/*
* 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.tuscany.implementation.spi.PropertyValueObjectFactory;
import org.apache.tuscany.sca.assembly.ComponentReference;
import org.apache.tuscany.sca.assembly.Property;
import org.apache.tuscany.sca.assembly.Reference;
import org.apache.tuscany.sca.factory.ObjectCreationException;
import org.apache.tuscany.sca.factory.ObjectFactory;
import org.apache.tuscany.sca.implementation.script.engines.TuscanyJRubyScriptEngine;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
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;
/**
* Represents a Script implementation.
*/
public class ScriptImplementationProvider implements ImplementationProvider {
protected RuntimeComponent component;
protected ScriptImplementation implementation;
protected ScriptEngine scriptEngine;
protected PropertyValueObjectFactory propertyFactory;
public ScriptImplementationProvider(RuntimeComponent component, ScriptImplementation implementation, PropertyValueObjectFactory propertyFactory) {
this.component = component;
this.implementation = implementation;
this.propertyFactory = propertyFactory;
}
public Invoker createInvoker(RuntimeComponentService service, Operation operation) {
return new ScriptInvoker(this, operation.getName());
}
public Invoker createCallbackInvoker(Operation operation) {
return new ScriptInvoker(this, operation.getName());
}
public void start() {
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 : implementation.getReferences()) {
scriptEngine.put(reference.getName(), createReferenceProxy(reference.getName(), component));
}
for (Property property : implementation.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);
}
}
public void stop() {
}
@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.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
*/
private ScriptEngine getScriptEngineByExtension(String scriptExtn) {
ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
if ("rb".equals(scriptExtn)) {
return new TuscanyJRubyScriptEngine();
} else {
return scriptEngineManager.getEngineByExtension(scriptExtn);
}
}
}