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gerrit.onosproject.org / onos-felix / 6b928e9664eb417d64fca1fc235f586d4b50d396 / . / ipojo / arch / doc / architecture-handler.html
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38<H1><A name="ArchitectureHandler-IntrospectionandArchitecture"></A>Introspection and Architecture</H1>
39
40<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>
41Moreover; iPOJO defines an 'arch' command displaying this architecture in Felix. You need to install the arch command bundle available in the Felix trunk.</P>
42
43<H2><A name="ArchitectureHandler-Reflectiononthecomponent"></A>Reflection on the component</H2>
44
45<P>The architecture feature does &quot;reflection&quot; 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>
46
47<H2><A name="ArchitectureHandler-Metadata"></A>Metadata</H2>
48
49<P>The architecture (i.e. instance introspection) is activated by default. To disable it, you need to add an attribute <EM>&quot;architecture=false&quot;</EM> to the component element:</P>
50<DIV class="code"><DIV class="codeContent">
51<PRE class="code-xml"><SPAN class="code-tag">&lt;Component className=<SPAN class="code-quote">&quot;fr.imag.adele.escoffier.hello.impl.HelloServiceImpl&quot;</SPAN> architecture=<SPAN class="code-quote">&quot;false&quot;</SPAN>&gt;</SPAN></PRE>
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53<P>By default, the architecture feature is enabled.</P>
54
55<H2><A name="ArchitectureHandler-The%22arch%22command"></A>The &quot;arch&quot; command</H2>
56
57<P>A Felix command comes with the architecture handler. This command looks for all component exposing the architecture and print the information.</P>
58<DIV class="code"><DIV class="codeContent">
59<PRE class="code-java">arch =&gt; displays instances name &amp; state (equivalent to arch \-instances)
60arch -instance $instance_name =&gt; displays complete information about the instance $instance_name
61arch -factories =&gt; display the list of available factories
62arch -factory $factory_name =&gt; display complete information about the factory $factory_name</PRE>
63</DIV></DIV>
64<H2><A name="ArchitectureHandler-Technicalinformation"></A>Technical information</H2>
65
66<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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75<H6><A name="ArchitectureHandler-Overview"></A><B>Overview</B></H6>
76<UL>
77 <LI><A href="http://felix.apache.org/site/apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</A></LI>
78 <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>
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83<H6><A name="ArchitectureHandler-GettingStarted"></A><B>Getting Started</B></H6>
84<UL>
85 <LI><A href="http://felix.apache.org/site/ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</A></LI>
86 <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 &#40;Maven&#45;Based&#41; tutorial</A></LI>
87 <LI><A href="http://felix.apache.org/site/ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</A></LI>
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91<H6><A name="ArchitectureHandler-UserGuide"></A><B>User Guide</B></H6>
92<UL>
93 <LI><A href="http://felix.apache.org/site/describing-components.html" title="Describing components">Describing components</A></LI>
94 <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>
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96 <LI><A href="http://felix.apache.org/site/ipojo-faq.html" title="iPOJO FAQ">FAQ</A></LI>
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100<H6><A name="ArchitectureHandler-Tools"></A><B>Tools</B></H6>
101<UL>
102 <LI><A href="http://felix.apache.org/site/ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug&#45;in</A></LI>
103 <LI><A href="http://felix.apache.org/site/ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</A></LI>
104 <LI><A href="http://felix.apache.org/site/ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug&#45;in</A></LI>
105 <LI><A href="http://felix.apache.org/site/ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</A></LI>
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109<H6><A name="ArchitectureHandler-DeveloperGuide"></A><B>Developer Guide</B></H6>
110<UL>
111 <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>
112 <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>
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