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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.ruby;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import org.jruby.IRuby;
import org.jruby.RubyException;
import net.sf.cglib.asm.ClassWriter;
import net.sf.cglib.asm.CodeVisitor;
import net.sf.cglib.asm.Constants;
import net.sf.cglib.asm.Type;
/**
* This is a proxy that will mediate reference calls from the JavaScript. The mediation code here will be reviewed when the DataMediation
* infrastructure is ready. This proxy assmes that there is no verloading of service methods on the reference interface i.e. there are no two service
* methods that have the same method name or operation name.
*/
public class RubyReferenceProxy {
private Class interfaze;
private Object wireProxy;
private IRuby rubyEngine;
public RubyReferenceProxy(Class interfaze, Object wireProxy, IRuby rubyEng) {
this.interfaze = interfaze;
this.wireProxy = wireProxy;
this.rubyEngine = rubyEng;
}
public Object createProxy() {
try {
GenericProxyClassLoader classloader = new GenericProxyClassLoader();
final byte[] byteCode = generateGenericInterface(interfaze);
Class genericInterface = classloader.defineClass(byteCode);
InvocationHandler proxyHandler = new RubyRefInvocInterceptor(wireProxy, interfaze, rubyEngine);
// return genericInterface.cast(Proxy.newProxyInstance(classloader, new Class[]{genericInterface}, proxyHandler));
return Proxy.newProxyInstance(classloader,
new Class[]{genericInterface},
proxyHandler);
} catch (Exception e) {
return null;
}
}
private static byte[] generateGenericInterface(Class serviceInterface) {
String interfazeName = serviceInterface.getCanonicalName();
ClassWriter cw = new ClassWriter(false);
cw.visit(Constants.V1_5,
Constants.ACC_PUBLIC + Constants.ACC_ABSTRACT + Constants.ACC_INTERFACE,
interfazeName.replace('.',
'/'),
"java/lang/Object",
null,
serviceInterface.getSimpleName() + ".java");
StringBuffer argsAndReturn = new StringBuffer("(");
Method[] methods = serviceInterface.getMethods();
for (int count = 0; count < methods.length; ++count) {
argsAndReturn = new StringBuffer("(");
Class[] paramTypes = methods[count].getParameterTypes();
Class returnType = methods[count].getReturnType();
for (int paramCount = 0; paramCount < paramTypes.length; ++paramCount) {
argsAndReturn.append(Type.getType(Object.class));
}
argsAndReturn.append(")");
argsAndReturn.append(Type.getType(Object.class));
Class[] exceptionTypes = methods[count].getExceptionTypes();
String[] exceptions = new String[exceptionTypes.length];
for (int excCount = 0; excCount < exceptionTypes.length; ++excCount) {
exceptions[excCount] = exceptionTypes[excCount].getName();
exceptions[excCount] = exceptions[excCount].replace('.',
'/');
}
CodeVisitor cv = cw.visitMethod(Constants.ACC_PUBLIC + Constants.ACC_ABSTRACT,
methods[count].getName(),
argsAndReturn.toString(),
exceptions,
null);
cw.visitEnd();
}
cw.visitEnd();
return cw.toByteArray();
}
private class GenericProxyClassLoader extends ClassLoader {
public Class defineClass(byte[] byteArray) {
try {
return defineClass(null,
byteArray,
0,
byteArray.length);
} catch (Throwable e) {
return null;
}
}
}
}
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