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| <h1 id="introspection-and-architecture">Introspection and Architecture<a class="headerlink" href="#introspection-and-architecture" title="Permanent link">¶</a></h1> |
| <p><em>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... Moreover; iPOJO defines an 'arch' command displaying this architecture in Felix. You need to install <a href="/documentation/subprojects/apache-felix-ipojo/apache-felix-ipojo-tools/ipojo-arch-command.html">the arch command</a>.</em></p> |
| <div class="toc"> |
| <ul> |
| <li><a href="#introspection-and-architecture">Introspection and Architecture</a><ul> |
| <li><a href="#reflection-on-component-instances">Reflection on component instances</a></li> |
| <li><a href="#metadata">Metadata</a></li> |
| <li><a href="#the-arch-command">The "arch" command</a></li> |
| <li><a href="#technical-information">Technical information</a></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <h2 id="reflection-on-component-instances">Reflection on component instances<a class="headerlink" href="#reflection-on-component-instances" title="Permanent link">¶</a></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 id="metadata">Metadata<a class="headerlink" href="#metadata" title="Permanent link">¶</a></h2> |
| <p>The architecture (i.e. instance introspection) is activated by default. To disable it, you need to add an attribute <code>architecture="false"</code> to the component element:</p> |
| <div class="codehilite"><pre><span class="nt"><component</span> <span class="na">classname=</span><span class="s">"org.apache.felix.ipojo.hello.impl.HelloServiceImpl"</span> <span class="na">architecture=</span><span class="s">"false"</span><span class="nt">></span> |
| </pre></div> |
| |
| |
| <p>By default, the architecture feature is enabled.</p> |
| <h2 id="the-arch-command">The "arch" command<a class="headerlink" href="#the-arch-command" title="Permanent link">¶</a></h2> |
| <p>The Gogo commands are the following:</p> |
| <ul> |
| <li><code>ipojo:instances</code> (or just <code>instances</code>) lists the instances and state</li> |
| <li><code>ipojo:instance $instance_name</code> (or just <code>instance $instance_name</code>) displays the complete information about the specified $instance_name</li> |
| <li><code>ipojo:factories</code> (or just <code>factories</code>) lists the available public factories</li> |
| <li><code>ipojo:factory $factory_name</code> (or just <code>factory $factory_name</code>) displays complete information about the factory $factory_name</li> |
| <li><code>ipojo:handlers</code> (or just <code>handlers</code> lists available handlers</li> |
| </ul> |
| <p>For example:</p> |
| <div class="codehilite"><pre><span class="nv">$ </span>instances |
| Instance ArchCommand -> valid |
| Instance spell.english.EnglishDictionary-0 -> valid |
| Instance spell.checker.SpellCheck-0 -> valid |
| Instance spell.gui.SpellCheckerGui-0 -> valid |
| |
| <span class="nv">$ </span>instance spell.checker.SpellCheck-0 |
| instance component.type<span class="o">=</span><span class="s2">"spell.checker.SpellCheck"</span> <span class="nv">state</span><span class="o">=</span><span class="s2">"valid"</span> <span class="nv">bundle</span><span class="o">=</span><span class="s2">"8"</span> <span class="nv">name</span><span class="o">=</span><span class="s2">"spell.checker.SpellCheck-0"</span> |
| handler <span class="nv">state</span><span class="o">=</span><span class="s2">"valid"</span> <span class="nv">name</span><span class="o">=</span><span class="s2">"org.apache.felix.ipojo.handlers.dependency.DependencyHandler"</span> |
| requires <span class="nv">optional</span><span class="o">=</span><span class="s2">"false"</span> <span class="nv">aggregate</span><span class="o">=</span><span class="s2">"false"</span> <span class="nv">state</span><span class="o">=</span><span class="s2">"resolved"</span> binding-policy<span class="o">=</span><span class="s2">"dynamic"</span> <span class="nv">specification</span><span class="o">=</span><span class="s2">"spell.services.DictionaryService"</span> |
| handler <span class="nv">state</span><span class="o">=</span><span class="s2">"valid"</span> <span class="nv">name</span><span class="o">=</span><span class="s2">"org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandler"</span> |
| provides service.id<span class="o">=</span><span class="s2">"36"</span> <span class="nv">state</span><span class="o">=</span><span class="s2">"registered"</span> <span class="nv">specifications</span><span class="o">=</span><span class="s2">"[spell.services.SpellChecker]"</span> |
| property <span class="nv">value</span><span class="o">=</span><span class="s2">"spell.checker.SpellCheck"</span> <span class="nv">name</span><span class="o">=</span><span class="s2">"factory.name"</span> |
| property <span class="nv">value</span><span class="o">=</span><span class="s2">"spell.checker.SpellCheck-0"</span> <span class="nv">name</span><span class="o">=</span><span class="s2">"instance.name"</span> |
| handler <span class="nv">state</span><span class="o">=</span><span class="s2">"valid"</span> <span class="nv">name</span><span class="o">=</span><span class="s2">"org.apache.felix.ipojo.handlers.architecture.ArchitectureHandler"</span> |
| </pre></div> |
| |
| |
| <p>More info on the <code>arch</code> command are available <a href="/documentation/subprojects/apache-felix-ipojo/apache-felix-ipojo-tools/ipojo-arch-command.html">here</a>.</p> |
| <h2 id="technical-information">Technical information<a class="headerlink" href="#technical-information" title="Permanent link">¶</a></h2> |
| <p>In fact, when a component enables the architecture introspection, its container exposes an <code>Architecture</code> 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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| Rev. 1700393 by cziegeler on Tue, 1 Sep 2015 06:04:06 +0000 |
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