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- <TITLE>Tuscany SCA Native - Ruby Extension</TITLE>
-</HEAD>
-
-<BODY>
-<DIV ID="bodyColumn">
- <DIV ID="contentBox">
- <DIV CLASS="section">
- <H1>Tuscany SCA Native - Ruby Extension</H1>
-
- <P>The Tuscany Ruby extension allows Ruby scripts to be used as components in
- SCA composites and as clients that can invoke SCA services.
- </P>
- <P>The following samples demonstrate use of the Ruby extension:</P>
- <UL>
- <LI><A HREF="../samples/RubyCalculator/README.html">RubyCalculator</A></LI>
- <LI><A HREF="../samples/RubyBigBank/README.html">RubyBigBank</A></LI>
- <LI><A HREF="../samples/RestCalculator/README.html">RestCalculator</A></LI>
- <LI><A HREF="../samples/RestYahoo/README.html">RestYahoo</A></LI>
- <LI><A HREF="../samples/HTTPDBigBank/README.html">HTTPDBigBank</A></LI>
- </UL>
- </DIV>
- <DIV CLASS="section">
- <H2>Contents</H2>
- <OL>
- <LI><A HREF="#requirements">System Requirements</A></LI>
- <LI><A HREF="#install">Installing the Tuscany SCA Ruby Extension..</A>
- <UL>
- <LI><A HREF="#linuxbin">..from the binary release on Linux and Mac OS X</A></LI>
- <LI><A HREF="#linuxsrc">..from the source release on Linux and Mac OS X</A></LI>
- <LI><A HREF="#winbin">..from the binary release on Windows</A></LI>
- <LI><A HREF="#winsrc">..from the source release on Windows</A></LI>
- </UL></LI>
- <LI><A HREF="#pm">The Tuscany Ruby Programming Model</A></LI>
- <UL>
- <LI><A HREF="#clients">Clients</A></LI>
- <LI><A HREF="#components">SCA Components</A></LI>
- <LI><A HREF="#references">Component references</A></LI>
- <LI><A HREF="#properties">Component properties</A></LI>
- </UL>
- <LI><A HREF="#help">Getting help</A></LI>
- </OL>
- </DIV>
- <DIV CLASS="section">
- <A NAME="requirements"><H2>System Requirements</H2></A>
-
- <P>In order to install and use the Tuscany SCA Ruby Extension there are some
- extra requirements in addition to the <A HREF="../GettingStarted.html#requirements">Tuscany
- SCA requirements</A>:</P>
- <TABLE CLASS="bodyTable">
-
- <TBODY>
- <TR CLASS="a">
- <TD><B>Software</B></TD>
- <TD><B>Download Link</B></TD>
- </TR>
- <TR CLASS="b">
- <TD>Ruby version 1.8.x</TD>
-
- <TD>
- <A HREF="http://www.ruby-lang.org"
- TARGET="_blank">http://www.ruby-lang.org</A><BR/>
- Please download and follow the installation instructions. You should
- be able to build the Tuscany SCA Ruby Extension with other versions of Ruby.
- The extension has been tested with the
- <A HREF="http://rubyforge.org/frs/download.php/12751/ruby185-21.exe">Ruby 1.8.5 One-Click Installer</A>
- on Windows and the <A HREF="ftp://ftp.ruby-lang.org/pub/ruby/ruby-1.8.5-p12.tar.gz">1.8.5 source code</A>
- (compiled locally) on Linux.
- </TD>
- </TR>
- </TBODY>
- </TABLE>
- </DIV>
-
- <DIV CLASS="section">
- <A NAME="install"><H2>Installing the Tuscany SCA Ruby Extension</H2></A>
- <A NAME="linuxbin"><H3>Getting the Tuscany SCA Ruby Extension working with the binary release on Linux and Mac OS X</H3></A>
- <OL>
- <LI>Ensure the Ruby libraries are available on the PATH environment variable</LI>
- </OL>
- <A NAME="linuxsrc"><H3>Getting the Tuscany SCA Ruby Extension working with the source release on Linux and Mac OS X</H3></A>
- <OL>
- <LI>You will need the Tuscany SCA and SDO libraries - follow the instructions
- <A HREF="../GettingStarted.html">here</A> to build the SCA libraries and default extensions</LI>
- <LI>The following environment variables are required:
- <UL>
- <LI>TUSCANY_SCACPP=&lt;path to built Tuscany SCA&gt;
- <LI>TUSCANY_SDOCPP=&lt;path to installed Tuscany SDO&gt;
- <LI>RUBY_LIB=&lt;path to Ruby libraries&gt;</LI>
- <LI>RUBY_INCLUDE=&lt;path to Ruby includes&gt;<BR/>
- Note: If you are using a default installation of Ruby these are usually:<BR/>
- RUBY_LIB=/usr/lib<BR/>
- RUBY_INCLUDE=/usr/lib/ruby/1.8/i386-linux</LI>
- </UL></LI>
- <LI>Build the Ruby source only with the following command sequence:
- <UL>
- <LI>cd &lt;tuscany_sca_install_dir&gt;</LI>
- <LI>./configure --prefix=$TUSCANY_SCACPP --enable-ruby --enable-cpp=no --enable-wsbinding=no</LI>
- <LI>make</LI>
- <LI>make install</LI>
- </UL>
- NOTE: If you don't provide a --prefix configure option, it will by default install into
- /usr/local/tuscany/sca</LI>
- </OL>
-
- <A NAME="winbin"><H3>Getting the Tuscany SCA Ruby Extension working with the binary release on Windows</H3></A>
- <OL>
- <LI>Ensure the Ruby libraries are available on the PATH environment variable</LI>
- </OL>
- <A NAME="winsrc"><H3>Getting the Tuscany SCA Ruby Extension working with the source release on Windows</H3></A>
- <OL>
- <LI>Unzip the supplied source zip file</LI>
- <LI>The following environment variables are required:
- <UL>
- <LI>TUSCANY_SCACPP=&lt;path to built Tuscany SCA&gt;
- <LI>TUSCANY_SDOCPP=&lt;path to installed Tuscany SDO&gt;
- <LI>RUBY_HOME=&lt;path to installed Ruby&gt;
- </UL></LI>
- <LI>You must have set up the environment for Microsoft Visual C++ tools. The build command
- will call vcvars32 to set the environment. Ensure the directory containing this is on your path.
- This will be where you installed the compiler.</LI>
- <LI>Build the source:
- <UL>
- <LI>cd &lt;to where you unzipped the source&gt;</LI>
- <LI>build</LI>
- </UL>
- This will build all the projects and put the required output into the 'deploy' directory<BR/><BR/>
- Alternatively, open the workspace at &lt;tuscany_sca_install_dir&gt;/projects/tuscany_sca/tuscany_sca.dsw
- in Visual Studio 6 or at at &lt;tuscany_sca_install_dir&gt;/projectsvc7/tuscany_sca/tuscany_sca.sln
- in Visual Studio 7.1 - you can build projects individually
- or build the samples to rebuild all the projects</LI>
- </OL>
- </DIV>
-
-
- <DIV CLASS="section">
- <A NAME="pm"><H2>The Tuscany Ruby Programming Model</H2></A>
- <P>This section will explain the Tuscany Ruby programming model to help you to
- write your own Ruby components and clients.
- </P>
- <P>The Tuscany Ruby component and client support comes from a Ruby extension
- library that is built in the &lt;tuscany_sca_install_dir&gt;/extensions/ruby/bin
- directory on Windows and &lt;tuscany_sca_install_dir&gt;/extensions/ruby/lib on
- Linux and Mac OS X.
- </P>
- <A NAME="clients"><H3>Clients</H3></A>
- <P>Using the Ruby SCA extension library, a Ruby client can search for an SCA service with:
- </P>
-<PRE>require("libtuscany_sca_ruby")
-
-calculator = SCA::locateService("CalculatorComponent/CalculatorService")
-</PRE>
- <P>This finds the component and service as defined in the composite and componentType
- side files and returns a proxy object that can call the SCA service. You can then
- simply call a business method on "calculator", like this:
- </P>
-<PRE>result = calculator.add(12.3, 45.6)</PRE>
- </P>
- <A NAME="components"><H3>Components</H3></A>
- <P>Ruby component implementations are standard Ruby scripts, where class-level
- functions or module-level functions can be invoked by the Tuscany runtime. To
- use a Ruby component implementation, use the implementation.ruby element in
- your .composite file. For example:
- </P>
-<PRE>&lt;implementation.ruby script="CalculatorImpl.rb"/&gt;
-</PRE>
- <P>To instantiate a class instance and use a class-level function, the Ruby class must
- have a default constructor (an initialize() method that takes no arguments) and the
- class attribute must be definde in the implementation.ruby element
- in your composite, like so:
- </P>
-<PRE>&lt;implementation.ruby script="CalculatorImpl.rb" class="CalculatorImpl"/&gt;
-</PRE>
- <P>Tuscany currently supports passing simple types (strings, ints, floats, etc) as well
- as Service Data Objects into and out of Ruby components. Service Data Objects are represented
- in Ruby as REXML Document objects (see the <A HREF="../samples/RubyBigBank/README.html">
- Ruby BigBank sample</A> for a demonstration).
- </P>
- <P>You can write a componentType file for your Ruby component, but you don't have to - the Ruby
- extension introspects Ruby component implementation classes for you and binds public
- attributes to references and properties.
- </P>
- <A NAME="references"><H3>References</H3></A>
- <P>References can be invoked from Ruby component implementations by the use of public
- attributes in the component implementation classes, like this:
- </P>
-<PRE>class CalculatorImpl
-
- # Define the public attribute that corresponds to the divideService reference
- attr_writer :divideService
-
-...
-
- def div(arg1, arg2)
- print "Ruby - CalculatorImpl.div\n"
- # Invoke the divideService reference
- @divideService.divide(arg1.to_f, arg2.to_f)
- end
-
-...
-end
-</PRE>
- <P>and in your composite file:
- </P>
-<PRE>&lt;component name="CalculatorComponent"&gt;
- &lt;implementation.ruby script="CalculatorImpl.rb"/&gt;
- &lt;reference name="divideService"&gt;DivideComponent/DivideService&lt;/reference&gt;
-&lt;/component&gt;
-</PRE>
- <A NAME="properties"><H3>Properties</H3></A>
- <P>A composite with a property defined for a component like so:
- </P>
-<PRE>&lt;component name="DivideComponent"&gt;
- &lt;implementation.ruby script="DivideImpl.rb" class="DivideImpl"/&gt;
- &lt;property name="round"&gt;true&lt;/property&gt;
-&lt;/component&gt;
-</PRE>
- <P>allows a public attribute of a Ruby component implementation class to be
- assigned the property value, so it can be used like so:
- </P>
-<PRE>class DivideImpl
-
- # Define the public attribute that corresponds to the round property
- attr_writer :round
-
-...
-
- def divide(arg1, arg2)
- print "Ruby - DivideImpl.divide ", arg1, " / ", arg2, "\n"
- res = arg1.to_f / arg2.to_f
- # Use the round property
- if @round then
- res = res.round
- print "DivideImpl.divide rounding\n"
- end
- print "DivideImpl.divide ", res, "\n"
- res
- end
-end
-</PRE>
-</P>
- </DIV>
-
- <DIV CLASS="section">
- <A NAME="help"><H2>Getting Help</H2></A>
-
- <P>First place to look is at the Tuscany FAQ at
- <A HREF="http://incubator.apache.org/tuscany/faq.html"
- TARGET="_blank">http://incubator.apache.org/tuscany/faq.html</A> </P>
-
- <P>Any problem with this release can be reported to the Tuscany
- <A HREF="http://incubator.apache.org/tuscany/mail-lists.html"
- TARGET="_blank">mailing lists</A> or create a JIRA issue at&nbsp;<A HREF="http://issues.apache.org/jira/browse/Tuscany"
- TARGET="_blank">http://issues.apache.org/jira/browse/Tuscany</A>.</P>
- </DIV>
- </DIV>
-</DIV>
-</BODY>
-
-</HTML>
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