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.Exchange;
025 import org.apache.camel.ExchangePattern;
026 import org.apache.camel.Producer;
027 import org.apache.camel.impl.DefaultExchange;
028
029 /**
030 * An {@link java.lang.reflect.InvocationHandler} which invokes a
031 * message exchange on a camel {@link Endpoint}
032 *
033 * @version $Revision: 733079 $
034 */
035 public class CamelInvocationHandler implements InvocationHandler {
036 private final Endpoint endpoint;
037 private final Producer producer;
038 private final MethodInfoCache methodInfoCache;
039
040 public CamelInvocationHandler(Endpoint endpoint, Producer producer, MethodInfoCache methodInfoCache) {
041 this.endpoint = endpoint;
042 this.producer = producer;
043 this.methodInfoCache = methodInfoCache;
044 }
045
046 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
047 BeanInvocation invocation = new BeanInvocation(method, args);
048 ExchangePattern pattern = ExchangePattern.InOut;
049 MethodInfo methodInfo = methodInfoCache.getMethodInfo(method);
050 if (methodInfo != null) {
051 pattern = methodInfo.getPattern();
052 }
053 Exchange exchange = new DefaultExchange(endpoint, pattern);
054 exchange.getIn().setBody(invocation);
055
056 producer.process(exchange);
057 Throwable fault = exchange.getException();
058 if (fault != null) {
059 throw new InvocationTargetException(fault);
060 }
061 if (pattern.isOutCapable()) {
062 return exchange.getOut(true).getBody();
063 } else {
064 return null;
065 }
066 }
067 }
068