/*
* 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.script;
import java.io.StringReader;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import org.apache.axiom.om.OMElement;
import org.apache.bsf.xml.XMLHelper;
import org.apache.tuscany.sca.assembly.ComponentReference;
import org.apache.tuscany.sca.assembly.ComponentType;
import org.apache.tuscany.sca.assembly.Property;
import org.apache.tuscany.sca.assembly.Reference;
import org.apache.tuscany.sca.assembly.Service;
import org.apache.tuscany.sca.core.factory.ObjectCreationException;
import org.apache.tuscany.sca.core.factory.ObjectFactory;
import org.apache.tuscany.sca.extension.helper.InvokerFactory;
import org.apache.tuscany.sca.extension.helper.utils.PropertyValueObjectFactory;
import org.apache.tuscany.sca.implementation.script.engines.TuscanyJRubyScriptEngine;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
import org.apache.tuscany.sca.interfacedef.wsdl.WSDLInterfaceContract;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
public class ScriptInvokerFactory implements InvokerFactory {
protected ScriptEngine scriptEngine;
protected XMLHelper xmlHelper;
protected RuntimeComponent rc;
protected ComponentType ct;
protected ScriptImplementation implementation;
protected PropertyValueObjectFactory propertyFactory;
/**
* @param rc
* @param ct
* @param implementation
* @param propertyFactory
*/
public ScriptInvokerFactory(RuntimeComponent rc,
ComponentType ct,
ScriptImplementation implementation,
PropertyValueObjectFactory propertyFactory) {
super();
this.rc = rc;
this.ct = ct;
this.implementation = implementation;
this.propertyFactory = propertyFactory;
}
public Invoker createInvoker(Operation operation) {
init(rc, ct, implementation, propertyFactory);
return new ScriptInvoker(scriptEngine, xmlHelper, operation);
}
protected synchronized void init(RuntimeComponent rc, ComponentType ct, ScriptImplementation implementation, PropertyValueObjectFactory propertyFactory) {
if(scriptEngine!=null) {
return;
}
try {
scriptEngine = getScriptEngineByExtension(implementation.getScriptLanguage());
if (scriptEngine == null) {
throw new ObjectCreationException("no script engine found for language: " + implementation.getScriptLanguage());
}
if (!(scriptEngine instanceof Invocable)) {
throw new ObjectCreationException("script engine does not support Invocable: " + scriptEngine);
}
for (Reference reference : ct.getReferences()) {
scriptEngine.put(reference.getName(), createReferenceProxy(reference.getName(), rc));
}
for (Property property : ct.getProperties()) {
ObjectFactory<?> propertyValueFactory = propertyFactory.createValueFactory(property);
if ( propertyValueFactory != null) {
scriptEngine.put(property.getName(), propertyValueFactory.getInstance());
}
}
scriptEngine.eval(new StringReader(implementation.getScriptSrc()));
} catch (ScriptException e) {
throw new ObjectCreationException(e);
}
// set the databinding and xmlhelper for wsdl interfaces
for (Service service : rc.getServices()) {
InterfaceContract ic = service.getInterfaceContract();
if (ic instanceof WSDLInterfaceContract) {
// Set to use the Axiom data binding
ic.getInterface().resetDataBinding(OMElement.class.getName());
xmlHelper = XMLHelper.getArgHelper(scriptEngine);
}
}
}
/**
* TODO: RuntimeComponent should provide a method like this
*/
@SuppressWarnings("unchecked")
protected Object createReferenceProxy(String name, RuntimeComponent component) {
for (ComponentReference reference : component.getReferences()) {
if (reference.getName().equals(name)) {
Class iface = ((JavaInterface)reference.getInterfaceContract().getInterface()).getJavaClass();
return component.getComponentContext().getService(iface, name);
}
}
throw new IllegalArgumentException("reference " + name + " not found on component: " + component);
}
/**
* Hack for now to work around a problem with the JRuby script engine
*/
protected ScriptEngine getScriptEngineByExtension(String scriptExtn) {
ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
if ("rb".equals(scriptExtn)) {
return new TuscanyJRubyScriptEngine();
} else {
return scriptEngineManager.getEngineByExtension(scriptExtn);
}
}
}