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.bean;
018
019 import java.lang.reflect.InvocationHandler;
020 import java.lang.reflect.InvocationTargetException;
021 import java.lang.reflect.Method;
022
023 import org.apache.camel.Endpoint;
024 import org.apache.camel.ExchangePattern;
025 import org.apache.camel.Producer;
026
027 /**
028 * An {@link java.lang.reflect.InvocationHandler} which invokes a
029 * message exchange on a camel {@link Endpoint}
030 *
031 * @version $Revision: 685050 $
032 */
033 public class CamelInvocationHandler implements InvocationHandler {
034 private final Endpoint endpoint;
035 private final Producer producer;
036 private final MethodInfoCache methodInfoCache;
037
038 public CamelInvocationHandler(Endpoint endpoint, Producer producer, MethodInfoCache methodInfoCache) {
039 this.endpoint = endpoint;
040 this.producer = producer;
041 this.methodInfoCache = methodInfoCache;
042 }
043
044 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
045 BeanInvocation invocation = new BeanInvocation(method, args);
046 ExchangePattern pattern = ExchangePattern.InOut;
047 MethodInfo methodInfo = methodInfoCache.getMethodInfo(method);
048 if (methodInfo != null) {
049 pattern = methodInfo.getPattern();
050 }
051 BeanExchange exchange = new BeanExchange(endpoint.getCamelContext(), pattern);
052 exchange.setInvocation(invocation);
053
054 producer.process(exchange);
055 Throwable fault = exchange.getException();
056 if (fault != null) {
057 throw new InvocationTargetException(fault);
058 }
059 if (pattern.isOutCapable()) {
060 return exchange.getOut(true).getBody();
061 } else {
062 return null;
063 }
064 }
065 }
066