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Extending_WildFly.html
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<title>Extending WildFly</title>
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<body id="Extending_WildFly" class="book toc2 toc-left">
<div id="header">
<h1>Extending WildFly</h1>
<div class="details">
<span id="author" class="author">WildFly code development team</span><br>
<span id="revnumber">version 35.0.0.Final,</span>
<span id="revdate">2025-01-07T23:37:39Z</span>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Extending WildFly</div>
<ul class="sectlevel1">
<li><a href="#target-audience">1. Target Audience</a>
<ul class="sectlevel2">
<li><a href="#prerequisites">1.1. Prerequisites</a></li>
<li><a href="#examples-in-this">1.2. Examples in this guide</a></li>
</ul>
</li>
<li><a href="#Example_subsystem">2. Example subsystem</a>
<ul class="sectlevel2">
<li><a href="#create-the-skeleton-project">2.1. Create the skeleton project</a></li>
<li><a href="#create-the-schema">2.2. Create the schema</a></li>
<li><a href="#design-and-define-the-model-structure">2.3. Design and define the model structure</a></li>
<li><a href="#parsing-and-marshalling-of-the-subsystem-xml">2.4. Parsing and marshalling of the subsystem xml</a></li>
<li><a href="#add-the-deployers">2.5. Add the deployers</a></li>
<li><a href="#integrate-with-wildfly">2.6. Integrate with WildFly</a></li>
<li><a href="#expressions">2.7. Expressions</a></li>
</ul>
</li>
<li><a href="#Working_with_WildFly_Capabilities">3. Working with WildFly Capabilities</a>
<ul class="sectlevel2">
<li><a href="#capabilities">3.1. Capabilities</a></li>
<li><a href="#capability-contract">3.2. Capability Contract</a></li>
<li><a href="#capability-registry">3.3. Capability Registry</a></li>
<li><a href="#using-capabilities">3.4. Using Capabilities</a></li>
</ul>
</li>
<li><a href="#Domain_Mode_Subsystem_Transformers">4. Domain Mode Subsystem Transformers</a>
<ul class="sectlevel2">
<li><a href="#background">4.1. Background</a></li>
<li><a href="#versions-and-backward-compatibility">4.2. Versions and backward compatibility</a></li>
<li><a href="#the-role-of-transformers">4.3. The role of transformers</a></li>
<li><a href="#how-do-i-know-what-needs-to-be-transformed">4.4. How do I know what needs to be transformed?</a></li>
<li><a href="#how-do-i-write-a-transformer">4.5. How do I write a transformer?</a></li>
<li><a href="#evolving-transformers-with-subsystem-modelversions">4.6. Evolving transformers with subsystem ModelVersions</a></li>
<li><a href="#testing-transformers">4.7. Testing transformers</a></li>
<li><a href="#common-transformation-use-cases">4.8. Common transformation use-cases</a></li>
</ul>
</li>
<li><a href="#Key_Interfaces_and_Classes_Relevant_to_Extension_Developers">5. Key Interfaces and Classes Relevant to Extension Developers</a>
<ul class="sectlevel2">
<li><a href="#extension-interface">5.1. Extension Interface</a></li>
<li><a href="#wildfly-managed-resources">5.2. WildFly Managed Resources</a></li>
<li><a href="#managementresourceregistration-interface">5.3. ManagementResourceRegistration Interface</a></li>
<li><a href="#resourcedefinition-interface">5.4. ResourceDefinition Interface</a></li>
<li><a href="#attributedefinition-class">5.5. AttributeDefinition Class</a></li>
<li><a href="#operationdefinition-and-operationstephandler-interfaces">5.6. OperationDefinition and OperationStepHandler Interfaces</a></li>
<li><a href="#operation-execution-and-the-operationcontext">5.7. Operation Execution and the OperationContext</a></li>
<li><a href="#resource-interface">5.8. Resource Interface</a></li>
<li><a href="#deploymentunitprocessor-interface">5.9. DeploymentUnitProcessor Interface</a></li>
<li><a href="#useful-classes-for-implementing-operationstephandler">5.10. Useful classes for implementing OperationStepHandler</a></li>
</ul>
</li>
<li><a href="#WildFly_JNDI_Implementation">6. WildFly JNDI Implementation</a>
<ul class="sectlevel2">
<li><a href="#introduction">6.1. Introduction</a></li>
<li><a href="#architecture">6.2. Architecture</a></li>
<li><a href="#binding-apis">6.3. Binding APIs</a></li>
<li><a href="#resource-ref-processing">6.4. Resource Ref Processing</a></li>
</ul>
</li>
<li><a href="#CLI_extensibility_for_layered_products">7. CLI extensibility for layered products</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>In this document we provide an example of how to extend the kernel
functionality of WildFly via an extension and the subsystem it installs.
The WildFly kernel is very simple and lightweight; most of the
capabilities people associate with an application server are provided
via extensions and their subsystems. The WildFly distribution includes
many extensions and subsystems; the webserver integration is via a
subsystem; the transaction manager integration is via a subsystem, the
Jakarta Enterprise Beans container integration is via a subsystem, etc.</p>
</div>
<div class="paragraph">
<p>This document is divided into two main sections. The
<a href="Extending_WildFly.html#Example_subsystem">first</a> is focused on learning by doing. This
section will walk you through the steps needed to create your own
subsystem, and will touch on most of the concepts discussed elsewhere in
this guide. The
<a href="Extending_WildFly.html#Key_Interfaces_and_Classes_Relevant_to_Extension_Developers">second</a>
focuses on a conceptual overview of the key interfaces and classes
described in the example. Readers should feel free to start with the
second section if that better fits their learning style. Jumping back
and forth between the sections is also a good strategy.</p>
</div>
<!-- toc disabled -->
</div>
</div>
<div class="sect1">
<h2 id="target-audience"><a class="anchor" href="#target-audience"></a>1. Target Audience</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="prerequisites"><a class="anchor" href="#prerequisites"></a>1.1. Prerequisites</h3>
<div class="paragraph">
<p>You should know how to download, install and run WildFly. If not please
consult the <a href="Getting_Started_Guide.html">Getting Started Guide</a>. You
should also be familiar with the management concepts from the
<a href="Admin_Guide.html">Admin Guide</a>, particularly the
<a href="Admin_Guide.html#Core_management_concepts">Core management concepts</a> section and
you need Java development experience to follow the example in this
guide.</p>
</div>
</div>
<div class="sect2">
<h3 id="examples-in-this"><a class="anchor" href="#examples-in-this"></a>1.2. Examples in this guide</h3>
<div class="paragraph">
<p>Most of the examples in this guide are being expressed as excerpts of
the XML configuration files or by using a representation of the de-typed
management model.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="Example_subsystem"><a class="anchor" href="#Example_subsystem"></a>2. Example subsystem</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Our example subsystem will keep track of all deployments of certain
types containing a special marker file, and expose operations to see how
long these deployments have been deployed.</p>
</div>
<div class="sect2">
<h3 id="create-the-skeleton-project"><a class="anchor" href="#create-the-skeleton-project"></a>2.1. Create the skeleton project</h3>
<div class="paragraph">
<p>To make your life easier we have provided a maven archetype which will
create a skeleton project for implementing subsystems.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>mvn archetype:generate \
-DarchetypeArtifactId=wildfly-subsystem \
-DarchetypeGroupId=org.wildfly.archetype \
-DarchetypeVersion=26.1.0.Final \
-DarchetypeRepository=https://repository.jboss.org/nexus/content/groups/public</code></pre>
</div>
</div>
<div class="paragraph">
<p>Maven will download the archetype and it’s dependencies, and ask you
some questions:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>$ mvn archetype:generate \
-DarchetypeArtifactId=wildfly-subsystem \
-DarchetypeGroupId=org.wildfly.archetype \
-DarchetypeVersion=26.1.0.Final \
-DarchetypeRepository=https://repository.jboss.org/nexus/content/groups/public
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] ------------------------------------------------------------------------
[INFO]
.........
Define value for property 'module': com.acme.corp.tracker
Define value for property 'groupId': com.acme.corp
Define value for property 'artifactId': acme-subsystem
Define value for property 'version': 1.0-SNAPSHOT: :
Define value for property 'package': com.acme.corp: : com.acme.corp.tracker
[INFO] Using property: name = WildFly subsystem project
Confirm properties configuration:
groupId: com.acme.corp
artifactId: acme-subsystem
version: 1.0-SNAPSHOT
package: com.acme.corp.tracker
module: com.acme.corp.tracker
name: WildFly subsystem project
Y: : Y
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1:42.563s
[INFO] Finished at: Fri Jul 08 14:30:09 BST 2011
[INFO] Final Memory: 7M/81M
[INFO] ------------------------------------------------------------------------
$</code></pre>
</div>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top"></th>
<th class="tableblock halign-left valign-top">Instruction</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">1</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Enter the module name you wish to use for your extension.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">2</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Enter the groupId you wish to use</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">3</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Enter the artifactId you wish to use</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">4</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Enter the version you wish to use, or just hit Enter if you wish to
accept the default 1.0-SNAPSHOT</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">5</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Enter the java package you wish to use, or just hit Enter if you
wish to accept the default (which is copied from groupId ).</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock">6</p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">Finally, if you are happy with your choices, hit Enter and Maven
will generate the project for you.</p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>We now have a skeleton project that you can use to
implement a subsystem. Import the <code>acme-subsystem</code> project into your
favourite IDE. A nice side-effect of running this in the IDE is that you
can see the javadoc of WildFly classes and interfaces imported by the
skeleton code. If you do a <code>mvn install</code> in the project it will work if
we plug it into WildFly, but before doing that we will change it to do
something more useful.</p>
</div>
<div class="paragraph">
<p>The rest of this section modifies the skeleton project created by the
archetype to do something more useful, and the full code can be found in
<a href="downloads/acme-subsystem.zip">acme-subsystem.zip</a>.</p>
</div>
<div class="paragraph">
<p>If you do a <code>mvn install</code> in the created project, you will see some
tests being run</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>$mvn install
[INFO] Scanning for projects...
[...]
[INFO] Surefire report directory: /Users/kabir/sourcecontrol/temp/archetype-test/acme-subsystem/target/surefire-reports
-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running com.acme.corp.tracker.extension.SubsystemBaseParsingTestCase
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.424 sec
Running com.acme.corp.tracker.extension.SubsystemParsingTestCase
Tests run: 6, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.074 sec
Results :
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0
[...]</code></pre>
</div>
</div>
<div class="paragraph">
<p>We will talk about these later in the
<a href="#testing-the-parsers">#Testing the
parsers</a> section.</p>
</div>
</div>
<div class="sect2">
<h3 id="create-the-schema"><a class="anchor" href="#create-the-schema"></a>2.2. Create the schema</h3>
<div class="paragraph">
<p>First, let us define the schema for our subsystem. Rename
<code>src/main/resources/schema/mysubsystem.xsd</code> to
<code>src/main/resources/schema/acme.xsd</code>. Then open <code>acme.xsd</code> and modify it
to the following</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code data-lang="xml"><span class="tag"><xs:schema</span> <span class="attribute-name">xmlns:xs</span>=<span class="string"><span class="delimiter">"</span><span class="content">http://www.w3.org/2001/XMLSchema</span><span class="delimiter">"</span></span>
<span class="attribute-name">targetNamespace</span>=<span class="string"><span class="delimiter">"</span><span class="content">urn:com.acme.corp.tracker:1.0</span><span class="delimiter">"</span></span>
<span class="attribute-name">xmlns</span>=<span class="string"><span class="delimiter">"</span><span class="content">urn:com.acme.corp.tracker:1.0</span><span class="delimiter">"</span></span>
<span class="attribute-name">elementFormDefault</span>=<span class="string"><span class="delimiter">"</span><span class="content">qualified</span><span class="delimiter">"</span></span>
<span class="attribute-name">attributeFormDefault</span>=<span class="string"><span class="delimiter">"</span><span class="content">unqualified</span><span class="delimiter">"</span></span>
<span class="attribute-name">version</span>=<span class="string"><span class="delimiter">"</span><span class="content">1.0</span><span class="delimiter">"</span></span><span class="tag">></span>
<span class="comment"><!-- The subsystem root element --></span>
<span class="tag"><xs:element</span> <span class="attribute-name">name</span>=<span class="string"><span class="delimiter">"</span><span class="content">subsystem</span><span class="delimiter">"</span></span> <span class="attribute-name">type</span>=<span class="string"><span class="delimiter">"</span><span class="content">subsystemType</span><span class="delimiter">"</span></span><span class="tag">/></span>
<span class="tag"><xs:complexType</span> <span class="attribute-name">name</span>=<span class="string"><span class="delimiter">"</span><span class="content">subsystemType</span><span class="delimiter">"</span></span><span class="tag">></span>
<span class="tag"><xs:all></span>
<span class="tag"><xs:element</span> <span class="attribute-name">name</span>=<span class="string"><span class="delimiter">"</span><span class="content">deployment-types</span><span class="delimiter">"</span></span> <span class="attribute-name">type</span>=<span class="string"><span class="delimiter">"</span><span class="content">deployment-typesType</span><span class="delimiter">"</span></span><span class="tag">/></span>
<span class="tag"></xs:all></span>
<span class="tag"></xs:complexType></span>
<span class="tag"><xs:complexType</span> <span class="attribute-name">name</span>=<span class="string"><span class="delimiter">"</span><span class="content">deployment-typesType</span><span class="delimiter">"</span></span><span class="tag">></span>
<span class="tag"><xs:choice</span> <span class="attribute-name">minOccurs</span>=<span class="string"><span class="delimiter">"</span><span class="content">0</span><span class="delimiter">"</span></span> <span class="attribute-name">maxOccurs</span>=<span class="string"><span class="delimiter">"</span><span class="content">unbounded</span><span class="delimiter">"</span></span><span class="tag">></span>
<span class="tag"><xs:element</span> <span class="attribute-name">name</span>=<span class="string"><span class="delimiter">"</span><span class="content">deployment-type</span><span class="delimiter">"</span></span> <span class="attribute-name">type</span>=<span class="string"><span class="delimiter">"</span><span class="content">deployment-typeType</span><span class="delimiter">"</span></span><span class="tag">/></span>
<span class="tag"></xs:choice></span>
<span class="tag"></xs:complexType></span>
<span class="tag"><xs:complexType</span> <span class="attribute-name">name</span>=<span class="string"><span class="delimiter">"</span><span class="content">deployment-typeType</span><span class="delimiter">"</span></span><span class="tag">></span>
<span class="tag"><xs:attribute</span> <span class="attribute-name">name</span>=<span class="string"><span class="delimiter">"</span><span class="content">suffix</span><span class="delimiter">"</span></span> <span class="attribute-name">use</span>=<span class="string"><span class="delimiter">"</span><span class="content">required</span><span class="delimiter">"</span></span><span class="tag">/></span>
<span class="tag"><xs:attribute</span> <span class="attribute-name">name</span>=<span class="string"><span class="delimiter">"</span><span class="content">tick</span><span class="delimiter">"</span></span> <span class="attribute-name">type</span>=<span class="string"><span class="delimiter">"</span><span class="content">xs:long</span><span class="delimiter">"</span></span> <span class="attribute-name">use</span>=<span class="string"><span class="delimiter">"</span><span class="content">optional</span><span class="delimiter">"</span></span> <span class="attribute-name">default</span>=<span class="string"><span class="delimiter">"</span><span class="content">10000</span><span class="delimiter">"</span></span><span class="tag">/></span>
<span class="tag"></xs:complexType></span>
<span class="tag"></xs:schema></span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Note that we modified the <code>xmlns</code> and <code>targetNamespace</code> values to
<code>urn.com.acme.corp.tracker:1.0</code>. Our new <code>subsystem</code> element has a child
called <code>deployment-types</code>, which in turn can have zero or more children
called <code>deployment-type</code>. Each <code>deployment-type</code> has a required <code>suffix</code>
attribute, and a <code>tick</code> attribute which defaults to <code>true.</code></p>
</div>
<div class="paragraph">
<p>Now modify the <code>com.acme.corp.tracker.extension.SubsystemExtension</code>
class to contain the new namespace.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code data-lang="java"><span class="directive">public</span> <span class="type">class</span> <span class="class">SubsystemExtension</span> <span class="directive">implements</span> Extension {
<span class="error"> </span>
<span class="comment">/** The name space used for the {@code substystem} element */</span>
<span class="directive">public</span> <span class="directive">static</span> <span class="directive">final</span> <span class="predefined-type">String</span> NAMESPACE = <span class="string"><span class="delimiter">"</span><span class="content">urn:com.acme.corp.tracker:1.0</span><span class="delimiter">"</span></span>;
...</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="design-and-define-the-model-structure"><a class="anchor" href="#design-and-define-the-model-structure"></a>2.3. Design and define the model structure</h3>
<div class="paragraph">
<p>The following example xml contains a valid subsystem configuration, we
will see how to plug this in to WildFly later in this tutorial.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code data-lang="xml"><span class="tag"><subsystem</span> <span class="attribute-name">xmlns</span>=<span class="string"><span class="delimiter">"</span><span class="content">urn:com.acme.corp.tracker:1.0</span><span class="delimiter">"</span></span><span class="tag">></span>
<span class="tag"><deployment-types></span>
<span class="tag"><deployment-type</span> <span class="attribute-name">suffix</span>=<span class="string"><span class="delimiter">"</span><span class="content">sar</span><span class="delimiter">"</span></span> <span class="attribute-name">tick</span>=<span class="string"><span class="delimiter">"</span><span class="content">10000</span><span class="delimiter">"</span></span><span class="tag">/></span>
<span class="tag"><deployment-type</span> <span class="attribute-name">suffix</span>=<span class="string"><span class="delimiter">"</span><span class="content">war</span><span class="delimiter">"</span></span> <span class="attribute-name">tick</span>=<span class="string"><span class="delimiter">"</span><span class="content">10000</span><span class="delimiter">"</span></span><span class="tag">/></span>
<span class="tag"></deployment-types></span>
<span class="tag"></subsystem></span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Now when designing our model, we can either do a one to one mapping
between the schema and the model or come up with something slightly or
very different. To keep things simple, let us stay pretty true to the
schema so that when executing a <code>:read-resource(recursive=true)</code> against
our subsystem we’ll see something like:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code>{
"outcome" => "success",
"result" => {"type" => {
"sar" => {"tick" => "10000"},
"war" => {"tick" => "10000"}
}}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>Each <code>deployment-type</code> in the xml becomes in the model a child resource
of the subsystem’s root resource. The child resource’s child-type is
<code>type</code>, and it is indexed by its <code>suffix</code>. Each <code>type</code> resource then
contains the <code>tick</code> attribute.</p>
</div>
<div class="paragraph">
<p>We also need a name for our subsystem, to do that change
<code>com.acme.corp.tracker.extension.SubsystemExtension</code>:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code data-lang="java"><span class="directive">public</span> <span class="type">class</span> <span class="class">SubsystemExtension</span> <span class="directive">implements</span> Extension {
...
<span class="comment">/** The name of our subsystem within the model. */</span>
public <span class="directive">static</span> <span class="directive">final</span> <span class="predefined-type">String</span> SUBSYSTEM_NAME = <span class="string"><span class="delimiter">"</span><span class="content">tracker</span><span class="delimiter">"</span></span>;
...</code></pre>
</div>
</div>
<div class="paragraph">
<p>Modify the <code>src/main/resources/com/acme/corp/tracker/LocalDescriptions.properties</code>
with the new extension name, too</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code data-lang="properties">tracker=My Tracker subsystem
tracker.add=Operation Adds subsystem
tracker.remove=Operation Removes subsystem
tracker.type=The type of file
tracker.type.add=Operation Adds type child
tracker.type.remove=Operation Removes type child
tracker.type.tick=The tick time in millis</code></pre>
</div>
</div>
<div class="paragraph">
<p>Once we are finished our subsystem will be available under
<code>/subsystem=tracker</code>.</p>
</div>
<div class="paragraph">
<p>The <code>SubsystemExtension.initialize()</code> method defines the model,
currently it sets up the basics to add our subsystem to the model:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code data-lang="java"><span class="annotation">@Override</span>
<span class="directive">public</span> <span class="type">void</span> initialize(ExtensionContext context) {
<span class="comment">//register subsystem with its model version</span>
<span class="error"> </span> <span class="directive">final</span> SubsystemRegistration subsystem = context.registerSubsystem(SUBSYSTEM_NAME, ModelVersion.create(<span class="integer">1</span>, <span class="integer">0</span>));
<span class="comment">//register subsystem model with subsystem definition that defines all attributes and operations</span>
<span class="error"> </span><span class="error"> </span><span class="error"> </span><span class="error"> </span><span class="error"> </span><span class="error"> </span><span class="error"> </span> <span class="directive">final</span> ManagementResourceRegistration registration = subsystem.registerSubsystemModel(SubsystemDefinition.INSTANCE);
<span class="comment">//register describe operation, note that this can be also registered in SubsystemDefinition</span>
registration.registerOperationHandler(GenericSubsystemDescribeHandler.DEFINITION, GenericSubsystemDescribeHandler.INSTANCE);
<span class="error"> </span> <span class="comment">//we can register additional submodels here</span>
<span class="comment">//</span>
subsystem.registerXMLElementWriter(parser);
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>registerSubsystem()</code> call registers our subsystem with the
extension context. At the end of the method we register our parser with
the returned <code>SubsystemRegistration</code> to be able to marshal our
subsystem’s model back to the main configuration file when it is
modified. We will add more functionality to this method later.</p>
</div>
<div class="sect3">
<h4 id="registering-the-core-subsystem-model"><a class="anchor" href="#registering-the-core-subsystem-model"></a>2.3.1. Registering the core subsystem model</h4>
<div class="paragraph">
<p>Next we obtain a <code>ManagementResourceRegistration</code> by registering the
subsystem model. This is a <strong>compulsory</strong> step for every new subsystem.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code data-lang="java"><span class="directive">final</span> ManagementResourceRegistration registration = subsystem.registerSubsystemModel(SubsystemDefinition.INSTANCE);</code></pre>
</div>
</div>
<div class="paragraph">
<p>Its parameter is an implementation of the <code>ResourceDefinition</code>
interface, which means that when you call
<code>/subsystem=tracker:read-resource-description</code> the information you see
comes from model that is defined by <code>SubsystemDefinition.INSTANCE</code>.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight nowrap"><code data-lang="java"><span class="directive">public</span> <span class="type">class</span> <span class="class">SubsystemDefinition</span> <span class="directive">extends</span> PersistentResourceDefinition {
<span class="directive">static</span> <span class="directive">final</span> AttributeDefinition<span class="type">[]</span> ATTRIBUTES = { <span class="comment">/* you can include attributes here */</span> };
<span class="directive">static</span> <span class="directive">final</span> SubsystemDefinition INSTANCE = <span class="keyword">new</span> SubsystemDefinition();
<span class="directive">private</span> SubsystemDefinition() {
<span class="local-variable">super</span>(SubsystemExtension.SUBSYSTEM_PATH,
SubsystemExtension.getResourceDescriptionResolver(<span class="predefined-constant">null</span>),
<span class="comment">//We always need to add an 'add' operation</span>
SubsystemAdd.INSTANCE,
<span class="comment">//Every resource that is added, normally needs a remove operation</span>
SubsystemRemove.INSTANCE);
}
<span class="annotation">@Override</span>
<span class="directive">public</span> <span class="type">void</span> registerOperations(ManagementResourceRegistration resourceRegistration) {
<span class="local-variable">super</span>.registerOperations(resourceRegistration);
<span class="comment">//you can register additional operations here</span>