From e5b7380c874745c989d1816b8f552504f038e1bc Mon Sep 17 00:00:00 2001
From: lresende <lresende@13f79535-47bb-0310-9956-ffa450edef68>
Date: Thu, 26 Sep 2013 20:33:20 +0000
Subject: 2.0 branch for possible maintenance release

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@1526672 13f79535-47bb-0310-9956-ffa450edef68
---
 .../rmi/provider/RemoteInterfaceGenerator.java     | 102 +++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 sca-java-2.x/branches/2.0/modules/binding-rmi-runtime/src/main/java/org/apache/tuscany/sca/binding/rmi/provider/RemoteInterfaceGenerator.java

(limited to 'sca-java-2.x/branches/2.0/modules/binding-rmi-runtime/src/main/java/org/apache/tuscany/sca/binding/rmi/provider/RemoteInterfaceGenerator.java')

diff --git a/sca-java-2.x/branches/2.0/modules/binding-rmi-runtime/src/main/java/org/apache/tuscany/sca/binding/rmi/provider/RemoteInterfaceGenerator.java b/sca-java-2.x/branches/2.0/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/branches/2.0/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;
+        }
+    }
+
+}
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