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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.binding.rmi.provider;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.rmi.Remote;
import java.rmi.server.UnicastRemoteObject;
import java.security.AccessController;
import java.security.PrivilegedExceptionAction;
import net.sf.cglib.asm.ClassWriter;
import net.sf.cglib.asm.Type;
import net.sf.cglib.core.Constants;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import org.apache.tuscany.sca.binding.rmi.RMIBinding;
import org.apache.tuscany.sca.host.rmi.RMIHost;
import org.apache.tuscany.sca.host.rmi.RMIHostException;
import org.apache.tuscany.sca.interfacedef.Interface;
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.java.impl.JavaInterfaceUtil;
import org.apache.tuscany.sca.provider.ServiceBindingProvider;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
import org.apache.tuscany.sca.runtime.RuntimeWire;
import org.osoa.sca.ServiceRuntimeException;
/**
* Implementation of a Service for the RMIBinding.
*
* @version $Rev$ $Date$
*/
public class RMIServiceBindingProvider implements ServiceBindingProvider {
private RuntimeComponent component;
private RuntimeComponentService service;
private RMIBinding binding;
private RMIHost rmiHost;
private RuntimeWire wire;
public RMIServiceBindingProvider(RuntimeComponent rc, RuntimeComponentService rcs, RMIBinding binding, RMIHost rmiHost) {
this.component = rc;
this.service = rcs;
this.binding = binding;
this.rmiHost = rmiHost;
}
public void start() {
// URI uri = URI.create(component.getURI() + "/" + binding.getName());
// binding.setURI(uri.toString());
wire = service.getRuntimeWire(binding);
Interface serviceInterface = service.getInterfaceContract().getInterface();
Remote rmiProxy = createRmiService(serviceInterface);
try {
rmiHost.registerService(binding.getServiceName(), getPort(binding.getPort()), rmiProxy);
} catch (RMIHostException e) {
throw new ServiceRuntimeException(e);
}
}
public void stop() {
rmiHost.unregisterService(binding.getServiceName(), getPort(binding.getPort()));
}
protected int getPort(String port) {
int portNumber = RMIHost.RMI_DEFAULT_PORT;
if (port != null && port.length() > 0) {
portNumber = Integer.decode(port);
if (portNumber == -1) {
portNumber = RMIHost.RMI_DEFAULT_PORT;
}
}
return portNumber;
}
protected Remote createRmiService(final Interface serviceInterface) {
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(UnicastRemoteObject.class);
enhancer.setCallback(new MethodInterceptor() {
public Object intercept(Object arg0, Method method, Object[] args, MethodProxy arg3) throws Throwable {
try {
return invokeTarget(JavaInterfaceUtil.findOperation(method, serviceInterface.getOperations()), args);
} catch (InvocationTargetException e) {
final Throwable cause = e.getCause();
for (Class<?> declaredType : method.getExceptionTypes()) {
if (declaredType.isInstance(cause)) {
throw e;
}
}
if (cause.getCause() != null) {
// TUSCANY-2545: don't inlcude nested cause object
AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
public Object run() throws Exception {
Field field = Throwable.class.getDeclaredField("cause");
field.setAccessible(true);
field.set(cause, null);
field.setAccessible(false);
return null;
}
});
}
throw cause;
}
}
});
Class targetJavaInterface = getTargetJavaClass(serviceInterface);
if (!Remote.class.isAssignableFrom(targetJavaInterface)) {
RMIServiceClassLoader classloader = new RMIServiceClassLoader(targetJavaInterface.getClassLoader());
final byte[] byteCode = generateRemoteInterface(targetJavaInterface);
targetJavaInterface = classloader.defineClass(targetJavaInterface.getName(), byteCode);
enhancer.setClassLoader(classloader);
}
enhancer.setInterfaces(new Class[] {targetJavaInterface});
return (Remote)enhancer.create();
}
protected Object invokeTarget(Operation op, Object[] args) throws InvocationTargetException {
return wire.invoke(op, args);
}
/**
* if the interface of the component whose serviceBindings must be exposed as RMI Service, does not
* implement java.rmi.Remote, then generate such an interface. This method will stop with just
* generating the bytecode. Defining the class from the byte code must be the responsibility of the
* caller of this method, since it requires a ClassLoader to be created to define and load this interface.
*/
protected byte[] generateRemoteInterface(Class serviceInterface) {
String interfazeName = serviceInterface.getName();
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
String simpleName = serviceInterface.getSimpleName();
cw.visit(Constants.V1_5, Constants.ACC_PUBLIC + Constants.ACC_ABSTRACT + Constants.ACC_INTERFACE, interfazeName
.replace('.', '/'), null, "java/lang/Object", new String[] {"java/rmi/Remote"});
StringBuffer argsAndReturn = null;
Method[] methods = serviceInterface.getMethods();
for (Method method : methods) {
argsAndReturn = new StringBuffer("(");
Class[] paramTypes = method.getParameterTypes();
Class returnType = method.getReturnType();
for (Class paramType : paramTypes) {
argsAndReturn.append(Type.getType(paramType));
}
argsAndReturn.append(")");
argsAndReturn.append(Type.getType(returnType));
cw.visitMethod(Constants.ACC_PUBLIC + Constants.ACC_ABSTRACT,
method.getName(),
argsAndReturn.toString(),
null,
new String[] {"java/rmi/RemoteException"});
}
cw.visitEnd();
return cw.toByteArray();
}
protected Class<?> getTargetJavaClass(Interface targetInterface) {
// TODO: right now assume that the target is always a Java
// Implementation. Need to figure out
// how to generate Java Interface in cases where the target is not a
// Java Implementation
return ((JavaInterface)targetInterface).getJavaClass();
}
protected class RMIServiceClassLoader extends ClassLoader {
public RMIServiceClassLoader(ClassLoader parent) {
super(parent);
}
public Class<?> defineClass(String name, byte[] byteArray) {
return super.defineClass(name, byteArray, 0, byteArray.length);
}
}
public InterfaceContract getBindingInterfaceContract() {
return service.getInterfaceContract();
}
public boolean supportsOneWayInvocation() {
return false;
}
}
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