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Diffstat (limited to '')
-rw-r--r-- | sca-java-2.x/tags/2.0-Beta1-RC2/modules/binding-rmi-runtime/src/main/java/org/apache/tuscany/sca/binding/rmi/provider/RemoteInterfaceGenerator.java | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/sca-java-2.x/tags/2.0-Beta1-RC2/modules/binding-rmi-runtime/src/main/java/org/apache/tuscany/sca/binding/rmi/provider/RemoteInterfaceGenerator.java b/sca-java-2.x/tags/2.0-Beta1-RC2/modules/binding-rmi-runtime/src/main/java/org/apache/tuscany/sca/binding/rmi/provider/RemoteInterfaceGenerator.java new file mode 100644 index 0000000000..b351bfacc7 --- /dev/null +++ b/sca-java-2.x/tags/2.0-Beta1-RC2/modules/binding-rmi-runtime/src/main/java/org/apache/tuscany/sca/binding/rmi/provider/RemoteInterfaceGenerator.java @@ -0,0 +1,102 @@ +/* + * 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.Method; +import java.rmi.Remote; +import java.util.Collections; +import java.util.Map; +import java.util.WeakHashMap; + +import net.sf.cglib.core.Constants; + +import org.objectweb.asm.ClassWriter; +import org.objectweb.asm.Type; + +/** + * + */ +public class RemoteInterfaceGenerator { + private final static Map<Class<?>, Class<? extends Remote>> remoteInterfaces = + Collections.synchronizedMap(new WeakHashMap<Class<?>, Class<? extends Remote>>()); + + static class RemoteInterfaceClassLoader extends ClassLoader { + public RemoteInterfaceClassLoader(ClassLoader parent) { + super(parent); + } + + public Class<?> defineClass(String name, byte[] byteArray) { + return defineClass(name, byteArray, 0, byteArray.length); + } + } + + /** + * 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. + */ + private static byte[] generateRemoteInterface(Class<?> serviceInterface) { + String interfazeName = serviceInterface.getName(); + ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS); + + 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(); + } + + public static Class<? extends Remote> generate(Class<?> javaInterface) { + if (!Remote.class.isAssignableFrom(javaInterface)) { + Class<? extends Remote> remote = remoteInterfaces.get(javaInterface); + if (remote == null) { + RemoteInterfaceClassLoader classloader = new RemoteInterfaceClassLoader(javaInterface.getClassLoader()); + final byte[] byteCode = generateRemoteInterface(javaInterface); + javaInterface = classloader.defineClass(javaInterface.getName(), byteCode); + remote = (Class<? extends Remote>)javaInterface; + remoteInterfaces.put(javaInterface, remote); + } + return remote; + } else { + return (Class<? extends Remote>)javaInterface; + } + } + +} |