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<P>(3rd May 2007) This pages and the pages hung off it describe the creation of the module which supports the Spring Component Type that I am working on for a demo. This might be useful to anyone looking to build their own Component Type implementation.</P>
<H2><A name="AddingtheSpringImplementationType-Sequence"></A>Sequence</H2>
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<TH class="confluenceTh"> Order </TH>
<TH class="confluenceTh"> Work Item <BR class="atl-forced-newline"> </TH>
<TH class="confluenceTh"> Comment </TH>
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<TD class="confluenceTd"> 0 <BR class="atl-forced-newline"> </TD>
<TD class="confluenceTd"> implementation-spring module created <BR class="atl-forced-newline">
<BR class="atl-forced-newline">
org.apache.tuscany.implementation.spring package </TD>
<TD class="confluenceTd"> </TD>
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<TD class="confluenceTd"> 1 </TD>
<TD class="confluenceTd"> Created ModuleActivator file <BR class="atl-forced-newline"> </TD>
<TD class="confluenceTd"> Points at the SpringModuleActivator class <BR class="atl-forced-newline"> </TD>
</TR>
<TR>
<TD class="confluenceTd"> 2 </TD>
<TD class="confluenceTd"> Create SpringModuleActivator class </TD>
<TD class="confluenceTd"> Core of the Spring implementation module </TD>
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<TD class="confluenceTd"> 3 <BR class="atl-forced-newline"> </TD>
<TD class="confluenceTd"> Create SpringArtifactProcessor class <BR class="atl-forced-newline"> </TD>
<TD class="confluenceTd"> Reads the implementation.spring xml in the composite file <BR class="atl-forced-newline">
- one required attribute = location, which specifies the location of the Spring application context <BR class="atl-forced-newline">
Creates the implementationSpring instance <BR class="atl-forced-newline">
Initiates resolution of the componentType of the Spring application context by calling SpringXMLComponentTypeLoader <BR class="atl-forced-newline"> </TD>
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<TD class="confluenceTd"> 4 <BR class="atl-forced-newline"> </TD>
<TD class="confluenceTd"> Create SpringXMLComponentTypeLoader class <BR class="atl-forced-newline"> </TD>
<TD class="confluenceTd"> Reads the Spring application context and introspects the Beans referenced from it to determine the component type of the Spring implementation (ie Services, References, Properties) <BR class="atl-forced-newline"> </TD>
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<H2><A name="AddingtheSpringImplementationType-ModuleActivatorfile"></A>ModuleActivator file</H2>
<P>Placed into the resources/META-INF/services directory:</P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java"># Implementation class <SPAN class="code-keyword">for</SPAN> the ExtensionActivator
org.apache.tuscany.implementation.script.ScriptModuleActivator
</PRE>
</DIV></DIV>
<H2><A name="AddingtheSpringImplementationType-SpringModuleActivatorclass%26nbsp%3B"></A>SpringModuleActivator class </H2>
<H4><A name="AddingtheSpringImplementationType-Constructor"></A>Constructor</H4>
<P>Creates resources used by other parts of the Module implementation:</P>
<UL>
<LI>AssemblyFactory</LI>
<LI>JavaInterfaceFactory</LI>
<LI>PolicyFactory</LI>
</UL>
<H4><A name="AddingtheSpringImplementationType-start%28%29"></A>start()</H4>
<P>Takes an ExtensionPointRegistry as input parameter, which provides access to configuration of the core.</P>
<UL>
<LI>Creates a SpringArtifactProcessor and adds to the registry StAXArtifactProcessors</LI>
<LI>Creates a SpringImplementationProviderFactory and adds to the registry ProviderFactories</LI>
</UL>
<P>Creates a series of artifacts that are required by the SpringArtifactProcessor and SpringImplementationProviderFactory:</P>
<UL>
<LI>ExtensibleJavaInterfaceIntrospector (used to introspect Spring Beans)</LI>
<LI>JavaPropertyValueObjectFactory</LI>
</UL>
<H4><A name="AddingtheSpringImplementationType-stop%28%29"></A>stop()</H4>
<P>Removes the SpringArtifactProcessor from the registry StAXArtifactProcessors </P>
<H4><A name="AddingtheSpringImplementationType-getExtensionPoints%28%29%26nbsp%3B"></A>getExtensionPoints() </H4>
<P>Returns a very simple DefaultJavaClassIntrospectorExtensionPoint. </P>
<H2><A name="AddingtheSpringImplementationType-SpringArtifactProcessorclass%26nbsp%3B"></A>SpringArtifactProcessor class </H2>
<P>Handles the <implementation.spring..../> element used in composite files.</P>
<H4><A name="AddingtheSpringImplementationType-Constructor"></A>Constructor</H4>
<P>Takes a series of classes used in loading & resolution:</P>
<UL>
<LI>AssemblyFactory</LI>
<LI>JavaInterfaceFactory</LI>
<LI>JavaInterfaceIntrospector</LI>
<LI>PolicyFactory </LI>
<LI>JavaPropertyValueObjectFactor</LI>
</UL>
<H4><A name="AddingtheSpringImplementationType-read%28%29"></A>read()</H4>
<P>Reads the <implementation.spring.../> element from the composite.</P>
<P>Gets the <B><EM>location</EM></B> attribute - throws an exception if the attribute is missing. </P>
<P>Creates a SpringImplementation instance, sets its location field and returns it. </P>
<H4><A name="AddingtheSpringImplementationType-resolve%28%29%26nbsp%3B"></A>resolve() </H4>
<P>Given the SpringImplementation instance and a ModelResolver, gets the ComponentType for the implementation.</P>
<P>Does this by invoking SpringXMLComponentTypeLoader.load() - will follow up by reading a side file if this does not fully resolve the component type.</P>
<H4><A name="AddingtheSpringImplementationType-getArtifactType%28%29%26nbsp%3B"></A>getArtifactType() </H4>
<P>Returns the fully qualified name of the implementation.spring element (includes the SCA namespace...) </P>
<H2><A name="AddingtheSpringImplementationType-%26nbsp%3BSpringXMLComponentTypeLoaderclass"></A> SpringXMLComponentTypeLoader class</H2>
<OL>
<LI> </LI>
</OL>
<H3><A name="AddingtheSpringImplementationType-ResolutionoftheComponentTypeofSpringapplicationcontext"></A>Resolution of the ComponentType of Spring application context</H3>
<P>ComponentType of the Spring application-context is performed by reading the application-context.xml file and by introspecting the Java beans which it references. This is done by the SpringXMLComponentTypeLoader class.</P>
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