><code>serverAfterStarting</code> - called at the end of <code>server.start()</code></li> |
| <li><code>serverStopped</code> - called as just after the server |
| has stopped in the <code>server.stop()</code> call. |
| (note, this is not always called because a server can simply exit the JVM).</li> |
| </ul> |
| <p>A Fuseki module does not need to implement all these steps. The default for all |
| steps is “do nothing”. Usually, an extension will only be interested in |
| certain steps, such as <code>prepare</code>, or the registry information of |
| <code>configuration</code>.</p> |
| <p>During the configuration step, the Fuseki configuration file for the server is |
| available. If the server is built programmatically without a configuration file, |
| this is null.</p> |
| <p>The configuration file can contain RDF information to build resources (e.g. |
| it can contain additional assembler descriptions not directly linked to the server).</p> |
| <p>There is an <a href="https://github.com/apache/jena/blob/main/jena-fuseki2/jena-fuseki-main/src/test/java/org/apache/jena/fuseki/main/examples/ExFusekiMain_3_FusekiModule.java">example Fuseki |
| Module</a> |
| in the Fuseki examples directory.</p> |
| <h3 id="fusekimodule-interface"><code>FusekiModule</code> interface</h3> |
| <div class="highlight"><pre tabindex="0" style="background-color:#f8f8f8;-moz-tab-size:4;-o-tab-size:4;tab-size:4;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Module interface for Fuseki. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * <p> |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * A module is additional code, usually in a separate jar, |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * but can also be part of the application code. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span><span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">interface</span> <span style="color:#00f">FusekiModule</span> <span style="color:#a2f;font-weight:bold">extends</span> SubsystemLifecycle <span style="color:#666">{</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Display name to identify this module. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> String <span style="color:#00a000">name</span><span style="color:#666">();</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">// -- Build cycle. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"></span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Called at the start of "build" step. The builder has been set according to the |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * configuration of API calls and parsing configuration files. No build actions have been carried out yet. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * The module can make further FusekiServer.{@link Builder} calls. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * The "configModel" parameter is set if a configuration file was used otherwise it is null. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">prepare</span><span style="color:#666">(</span>FusekiServer<span style="color:#666">.</span><span style="color:#b44">Builder</span> serverBuilder<span style="color:#666">,</span> Set<span style="color:#666"><</span>String<span style="color:#666">></span> datasetNames<span style="color:#666">,</span> Model configModel<span style="color:#666">)</span> <span style="color:#666">;</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Called after the DataAccessPointRegistry has been built. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * <p> |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * The default implementation is to call {@link #configDataAccessPoint(DataAccessPoint, Model)} |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * for each {@link DataAccessPoint}. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * <pre> |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * dapRegistry.accessPoints().forEach(accessPoint{@literal ->}configDataAccessPoint(accessPoint, configModel)); |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * </pre> |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">configured</span><span style="color:#666">(</span>FusekiServer<span style="color:#666">.</span><span style="color:#b44">Builder</span> serverBuilder<span style="color:#666">,</span> DataAccessPointRegistry dapRegistry<span style="color:#666">,</span> Model configModel<span style="color:#666">)</span> <span style="color:#666">{</span> |
| </span></span><span style="display:flex;"><span> dapRegistry<span style="color:#666">.</span><span style="color:#b44">accessPoints</span><span style="color:#666">().</span><span style="color:#b44">forEach</span><span style="color:#666">(</span>accessPoint<span style="color:#666">-></span>configDataAccessPoint<span style="color:#666">(</span>accessPoint<span style="color:#666">,</span> configModel<span style="color:#666">));</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * This method is called for each {@link DataAccessPoint} by the default |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * implementation of {@link #configured} after the new servers |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * DataAccessPointRegistry has been built. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">configDataAccessPoint</span><span style="color:#666">(</span>DataAccessPoint dap<span style="color:#666">,</span> Model configModel<span style="color:#666">)</span> <span style="color:#666">{}</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Built, not started, about to be returned to the builder caller. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">server</span><span style="color:#666">(</span>FusekiServer server<span style="color:#666">)</span> <span style="color:#666">{</span> <span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Confirm or reject a request to reload. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">boolean</span> <span style="color:#00a000">serverConfirmReload</span><span style="color:#666">(</span>FusekiServer server<span style="color:#666">)</span> <span style="color:#666">{</span> <span style="color:#a2f;font-weight:bold">return</span> <span style="color:#a2f;font-weight:bold">true</span><span style="color:#666">;</span> <span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Perform any operations necessary for a reload. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">serverReload</span><span style="color:#666">(</span>FusekiServer server<span style="color:#666">)</span> <span style="color:#666">{</span> <span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">// -- Server start up |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"></span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Server starting - called just before server.start happens. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">serverBeforeStarting</span><span style="color:#666">(</span>FusekiServer server<span style="color:#666">)</span> <span style="color:#666">{</span> <span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Server started - called just after server.start happens, and before server |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * .start() returns to the application. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">serverAfterStarting</span><span style="color:#666">(</span>FusekiServer server<span style="color:#666">)</span> <span style="color:#666">{</span> <span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** Server stopping. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Do not rely on this to clear up external resources. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * Usually there is no stop phase and the JVM just exits or is killed externally. |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> * |
| </span></span></span><span style="display:flex;"><span><span style="color:#080;font-style:italic"> */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">serverStopped</span><span style="color:#666">(</span>FusekiServer server<span style="color:#666">)</span> <span style="color:#666">{</span> <span style="color:#666">}</span> |
| </span></span><span style="display:flex;"><span> |
| </span></span><span style="display:flex;"><span> <span style="color:#080;font-style:italic">/** Module unloaded : do not rely on this happening. */</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f">@Override</span> |
| </span></span><span style="display:flex;"><span> <span style="color:#a2f;font-weight:bold">public</span> <span style="color:#a2f;font-weight:bold">default</span> <span style="color:#0b0;font-weight:bold">void</span> <span style="color:#00a000">stop</span><span style="color:#666">()</span> <span style="color:#666">{}</span> |
| </span></span><span style="display:flex;"><span><span style="color:#666">}</span> |
| </span></span></code></pre></div><p><code>FusekiAutoModules</code> also provide the |
| <a href="https://jena.apache.org/documentation/javadoc/jena/org.apache.jena.core/org/apache/jena/sys/JenaSubsystemLifecycle.html"><code>org.apache.jena.base.module.SubsystemLifecycle</code></a> |
| interface.</p> |
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