ipojo/core/doc/architecture-handler.html - onos-felix - Gitiles

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 <h1><a name="ArchitectureHandler-IntrospectionandArchitecture"></a>Introspection and Architecture</h1>

 <p>The architecture feature allows obtaining an architectural /
 component view of your systems. It exposes a snapshot of the present
 instances &amp; factories, the state of these instances ...<br>
 Moreover; iPOJO defines an 'arch' command displaying this architecture
 in Felix. You need to install the arch command bundle available in the
 Felix trunk.</p>

 <h2><a name="ArchitectureHandler-Reflectiononthecomponent"></a>Reflection on the component</h2>

 <p>The architecture feature does "reflection" on the iPOJO containers.
 It gathers information about the component (state, class name ...),
 requirement (state, multiple, optional ...), provided services (state,
 properties) ... Each handler can participate to the architecture. This
 information allows you to know why an instance does not start, or why
 the component does not publish / provide a service.</p>

 <h2><a name="ArchitectureHandler-Metadata"></a>Metadata</h2>

 <p>The architecture (i.e. instance introspection) is activated by default. To disable it, you need to add an attribute <em>"architecture=false"</em> to the component element:</p>
 <div class="code"><div class="codeContent">
 <pre class="code-xml"><span class="code-tag">&lt;component classname=<span class="code-quote">"fr.imag.adele.escoffier.hello.impl.HelloServiceImpl"</span> architecture=<span class="code-quote">"false"</span>&gt;</span></pre>
 </div></div>
 <p>By default, the architecture feature is enabled.</p>

 <h2><a name="ArchitectureHandler-The&quot;arch&quot;command"></a>The "arch" command</h2>

 <p>A Felix command comes with the architecture handler. This command
 looks for all component exposing the architecture and print the
 information.</p>
 <div class="code"><div class="codeContent">
 <pre class="code-java">arch =&gt; displays instances name &amp; state (equivalent to arch \-instances)
 arch -instance $instance_name =&gt; displays complete information about the instance $instance_name
 arch -factories =&gt; display the list of available factories
 arch -factory $factory_name =&gt; display complete information about the factory $factory_name
 arch -handlers =&gt; list available handlers</pre>
 </div></div>

 <p>More info on the <tt>arch</tt> command are available <a href="http://felix.apache.org/site/ipojo-arch-command.html" title="iPOJO-Arch-Command">here</a>.</p>

 <h2><a name="ArchitectureHandler-Technicalinformation"></a>Technical information</h2>

 <p>In fact, when a component enables the architecture introspection,
 its container exposes an Architecture service. Any architecture
 requester can obtain information about the instance. For example, the
 arch command requests all the architecture services and prints the
 information.</p>
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 <h6><a name="ArchitectureHandler-Overview"></a><b>Overview</b></h6>
 <ul>
 	<li><a href="http://felix.apache.org/site/apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</a></li>
 	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-feature-overview.html" title="Apache Felix iPOJO Feature Overview">iPOJO Feature Overview</a></li>
 	<li><a href="http://felix.apache.org/site/download.html" title="Download">Download &amp; Install </a></li>
 </ul>


 <h6><a name="ArchitectureHandler-GettingStarted"></a><b>Getting Started</b></h6>
 <ul>
 	<li><a href="http://felix.apache.org/site/ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</a></li>
 	<li><a href="http://felix.apache.org/site/how-to-use-ipojo-annotations.html" title="How to use iPOJO Annotations">How to use iPOJO Annotations</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-hello-word-maven-based-tutorial.html" title="iPOJO Hello Word (Maven-Based) tutorial">iPOJO Hello Word (Maven-Based) tutorial</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-composition-tutorial.html" title="iPOJO Composition Tutorial">iPOJO Composition Tutorial</a></li>
 </ul>


 <h6><a name="ArchitectureHandler-UserGuide"></a><b>User Guide</b></h6>
 <ul>
 	<li><a href="http://felix.apache.org/site/describing-components.html" title="Describing components">Describing components (handler list) </a></li>
 	<li><a href="http://felix.apache.org/site/using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</a></li>
 	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-testing-components.html" title="apache-felix-ipojo-testing-components">Testing components</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-faq.html" title="iPOJO FAQ">FAQ</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-reference-card.html" title="iPOJO-Reference-Card">iPOJO Reference Card</a></li>
 </ul>


 <h6><a name="ArchitectureHandler-Tools"></a><b>Tools</b></h6>
 <ul>
 	<li><a href="http://felix.apache.org/site/ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug-in</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug-in</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-arch-command.html" title="iPOJO-Arch-Command">iPOJO Arch Command</a></li>
 	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-junit4osgi.html" title="apache-felix-ipojo-junit4osgi">Junit4OSGi</a></li>
 	<li><a href="http://felix.apache.org/site/ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</a></li>
 </ul>


 <h6><a name="ArchitectureHandler-DeveloperGuide"></a><b>Developer Guide</b></h6>
 <ul>
 	<li>API: <span class="nobr"><a href="http://people.apache.org/%7Eclement/ipojo/api/1.0/" title="Visit page outside Confluence" rel="nofollow">1.0<sup><img class="rendericon" src="architecture-handler_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
 	<li><a href="http://felix.apache.org/site/how-to-write-your-own-handler.html" title="How to write your own handler">How to write your own handler</a></li>
 	<li><a href="http://felix.apache.org/site/how-to-use-ipojo-manipulation-metadata.html" title="How to use iPOJO Manipulation Metadata">How to use iPOJO Manipulation Metadata</a></li>
 	<li><a href="http://felix.apache.org/site/dive-into-the-ipojo-manipulation-depths.html" title="Dive into the iPOJO Manipulation depths">Dive into the iPOJO Manipulation depths</a></li>
 </ul>


 <h6><a name="ArchitectureHandler-Misc&amp;Contact"></a><b>Misc &amp; Contact</b></h6>
 <ul>
 	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</a></li>
 	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</a></li>
 	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</a></li>
 	<li><span class="nobr"><a href="http://ipojo-dark-side.blogspot.com/" title="Visit page outside Confluence" rel="nofollow">iPOJO's Dark Side Blog<sup><img class="rendericon" src="architecture-handler_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
 	<li><a href="http://felix.apache.org/site/future-ideas.html" title="Future Ideas">Future Ideas</a></li>
 	<li><a href="http://felix.apache.org/site/contact.html" title="Contact">Contact</a></li>
 	<li><a href="http://felix.apache.org/site/related-works.html" title="Related Works">Related Works</a></li>
 	<li><a href="http://felix.apache.org/site/article-presentations.html" title="Article &amp; Presentations">Article &amp; Presentations</a></li>
 </ul>


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	<title>Apache Felix - Architecture Handler</title>
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	<td class="confluenceTd" valign="top" width="80%">
	<h1><a name="ArchitectureHandler-IntrospectionandArchitecture"></a>Introspection and Architecture</h1>

	<p>The architecture feature allows obtaining an architectural /
	component view of your systems. It exposes a snapshot of the present
	instances & factories, the state of these instances ...<br>
	Moreover; iPOJO defines an 'arch' command displaying this architecture
	in Felix. You need to install the arch command bundle available in the
	Felix trunk.</p>

	<h2><a name="ArchitectureHandler-Reflectiononthecomponent"></a>Reflection on the component</h2>

	<p>The architecture feature does "reflection" on the iPOJO containers.
	It gathers information about the component (state, class name ...),
	requirement (state, multiple, optional ...), provided services (state,
	properties) ... Each handler can participate to the architecture. This
	information allows you to know why an instance does not start, or why
	the component does not publish / provide a service.</p>

	<h2><a name="ArchitectureHandler-Metadata"></a>Metadata</h2>

	<p>The architecture (i.e. instance introspection) is activated by default. To disable it, you need to add an attribute <em>"architecture=false"</em> to the component element:</p>
	<div class="code"><div class="codeContent">
	<pre class="code-xml"><span class="code-tag"><component classname=<span class="code-quote">"fr.imag.adele.escoffier.hello.impl.HelloServiceImpl"</span> architecture=<span class="code-quote">"false"</span>></span></pre>
	</div></div>
	<p>By default, the architecture feature is enabled.</p>

	<h2><a name="ArchitectureHandler-The"arch"command"></a>The "arch" command</h2>

	<p>A Felix command comes with the architecture handler. This command
	looks for all component exposing the architecture and print the
	information.</p>
	<div class="code"><div class="codeContent">
	<pre class="code-java">arch => displays instances name & state (equivalent to arch \-instances)
	arch -instance $instance_name => displays complete information about the instance $instance_name
	arch -factories => display the list of available factories
	arch -factory $factory_name => display complete information about the factory $factory_name
	arch -handlers => list available handlers</pre>
	</div></div>

	<p>More info on the <tt>arch</tt> command are available <a href="http://felix.apache.org/site/ipojo-arch-command.html" title="iPOJO-Arch-Command">here</a>.</p>

	<h2><a name="ArchitectureHandler-Technicalinformation"></a>Technical information</h2>

	<p>In fact, when a component enables the architecture introspection,
	its container exposes an Architecture service. Any architecture
	requester can obtain information about the instance. For example, the
	arch command requests all the architecture services and prints the
	information.</p>
	</td>
	<td class="confluenceTd" valign="top" width="20%">
	<h6><a name="ArchitectureHandler-Overview"></a><b>Overview</b></h6>
	<ul>
	<li><a href="http://felix.apache.org/site/apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</a></li>
	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-feature-overview.html" title="Apache Felix iPOJO Feature Overview">iPOJO Feature Overview</a></li>
	<li><a href="http://felix.apache.org/site/download.html" title="Download">Download & Install </a></li>
	</ul>


	<h6><a name="ArchitectureHandler-GettingStarted"></a><b>Getting Started</b></h6>
	<ul>
	<li><a href="http://felix.apache.org/site/ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</a></li>
	<li><a href="http://felix.apache.org/site/how-to-use-ipojo-annotations.html" title="How to use iPOJO Annotations">How to use iPOJO Annotations</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-hello-word-maven-based-tutorial.html" title="iPOJO Hello Word (Maven-Based) tutorial">iPOJO Hello Word (Maven-Based) tutorial</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-composition-tutorial.html" title="iPOJO Composition Tutorial">iPOJO Composition Tutorial</a></li>
	</ul>


	<h6><a name="ArchitectureHandler-UserGuide"></a><b>User Guide</b></h6>
	<ul>
	<li><a href="http://felix.apache.org/site/describing-components.html" title="Describing components">Describing components (handler list) </a></li>
	<li><a href="http://felix.apache.org/site/using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</a></li>
	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-testing-components.html" title="apache-felix-ipojo-testing-components">Testing components</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-faq.html" title="iPOJO FAQ">FAQ</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-reference-card.html" title="iPOJO-Reference-Card">iPOJO Reference Card</a></li>
	</ul>


	<h6><a name="ArchitectureHandler-Tools"></a><b>Tools</b></h6>
	<ul>
	<li><a href="http://felix.apache.org/site/ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug-in</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug-in</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-arch-command.html" title="iPOJO-Arch-Command">iPOJO Arch Command</a></li>
	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-junit4osgi.html" title="apache-felix-ipojo-junit4osgi">Junit4OSGi</a></li>
	<li><a href="http://felix.apache.org/site/ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</a></li>
	</ul>


	<h6><a name="ArchitectureHandler-DeveloperGuide"></a><b>Developer Guide</b></h6>
	<ul>
	<li>API: <span class="nobr"><a href="http://people.apache.org/%7Eclement/ipojo/api/1.0/" title="Visit page outside Confluence" rel="nofollow">1.0<sup><img class="rendericon" src="architecture-handler_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
	<li><a href="http://felix.apache.org/site/how-to-write-your-own-handler.html" title="How to write your own handler">How to write your own handler</a></li>
	<li><a href="http://felix.apache.org/site/how-to-use-ipojo-manipulation-metadata.html" title="How to use iPOJO Manipulation Metadata">How to use iPOJO Manipulation Metadata</a></li>
	<li><a href="http://felix.apache.org/site/dive-into-the-ipojo-manipulation-depths.html" title="Dive into the iPOJO Manipulation depths">Dive into the iPOJO Manipulation depths</a></li>
	</ul>


	<h6><a name="ArchitectureHandler-Misc&Contact"></a><b>Misc & Contact</b></h6>
	<ul>
	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</a></li>
	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</a></li>
	<li><a href="http://felix.apache.org/site/apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</a></li>
	<li><span class="nobr"><a href="http://ipojo-dark-side.blogspot.com/" title="Visit page outside Confluence" rel="nofollow">iPOJO's Dark Side Blog<sup><img class="rendericon" src="architecture-handler_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
	<li><a href="http://felix.apache.org/site/future-ideas.html" title="Future Ideas">Future Ideas</a></li>
	<li><a href="http://felix.apache.org/site/contact.html" title="Contact">Contact</a></li>
	<li><a href="http://felix.apache.org/site/related-works.html" title="Related Works">Related Works</a></li>
	<li><a href="http://felix.apache.org/site/article-presentations.html" title="Article & Presentations">Article & Presentations</a></li>
	</ul>


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