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Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]5<!-- Mirrored Site: felix.apache.org. File: /site/providing-osgi-services.html. Date: Mon, 13 Oct 2008 06:53:06 GMT -->
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Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]29 </DIV>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]30 <DIV class="main">
31<TABLE class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><TBODY><TR>
32<TD class="confluenceTd" valign="top" width="80%">
33<H1><A name="ProvidingOSGiservices-ProvidingOSGiservices"></A>Providing OSGi services</H1>
34
35<P>This handler allows publishing OSGi services. It manages:</P>
36<UL>
37 <LI>service publication</LI>
38 <LI>service object creation</LI>
39 <LI>service un-registration</LI>
40 <LI>configuration property propagation</LI>
41</UL>
42
43
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]44<P><IMG src="providing-osgi-services.data/ps-simple.png" handler="" overview="" align="absmiddle" border="0"></P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]45
46<H1><A name="ProvidingOSGiservices-Asimpleexample"></A><B>A simple example</B></H1>
47
48<P>The following code snippet shows a simple class implementing the FooService interface:</P>
49<DIV class="code"><DIV class="codeContent">
50<PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class FooProviderType1 <SPAN class="code-keyword">implements</SPAN> FooService {
51 <SPAN class="code-keyword">private</SPAN> <SPAN class="code-object">String</SPAN> m_foo = <SPAN class="code-quote">&quot;foo&quot;</SPAN>;
52
53 <SPAN class="code-keyword">public</SPAN> void foo() {
54 <SPAN class="code-object">System</SPAN>.out.println(<SPAN class="code-quote">&quot;foo &quot;</SPAN> + m_foo);
55 }
56
57}</PRE>
58</DIV></DIV>
59<P>To provide a service, the implementation class <B>NEEDS</B> to implement the service interface. By the way, it guaranties that each methods of the service interface are implemented.</P>
60
61<P>To provide the service, the component type needs to declare the providing:</P>
62<DIV class="code"><DIV class="codeContent">
63<PRE class="code-xml"><SPAN class="code-tag">&lt;component className=<SPAN class="code-quote">&quot;...FooProviderType1&quot;</SPAN>&gt;</SPAN>
64 <SPAN class="code-tag">&lt;provides/&gt;</SPAN>
65<SPAN class="code-tag">&lt;/component&gt;</SPAN></PRE>
66</DIV></DIV>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]67<P><IMG src="providing-osgi-services.data/ps-foo.png" align="absmiddle" border="0"></P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]68
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]69<P>The &lt;provides/&gt; element suffice to declare that each instance of this type will provide the FooService. Indeed, the provided interface can be discovered by analyzing the implementation class. By default, all implemented interface are published in the same service registration. iPOJO looks down the entire inheritance tree.</P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]70
71<H1><A name="ProvidingOSGiservices-ServicePublication"></A><B>Service Publication</B></H1>
72
73<P>The provided service handler manages the service publication and providing. For each declared <EM>provides</EM>, the handler register a service. The service is published as long as the instance is valid. If the instance becomes invalid, the service is removed from the service registry.</P>
74
75<P>By default, it publishes all interfaces implemented by the implementation class of the component class. It collects all super-interfaces (interfaces implemented by implemented interfaces and by super class). However it is possible to set exposed interface with the <EM>interface</EM> attribute to avoid to exposes all collected interfaces.</P>
76
77<P>The following xml snippet is equivalent to the previous example:</P>
78<DIV class="code"><DIV class="codeContent">
79<PRE class="code-xml"><SPAN class="code-tag">&lt;component className=<SPAN class="code-quote">&quot;...FooProviderType1&quot;</SPAN>&gt;</SPAN>
80 <SPAN class="code-tag">&lt;provides interface=<SPAN class="code-quote">&quot;...FooService &quot;</SPAN>/&gt;</SPAN>
81<SPAN class="code-tag">&lt;/component&gt;</SPAN></PRE>
82</DIV></DIV>
83<P>If the implementation class implements several interfaces, all these interfaces are published by default in the same service publication. You can use the interface attribute to set exactly published interfaces. If you want to publish several interfaces, you can use the following syntax:</P>
84<DIV class="code"><DIV class="codeContent">
85<PRE class="code-xml"><SPAN class="code-tag">&lt;component className=<SPAN class="code-quote">&quot;...FooProviderType1&quot;</SPAN>&gt;</SPAN>
86 <SPAN class="code-tag">&lt;provides interface=<SPAN class="code-quote">&quot;{...FooService, ...BarService}&quot;</SPAN>/&gt;</SPAN>
87<SPAN class="code-tag">&lt;/component&gt;</SPAN></PRE>
88</DIV></DIV>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]89<P><IMG src="providing-osgi-services.data/ps-foobar.png" align="absmiddle" border="0"></P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]90
91<P><EM>Note</EM>: if you use the interface attribute, the handler check that all declared interface are really implemented by the implementation class. If an interface is not implemented, the handler throws an error.</P>
92
93<P><EM>Note</EM>: if the implementation class does not implement any interface, you cannot provide a service. In this case, the handler throws an error.</P>
94
95<H1><A name="ProvidingOSGiservices-ServiceProperties"></A><B>Service Properties</B></H1>
96
97<P>The handler can manage service properties. Service properties are attached to published service and allow consumer filtering providers. A property can be attached to a field (contained in the component implementation class), and so by handle dynamically.</P>
98
99<P>Let's take a new example very closed of the last one:</P>
100<DIV class="code"><DIV class="codeContent">
101<PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class FooProviderType1 <SPAN class="code-keyword">implements</SPAN> FooService {
102 <SPAN class="code-keyword">private</SPAN> <SPAN class="code-object">String</SPAN> m_foo;
103 <SPAN class="code-keyword">public</SPAN> void foo() {
104 <SPAN class="code-object">System</SPAN>.out.println(<SPAN class="code-quote">&quot;foo &quot;</SPAN> + m_foo);
105 m_foo = <SPAN class="code-quote">&quot;bar&quot;</SPAN>;
106 }
107}</PRE>
108</DIV></DIV>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]109<P>Remark that the m_foo field does not have any value. The following snippet shows a component publishing the <EM>FooService</EM> with two properties:</P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]110<DIV class="code"><DIV class="codeContent">
111<PRE class="code-xml"><SPAN class="code-tag">&lt;component className=<SPAN class="code-quote">&quot;...FooProviderType1&quot;</SPAN>&gt;</SPAN>
112 <SPAN class="code-tag">&lt;provides&gt;</SPAN>
113 <SPAN class="code-tag">&lt;property name=<SPAN class="code-quote">&quot;foo&quot;</SPAN> field=<SPAN class="code-quote">&quot;m_foo&quot;</SPAN> value=<SPAN class="code-quote">&quot;Foo&quot;</SPAN>&gt;</SPAN>
114 <SPAN class="code-tag">&lt;property name=<SPAN class="code-quote">&quot;intProps&quot;</SPAN> type=<SPAN class="code-quote">&quot;int&quot;</SPAN> value=<SPAN class="code-quote">&quot;5&quot;</SPAN>&gt;</SPAN>
115 <SPAN class="code-tag">&lt;/provides&gt;</SPAN>
116<SPAN class="code-tag">&lt;/component&gt;</SPAN></PRE>
117</DIV></DIV>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]118<P>The first declared property will be attached to the m_foo field. This property is published with the name <EM>foo</EM>. This property has a default value &quot;Foo&quot;. This value will be injected in the _m_foo_ field, when this field asks for a value. A property with a field attribute does not need to declare a type (the type can be discovered by analyzing the implementation class).</P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]119
120<P>The second property is published with the name <EM>intProps</EM>. This property is not attached to a field, so, we need to declare the property type. All primitive types or objects can be used has property type (for object, the qualified name of the class is used as java.lang.String).</P>
121
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]122<P><IMG src="providing-osgi-services.data/ps-foo2.png" align="absmiddle" border="0"></P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]123
124<P>The implementation class set a new value to the _m_foo_ field in the code. When this action occurs, the handler will modify the service publication to update the <EM>foo</EM> property published value. If a published property value becomes <EM>null</EM>, the property is unpublished since it has a new value.</P>
125
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]126<P><IMG src="providing-osgi-services.data/ps-foo3.png" align="absmiddle" border="0"></P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]127
128<P>If property does not have default value, the instance configuration needs to set a value for each unvalued property. Moreover, the instance can override the property value. The following xml snippet shows the declaration of an instance overriding the property values:</P>
129<DIV class="code"><DIV class="codeContent">
130<PRE class="code-xml"><SPAN class="code-tag">&lt;instance component=<SPAN class="code-quote">&quot;...FooProviderType1&quot;</SPAN> name=<SPAN class="code-quote">&quot;myFooServiceProvider&quot;</SPAN>&gt;</SPAN>
131 <SPAN class="code-tag">&lt;property name=<SPAN class="code-quote">&quot;foo&quot;</SPAN> value=<SPAN class="code-quote">&quot;baz&quot;</SPAN>/&gt;</SPAN>
132 <SPAN class="code-tag">&lt;property name=<SPAN class="code-quote">&quot;intProps&quot;</SPAN> value=<SPAN class="code-quote">&quot;2&quot;</SPAN>/&gt;</SPAN>
133<SPAN class="code-tag">&lt;/instance&gt;</SPAN></PRE>
134</DIV></DIV>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]135<P><IMG src="providing-osgi-services.data/ps-foo4.png" align="absmiddle" border="0"></P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]136
137<P>Properties can be attached to a method too. When a property receive a new value, this method is called with the new value in parameter. For example, when the foo property receive a new value (at instance creation or when the instance is reconfigured), the <EM>fooMethod</EM> is called. The <EM>fooMethod</EM> must have only one argument of the Foo type (String in the example).</P>
138<DIV class="code"><DIV class="codeContent">
139<PRE class="code-xml"><SPAN class="code-tag">&lt;component className=<SPAN class="code-quote">&quot;...FooProviderType1&quot;</SPAN>&gt;</SPAN>
140 <SPAN class="code-tag">&lt;provides&gt;</SPAN>
141 <SPAN class="code-tag">&lt;property name=<SPAN class="code-quote">&quot;foo&quot;</SPAN> method=<SPAN class="code-quote">&quot;fooMethod&quot;</SPAN> value=<SPAN class="code-quote">&quot;Foo&quot;</SPAN>&gt;</SPAN>
142 <SPAN class="code-tag">&lt;property name=<SPAN class="code-quote">&quot;intProps&quot;</SPAN> type=<SPAN class="code-quote">&quot;int&quot;</SPAN> value=<SPAN class="code-quote">&quot;5&quot;</SPAN>&gt;</SPAN>
143 <SPAN class="code-tag">&lt;/provides&gt;</SPAN>
144<SPAN class="code-tag">&lt;/component&gt;</SPAN></PRE>
145</DIV></DIV>
146<DIV class="code"><DIV class="codeContent">
147<PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class FooProviderType1 <SPAN class="code-keyword">implements</SPAN> FooService {
148 <SPAN class="code-keyword">private</SPAN> <SPAN class="code-object">String</SPAN> m_foo;
149 <SPAN class="code-keyword">public</SPAN> void foo() {
150 <SPAN class="code-object">System</SPAN>.out.println(<SPAN class="code-quote">&quot;foo &quot;</SPAN> + m_foo);
151 } void fooMethod(<SPAN class="code-object">String</SPAN> newFoo) {
152 m_foo = newFoo;
153 }</PRE>
154</DIV></DIV>
155<P>A property can declare both a field and a method. In this case, the field receive the value and then the method is called.&nbsp;</P>
156<DIV class="code"><DIV class="codeContent">
157<PRE class="code-java">&lt;component className=<SPAN class="code-quote">&quot;...FooProviderType1&quot;</SPAN>&gt;
158 &lt;provides&gt;
159 &lt;property name=<SPAN class="code-quote">&quot;foo&quot;</SPAN> method=<SPAN class="code-quote">&quot;fooMethod&quot;</SPAN> field=<SPAN class="code-quote">&quot;m_foo&quot;</SPAN> value=<SPAN class="code-quote">&quot;Foo&quot;</SPAN>&gt;
160 &lt;property name=<SPAN class="code-quote">&quot;intProps&quot;</SPAN> type=<SPAN class="code-quote">&quot;<SPAN class="code-object">int</SPAN>&quot;</SPAN> value=<SPAN class="code-quote">&quot;5&quot;</SPAN>&gt;
161 &lt;/provides&gt;
162&lt;/component&gt;</PRE>
163</DIV></DIV>
164<DIV class="code"><DIV class="codeContent">
165<PRE class="code-java"><SPAN class="code-keyword">public</SPAN> class FooProviderType1 <SPAN class="code-keyword">implements</SPAN> FooService {
166 <SPAN class="code-keyword">private</SPAN> <SPAN class="code-object">String</SPAN> m_foo;
167 <SPAN class="code-keyword">public</SPAN> void foo() {
168 <SPAN class="code-object">System</SPAN>.out.println(<SPAN class="code-quote">&quot;foo &quot;</SPAN> + m_foo);
169 } void fooMethod(<SPAN class="code-object">String</SPAN> newFoo) {
170 <SPAN class="code-object">System</SPAN>.out.println(<SPAN class="code-quote">&quot;Update foo : &quot;</SPAN> + m_foo);
171 }</PRE>
172</DIV></DIV>
173
174<H1><A name="ProvidingOSGiservices-Advancedfeatures"></A>Advanced features</H1>
175
176
177<H2><A name="ProvidingOSGiservices-ServiceServing%26ObjectCreation"></A><B>Service Serving &amp; Object Creation</B></H2>
178
179<P>When a consumer requires the published service, the handler sends an object (instance) of the implementation class. By default, it is always the same instance. If no instance already exists, an instance is created.</P>
180
181<P>However, the handler supports the OSGi <EM>Service Factory</EM>. In this case, for each requester bundle, the handler sends a new object. To activate this policy, add the <EM>factory</EM> attribute in the <EM>provides</EM> element:</P>
182<DIV class="code"><DIV class="codeContent">
183<PRE class="code-xml"><SPAN class="code-tag">&lt;provides factory=<SPAN class="code-quote">&quot;SERVICE&quot;</SPAN>/&gt;</SPAN></PRE>
184</DIV></DIV>
185
186<H2><A name="ProvidingOSGiservices-SeveralServiceProviding"></A><B>Several Service Providing</B></H2>
187
188<P>You can declare several <EM>provides</EM> inside the same component. All this provided service will be manage by the same handler but separately. Several services will be published (with different service registrations). This case is useful when service properties are different for the different services.</P>
189<DIV class="code"><DIV class="codeContent">
190<PRE class="code-java">&lt;component className=<SPAN class="code-quote">&quot;...FooProviderType1&quot;</SPAN>&gt;
191 &lt;provides <SPAN class="code-keyword">interface</SPAN>=<SPAN class="code-quote">&quot;...Foo&quot;</SPAN>/&gt;
192 &lt;provides <SPAN class="code-keyword">interface</SPAN>=<SPAN class="code-quote">&quot;...Bar&quot;</SPAN>&gt;
193 &lt;property name=<SPAN class="code-quote">&quot;foo&quot;</SPAN> value=<SPAN class="code-quote">&quot;baz&quot;</SPAN>/&gt;
194 &lt;/provides&gt;
195&lt;/component&gt;</PRE>
196</DIV></DIV>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]197<P><IMG src="providing-osgi-services.data/ps-foobar2.png" align="absmiddle" border="0"></P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]198
199<H2><A name="ProvidingOSGiservices-ServicePropertyPropagation"></A><B>Service Property Propagation</B></H2>
200
201<P>The configuration handler has the possibility to propagate received properties to service publication. So, when the propagation is activated, all properties received by the configuration handler will be propagated to all published service. If some properties are mapped on methods, these methods are invoked with the new value in argument.</P>
202
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]203<P><IMG src="providing-osgi-services.data/ps-propagation.png" align="absmiddle" border="0"></P>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]204
205<H2><A name="ProvidingOSGiservices-Instancereconfiguration"></A><B>Instance reconfiguration</B></H2>
206
207<P>The handler supports instance reconfiguration. When an instance is dynamically reconfigured, if the new configuration updates property values, these value are take into account (both for field, and service publication). If some of these properties have methods, these methods are invoked with the new value in argument.</P>
208</TD>
209<TD class="confluenceTd" valign="top" width="20%">
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]210<H6><A name="ProvidingOSGiservices-Overview"></A><B>Overview</B></H6>
211<UL>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]212 <LI><A href="apache-felix-ipojo.html" title="Apache Felix iPOJO">Home Page</A></LI>
213 <LI><A href="apache-felix-ipojo-feature-overview.html" title="Apache Felix iPOJO Feature Overview">iPOJO Feature Overview</A></LI>
214 <LI><A href="download.html" title="Download">Download &amp; Install </A></LI>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]215</UL>
216
217
218<H6><A name="ProvidingOSGiservices-GettingStarted"></A><B>Getting Started</B></H6>
219<UL>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]220 <LI><A href="ipojo-in-10-minutes.html" title="iPOJO in 10 minutes">iPOJO in 10 minutes</A></LI>
221 <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>
222 <LI><A href="ipojo-advanced-tutorial.html" title="iPOJO Advanced Tutorial">iPOJO Advanced Tutorial</A></LI>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]223</UL>
224
225
226<H6><A name="ProvidingOSGiservices-UserGuide"></A><B>User Guide</B></H6>
227<UL>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]228 <LI><A href="describing-components.html" title="Describing components">Describing components (handler list) </A></LI>
229 <LI><A href="how-to-use-ipojo-annotations.html" title="How to use iPOJO Annotations">How to use iPOJO Annotations</A></LI>
230 <LI><A href="using-xml-schemas.html" title="Using XML Schemas">Using XML Schemas</A></LI>
231 <LI><A href="ipojo-advanced-topics.html" title="iPOJO Advanced Topics">Advanced Topics</A></LI>
232 <LI><A href="ipojo-faq.html" title="iPOJO FAQ">FAQ</A></LI>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]233</UL>
234
235
236<H6><A name="ProvidingOSGiservices-Tools"></A><B>Tools</B></H6>
237<UL>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]238 <LI><A href="ipojo-eclipse-plug-in.html" title="iPOJO Eclipse Plug-in">iPOJO Eclipse Plug&#45;in</A></LI>
239 <LI><A href="ipojo-ant-task.html" title="iPOJO Ant Task">iPOJO Ant Task</A></LI>
240 <LI><A href="ipojo-maven-plug-in.html" title="iPOJO Maven Plug-in">iPOJO Maven Plug&#45;in</A></LI>
241 <LI><A href="ipojo-concepts-overview.html" title="iPOJO Concepts Overview">iPOJO concepts overview</A></LI>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]242</UL>
243
244
245<H6><A name="ProvidingOSGiservices-DeveloperGuide"></A><B>Developer Guide</B></H6>
246<UL>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]247 <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>
248 <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>
249 <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>
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253<H6><A name="ProvidingOSGiservices-Misc%26Contact"></A><B>Misc &amp; Contact</B></H6>
254<UL>
Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]255 <LI><A href="apache-felix-ipojo-issuestracker.html" title="apache-felix-ipojo-issuestracker">Issues Tracker</A></LI>
256 <LI><A href="apache-felix-ipojo-supportedvms.html" title="apache-felix-ipojo-supportedVMs">Supported JVMs</A></LI>
257 <LI><A href="apache-felix-ipojo-supportedosgi.html" title="apache-felix-ipojo-supportedOSGi">Supported OSGi Implementations</A></LI>
258 <LI><A href="future-ideas.html" title="Future Ideas">Future Ideas</A></LI>
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260 <LI><A href="related-works.html" title="Related Works">Related Works</A></LI>
261 <LI><A href="article-presentations.html" title="Article & Presentations">Article &amp; Presentations</A></LI>
Clement Escoffier6b928e92008-05-16 20:33:54 +0000[diff] [blame]262</UL>
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Clement Escoffier83507512008-10-13 07:33:03 +0000[diff] [blame]267<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="../../cwiki.apache.org/confluence/images/icons/feed-icon-32x32.png" align="absmiddle" border="0"><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></DIV></TD></TR></TBODY></TABLE>
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