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<H3><A name="JavaSCAimplementation.script-%3Cimplementation.script%3E"></A><implementation.script></H3>
<P>The Tuscany Java SCA runtime supports implementing SCA components in a wide variety of dynamic or scripting languages by using the <implementation.script> SCDL extension.</P>
<P>Any language that supports the "Scripting for Java" APIs defined by JSR-223 is supported, this includes Groovy, JavaScript, JRuby, Jython, and many others.</P>
<P>To use these languages the SCA assembly SCDL is extended with an "implementation.script" element which has the following options:</P>
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<PRE class="code-java"><implementation.script [ script=<SPAN class="code-quote">"" | language="</SPAN>" ] >
[inline src]
</implementation.script></PRE>
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<P>The source code for the script maybe defined in a seperate file pointed to by the 'script=' attribute, or the source code maybe embedded within the SCDL inline inside the <implementation.script> element.</P>
<P>The 'language=' attribute defines the language of the program. The language attribute is optional when the source code is in a separate file in which case the file extension of the file is used to determine the language.</P>
<H4><A name="JavaSCAimplementation.script-Someexamples%3A"></A>Some examples:</H4>
<P>A Ruby program defined in a file 'myScript.rb' in a folder named 'test':</P>
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<PRE class="code-java"><implementation.script script=<SPAN class="code-quote">"test/myScript.rb"</SPAN>/></PRE>
</DIV></DIV>
<P>A JavaScript program defined inline:</P>
<DIV class="code"><DIV class="codeContent">
<PRE class="code-java"><implementation.script language=<SPAN class="code-quote">"js"</SPAN>>
function sayHello(name) {
<SPAN class="code-keyword">return</SPAN> <SPAN class="code-quote">"Hello "</SPAN> + name;
}
</implementation.script></PRE>
</DIV></DIV>
<P>When using inline scripts which contain special characters such as XML markup you may need to enclose the source within a CDATA region, for example:</P>
<DIV class="code"><DIV class="codeContent">
<PRE class="code-java"><implementation.script language=<SPAN class="code-quote">"js"</SPAN>><![CDATA[
function sayHello(inXML) {
<SPAN class="code-keyword">return</SPAN> <sayHelloResponse>Hello { inXML..name }</sayHelloResponse>;
}
]]></implementation.script></PRE>
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<P>The previous example demonstrated using JavaScript's <SPAN class="nobr"><A href="http://www.ecma-international.org/publications/standards/Ecma-357.htm" title="Visit page outside Confluence" rel="nofollow">E4X<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> language extension for manipulating XML. Many dynamic languages have enhanced XML capabilities like this which can make working with XML much easier than in a more traditional language such as Java. For example, along with JavaScript's E4X, Ruby has ReXML and Groovy has its markup builders. </P>
<P>Tuscany tries to simplify this for the script program developer and will try to automatically ensure arguments are in the native XML format of the language when the component is wired to a WSDL interface. </P>
<P>As an example of this the following shows a composite that can replace the Tuscany helloworld-ws-service sample and requires no other files other than the asscociated WSDL document packaged with the contribution:</P>
<DIV class="code"><DIV class="codeContent">
<PRE class="code-java"><composite xmlns=<SPAN class="code-quote">"http:<SPAN class="code-comment">//www.osoa.org/xmlns/sca/1.0"</SPAN>
</SPAN> targetNamespace=<SPAN class="code-quote">"http:<SPAN class="code-comment">//helloworld"</SPAN>
</SPAN> xmlns:hw=<SPAN class="code-quote">"http:<SPAN class="code-comment">//helloworld"</SPAN>
</SPAN> name=<SPAN class="code-quote">"helloworldws"</SPAN>>
<service name=<SPAN class="code-quote">"HelloWorldService"</SPAN> promote=<SPAN class="code-quote">"HelloWorldServiceComponent"</SPAN>>
<<SPAN class="code-keyword">interface</SPAN>.wsdl <SPAN class="code-keyword">interface</SPAN>=<SPAN class="code-quote">"http:<SPAN class="code-comment">//helloworld#wsdl.<SPAN class="code-keyword">interface</SPAN>(HelloWorld)"</SPAN> />
</SPAN> <binding.ws uri=""/>
</service>
<component name=<SPAN class="code-quote">"HelloWorldServiceComponent"</SPAN>>
<implementation.script language=<SPAN class="code-quote">"js"</SPAN>><![CDATA[
function getGreetings(xmlIn) {
<SPAN class="code-keyword">return</SPAN> <ns1:getGreetings xmlns:ns1=<SPAN class="code-quote">"http:<SPAN class="code-comment">//helloworld"</SPAN>>
</SPAN> <ns1:name>Hello { xmlIn..name }</ns1:name>
</ns1:getGreetings>
}
]]></implementation.script>
</component>
</composite></PRE>
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<TABLE cellpadding="5" width="85%" cellspacing="8px" class="noteMacro" border="0" align="center"><COLGROUP><COL width="24"><COL></COLGROUP><TR><TD valign="top"><IMG src="http://cwiki.apache.org/confluence/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></TD><TD><B class="strong">Best practice?</B><BR>
<P>Using inline scripts can make creating simple components very easier however there are issues around whether or not this is good practice. <BR>
Depending on the circumstance consideration should be given as to if it would be better to define the script in a seperate file.</P></TD></TR></TABLE>
<TABLE cellpadding="5" width="85%" cellspacing="8px" class="noteMacro" border="0" align="center"><COLGROUP><COL width="24"><COL></COLGROUP><TR><TD valign="top"><IMG src="http://cwiki.apache.org/confluence/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></TD><TD><B class="strong">0.90</B><BR>
<P>In release 0.90 and before, inline scripts are not supported and scripts require an associated .componentType side file</P></TD></TR></TABLE>
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