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