Blame - ipojo/handler/extender/doc/extender-pattern-handler.html - onos-felix

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<H1><A name="ExtenderPatternHandler-Theextenderpatternhandler"></A>The extender pattern handler</H1>

34

<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>

35

<UL>

36

<LI>The extender</LI>

37

<LI>The extension</LI>

</UL>

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>

43

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>

44

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>

45

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>

46

47

<H2><A name="ExtenderPatternHandler-Usingthehandler"></A>Using the handler</H2>

48

<P>First of all, you need to configure the component type to use the handler such as:</P>

49

50

<PRE class="code-xml"><SPAN class="code-tag"><iPOJO <SPAN class="code-keyword">xmlns:extender</SPAN>=<SPAN class="code-quote">"org.apache.felix.ipojo.extender"</SPAN>></SPAN>

51

<Component

52

className=<SPAN class="code-quote">"org.apache.felix.ipojo.extender.myextender"</SPAN>>

<extender:extender

extension=<SPAN class="code-quote">"My-Extension"</SPAN>

57

onArrival=<SPAN class="code-quote">"onBundleArrival"</SPAN>

58

onDeparture=<SPAN class="code-quote">"onBundleDeparture"</SPAN>

59

/>

60

61

<SPAN class="code-tag"><callback transition=<SPAN class="code-quote">"invalidate"</SPAN> method=<SPAN class="code-quote">"stopping"</SPAN> /></SPAN>

62

<SPAN class="code-tag"><callback transition=<SPAN class="code-quote">"validate"</SPAN> method=<SPAN class="code-quote">"starting"</SPAN> /></SPAN>

</DIV></DIV>

<P>Notice that, this handler is an external handler. So, it uses the "org.apache.felix.ipojo.extender" namespace.<BR>

68

Once described, you can implement your component. The methods specified methods will be called when a matching bundle arrives or leaves.<BR>

69

In the previous example, these methods could be: </P>

70

71

<PRE class="code-java">void onBundleArrival(Bundle bundle, <SPAN class="code-object">String</SPAN> header) {

72

<SPAN class="code-comment">// Do something

73

</SPAN>}

74

75

void onBundleDeparture(Bundle bundle) {

76

<SPAN class="code-comment">// Do something

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</SPAN>}</PRE>

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</DIV></DIV>

79

<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>

80

<H2><A name="ExtenderPatternHandler-Configuration"></A>Configuration</H2>

81

<P>The handler has only three mandatory attributes:</P>

82

<UL>

83

<LI>Extension: declaring the looked manifest header.</LI>

84

<LI>onArrival: declaring the method to invoke when a matching bundle arrives</LI>

85

<LI>onDeparture: declaring the method to invoke when a matching bundle leaves</LI>

</UL>

<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>

91

92

<H2><A name="ExtenderPatternHandler-Download"></A>Download</H2>

93

<P>The handler is available on the <A href="download.html" title="Download">download</A> page.<BR>

94

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>

95

96

<H2><A name="ExtenderPatternHandler-Amorerealisticexample"></A>A more realistic example</H2>

97

<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 "Test-Suite" header appears or leaves.</P>

98

</TD>

99

100

<H6><A name="ExtenderPatternHandler-Overview"></A><B>Overview</B></H6>

101

<UL>

102

103

<LI><A href="apache-felix-ipojo-feature-overview.html" title="Apache Felix iPOJO Feature Overview">iPOJO Feature Overview</A></LI>

104

<LI><A href="download.html" title="Download">Download & Install </A></LI>

</UL>

<H6><A name="ExtenderPatternHandler-GettingStarted"></A><B>Getting Started</B></H6>

109

<UL>

110

<LI><A href="ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</A></LI>

111

<LI><A href="ipojo-hello-word-maven-based-tutorial.html" title="iPOJO Hello Word (Maven-Based) tutorial">iPOJO Hello Word (Maven-Based) tutorial</A></LI>

112

<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>

117

<UL>

118

<LI><A href="describing-components.html" title="Describing components">Describing components (handler list) </A></LI>

119

<LI><A href="how-to-use-ipojo-annotations.html" title="How to use iPOJO Annotations">How to use iPOJO Annotations</A></LI>

120

<LI><A href="using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</A></LI>

121

<LI><A href="ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</A></LI>

</UL>

<H6><A name="ExtenderPatternHandler-Tools"></A><B>Tools</B></H6>

127

<UL>

128

<LI><A href="ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug-in</A></LI>

129

<LI><A href="ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</A></LI>

130

<LI><A href="ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug-in</A></LI>

131

<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>

136

<UL>

137

138

<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>

139

<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 & Contact</B></H6>

144

<UL>

145

<LI><A href="apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</A></LI>

146

<LI><A href="apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</A></LI>

147

<LI><A href="apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</A></LI>

148

<LI><A href="future-ideas.html" title="Future Ideas">Future Ideas</A></LI>

149

<LI><A href="contact.html" title="Contact">Contact</A></LI>

150

<LI><A href="related-works.html" title="Related Works">Related Works</A></LI>

151

<LI><A href="article-presentations.html" title="Article & Presentations">Article & Presentations</A></LI>

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Clement Escoffier	130ca57	2008-10-13 07:33:03 +0000	[diff] [blame^]	1
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				32	<TD class="confluenceTd" valign="top" width="80%">
				33	<H1><A name="ExtenderPatternHandler-Theextenderpatternhandler"></A>The extender pattern handler</H1>
				34	<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>
				35	<UL>
				36	<LI>The extender</LI>
				37	<LI>The extension</LI>
				38	</UL>
				39
				40
				41	<P><IMG src="extender-pattern-handler.data/extender.png" align="absmiddle" border="0"><BR>
				42	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>
				43	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>
				44	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>
				45	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>
				46
				47	<H2><A name="ExtenderPatternHandler-Usingthehandler"></A>Using the handler</H2>
				48	<P>First of all, you need to configure the component type to use the handler such as:</P>
				49	<DIV class="code"><DIV class="codeContent">
				50	<PRE class="code-xml"><SPAN class="code-tag"><iPOJO <SPAN class="code-keyword">xmlns:extender</SPAN>=<SPAN class="code-quote">"org.apache.felix.ipojo.extender"</SPAN>></SPAN>
				51	<Component
				52	className=<SPAN class="code-quote">"org.apache.felix.ipojo.extender.myextender"</SPAN>>
				53
				54	<SPAN class="code-tag"><!—Extender Pattern handler configuration --></SPAN>
				55	<extender:extender
				56	extension=<SPAN class="code-quote">"My-Extension"</SPAN>
				57	onArrival=<SPAN class="code-quote">"onBundleArrival"</SPAN>
				58	onDeparture=<SPAN class="code-quote">"onBundleDeparture"</SPAN>
				59	/>
				60
				61	<SPAN class="code-tag"><callback transition=<SPAN class="code-quote">"invalidate"</SPAN> method=<SPAN class="code-quote">"stopping"</SPAN> /></SPAN>
				62	<SPAN class="code-tag"><callback transition=<SPAN class="code-quote">"validate"</SPAN> method=<SPAN class="code-quote">"starting"</SPAN> /></SPAN>
				63	<SPAN class="code-tag"><provides /></SPAN>
				64	<SPAN class="code-tag"></Component></SPAN>
				65	<SPAN class="code-tag"></iPOJO></SPAN></PRE>
				66	</DIV></DIV>
				67	<P>Notice that, this handler is an external handler. So, it uses the "org.apache.felix.ipojo.extender" namespace.<BR>
				68	Once described, you can implement your component. The methods specified methods will be called when a matching bundle arrives or leaves.<BR>
				69	In the previous example, these methods could be: </P>
				70	<DIV class="code"><DIV class="codeContent">
				71	<PRE class="code-java">void onBundleArrival(Bundle bundle, <SPAN class="code-object">String</SPAN> header) {
				72	<SPAN class="code-comment">// Do something
				73	</SPAN>}
				74
				75	void onBundleDeparture(Bundle bundle) {
				76	<SPAN class="code-comment">// Do something
				77	</SPAN>}</PRE>
				78	</DIV></DIV>
				79	<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>
				80	<H2><A name="ExtenderPatternHandler-Configuration"></A>Configuration</H2>
				81	<P>The handler has only three mandatory attributes:</P>
				82	<UL>
				83	<LI>Extension: declaring the looked manifest header.</LI>
				84	<LI>onArrival: declaring the method to invoke when a matching bundle arrives</LI>
				85	<LI>onDeparture: declaring the method to invoke when a matching bundle leaves</LI>
				86	</UL>
				87
				88
				89	<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>
				90	<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>
				91
				92	<H2><A name="ExtenderPatternHandler-Download"></A>Download</H2>
				93	<P>The handler is available on the <A href="download.html" title="Download">download</A> page.<BR>
				94	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>
				95
				96	<H2><A name="ExtenderPatternHandler-Amorerealisticexample"></A>A more realistic example</H2>
				97	<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 "Test-Suite" header appears or leaves.</P>
				98	</TD>
				99	<TD class="confluenceTd" valign="top" width="20%">
				100	<H6><A name="ExtenderPatternHandler-Overview"></A><B>Overview</B></H6>
				101	<UL>
				102	<LI><A href="apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</A></LI>
				103	<LI><A href="apache-felix-ipojo-feature-overview.html" title="Apache Felix iPOJO Feature Overview">iPOJO Feature Overview</A></LI>
				104	<LI><A href="download.html" title="Download">Download & Install </A></LI>
				105	</UL>
				106
				107
				108	<H6><A name="ExtenderPatternHandler-GettingStarted"></A><B>Getting Started</B></H6>
				109	<UL>
				110	<LI><A href="ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</A></LI>
				111	<LI><A href="ipojo-hello-word-maven-based-tutorial.html" title="iPOJO Hello Word (Maven-Based) tutorial">iPOJO Hello Word (Maven-Based) tutorial</A></LI>
				112	<LI><A href="ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</A></LI>
				113	</UL>
				114
				115
				116	<H6><A name="ExtenderPatternHandler-UserGuide"></A><B>User Guide</B></H6>
				117	<UL>
				118	<LI><A href="describing-components.html" title="Describing components">Describing components (handler list) </A></LI>
				119	<LI><A href="how-to-use-ipojo-annotations.html" title="How to use iPOJO Annotations">How to use iPOJO Annotations</A></LI>
				120	<LI><A href="using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</A></LI>
				121	<LI><A href="ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</A></LI>
				122	<LI><A href="ipojo-faq.html" title="iPOJO FAQ">FAQ</A></LI>
				123	</UL>
				124
				125
				126	<H6><A name="ExtenderPatternHandler-Tools"></A><B>Tools</B></H6>
				127	<UL>
				128	<LI><A href="ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug-in</A></LI>
				129	<LI><A href="ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</A></LI>
				130	<LI><A href="ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug-in</A></LI>
				131	<LI><A href="ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</A></LI>
				132	</UL>
				133
				134
				135	<H6><A name="ExtenderPatternHandler-DeveloperGuide"></A><B>Developer Guide</B></H6>
				136	<UL>
				137	<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>
				138	<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>
				139	<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>
				140	</UL>
				141
				142
				143	<H6><A name="ExtenderPatternHandler-Misc%26Contact"></A><B>Misc & Contact</B></H6>
				144	<UL>
				145	<LI><A href="apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</A></LI>
				146	<LI><A href="apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</A></LI>
				147	<LI><A href="apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</A></LI>
				148	<LI><A href="future-ideas.html" title="Future Ideas">Future Ideas</A></LI>
				149	<LI><A href="contact.html" title="Contact">Contact</A></LI>
				150	<LI><A href="related-works.html" title="Related Works">Related Works</A></LI>
				151	<LI><A href="article-presentations.html" title="Article & Presentations">Article & Presentations</A></LI>
				152	</UL>
				153
				154
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