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: 45740 $
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