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<H1><A name="ArchitectureGuide-HighlevelarchitectureviewofSCANative"></A>High level architecture view of SCA Native</H1>
<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>
<P>The kernel loads any .composite, .xsd, .wsdl or<BR>
.componentType files found under a directory defined by the<BR>
TUSCANY_SCACPP_ROOT environment variable. The kernel also loads any<BR>
extensions found in the Tuscany extensions directory (found in the<BR>
directory specified by the TUSCANY_SCACPP env variable). The kernel<BR>
inspects the .composite files and checks that any required extensions<BR>
that the SCA app uses are loaded, works out how the components are<BR>
wired together, and then passes the details of the composite to the<BR>
appropriate extensions. E.g. if the SCDL contains a<BR>
<implementation.python> element, the contents of that element are<BR>
passed to the Python extension which will load a defined script, etc.<BR>
When the SCA app is invoked (via a local client call or a SOAP or REST<BR>
service binding being called) the kernel uses the appropriate<BR>
extension to invoke the right methods in the component implementation<BR>
code.</P>
<P>The language binding extensions (C++, Ruby, Python, PHP) provide<BR>
wrapper and proxy code. The wrapper code wraps the component<BR>
implemented in that language, initialising the component<BR>
implementation, converting method arguments to the correct types and<BR>
invoking the defined method with the converted arguments. The proxy<BR>
code allows the component to call it's references, providing objects<BR>
that look like standard objects in the component language, but which,<BR>
when called, convert the method arguments from the language types and<BR>
invoke the referenced component's wrapper code to invoke the component<BR>
itself.</P>
<P>The service and reference binding extensions (SOAP/Axis2C, REST)<BR>
provide service and reference code. The service code allows Tuscany to<BR>
run within a container as a service that can be invoked (e.g. as an<BR>
Axis2C SOAP web service). The reference code allows Tuscany to call<BR>
other services (that may or may not be other Tuscany services) using<BR>
that technology to make the call out (e.g. a SOAP call to a Web<BR>
Service).<BR>
See the various samples we have for examples of all this.</P>
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