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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.container.rhino;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.tuscany.container.easy.EasyInstanceFactory;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextFactory;
import org.mozilla.javascript.ImporterTopLevel;
import org.mozilla.javascript.Script;
import org.mozilla.javascript.Scriptable;
/**
* A RhinoScript represents a compiled JavaScript script
*/
public class RhinoScriptInstanceFactory extends EasyInstanceFactory<RhinoScriptInstance> {
protected String scriptSource;
protected Scriptable scriptScope;
protected Map<String, Class> responseClasses;
private String className;
/*
* Enable dynamic scopes so a script can be used concurrently with a global shared scope and individual execution scopes. See
* http://www.mozilla.org/rhino/scopes.html
*/
private static class MyFactory extends ContextFactory {
protected boolean hasFeature(Context cx, int featureIndex) {
if (featureIndex == Context.FEATURE_DYNAMIC_SCOPE) {
return true;
}
return super.hasFeature(cx, featureIndex);
}
}
static {
ContextFactory.initGlobal(new MyFactory());
}
public RhinoScriptInstanceFactory(String resourceName, String className, String scriptSource, ClassLoader classLoader) {
super(resourceName, classLoader);
this.className = className;
this.scriptSource = scriptSource;
this.responseClasses = new HashMap<String, Class>();
initScriptScope(resourceName, scriptSource, null, classLoader);
}
@Override
public RhinoScriptInstance createInstance(List<Class> services, Map<String, Object> context) {
// TODO services should really be on the constructor of this class, not on this method
// and the responseClasses done in the constructor/init
Scriptable instanceScope = createInstanceScope(context);
RhinoScriptInstance rsi = new RhinoScriptInstance(scriptScope, instanceScope, context, getResponseClasses(services));
return rsi;
}
/**
* Initialize the Rhino Scope for this script instance
*/
public Scriptable createInstanceScope(Map<String, Object> context) {
Context cx = Context.enter();
try {
Scriptable instanceScope = cx.newObject(scriptScope);
instanceScope.setPrototype(scriptScope);
instanceScope.setParentScope(null);
addContexts(instanceScope, context);
return instanceScope;
} finally {
Context.exit();
}
}
/**
* Create a Rhino scope and compile the script into it
*/
public void initScriptScope(String fileName, String scriptCode, Map context, ClassLoader cl) {
Context cx = Context.enter();
try {
if (cl != null) {
// TODO: broken with the way the tuscany launcher now uses class loaders
// cx.setApplicationClassLoader(cl);
}
this.scriptScope = new ImporterTopLevel(cx, true);
Script compiledScript = cx.compileString(scriptCode, fileName, 1, null);
compiledScript.exec(cx, scriptScope);
addContexts(scriptScope, context);
} finally {
Context.exit();
}
}
/**
* Add the context to the scope. This will make the objects available to a script by using the name it was added with.
*/
protected void addContexts(Scriptable scope, Map contexts) {
if (contexts != null) {
for (Iterator i = contexts.keySet().iterator(); i.hasNext();) {
String name = (String) i.next();
Object value = contexts.get(name);
if (value != null) {
scope.put(name, scope, Context.toObject(value, scope));
}
}
}
}
/**
* Set the Java type of a response value. JavaScript is dynamically typed so Rhino cannot always work out what the intended Java type of a
* response should be, for example should the statement "return 42" be a Java int, or Integer or Double etc. When Rhino can't determine the type
* it will default to returning a String, using this method enables overriding the Rhino default to use a specific Java type.
*/
public void setResponseClass(String functionName, Class responseClasses) {
this.responseClasses.put(functionName, responseClasses);
}
}
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