Blame - ipojo/handler/whiteboard/doc/white-board-pattern-handler.html - onos-felix

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<H1><A name="WhiteBoardPatternHandler-Thewhiteboardpatternhandler"></A>The white board pattern handler</H1>

34

<P>The objective of this handler is to simplify the development of white-board architecture. This architecture-style is based is very close to the extender architecture style but use services instead of bundles.<BR>

35

A whiteboard is based on two different roles:</P>

36

37

<LI>A consumer looking to special services or a services published with a special mark</LI>

38

<LI>Looked services</LI>

</UL>

<P>More information on this pattern is available in this <SPAN class="nobr"><A href="http://www.osgi.org/wiki/uploads/Links/whiteboard.pdf" title="Visit page outside Confluence" rel="nofollow">document<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><BR>

43

Implementing a white board pattern could be complex as the extender needs to track these services dynamically. Indeed looked services can be highly dynamic; they can arrive, leave or be modified at runtime.<BR>

44

Several services specified in the OSGi specification use white board pattern such as the Device Access Manager.</P>

45

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

46

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

47

48

<PRE class="code-xml"><SPAN class="code-tag"><ipojo <SPAN class="code-keyword">xmlns:wbp</SPAN>=<SPAN class="code-quote">"org.apache.felix.ipojo.white-board-pattern"</SPAN>></SPAN>

49

<component

50

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

51

>

52

<wbp:wbp

53

filter=<SPAN class="code-quote">"(my.property=1)"</SPAN>

54

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

55

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

56

onModification=<SPAN class="code-quote">"onModification"</SPAN>

/>

</DIV></DIV>

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

63

Once described, you can implement your component. The methods specified methods will be called when a matching services arrives or leaves or are modified. The modification callback is optional. A matching service is detected by confronting the service reference against the specified filter.<BR>

64

The filter can target specific service interface (with the objectclass property) or property values.<BR>

65

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

66

67

<PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class FooWhiteBoardPattern <SPAN class="code-keyword">implements</SPAN> Observable {

68

List list = <SPAN class="code-keyword">new</SPAN> ArrayList();

69

<SPAN class="code-object">int</SPAN> modifications = 0;

70

<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">synchronized</SPAN> void onArrival(ServiceReference ref) {

71

list.add(ref);

72

}

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<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">synchronized</SPAN> void onDeparture(ServiceReference ref) {

74

list.remove(ref);

75

}

76

<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">synchronized</SPAN> void onModification(ServiceReference ref) {

77

modifications = modifications + 1;

78

}

79

<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">synchronized</SPAN> Map getObservations() {

80

Map map = <SPAN class="code-keyword">new</SPAN> HashMap();

81

map.put(<SPAN class="code-quote">"list"</SPAN>, list);

82

map.put(<SPAN class="code-quote">"modifications"</SPAN>, <SPAN class="code-keyword">new</SPAN> <SPAN class="code-object">Integer</SPAN>(modifications));

83

<SPAN class="code-keyword">return</SPAN> map;

84

}</PRE>

85

</DIV></DIV>

86

<P>All method received the arriving, leaving or modified service reference.</P>

87

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

88

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

89

<UL>

90

<LI>Filter: filter use to discover matching filter.</LI>

91

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

92

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

</UL>

<P>The onModification attribute is optional. This method is called when an injected service reference is modified but stills valid against the filter.</P>

97

98

<P>The implementation will be notified of arrivals, modifications 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>

99

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

100

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

101

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/whiteboard" title="Visit page outside Confluence" rel="nofollow">http://svn.apache.org/repos/asf/felix/trunk/ipojo/handler/whiteboard<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></TD>

102

103

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

104

<UL>

105

106

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

107

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

</UL>

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

112

<UL>

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

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<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>

115

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

</UL>

<H6><A name="WhiteBoardPatternHandler-UserGuide"></A><B>User Guide</B></H6>

120

<UL>

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

122

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

123

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

124

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

</UL>

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

130

<UL>

131

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

132

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

133

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

134

<LI><A href="ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</A></LI>

</UL>

<H6><A name="WhiteBoardPatternHandler-DeveloperGuide"></A><B>Developer Guide</B></H6>

139

<UL>

140

141

<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>

142

<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="WhiteBoardPatternHandler-Misc%26Contact"></A><B>Misc & Contact</B></H6>

147

<UL>

148

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

149

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

150

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

151

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

152

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

153

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

154

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

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Clement Escoffier	8350751	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="WhiteBoardPatternHandler-Thewhiteboardpatternhandler"></A>The white board pattern handler</H1>
				34	<P>The objective of this handler is to simplify the development of white-board architecture. This architecture-style is based is very close to the extender architecture style but use services instead of bundles.<BR>
				35	A whiteboard is based on two different roles:</P>
				36	<UL class="alternate" type="square">
				37	<LI>A consumer looking to special services or a services published with a special mark</LI>
				38	<LI>Looked services</LI>
				39	</UL>
				40
				41
				42	<P>More information on this pattern is available in this <SPAN class="nobr"><A href="http://www.osgi.org/wiki/uploads/Links/whiteboard.pdf" title="Visit page outside Confluence" rel="nofollow">document<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><BR>
				43	Implementing a white board pattern could be complex as the extender needs to track these services dynamically. Indeed looked services can be highly dynamic; they can arrive, leave or be modified at runtime.<BR>
				44	Several services specified in the OSGi specification use white board pattern such as the Device Access Manager.</P>
				45	<H2><A name="WhiteBoardPatternHandler-Usingthehandler"></A>Using the handler</H2>
				46	<P>First of all, you need to configure the component type to use the handler such as:</P>
				47	<DIV class="code"><DIV class="codeContent">
				48	<PRE class="code-xml"><SPAN class="code-tag"><ipojo <SPAN class="code-keyword">xmlns:wbp</SPAN>=<SPAN class="code-quote">"org.apache.felix.ipojo.white-board-pattern"</SPAN>></SPAN>
				49	<component
				50	className=<SPAN class="code-quote">"org.apache.felix.ipojo.test.FooWhiteBoardPattern"</SPAN>
				51	>
				52	<wbp:wbp
				53	filter=<SPAN class="code-quote">"(my.property=1)"</SPAN>
				54	onArrival=<SPAN class="code-quote">"onArrival"</SPAN>
				55	onDeparture=<SPAN class="code-quote">"onDeparture"</SPAN>
				56	onModification=<SPAN class="code-quote">"onModification"</SPAN>
				57	/>
				58
				59	<SPAN class="code-tag"><provides/></SPAN>
				60	<SPAN class="code-tag"></component></SPAN></PRE>
				61	</DIV></DIV>
				62	<P>Notice that, this handler is an external handler. So, it uses the "org.apache.felix.ipojo.white-board-patter" namespace.<BR>
				63	Once described, you can implement your component. The methods specified methods will be called when a matching services arrives or leaves or are modified. The modification callback is optional. A matching service is detected by confronting the service reference against the specified filter.<BR>
				64	The filter can target specific service interface (with the objectclass property) or property values.<BR>
				65	In the previous example, these methods could be: </P>
				66	<DIV class="code"><DIV class="codeContent">
				67	<PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class FooWhiteBoardPattern <SPAN class="code-keyword">implements</SPAN> Observable {
				68	List list = <SPAN class="code-keyword">new</SPAN> ArrayList();
				69	<SPAN class="code-object">int</SPAN> modifications = 0;
				70	<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">synchronized</SPAN> void onArrival(ServiceReference ref) {
				71	list.add(ref);
				72	}
				73	<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">synchronized</SPAN> void onDeparture(ServiceReference ref) {
				74	list.remove(ref);
				75	}
				76	<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">synchronized</SPAN> void onModification(ServiceReference ref) {
				77	modifications = modifications + 1;
				78	}
				79	<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">synchronized</SPAN> Map getObservations() {
				80	Map map = <SPAN class="code-keyword">new</SPAN> HashMap();
				81	map.put(<SPAN class="code-quote">"list"</SPAN>, list);
				82	map.put(<SPAN class="code-quote">"modifications"</SPAN>, <SPAN class="code-keyword">new</SPAN> <SPAN class="code-object">Integer</SPAN>(modifications));
				83	<SPAN class="code-keyword">return</SPAN> map;
				84	}</PRE>
				85	</DIV></DIV>
				86	<P>All method received the arriving, leaving or modified service reference.</P>
				87	<H2><A name="WhiteBoardPatternHandler-Configuration"></A>Configuration</H2>
				88	<P>The handler has only three mandatory attributes:</P>
				89	<UL>
				90	<LI>Filter: filter use to discover matching filter.</LI>
				91	<LI>onArrival: declaring the method to invoke when a matching service arrives</LI>
				92	<LI>onDeparture: declaring the method to invoke when a matching service leaves</LI>
				93	</UL>
				94
				95
				96	<P>The onModification attribute is optional. This method is called when an injected service reference is modified but stills valid against the filter.</P>
				97	<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>
				98	<P>The implementation will be notified of arrivals, modifications 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>
				99	<H2><A name="WhiteBoardPatternHandler-Download"></A>Download</H2>
				100	<P>The handler is available on the <A href="download.html" title="Download">download</A> page.<BR>
				101	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/whiteboard" title="Visit page outside Confluence" rel="nofollow">http://svn.apache.org/repos/asf/felix/trunk/ipojo/handler/whiteboard<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></TD>
				102	<TD class="confluenceTd" valign="top" width="20%">
				103	<H6><A name="WhiteBoardPatternHandler-Overview"></A><B>Overview</B></H6>
				104	<UL>
				105	<LI><A href="apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</A></LI>
				106	<LI><A href="apache-felix-ipojo-feature-overview.html" title="Apache Felix iPOJO Feature Overview">iPOJO Feature Overview</A></LI>
				107	<LI><A href="download.html" title="Download">Download & Install </A></LI>
				108	</UL>
				109
				110
				111	<H6><A name="WhiteBoardPatternHandler-GettingStarted"></A><B>Getting Started</B></H6>
				112	<UL>
				113	<LI><A href="ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</A></LI>
				114	<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>
				115	<LI><A href="ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</A></LI>
				116	</UL>
				117
				118
				119	<H6><A name="WhiteBoardPatternHandler-UserGuide"></A><B>User Guide</B></H6>
				120	<UL>
				121	<LI><A href="describing-components.html" title="Describing components">Describing components (handler list) </A></LI>
				122	<LI><A href="how-to-use-ipojo-annotations.html" title="How to use iPOJO Annotations">How to use iPOJO Annotations</A></LI>
				123	<LI><A href="using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</A></LI>
				124	<LI><A href="ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</A></LI>
				125	<LI><A href="ipojo-faq.html" title="iPOJO FAQ">FAQ</A></LI>
				126	</UL>
				127
				128
				129	<H6><A name="WhiteBoardPatternHandler-Tools"></A><B>Tools</B></H6>
				130	<UL>
				131	<LI><A href="ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug-in</A></LI>
				132	<LI><A href="ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</A></LI>
				133	<LI><A href="ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug-in</A></LI>
				134	<LI><A href="ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</A></LI>
				135	</UL>
				136
				137
				138	<H6><A name="WhiteBoardPatternHandler-DeveloperGuide"></A><B>Developer Guide</B></H6>
				139	<UL>
				140	<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>
				141	<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>
				142	<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>
				143	</UL>
				144
				145
				146	<H6><A name="WhiteBoardPatternHandler-Misc%26Contact"></A><B>Misc & Contact</B></H6>
				147	<UL>
				148	<LI><A href="apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</A></LI>
				149	<LI><A href="apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</A></LI>
				150	<LI><A href="apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</A></LI>
				151	<LI><A href="future-ideas.html" title="Future Ideas">Future Ideas</A></LI>
				152	<LI><A href="contact.html" title="Contact">Contact</A></LI>
				153	<LI><A href="related-works.html" title="Related Works">Related Works</A></LI>
				154	<LI><A href="article-presentations.html" title="Article & Presentations">Article & Presentations</A></LI>
				155	</UL>
				156
				157
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