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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.implementation.python.provider;
import java.util.ArrayList;
import java.util.List;
import org.apache.tuscany.sca.assembly.ComponentProperty;
import org.apache.tuscany.sca.assembly.ComponentReference;
import org.apache.tuscany.sca.core.invocation.ProxyFactory;
import org.apache.tuscany.sca.implementation.python.PythonEval;
import org.apache.tuscany.sca.implementation.python.PythonImplementation;
import org.apache.tuscany.sca.implementation.python.PythonProperty;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.provider.ImplementationProvider;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
import org.apache.tuscany.sca.runtime.RuntimeEndpointReference;
import org.python.core.Py;
import org.python.core.PyObject;
import org.python.core.PyString;
import org.python.core.PySystemState;
import org.python.core.PyTuple;
import org.python.util.PythonInterpreter;
/**
* Implementation provider for Python component implementations.
*
* @version $Rev$ $Date$
*/
class PythonImplementationProvider implements ImplementationProvider {
final RuntimeComponent component;
final PythonImplementation implementation;
PythonInterpreter python;
PyObject callable;
ProxyFactory pxFactory;
PythonImplementationProvider(final RuntimeComponent comp, final PythonImplementation impl, ProxyFactory pxf) {
component = comp;
implementation = impl;
pxFactory = pxf;
}
public void start() {
final PySystemState pss = new PySystemState();
pss.path.insert(0, new PyString(implementation.getLocation()));
pss.path.insert(0, new PyString(getClass().getProtectionDomain().getCodeSource().getLocation().getFile()));
python = new PythonInterpreter(null, pss);
python.exec("from invoker import *");
final List<PyObject> px = new ArrayList<PyObject>();
for(final ComponentReference r: component.getReferences()) {
final PythonEval pe = pxFactory.createProxy(PythonEval.class, (RuntimeEndpointReference)r.getEndpointReferences().get(0));
px.add(Py.java2py(new PythonEval() {
@Override
public String eval(final String args) throws Exception {
final String v = pe.eval(args);
return v;
}
}));
}
final List<PyObject> pr = new ArrayList<PyObject>();
for(final ComponentProperty p: component.getProperties()) {
final String v = String.valueOf(p.getValue());
pr.add(Py.java2py(new PythonProperty() {
@Override
public String eval() {
return v;
}
}));
}
PyObject mkc = python.get("mkcomponent");
callable = mkc.__call__(new PyString(component.getName()), new PyString(implementation.getScript()), new PyTuple(px.toArray(new PyObject[0])), new PyTuple(pr.toArray(new PyObject[0])));
}
public void stop() {
python.cleanup();
}
public boolean supportsOneWayInvocation() {
return false;
}
public Invoker createInvoker(final RuntimeComponentService s, final Operation op) {
return new PythonInvoker(python, callable, op);
}
}
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