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.pojo; 018 019 import org.apache.camel.Consumer; 020 import org.apache.camel.Exchange; 021 import org.apache.camel.NoSuchEndpointException; 022 import org.apache.camel.Processor; 023 import org.apache.camel.Producer; 024 import org.apache.camel.Component; 025 import org.apache.camel.impl.DefaultEndpoint; 026 import org.apache.camel.impl.DefaultProducer; 027 import org.apache.camel.spi.Provider; 028 029 import java.lang.reflect.InvocationTargetException; 030 031 /** 032 * Represents a pojo endpoint that uses reflection 033 * to send messages around. 034 * 035 * @version $Revision: 519973 $ 036 */ 037 public class PojoEndpoint extends DefaultEndpoint<PojoExchange> { 038 private Object pojo; 039 040 public PojoEndpoint(String uri, Component component, Object pojo) { 041 super(uri, component); 042 this.pojo = pojo; 043 } 044 045 public Producer<PojoExchange> createProducer() throws Exception { 046 final Object pojo = getPojo(); 047 if (pojo == null) { 048 throw new NoPojoAvailableException(this); 049 } 050 051 return new DefaultProducer(this) { 052 public void process(Exchange exchange) { 053 PojoExchange pojoExchange = toExchangeType(exchange); 054 invoke(pojo, pojoExchange); 055 exchange.copyFrom(pojoExchange); 056 } 057 }; 058 } 059 060 public Consumer<PojoExchange> createConsumer(Processor processor) throws Exception { 061 throw new Exception("You cannot consume from pojo endpoints."); 062 } 063 064 /** 065 * This causes us to invoke the endpoint Pojo using reflection. 066 * 067 * @param pojo 068 */ 069 public static void invoke(Object pojo, PojoExchange exchange) { 070 PojoInvocation invocation = exchange.getInvocation(); 071 try { 072 Object response = invocation.getMethod().invoke(pojo, invocation.getArgs()); 073 exchange.getOut().setBody(response); 074 } 075 catch (InvocationTargetException e) { 076 exchange.setException(e.getCause()); 077 } 078 catch (RuntimeException e) { 079 throw e; 080 } 081 catch (Throwable e) { 082 throw new RuntimeException(e); 083 } 084 } 085 086 public PojoExchange createExchange() { 087 return new PojoExchange(getContext()); 088 } 089 090 public boolean isSingleton() { 091 return true; 092 } 093 094 public Object getPojo() { 095 return pojo; 096 } 097 098 public void setPojo(Object pojo) { 099 this.pojo = pojo; 100 } 101 }