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.InvocationTargetException; 020 import java.lang.reflect.Method; 021 022 import org.apache.camel.CamelContext; 023 import org.apache.camel.Exchange; 024 import org.apache.camel.Message; 025 import org.apache.camel.Processor; 026 import org.apache.camel.impl.ServiceSupport; 027 import org.apache.camel.util.ObjectHelper; 028 import org.apache.camel.util.ServiceHelper; 029 import org.apache.commons.logging.Log; 030 import org.apache.commons.logging.LogFactory; 031 032 /** 033 * A {@link Processor} which converts the inbound exchange to a method 034 * invocation on a POJO 035 * 036 * @version $Revision: 769448 $ 037 */ 038 public class BeanProcessor extends ServiceSupport implements Processor { 039 private static final transient Log LOG = LogFactory.getLog(BeanProcessor.class); 040 041 private boolean multiParameterArray; 042 private Method methodObject; 043 private String method; 044 private BeanHolder beanHolder; 045 046 public BeanProcessor(Object pojo, BeanInfo beanInfo) { 047 this(new ConstantBeanHolder(pojo, beanInfo)); 048 } 049 050 public BeanProcessor(Object pojo, CamelContext camelContext, ParameterMappingStrategy parameterMappingStrategy) { 051 this(pojo, new BeanInfo(camelContext, pojo.getClass(), parameterMappingStrategy)); 052 } 053 054 public BeanProcessor(Object pojo, CamelContext camelContext) { 055 this(pojo, camelContext, BeanInfo.createParameterMappingStrategy(camelContext)); 056 } 057 058 public BeanProcessor(BeanHolder beanHolder) { 059 this.beanHolder = beanHolder; 060 } 061 062 @Override 063 public String toString() { 064 String description = methodObject != null ? " " + methodObject : ""; 065 return "BeanProcessor[" + beanHolder + description + "]"; 066 } 067 068 public void process(Exchange exchange) throws Exception { 069 Object bean = beanHolder.getBean(); 070 exchange.setProperty(Exchange.BEAN_HOLDER, beanHolder); 071 072 Processor processor = getProcessor(); 073 BeanInfo beanInfo = beanHolder.getBeanInfo(); 074 075 // do we have a custom adapter for this POJO to a Processor 076 if (processor != null) { 077 processor.process(exchange); 078 return; 079 } 080 Message in = exchange.getIn(); 081 082 if (in.getHeader(Exchange.BEAN_MULTI_PARAMETER_ARRAY) == null) { 083 in.setHeader(Exchange.BEAN_MULTI_PARAMETER_ARRAY, isMultiParameterArray()); 084 } 085 086 BeanInvocation beanInvoke = in.getBody(BeanInvocation.class); 087 if (beanInvoke != null) { 088 beanInvoke.invoke(bean, exchange); 089 return; 090 } 091 092 boolean isExplicitMethod = false; 093 String prevMethod = null; 094 MethodInvocation invocation; 095 if (methodObject != null) { 096 invocation = beanInfo.createInvocation(methodObject, bean, exchange); 097 } else { 098 // we just override the bean's invocation method name here 099 if (ObjectHelper.isNotEmpty(method)) { 100 prevMethod = in.getHeader(Exchange.BEAN_METHOD_NAME, String.class); 101 in.setHeader(Exchange.BEAN_METHOD_NAME, method); 102 isExplicitMethod = true; 103 } 104 invocation = beanInfo.createInvocation(bean, exchange); 105 } 106 if (invocation == null) { 107 throw new IllegalStateException( 108 "No method invocation could be created, no maching method could be found on: " + bean); 109 } 110 try { 111 Object value = invocation.proceed(); 112 if (value != null) { 113 if (exchange.getPattern().isOutCapable()) { 114 // force out creating if not already created (as its lazy) 115 if (LOG.isDebugEnabled()) { 116 LOG.debug("Setting bean invocation result on the OUT message: " + value); 117 } 118 exchange.getOut().setBody(value); 119 // propagate headers 120 exchange.getOut().getHeaders().putAll(exchange.getIn().getHeaders()); 121 } else { 122 // if not out then set it on the in 123 if (LOG.isDebugEnabled()) { 124 LOG.debug("Setting bean invocation result on the IN message: " + value); 125 } 126 exchange.getIn().setBody(value); 127 } 128 } 129 } catch (InvocationTargetException e) { 130 // lets unwrap the exception 131 Throwable throwable = e.getCause(); 132 if (throwable instanceof Exception) { 133 Exception exception = (Exception)throwable; 134 throw exception; 135 } else { 136 Error error = (Error)throwable; 137 throw error; 138 } 139 } finally { 140 if (isExplicitMethod) { 141 in.setHeader(Exchange.BEAN_METHOD_NAME, prevMethod); 142 } 143 } 144 } 145 146 protected Processor getProcessor() { 147 return beanHolder.getProcessor(); 148 } 149 150 // Properties 151 // ----------------------------------------------------------------------- 152 153 public Method getMethodObject() { 154 return methodObject; 155 } 156 157 public void setMethodObject(Method methodObject) { 158 this.methodObject = methodObject; 159 } 160 161 public String getMethod() { 162 return method; 163 } 164 165 public boolean isMultiParameterArray() { 166 return multiParameterArray; 167 } 168 169 public void setMultiParameterArray(boolean mpArray) { 170 multiParameterArray = mpArray; 171 } 172 173 /** 174 * Sets the method name to use 175 */ 176 public void setMethod(String method) { 177 this.method = method; 178 } 179 180 // Implementation methods 181 //------------------------------------------------------------------------- 182 protected void doStart() throws Exception { 183 ServiceHelper.startService(getProcessor()); 184 } 185 186 protected void doStop() throws Exception { 187 ServiceHelper.stopService(getProcessor()); 188 } 189 }