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Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]5
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]6 <title>Apache Felix - Controller Lifecycle Handler</title>
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30<p>The controller lifecycle handler allows a component implementation
31to participate to the instance lifecycle. This handler allows you
32checking instances configuration (file existence for instance).</p>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]33
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]34<h2><a name="ControllerLifecycleHandler-iPOJOInstanceLifecycle&amp;Lifecyclecontroller"></a>iPOJO Instance Lifecycle &amp; Lifecycle controller</h2>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]35
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]36<p>Once started, iPOJO instances can be either valid or invalid. The
37decision comes from handlers. An instance is valid if every plugged
38handler are valid. As soos as one handler becomes invalid, the instance
39becomes invalid.</p>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]40
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]41<p>The lifecycle controller just monitors a field inside the POJO
42class. When this field becomes 'false', the handler becomes invalid.
43When the field get the 'true' value, the handler becomes valid.</p>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]44
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]45<h2><a name="ControllerLifecycleHandler-Anexemple"></a>An exemple</h2>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]46
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]47<p>Imagine the following component :</p>
48<div class="code"><div class="codeContent">
49<pre class="code-java"><span class="code-keyword">public</span> class LifecycleControllerTest {
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]50
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]51 <span class="code-keyword">private</span> <span class="code-object">boolean</span> m_state;
52 <span class="code-keyword">private</span> <span class="code-object">String</span> m_conf;
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]53
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]54 <span class="code-keyword">public</span> void setConf(<span class="code-object">String</span> newConf) {
55 <span class="code-object">System</span>.out.println(<span class="code-quote">"setConf : "</span> + newConf);
56 <span class="code-keyword">if</span> (newConf.equals(<span class="code-quote">"foo"</span>)) {
57 m_state = <span class="code-keyword">true</span>;
58 } <span class="code-keyword">else</span> {
59 m_state = <span class="code-keyword">false</span>;
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]60 }
61 }
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]62}</pre>
63</div></div>
64<p>with the following metadata :</p>
65<div class="code"><div class="codeContent">
66<pre class="code-xml">&lt;component
67 classname=<span class="code-quote">"org.apache.felix.ipojo.test.scenarios.component.LifecycleControllerTest"</span>
68 name=<span class="code-quote">"lcTest"</span> immediate=<span class="code-quote">"true"</span> architecture=<span class="code-quote">"true"</span>&gt;
69 <span class="code-tag">&lt;controller field=<span class="code-quote">"m_state"</span>/&gt;</span>
70 <span class="code-tag">&lt;properties&gt;</span>
71 <span class="code-tag">&lt;property name=<span class="code-quote">"conf"</span> field=<span class="code-quote">"m_conf"</span> method=<span class="code-quote">"setConf"</span>/&gt;</span>
72 <span class="code-tag">&lt;/properties&gt;</span>
73<span class="code-tag">&lt;/component&gt;</span></pre>
74</div></div>
75<p>This component declares the 'm_state' field as a lifecycle controller (&lt;controller/&gt; element)</p>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]76
77
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]78<p>The component requires the 'conf' property. iPOJO checks if this
79property is inside the pushed configuration, but cannot checks if the
80configuration is correct according to the component. When the instance
81is created, the setConf method is called with the pushed value. If the
82given 'conf' property is "foo" the 'm_state' field (i.e. the
83controller) becomes true. Else, the 'm_state' receives the false value.
84It means that the lifecycle controller handler becomes invalid and as a
85consequence, the instance becomes invalid.</p>
86</td>
87<td class="confluenceTd" valign="top" width="20%">
88<h6><a name="ControllerLifecycleHandler-Overview"></a><b>Overview</b></h6>
89<ul>
90 <li><a href="http://felix.apache.org/site/apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</a></li>
91 <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>
92 <li><a href="http://felix.apache.org/site/download.html" title="Download">Download &amp; Install </a></li>
93</ul>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]94
95
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]96<h6><a name="ControllerLifecycleHandler-GettingStarted"></a><b>Getting Started</b></h6>
97<ul>
98 <li><a href="http://felix.apache.org/site/ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</a></li>
99 <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>
100 <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>
101 <li><a href="http://felix.apache.org/site/ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</a></li>
102 <li><a href="http://felix.apache.org/site/ipojo-composition-tutorial.html" title="iPOJO Composition Tutorial">iPOJO Composition Tutorial</a></li>
103</ul>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]104
105
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]106<h6><a name="ControllerLifecycleHandler-UserGuide"></a><b>User Guide</b></h6>
107<ul>
108 <li><a href="http://felix.apache.org/site/describing-components.html" title="Describing components">Describing components (handler list) </a></li>
109 <li><a href="http://felix.apache.org/site/using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</a></li>
110 <li><a href="http://felix.apache.org/site/apache-felix-ipojo-testing-components.html" title="apache-felix-ipojo-testing-components">Testing components</a></li>
111 <li><a href="http://felix.apache.org/site/ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</a></li>
112 <li><a href="http://felix.apache.org/site/ipojo-faq.html" title="iPOJO FAQ">FAQ</a></li>
113</ul>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]114
115
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]116<h6><a name="ControllerLifecycleHandler-Tools"></a><b>Tools</b></h6>
117<ul>
118 <li><a href="http://felix.apache.org/site/ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug-in</a></li>
119 <li><a href="http://felix.apache.org/site/ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</a></li>
120 <li><a href="http://felix.apache.org/site/ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug-in</a></li>
121 <li><a href="http://felix.apache.org/site/apache-felix-ipojo-junit4osgi.html" title="apache-felix-ipojo-junit4osgi">Junit4OSGi</a></li>
122 <li><a href="http://felix.apache.org/site/ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</a></li>
123</ul>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]124
125
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]126<h6><a name="ControllerLifecycleHandler-DeveloperGuide"></a><b>Developer Guide</b></h6>
127<ul>
128 <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="controller-lifecycle-handler_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
129 <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>
130 <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>
131 <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>
132</ul>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]133
134
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]135<h6><a name="ControllerLifecycleHandler-Misc&amp;Contact"></a><b>Misc &amp; Contact</b></h6>
136<ul>
137 <li><a href="http://felix.apache.org/site/apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</a></li>
138 <li><a href="http://felix.apache.org/site/apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</a></li>
139 <li><a href="http://felix.apache.org/site/apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</a></li>
140 <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="controller-lifecycle-handler_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
141 <li><a href="http://felix.apache.org/site/future-ideas.html" title="Future Ideas">Future Ideas</a></li>
142 <li><a href="http://felix.apache.org/site/contact.html" title="Contact">Contact</a></li>
143 <li><a href="http://felix.apache.org/site/related-works.html" title="Related Works">Related Works</a></li>
144 <li><a href="http://felix.apache.org/site/article-presentations.html" title="Article &amp; Presentations">Article &amp; Presentations</a></li>
145</ul>
Clement Escoffier50254022008-05-16 20:33:54 +0000[diff] [blame]146
147
Clement Escoffier3e0db1e2009-01-15 15:35:17 +0000[diff] [blame]148<hr>
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