Andrew Borley wrote:
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
Andy,
Looks great! I can help integrate in the automake build.
--
Jean-Sebastien
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