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 }