001 /** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.camel.component.rmi; 018 019 import java.lang.reflect.InvocationHandler; 020 import java.lang.reflect.InvocationTargetException; 021 import java.lang.reflect.Method; 022 import java.lang.reflect.Proxy; 023 import java.rmi.Remote; 024 import java.rmi.registry.Registry; 025 import java.rmi.server.UnicastRemoteObject; 026 027 import org.apache.camel.Processor; 028 import org.apache.camel.component.bean.BeanExchange; 029 import org.apache.camel.component.bean.BeanInvocation; 030 import org.apache.camel.impl.DefaultConsumer; 031 032 /** 033 * A {@link Consumer} which uses RMI's {@see UnicastRemoteObject} to consume 034 * method invocations. 035 * 036 * @version $Revision: 533758 $ 037 */ 038 public class RmiConsumer extends DefaultConsumer<BeanExchange> implements InvocationHandler { 039 040 private final RmiEndpoint endpoint; 041 private Remote stub; 042 private Remote proxy; 043 044 public RmiConsumer(RmiEndpoint endpoint, Processor processor) { 045 super(endpoint, processor); 046 this.endpoint = endpoint; 047 048 } 049 050 @Override 051 protected void doStart() throws Exception { 052 Class[] interfaces = new Class[endpoint.getRemoteInterfaces().size()]; 053 endpoint.getRemoteInterfaces().toArray(interfaces); 054 proxy = (Remote)Proxy.newProxyInstance(endpoint.getClassLoader(), interfaces, this); 055 stub = UnicastRemoteObject.exportObject(proxy, endpoint.getPort()); 056 057 try { 058 Registry registry = endpoint.getRegistry(); 059 String name = endpoint.getName(); 060 registry.bind(name, stub); 061 062 } catch (Exception e) { // Registration might fail.. clean up.. 063 try { 064 UnicastRemoteObject.unexportObject(stub, true); 065 } catch (Throwable ignore) { 066 } 067 stub = null; 068 throw e; 069 } 070 super.doStart(); 071 } 072 073 @Override 074 protected void doStop() throws Exception { 075 super.doStop(); 076 try { 077 Registry registry = endpoint.getRegistry(); 078 registry.unbind(endpoint.getName()); 079 } catch (Throwable e) { // do our best to unregister 080 } 081 UnicastRemoteObject.unexportObject(proxy, true); 082 } 083 084 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { 085 if (!isStarted()) { 086 throw new IllegalStateException("The endpoint is not active: " + getEndpoint().getEndpointUri()); 087 } 088 BeanInvocation invocation = new BeanInvocation(proxy, method, args); 089 BeanExchange exchange = getEndpoint().createExchange(); 090 exchange.setInvocation(invocation); 091 getProcessor().process(exchange); 092 Throwable fault = exchange.getException(); 093 if (fault != null) { 094 throw new InvocationTargetException(fault); 095 } 096 return exchange.getOut().getBody(); 097 } 098 099 public Remote getProxy() { 100 return proxy; 101 } 102 103 public Remote getStub() { 104 return stub; 105 } 106 }