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<H1><A name="StandaloneSCADomain-StandaloneSCADomain"></A>Standalone SCA Domain</H1>
<P><SPAN class="image-wrap" style="display: block; text-align: center"><IMG src="standalone-sca-domain.data/single-node-abstract.png" style="border: 0px solid black"></SPAN></P>
<H2><A name="StandaloneSCADomain-CreatingAStandaloneDomain"></A>Creating A Standalone Domain</H2>
<P>Using a domain in a single JVM is very easy. You simply create an instance of</P>
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<PRE class="code-java">
org.apache.tuscany.sca.host.embedded.SCADomain.
</PRE>
</DIV></DIV>
<P>Using one of the provided newInstance() methods. Note the package name. You will see a different package name when we look at the multiple JVM case. For now this indicates that the SCA Domain is going to be completely embedded in the Java application that you write. </P>
<P>This is what the different newInstance() operations mean. </P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java">
<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">static</SPAN> SCADomain newInstance()
</PRE>
</DIV></DIV>
<P>Starts a standalone domain with a default domain URI and will treat the classpath as the contribution to this domain. All .composite files on the classpath will be read and any deployable components will be made available in the domain. </P>
<P>Deployable components are defined by either</P>
<P>1 placing the .composite file in the META-INF/sca-deployables/directory<BR>
2 By specifying the composite as deployable in the META-INF/sca-contribution.xml file</P>
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<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">static</SPAN> SCADomain newInstance(<SPAN class="code-object">String</SPAN> composite)
</PRE>
</DIV></DIV>
<P>Starts a standalone domain with a default domain URI and will try and find the named composite file in the classpath and use it's location as the contribution location. It will deploy the named composite. </P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
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<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">static</SPAN> SCADomain newInstance(<SPAN class="code-object">String</SPAN> domainURI, <SPAN class="code-object">String</SPAN> contributionLocation, <SPAN class="code-object">String</SPAN>... composites)
</PRE>
</DIV></DIV>
<P>Will start a standalone domain with the specified domain URI and will load the contribution at the contributionLocation. Any named composites will be deployed. As there are both contributionLocation and composite name parameters there are some rules about what happens when you specifier one the other, both or neither as follows.</P>
<P><B>contributionLocation</B> - an absolute path to a contribution in URL form, e.g </P>
<P> <A href="file://C/mydirA" class="external-link" rel="nofollow">file://C:/mydirA</A> <BR>
jar:<A href="file://C/myjar.jar" class="external-link" rel="nofollow">file://C:/myjar.jar</A> </P>
<P><B>composite(s)</B> - the name of a composite file(s) e.g. </P>
<P> mycomposite.composite <BR>
somedir/mycomposite.composite </P>
<P>So the various combinations give rise to </P>
<P><B>contributionLocation set / composite null</B><BR>
loads all contributions under the contribution location identified </P>
<P><B>contributionLocation null / composite set</B><BR>
finds the location of your compsite on the classpath and uses that as the contribution location. It loads the named composite from there </P>
<P><B>contributionLocation set / composite set</B><BR>
loads the named composite from the specified contribution path </P>
<P><B>contributionLocation null / composite null</B><BR>
This option is also used if the above rules don't identify a contribution URL for whatever reason. </P>
<P> No contribution has been specified so look for the following in order and use the location of the first one found as the contribution location </P>
<P> META-INF/sca-contribution.xml <BR>
META-INF/sca-contribution-generated.xml <BR>
META-INF/sca-deployables directory</P>
<P>For example, in our calculator sample we could do </P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java">
scaDomain = SCADomain.newInstance(<SPAN class="code-quote">"Calculator.composite"</SPAN>);
</PRE>
</DIV></DIV>
<P>Once created the SCA Domain will have loaded a contribution based on the rules set out above. </P>
<P><SPAN class="image-wrap" style="display: block; text-align: center"><IMG src="standalone-sca-domain.data/calculator-standalone.png" style="border: 0px solid black"></SPAN></P>
<H2><A name="StandaloneSCADomain-LocatingServicesInTheDomain"></A>Locating Services In The Domain</H2>
<P>You can now use services in the domain either directly from your Java application or remotely over the service instance that the SCA application exposes. </P>
<P>To use services directly you can use the following SCA Domain interfaces to create a service proxy</P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java">
<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">abstract</SPAN> <B> B getService(<SPAN class="code-object">Class</SPAN><B> businessInterface, <SPAN class="code-object">String</SPAN> serviceName);
</PRE>
</DIV></DIV>
<P>Returns a type safe reference to the named service</P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java">
<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">abstract</SPAN> <B> ServiceReference<B> getServiceReference(<SPAN class="code-object">Class</SPAN><B> businessInterface, <SPAN class="code-object">String</SPAN> referenceName);
</PRE>
</DIV></DIV>
<P>returns an SCA service reference to the named service. You can use the SCA service reference to manipulate various aspects of the referece. </P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java">
<SPAN class="code-keyword">public</SPAN> <SPAN class="code-keyword">abstract</SPAN> <B, R <SPAN class="code-keyword">extends</SPAN> CallableReference<B>> R <SPAN class="code-keyword">cast</SPAN>(B target) <SPAN class="code-keyword">throws</SPAN> IllegalArgumentException;
</PRE>
</DIV></DIV>
<P>Casts a service (callable) reference to a typesafe reference . </P>
<P>For example, in our calculator sample we could do</P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java">
calculatorService = scaDomain.getService(CalculatorService.class, <SPAN class="code-quote">"CalculatorServiceComponent"</SPAN>);
</PRE>
</DIV></DIV>
<P>Once you have a service proxy you can call methods on it like any other Java object. </P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java">
<SPAN class="code-object">Double</SPAN> result = calculatorService.add(3, 2)
</PRE>
</DIV></DIV>
<H2><A name="StandaloneSCADomain-ClosingTheDomain"></A>Closing The Domain</H2>
<P>When you a finished with the domain you need to close it down.</P>
<DIV class="code panel" style="border-width: 1px;"><DIV class="codeContent panelContent">
<PRE class="code-java">
scaDomain.close();
</PRE>
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