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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;
+ }
+}