| /* |
| * 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.ode.jacob.vpu; |
| |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| |
| import org.apache.ode.jacob.Channel; |
| import org.apache.ode.jacob.soup.CommChannel; |
| import org.apache.ode.utils.CollectionUtils; |
| |
| public class ChannelFactory { |
| private static final Method METHOD_OBJECT_EQUALS; |
| |
| private static final Method METHOD_CHANNEL_EXPORT; |
| |
| static { |
| try { |
| METHOD_OBJECT_EQUALS = Object.class.getMethod("equals", new Class[] { Object.class }); |
| } catch (Exception e) { |
| throw new AssertionError("No equals(Object) method on Object!"); |
| } |
| |
| try { |
| METHOD_CHANNEL_EXPORT = Channel.class.getMethod("export", CollectionUtils.EMPTY_CLASS_ARRAY); |
| } catch (Exception e) { |
| throw new AssertionError("No export() method on Object!"); |
| } |
| } |
| |
| public static Object getBackend(Channel channel) { |
| ChannelInvocationHandler cih = (ChannelInvocationHandler) Proxy.getInvocationHandler(channel); |
| return cih._backend; |
| } |
| |
| public static Channel createChannel(CommChannel backend, Class type) { |
| InvocationHandler h = new ChannelInvocationHandler(backend); |
| Class[] ifaces = new Class[] { Channel.class, type }; |
| Object proxy = Proxy.newProxyInstance(Channel.class.getClassLoader(), ifaces, h); |
| return (Channel) proxy; |
| } |
| |
| public static final class ChannelInvocationHandler implements InvocationHandler { |
| private CommChannel _backend; |
| |
| ChannelInvocationHandler(CommChannel backend) { |
| _backend = backend; |
| } |
| |
| public String toString() { |
| return _backend.toString(); |
| } |
| |
| public boolean equals(Object other) { |
| return ((ChannelInvocationHandler) other)._backend.equals(_backend); |
| } |
| |
| public int hashCode() { |
| return _backend.hashCode(); |
| } |
| |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| if (method.getDeclaringClass() == Object.class) { |
| if (method.equals(METHOD_OBJECT_EQUALS)) { |
| return Boolean.valueOf(this.equals(Proxy.getInvocationHandler(args[0]))); |
| } |
| return method.invoke(this, args); |
| } |
| if (method.equals(METHOD_CHANNEL_EXPORT)) { |
| return JacobVPU.activeJacobThread().exportChannel((Channel) proxy); |
| } |
| return JacobVPU.activeJacobThread().message((Channel) proxy, method, args); |
| } |
| } // class ChannelInvocationHandler |
| |
| } |