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+<H1><A name="ExtenderPatternHandler-Theextenderpatternhandler"></A>The extender pattern handler</H1>
+<P>The objective of this handler is to simplify the development of extender-based architecture. This architecture-style is based on two different roles:</P>
+<UL>
+	<LI>The extender</LI>
+	<LI>The extension</LI>
+</UL>
+
+
+<P><IMG src="extender-pattern-handler.data/extender.png" align="absmiddle" border="0"><BR>
+The relation is basically a 1..n relation. The extender tracks extensions. The particularity of this architecture-style is that extensions are packaged in different bundles. An extension is detected by analyzing the bundle. Indeed these bundles can have a special mark in their manifest of a special file...<BR>
+Implementing an extender pattern could be complex as the extender needs to track these marks dynamically. When a bundle starts, it needs to look at the mark. Then a bundle leave, the extender must release all object created from this bundle.<BR>
+This handler tracks bundle for you based on the specified required mark. At each time a matching bundle appears or disappears, a callback is invoked. The mark is currently a header in the bundle manifest.<BR>
+Nowadays, a lot of frameworks use this pattern such as iPOJO it-self (to find both bundles containing components and bundles adding a new implementation type), Spring-DM ...</P>
+
+<H2><A name="ExtenderPatternHandler-Usingthehandler"></A>Using the handler</H2>
+<P>First of all, you need to configure the component type to use the handler such as:</P>
+<DIV class="code"><DIV class="codeContent">
+<PRE class="code-xml"><SPAN class="code-tag">&lt;iPOJO <SPAN class="code-keyword">xmlns:extender</SPAN>=<SPAN class="code-quote">&quot;org.apache.felix.ipojo.extender&quot;</SPAN>&gt;</SPAN>
+	&lt;Component
+		className=<SPAN class="code-quote">&quot;org.apache.felix.ipojo.extender.myextender&quot;</SPAN>&gt;
+		
+                <SPAN class="code-tag">&lt;!&mdash;Extender Pattern handler configuration --&gt;</SPAN>
+		&lt;extender:extender 
+                  extension=<SPAN class="code-quote">&quot;My-Extension&quot;</SPAN>
+                  onArrival=<SPAN class="code-quote">&quot;onBundleArrival&quot;</SPAN> 
+                  onDeparture=<SPAN class="code-quote">&quot;onBundleDeparture&quot;</SPAN> 
+                /&gt;
+
+		<SPAN class="code-tag">&lt;callback transition=<SPAN class="code-quote">&quot;invalidate&quot;</SPAN> method=<SPAN class="code-quote">&quot;stopping&quot;</SPAN> /&gt;</SPAN>
+		<SPAN class="code-tag">&lt;callback transition=<SPAN class="code-quote">&quot;validate&quot;</SPAN> method=<SPAN class="code-quote">&quot;starting&quot;</SPAN> /&gt;</SPAN>
+		<SPAN class="code-tag">&lt;provides /&gt;</SPAN>
+	<SPAN class="code-tag">&lt;/Component&gt;</SPAN>
+<SPAN class="code-tag">&lt;/iPOJO&gt;</SPAN></PRE>
+</DIV></DIV>
+<P>Notice that, this handler is an external handler. So, it uses the &quot;org.apache.felix.ipojo.extender&quot; namespace.<BR>
+Once described, you can implement your component. The methods specified methods will be called when a matching bundle arrives or leaves.<BR>
+In the previous example, these methods could be: </P>
+<DIV class="code"><DIV class="codeContent">
+<PRE class="code-java">void onBundleArrival(Bundle bundle, <SPAN class="code-object">String</SPAN> header) {
+<SPAN class="code-comment">// Do something
+</SPAN>}
+
+void onBundleDeparture(Bundle bundle) {
+        <SPAN class="code-comment">// Do something
+</SPAN>}</PRE>
+</DIV></DIV>
+<P>Notice the different signatures of the methods. The arrival method is called with the arriving bundle and the matching header value (i.e. the value of the My-Extension header of the bundle manifest). The departure method just receives the leaving bundle.</P>
+<H2><A name="ExtenderPatternHandler-Configuration"></A>Configuration</H2>
+<P>The handler has only three mandatory attributes:</P>
+<UL>
+	<LI>Extension: declaring the looked manifest header.</LI>
+	<LI>onArrival: declaring the method to invoke when a matching bundle arrives</LI>
+	<LI>onDeparture: declaring the method to invoke when a matching bundle leaves</LI>
+</UL>
+
+
+<TABLE cellpadding="5" width="85%" cellspacing="8px" class="noteMacro" border="0" align="center"><COLGROUP><COL width="24"><COL></COLGROUP><TR><TD valign="top"><IMG src="../../cwiki.apache.org/confluence/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></TD><TD>
+<P>The implementation will be notified of arrivals and departures despite the instance is invalid. Indeed, the implementation must release all objects created from another bundle as soon it leaves.</P></TD></TR></TABLE>
+
+<H2><A name="ExtenderPatternHandler-Download"></A>Download</H2>
+<P>The handler is available on the <A href="download.html" title="Download">download</A> page.<BR>
+Sources are available on the Felix trunk at the following location: <SPAN class="nobr"><A href="http://svn.apache.org/repos/asf/felix/trunk/ipojo/handler/extender/" title="Visit page outside Confluence" rel="nofollow">http://svn.apache.org/repos/asf/felix/trunk/ipojo/handler/extender/<SUP><IMG class="rendericon" src="../../cwiki.apache.org/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"></SUP></A></SPAN></P>
+
+<H2><A name="ExtenderPatternHandler-Amorerealisticexample"></A>A more realistic example</H2>
+<P>The Junit4OSGi framework, available <SPAN class="nobr"><A href="https://svn.apache.org/repos/asf/felix/trunk/ipojo/examples/junit4osgi" title="Visit page outside Confluence" rel="nofollow">here<SUP><IMG class="rendericon" src="../../cwiki.apache.org/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"></SUP></A></SPAN> , uses this handler to track Junit Test Suite offered by the installed bundles. The Junit4Osgi bundle has a component using this handler to be notified when a bundle with the &quot;Test-Suite&quot; header appears or leaves.</P>
+</TD>
+<TD class="confluenceTd" valign="top" width="20%">
+<H6><A name="ExtenderPatternHandler-Overview"></A><B>Overview</B></H6>
+<UL>
+	<LI><A href="apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</A></LI>
+	<LI><A href="apache-felix-ipojo-feature-overview.html" title="Apache Felix iPOJO Feature Overview">iPOJO Feature Overview</A></LI>
+	<LI><A href="download.html" title="Download">Download &amp; Install </A></LI>
+</UL>
+
+
+<H6><A name="ExtenderPatternHandler-GettingStarted"></A><B>Getting Started</B></H6>
+<UL>
+	<LI><A href="ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</A></LI>
+	<LI><A href="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>
+	<LI><A href="ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</A></LI>
+</UL>
+
+
+<H6><A name="ExtenderPatternHandler-UserGuide"></A><B>User Guide</B></H6>
+<UL>
+	<LI><A href="describing-components.html" title="Describing components">Describing components (handler list) </A></LI>
+	<LI><A href="how-to-use-ipojo-annotations.html" title="How to use iPOJO Annotations">How to use iPOJO Annotations</A></LI>
+	<LI><A href="using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</A></LI>
+	<LI><A href="ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</A></LI>
+	<LI><A href="ipojo-faq.html" title="iPOJO FAQ">FAQ</A></LI>
+</UL>
+
+
+<H6><A name="ExtenderPatternHandler-Tools"></A><B>Tools</B></H6>
+<UL>
+	<LI><A href="ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug&#45;in</A></LI>
+	<LI><A href="ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</A></LI>
+	<LI><A href="ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug&#45;in</A></LI>
+	<LI><A href="ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</A></LI>
+</UL>
+
+
+<H6><A name="ExtenderPatternHandler-DeveloperGuide"></A><B>Developer Guide</B></H6>
+<UL>
+	<LI>API: <SPAN class="nobr"><A href="http://people.apache.org/~clement/ipojo/api/0.8/" title="Visit page outside Confluence" rel="nofollow">0.8<SUP><IMG class="rendericon" src="../../cwiki.apache.org/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"></SUP></A></SPAN></LI>
+	<LI><A href="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="how-to-use-ipojo-manipulation-metadata.html" title="How to use iPOJO Manipulation Metadata">How to use iPOJO Manipulation Metadata</A></LI>
+</UL>
+
+
+<H6><A name="ExtenderPatternHandler-Misc%26Contact"></A><B>Misc &amp; Contact</B></H6>
+<UL>
+	<LI><A href="apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</A></LI>
+	<LI><A href="apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</A></LI>
+	<LI><A href="apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</A></LI>
+	<LI><A href="future-ideas.html" title="Future Ideas">Future Ideas</A></LI>
+	<LI><A href="contact.html" title="Contact">Contact</A></LI>
+	<LI><A href="related-works.html" title="Related Works">Related Works</A></LI>
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