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git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1640879 13f79535-47bb-0310-9956-ffa450edef68
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<TITLE>Architecture Guide : Apache Tuscany</TITLE>
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<A href="home.html" title="Apache Tuscany">Apache Tuscany</A> > <A href="home.html" title="Home">Home</A> > <A href="sca-overview.html" title="SCA Overview">SCA Overview</A> > <A href="sca-native.html" title="SCA Native">SCA Native</A> > <A href="sca-native-documentation-menu.html" title="SCA Native Documentation Menu">SCA Native Documentation Menu</A> > <A href="" title="Architecture Guide">Architecture Guide</A>
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<A href="http://mail-archives.apache.org/mod_mbox/ws-tuscany-user">User List</A> | <A href="http://mail-archives.apache.org/mod_mbox/ws-tuscany-dev">Dev List</A> | <A href="http://issues.apache.org/jira/browse/Tuscany">Issue Tracker</A>
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<TABLE class="sectionMacro" border="0" cellpadding="5" cellspacing="0" width="100%"><TBODY><TR><TD class="confluenceTd" valign="top" width="15%">
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<DIV class="panel" style="border-style: solid; border-color: #C3CDA1; "><DIV class="panelHeader" style="border-bottom-style: solid; border-bottom-color: #C3CDA1; background-color: #C3CDA1; "><B>General</B></DIV><DIV class="panelContent" style="background-color: #ECF4D1; ">
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<P><A href="home.html" title="Home">Home</A><BR>
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<SPAN class="nobr"><A href="http://www.apache.org/licenses/LICENSE-2.0.html" title="Visit page outside Confluence" rel="nofollow">License <SUP><IMG class="rendericon" src="http://cwiki.apache.org/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"></SUP></A></SPAN><BR>
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<DIV class="panel" style="border-style: solid; border-color: #b4b4b5; "><DIV class="panelHeader" style="border-bottom-style: solid; border-bottom-color: #b4b4b5; background-color: #C3CDA1; "><B>SCA Native</B></DIV><DIV class="panelContent" style="background-color: #ECF4D1; ">
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<P><A href="sca-native.html" title="SCA Native">SCA Native Home</A><BR>
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<H1><A name="ArchitectureGuide-HighlevelarchitectureviewofSCANative"></A>High level architecture view of SCA Native</H1>
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<P>Tuscany SCA Native consists of the <SPAN class="nobr"><A href="http://svn.apache.org/repos/asf/incubator/tuscany/cpp/sca/runtime/core/" title="Visit page outside Confluence" rel="nofollow">kernel<SUP><IMG class="rendericon" src="http://cwiki.apache.org/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"></SUP></A></SPAN> and <SPAN class="nobr"><A href="http://svn.apache.org/repos/asf/incubator/tuscany/cpp/sca/runtime/extensions/" title="Visit page outside Confluence" rel="nofollow">extensions<SUP><IMG class="rendericon" src="http://cwiki.apache.org/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"></SUP></A></SPAN>.</P>
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<P>The kernel loads any .composite, .xsd, .wsdl or<BR>
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.componentType files found under a directory defined by the<BR>
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TUSCANY_SCACPP_ROOT environment variable. The kernel also loads any<BR>
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extensions found in the Tuscany extensions directory (found in the<BR>
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directory specified by the TUSCANY_SCACPP env variable). The kernel<BR>
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inspects the .composite files and checks that any required extensions<BR>
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that the SCA app uses are loaded, works out how the components are<BR>
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wired together, and then passes the details of the composite to the<BR>
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appropriate extensions. E.g. if the SCDL contains a<BR>
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<implementation.python> element, the contents of that element are<BR>
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passed to the Python extension which will load a defined script, etc.<BR>
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When the SCA app is invoked (via a local client call or a SOAP or REST<BR>
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service binding being called) the kernel uses the appropriate<BR>
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extension to invoke the right methods in the component implementation<BR>
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code.</P>
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<P>The language binding extensions (C++, Ruby, Python, PHP) provide<BR>
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wrapper and proxy code. The wrapper code wraps the component<BR>
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implemented in that language, initialising the component<BR>
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implementation, converting method arguments to the correct types and<BR>
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invoking the defined method with the converted arguments. The proxy<BR>
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code allows the component to call it's references, providing objects<BR>
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that look like standard objects in the component language, but which,<BR>
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when called, convert the method arguments from the language types and<BR>
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invoke the referenced component's wrapper code to invoke the component<BR>
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itself.</P>
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<P>The service and reference binding extensions (SOAP/Axis2C, REST)<BR>
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provide service and reference code. The service code allows Tuscany to<BR>
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run within a container as a service that can be invoked (e.g. as an<BR>
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Axis2C SOAP web service). The reference code allows Tuscany to call<BR>
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other services (that may or may not be other Tuscany services) using<BR>
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that technology to make the call out (e.g. a SOAP call to a Web<BR>
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Service).<BR>
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See the various samples we have for examples of all this.</P>
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</TD></TR></TBODY></TABLE>
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