ipojo/core/doc/apache-felix-ipojo-feature-overview.html - onos-felix - Gitiles

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 <html><head>


     <title>Apache Felix - Apache Felix iPOJO Feature Overview</title>
     <link rel="stylesheet" href="apache-felix-ipojo-feature-overview_files/site.css" type="text/css" media="all">
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   </head><body>
     <div class="title"><div class="logo"><a href="http://felix.apache.org/site/index.html"><img alt="Apache Felix" src="apache-felix-ipojo-feature-overview_files/logo.png" border="0"></a></div><div class="header"><a href="http://www.apache.org/"><img alt="Apache" src="apache-felix-ipojo-feature-overview_files/apache.png" border="0"></a></div></div>
     <div class="menu">
 <ul>
 	<li><a href="http://felix.apache.org/site/news.html" title="news">news</a></li>
 	<li><a href="http://felix.apache.org/site/license.html" title="license">license</a></li>
 	<li><span class="nobr"><a href="http://felix.apache.org/site/downloads.cgi" title="Visit page outside Confluence" rel="nofollow">downloads<sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
 	<li><a href="http://felix.apache.org/site/documentation.html" title="documentation">documentation</a></li>
 	<li><a href="http://felix.apache.org/site/mailinglists.html" title="mailinglists">mailing lists</a></li>
 	<li><a href="http://felix.apache.org/site/contributing.html" title="Contributing">contributing</a></li>
 	<li><span class="nobr"><a href="http://www.apache.org/" title="Visit page outside Confluence" rel="nofollow">asf<sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
 	<li><span class="nobr"><a href="http://www.apache.org/foundation/sponsorship.html" title="Visit page outside Confluence" rel="nofollow">sponsorship<sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
 	<li><span class="nobr"><a href="http://www.apache.org/foundation/thanks.html" title="Visit page outside Confluence" rel="nofollow">sponsors<sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span>
 <!-- ApacheCon Ad -->
 <iframe src="apache-felix-ipojo-feature-overview_files/button.html" style="border-width: 0pt; float: left;" scrolling="no" width="135" frameborder="0" height="135"></iframe>
 <p style="height: 100px;">
 <!-- ApacheCon Ad -->
 </p></li></ul> </div>
     <div class="main">
 <table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr>
 <td class="confluenceTd" valign="top" width="80%">
 <h1><a name="ApacheFelixiPOJOFeatureOverview-ApacheFelixiPOJOFeatureOverview"></a>Apache Felix iPOJO Feature Overview</h1>

 <p>This page is an attempt to put all of the features and benefits of
 iPOJO into a single high-level list so that it is easy to see why you
 will want to use iPOJO for your applications. This list is not
 exhaustive, but represents the set of features that are potentially
 most likely to be needed or are unique.</p>

 <h2><a name="ApacheFelixiPOJOFeatureOverview-CoreFeatures"></a>Core Features</h2>

 <ul>
 	<li><b>POJO-based approach</b> - Most      components can simply be POJOs and need not have iPOJO- or OSGi-specific      API in them.</li>
 	<li><b>Simple service provisioning</b> - iPOJO manages all aspects of providing an OSGi      service.
 	<ul>
 		<li><b>Service property management</b>
 		<ul class="alternate" type="square">
 			<li>Can be controlled by configuration properties.</li>
 			<li>Can
 be mapped to member fields and automatically updated by the component
 instance at run time by just changing the member field value.</li>
 		</ul>
 		</li>
 		<li><b>Service life cycle participation</b>
 - The component instance can participate in the service life cycle by
 declaring a boolean member field that indicates when the service is
 actually valid (normally a service is assumed to be valid if the
 component instance's dependencies are satisfied).</li>
 	</ul>
 	</li>
 	<li><b>Rich service dependency model</b> - Automatically manages a full spectrum of      service dependencies.
 	<ul>
 		<li><b>Optional/mandatory</b> service dependencies.</li>
 		<li><b>Singular/aggregate</b> service dependencies.</li>
 		<li><b>Default service implementations</b> - The component can provide default       implementations of dependent services if no providers are available.</li>
 		<li><b>Member field or method injection</b> - Also supported in combination.
 		<ul class="alternate" type="square">
 			<li>Member field injection does not require        cluttering component code with bind/unbind methods.</li>
 			<li>Member method injection supports various method        signatures
 			<ul class="alternate" type="square">
 				<li>method() - Acts as a simple event-callback mechanism.</li>
 				<li>method(&lt;service-interface&gt;         svc) - Receives the service object cast to the         appropriate interface.</li>
 				<li>method(ServiceReference         ref) - Receives the OSGi ServiceReference for the service object.</li>
 				<li>method(ServiceReference
 ref, &lt;service-interface&gt; svc) - Receives the OSGi
 ServiceReference and the service object cast to the appropriate
 interface.</li>
 			</ul>
 			</li>
 		</ul>
 		</li>
 		<li><b>Binding policies</b> -       Allow components to control how/when their dependencies are bound.
 		<ul class="alternate" type="square">
 			<li><b>Static</b> - Static dependencies <b>cannot</b>
 change without invalidating the component instance, so injected
 services typically do not change at run time and service departures
 typically result in the component instance being destroyed and
 potentially recreated.</li>
 			<li><b>Dynamic</b> - Dynamic dependencies <b>can</b> change        without invalidating the component instance, so injected services can        change at run time, but <b>do not</b>
 change with respect to service priority changes (i.e., they do not
 automatically switch if a higher priority service appears).</li>
 			<li><b>Dynamic priority</b> - Dynamic priority dependencies <b>can</b> change without invalidating the component instance and <b>do</b> dynamically update based on service priority rankings at run time.</li>
 		</ul>
 		</li>
 	</ul>
 	</li>
 	<li><b>Configuration property management</b> - Integrated with OSGi Configuration Admin      service.
 	<ul>
 		<li><b>Member field/member method injection</b> - Also supported in combination.</li>
 		<li><b>Service property propagation</b>
 - Configuration properties can be configured to update service
 properties if the component instance is providing a service.</li>
 	</ul>
 	</li>
 	<li><b>Sophisticated concurrency handling</b>
 - Externalizes concurrency issues so that component code does not need
 to worry about services changing while they are in use (i.e., no
 locking protocol in component code).</li>
 	<li><b>Deferred instance creation</b> - POJO instances are not created until they      are actually needed, thus reducing start-up overhead.</li>
 	<li><b>Introspection support</b> -      Supports introspecting a component instance and the state of its      dependencies.
 	<ul>
 		<li>Interactive introspection is supported by an arch command for Felix' shell.</li>
 	</ul>
 	</li>
 	<li><b>Extensible</b>
 - All iPOJO features are implemented via a set of handlers, which is an
 extensibility mechanism open to developers by which they can support
 custom functionality (e.g., exporting a provided service remotely,
 etc.).</li>
 </ul>


 <h2><a name="ApacheFelixiPOJOFeatureOverview-Advanced/ExperimentalFeatures"></a>Advanced/Experimental Features</h2>

 <ul>
 	<li><b>Composite model</b> -      iPOJO supports a flexible architectural-like model for composing services.
 	<ul>
 		<li><b>Flexible composites</b> - A       composite is an abstract component implementation.
 		<ul class="alternate" type="square">
 			<li><b>Sub-services and sub-components</b>
 - Unlike traditional component composition, an iPOJO composite can be
 described in terms of services in addition to sub-components; thus
 sub-service implementation selection is deferred until run time.</li>
 			<li><b>Optional/mandatory</b> sub-services and/or sub-components.</li>
 			<li><b>Singular/aggregate</b> sub-services and/or sub-components.</li>
 		</ul>
 		</li>
 		<li><b>Hierarchical</b> - A       composite component may contain other composite components.
 		<ul class="alternate" type="square">
 			<li><b>Composite scoping</b>
 - A composite acts as a scoping mechanism where
 sub-services/sub-components are not visible externally and external
 services are not visible internally.</li>
 		</ul>
 		</li>
 		<li><b>Service dependencies</b>
 - A composite has the full expressive capabilities of primitive
 components when it comes to service dependencies (see above description
 of service dependencies in core features). <ul class="alternate" type="square">
 			<li>For a composite, a
 service dependency effectively imports an external service into the
 composite scope from its parent composite (which may be the OSGi
 service registry in the root case).</li>
 		</ul>
 		</li>
 		<li><b>Composite is just a component</b> - Composites can be instantiated and       automatically managed just like a primitive component.</li>
 	</ul>
 	</li>
 </ul>

 </td>
 <td class="confluenceTd" valign="top" width="20%">
 <h6><a name="ApacheFelixiPOJOFeatureOverview-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="" 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="ApacheFelixiPOJOFeatureOverview-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="ApacheFelixiPOJOFeatureOverview-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>
 </ul>


 <h6><a name="ApacheFelixiPOJOFeatureOverview-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/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="ApacheFelixiPOJOFeatureOverview-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="apache-felix-ipojo-feature-overview_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="ApacheFelixiPOJOFeatureOverview-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="apache-felix-ipojo-feature-overview_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>


 <hr>
 <div class="" align="center">
 <p><span class="nobr"><a href="http://cwiki.apache.org/confluence/createrssfeed.action?types=blogpost&amp;statuses=created&amp;statuses=modified&amp;spaces=FELIX&amp;labelString=iPOJO&amp;rssType=atom&amp;maxResults=10&amp;timeSpan=5&amp;publicFeed=true&amp;title=iPOJO%20Atom%20Feed" title="Stay tuned!" rel="nofollow"><img src="apache-felix-ipojo-feature-overview_files/feed-icon-32x32.png" align="absmiddle" border="0"><sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></p></div>

 <script type="text/javascript">
 var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
 document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
 </script><script src="apache-felix-ipojo-feature-overview_files/ga.js" type="text/javascript"></script>
 <script type="text/javascript">
 var pageTracker = _gat._getTracker("UA-1518442-4");
 pageTracker._trackPageview();
 </script>
 </td></tr></tbody></table>


     </div>
   </body></html>
	<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<html><head>



	<title>Apache Felix - Apache Felix iPOJO Feature Overview</title>
	<link rel="stylesheet" href="apache-felix-ipojo-feature-overview_files/site.css" type="text/css" media="all">
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	</head><body>
	<div class="title"><div class="logo"><a href="http://felix.apache.org/site/index.html"><img alt="Apache Felix" src="apache-felix-ipojo-feature-overview_files/logo.png" border="0"></a></div><div class="header"><a href="http://www.apache.org/"><img alt="Apache" src="apache-felix-ipojo-feature-overview_files/apache.png" border="0"></a></div></div>
	<div class="menu">
	<ul>
	<li><a href="http://felix.apache.org/site/news.html" title="news">news</a></li>
	<li><a href="http://felix.apache.org/site/license.html" title="license">license</a></li>
	<li><span class="nobr"><a href="http://felix.apache.org/site/downloads.cgi" title="Visit page outside Confluence" rel="nofollow">downloads<sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
	<li><a href="http://felix.apache.org/site/documentation.html" title="documentation">documentation</a></li>
	<li><a href="http://felix.apache.org/site/mailinglists.html" title="mailinglists">mailing lists</a></li>
	<li><a href="http://felix.apache.org/site/contributing.html" title="Contributing">contributing</a></li>
	<li><span class="nobr"><a href="http://www.apache.org/" title="Visit page outside Confluence" rel="nofollow">asf<sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
	<li><span class="nobr"><a href="http://www.apache.org/foundation/sponsorship.html" title="Visit page outside Confluence" rel="nofollow">sponsorship<sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></li>
	<li><span class="nobr"><a href="http://www.apache.org/foundation/thanks.html" title="Visit page outside Confluence" rel="nofollow">sponsors<sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span>
	<!-- ApacheCon Ad -->
	<iframe src="apache-felix-ipojo-feature-overview_files/button.html" style="border-width: 0pt; float: left;" scrolling="no" width="135" frameborder="0" height="135"></iframe>
	<p style="height: 100px;">
	<!-- ApacheCon Ad -->
	</p></li></ul> </div>
	<div class="main">
	<table class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><tbody><tr>
	<td class="confluenceTd" valign="top" width="80%">
	<h1><a name="ApacheFelixiPOJOFeatureOverview-ApacheFelixiPOJOFeatureOverview"></a>Apache Felix iPOJO Feature Overview</h1>

	<p>This page is an attempt to put all of the features and benefits of
	iPOJO into a single high-level list so that it is easy to see why you
	will want to use iPOJO for your applications. This list is not
	exhaustive, but represents the set of features that are potentially
	most likely to be needed or are unique.</p>

	<h2><a name="ApacheFelixiPOJOFeatureOverview-CoreFeatures"></a>Core Features</h2>

	<ul>
	<li><b>POJO-based approach</b> - Most components can simply be POJOs and need not have iPOJO- or OSGi-specific API in them.</li>
	<li><b>Simple service provisioning</b> - iPOJO manages all aspects of providing an OSGi service.
	<ul>
	<li><b>Service property management</b>
	<ul class="alternate" type="square">
	<li>Can be controlled by configuration properties.</li>
	<li>Can
	be mapped to member fields and automatically updated by the component
	instance at run time by just changing the member field value.</li>
	</ul>
	</li>
	<li><b>Service life cycle participation</b>
	- The component instance can participate in the service life cycle by
	declaring a boolean member field that indicates when the service is
	actually valid (normally a service is assumed to be valid if the
	component instance's dependencies are satisfied).</li>
	</ul>
	</li>
	<li><b>Rich service dependency model</b> - Automatically manages a full spectrum of service dependencies.
	<ul>
	<li><b>Optional/mandatory</b> service dependencies.</li>
	<li><b>Singular/aggregate</b> service dependencies.</li>
	<li><b>Default service implementations</b> - The component can provide default implementations of dependent services if no providers are available.</li>
	<li><b>Member field or method injection</b> - Also supported in combination.
	<ul class="alternate" type="square">
	<li>Member field injection does not require cluttering component code with bind/unbind methods.</li>
	<li>Member method injection supports various method signatures
	<ul class="alternate" type="square">
	<li>method() - Acts as a simple event-callback mechanism.</li>
	<li>method(<service-interface> svc) - Receives the service object cast to the appropriate interface.</li>
	<li>method(ServiceReference ref) - Receives the OSGi ServiceReference for the service object.</li>
	<li>method(ServiceReference
	ref, <service-interface> svc) - Receives the OSGi
	ServiceReference and the service object cast to the appropriate
	interface.</li>
	</ul>
	</li>
	</ul>
	</li>
	<li><b>Binding policies</b> - Allow components to control how/when their dependencies are bound.
	<ul class="alternate" type="square">
	<li><b>Static</b> - Static dependencies <b>cannot</b>
	change without invalidating the component instance, so injected
	services typically do not change at run time and service departures
	typically result in the component instance being destroyed and
	potentially recreated.</li>
	<li><b>Dynamic</b> - Dynamic dependencies <b>can</b> change without invalidating the component instance, so injected services can change at run time, but <b>do not</b>
	change with respect to service priority changes (i.e., they do not
	automatically switch if a higher priority service appears).</li>
	<li><b>Dynamic priority</b> - Dynamic priority dependencies <b>can</b> change without invalidating the component instance and <b>do</b> dynamically update based on service priority rankings at run time.</li>
	</ul>
	</li>
	</ul>
	</li>
	<li><b>Configuration property management</b> - Integrated with OSGi Configuration Admin service.
	<ul>
	<li><b>Member field/member method injection</b> - Also supported in combination.</li>
	<li><b>Service property propagation</b>
	- Configuration properties can be configured to update service
	properties if the component instance is providing a service.</li>
	</ul>
	</li>
	<li><b>Sophisticated concurrency handling</b>
	- Externalizes concurrency issues so that component code does not need
	to worry about services changing while they are in use (i.e., no
	locking protocol in component code).</li>
	<li><b>Deferred instance creation</b> - POJO instances are not created until they are actually needed, thus reducing start-up overhead.</li>
	<li><b>Introspection support</b> - Supports introspecting a component instance and the state of its dependencies.
	<ul>
	<li>Interactive introspection is supported by an arch command for Felix' shell.</li>
	</ul>
	</li>
	<li><b>Extensible</b>
	- All iPOJO features are implemented via a set of handlers, which is an
	extensibility mechanism open to developers by which they can support
	custom functionality (e.g., exporting a provided service remotely,
	etc.).</li>
	</ul>


	<h2><a name="ApacheFelixiPOJOFeatureOverview-Advanced/ExperimentalFeatures"></a>Advanced/Experimental Features</h2>

	<ul>
	<li><b>Composite model</b> - iPOJO supports a flexible architectural-like model for composing services.
	<ul>
	<li><b>Flexible composites</b> - A composite is an abstract component implementation.
	<ul class="alternate" type="square">
	<li><b>Sub-services and sub-components</b>
	- Unlike traditional component composition, an iPOJO composite can be
	described in terms of services in addition to sub-components; thus
	sub-service implementation selection is deferred until run time.</li>
	<li><b>Optional/mandatory</b> sub-services and/or sub-components.</li>
	<li><b>Singular/aggregate</b> sub-services and/or sub-components.</li>
	</ul>
	</li>
	<li><b>Hierarchical</b> - A composite component may contain other composite components.
	<ul class="alternate" type="square">
	<li><b>Composite scoping</b>
	- A composite acts as a scoping mechanism where
	sub-services/sub-components are not visible externally and external
	services are not visible internally.</li>
	</ul>
	</li>
	<li><b>Service dependencies</b>
	- A composite has the full expressive capabilities of primitive
	components when it comes to service dependencies (see above description
	of service dependencies in core features). <ul class="alternate" type="square">
	<li>For a composite, a
	service dependency effectively imports an external service into the
	composite scope from its parent composite (which may be the OSGi
	service registry in the root case).</li>
	</ul>
	</li>
	<li><b>Composite is just a component</b> - Composites can be instantiated and automatically managed just like a primitive component.</li>
	</ul>
	</li>
	</ul>

	</td>
	<td class="confluenceTd" valign="top" width="20%">
	<h6><a name="ApacheFelixiPOJOFeatureOverview-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="" 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="ApacheFelixiPOJOFeatureOverview-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="ApacheFelixiPOJOFeatureOverview-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>
	</ul>


	<h6><a name="ApacheFelixiPOJOFeatureOverview-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/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="ApacheFelixiPOJOFeatureOverview-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="apache-felix-ipojo-feature-overview_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="ApacheFelixiPOJOFeatureOverview-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="apache-felix-ipojo-feature-overview_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>


	<hr>
	<div class="" align="center">
	<p><span class="nobr"><a href="http://cwiki.apache.org/confluence/createrssfeed.action?types=blogpost&statuses=created&statuses=modified&spaces=FELIX&labelString=iPOJO&rssType=atom&maxResults=10&timeSpan=5&publicFeed=true&title=iPOJO%20Atom%20Feed" title="Stay tuned!" rel="nofollow"><img src="apache-felix-ipojo-feature-overview_files/feed-icon-32x32.png" align="absmiddle" border="0"><sup><img class="rendericon" src="apache-felix-ipojo-feature-overview_files/linkext7.gif" alt="" align="absmiddle" border="0" width="7" height="7"></sup></a></span></p></div>

	<script type="text/javascript">
	var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
	document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
	</script><script src="apache-felix-ipojo-feature-overview_files/ga.js" type="text/javascript"></script>
	<script type="text/javascript">
	var pageTracker = _gat._getTracker("UA-1518442-4");
	pageTracker._trackPageview();
	</script>
	</td></tr></tbody></table>


	</div>
	</body></html>