Hi all, I've just checked in code to support SCA clients written in Python and references in Python components.
The updated PythonCalculator sample under http://svn.apache.org/repos/asf/incubator/tuscany/cpp/sca/samples/PythonCalculator<http://svn.apache.org/repos/asf/incubator/tuscany/cpp/sca/samples/RubyCalculator/sample.calculator/> shows the programming model: - A client can get a proxy to a service with: import TuscanySCA and calculator = TuscanySCA.locateService ("CalculatorComponent/CalculatorService") - You then simply call a business method on "calculator", like this: x = calculator.add(1, 2) - References are automatically added to your Python component implementation when the runtime loads the implementation script, so they can be used like so: # The module-level div function def div(val1, val2): # Use the divideService reference result = divideService.divide(val1, val2) return result and in your composite file: <component name="CalculatorComponent"> <implementation.python module="CalculatorImpl" scope="composite"/> <reference name="divideService">DivideComponent/DivideService</reference> </component> - Due to the current requirement of a componentType file, I have implemented an empty interface.python interface extension (rather than expecting people to use interface.cpp or something. So a .componentType file would look like: <componentType xmlns="http://www.osoa.org/xmlns/sca/1.0";> <service name="CalculatorService"> <interface.python/> </service> <reference name="divideService"> <interface.python/> </reference> </componentType> - The client and reference support comes from a Python extension package that is installed into the Python environment, making the TuscanySCA and TuscanySCAProxy modules available for all python scripts. - Next up is properties support - this should be pretty easy. - Further work would be to look at annotations, to avoid the need for the .componentType files at all. The code for the Tuscany/C++ Python extension is here: http://svn.apache.org/repos/asf/incubator/tuscany/cpp/sca/runtime/extensions/python<http://svn.apache.org/repos/asf/incubator/tuscany/cpp/sca/runtime/extensions/ruby/> It builds and runs fine on Windows (remember to have the PYTHON_HOME env variable set to your Python insallation dir), but hasn't been tested or built on Linux. I have updated the automake files but I don't know how to add in the commands to build and install the Python extension into Python. The commands required are: cd tuscany/cpp/sca/runtime/extensions/python/src/tuscany/sca/python python TuscanySCASetup.py build python TuscanySCASetup.py install If someone who knows automake could add these in and test it out that would be great! Cheers Andy
