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.NoTypeConversionAvailableException; 026 import org.apache.camel.Processor; 027 import org.apache.camel.impl.ServiceSupport; 028 import org.apache.camel.util.ObjectHelper; 029 import org.apache.camel.util.ServiceHelper; 030 import org.apache.commons.logging.Log; 031 import org.apache.commons.logging.LogFactory; 032 033 /** 034 * A {@link Processor} which converts the inbound exchange to a method 035 * invocation on a POJO 036 * 037 * @version $Revision: 750349 $ 038 */ 039 public class BeanProcessor extends ServiceSupport implements Processor { 040 private static final transient Log LOG = LogFactory.getLog(BeanProcessor.class); 041 042 private boolean multiParameterArray; 043 private Method methodObject; 044 private String method; 045 private BeanHolder beanHolder; 046 047 public BeanProcessor(Object pojo, BeanInfo beanInfo) { 048 this(new ConstantBeanHolder(pojo, beanInfo)); 049 } 050 051 public BeanProcessor(Object pojo, CamelContext camelContext, ParameterMappingStrategy parameterMappingStrategy) { 052 this(pojo, new BeanInfo(camelContext, pojo.getClass(), parameterMappingStrategy)); 053 } 054 055 public BeanProcessor(Object pojo, CamelContext camelContext) { 056 this(pojo, camelContext, BeanInfo.createParameterMappingStrategy(camelContext)); 057 } 058 059 public BeanProcessor(BeanHolder beanHolder) { 060 this.beanHolder = beanHolder; 061 } 062 063 @Override 064 public String toString() { 065 String description = methodObject != null ? " " + methodObject : ""; 066 return "BeanProcessor[" + beanHolder + description + "]"; 067 } 068 069 public void process(Exchange exchange) throws Exception { 070 Object bean = beanHolder.getBean(); 071 exchange.setProperty(Exchange.BEAN_HOLDER, beanHolder); 072 073 Processor processor = getProcessor(); 074 BeanInfo beanInfo = beanHolder.getBeanInfo(); 075 076 // do we have a custom adapter for this POJO to a Processor 077 if (processor != null) { 078 processor.process(exchange); 079 return; 080 } 081 Message in = exchange.getIn(); 082 083 if (in.getHeader(Exchange.BEAN_MULTI_PARAMETER_ARRAY) == null) { 084 in.setHeader(Exchange.BEAN_MULTI_PARAMETER_ARRAY, isMultiParameterArray()); 085 } 086 087 try { 088 BeanInvocation beanInvoke = in.getBody(BeanInvocation.class); 089 if (beanInvoke != null) { 090 beanInvoke.invoke(bean, exchange); 091 return; 092 } 093 } catch (NoTypeConversionAvailableException ex) { 094 // ignore, body is not a BeanInvocation 095 } 096 097 boolean isExplicitMethod = false; 098 String prevMethod = null; 099 MethodInvocation invocation; 100 if (methodObject != null) { 101 invocation = beanInfo.createInvocation(methodObject, bean, exchange); 102 } else { 103 // we just override the bean's invocation method name here 104 if (ObjectHelper.isNotEmpty(method)) { 105 prevMethod = in.getHeader(Exchange.BEAN_METHOD_NAME, String.class); 106 in.setHeader(Exchange.BEAN_METHOD_NAME, method); 107 isExplicitMethod = true; 108 } 109 invocation = beanInfo.createInvocation(bean, exchange); 110 } 111 if (invocation == null) { 112 throw new IllegalStateException( 113 "No method invocation could be created, no maching method could be found on: " + bean); 114 } 115 try { 116 Object value = invocation.proceed(); 117 if (value != null) { 118 if (exchange.getPattern().isOutCapable()) { 119 // force out creating if not already created (as its lazy) 120 if (LOG.isDebugEnabled()) { 121 LOG.debug("Setting bean invocation result on the OUT message: " + value); 122 } 123 exchange.getOut(true).setBody(value); 124 } else { 125 // if not out then set it on the in 126 if (LOG.isDebugEnabled()) { 127 LOG.debug("Setting bean invocation result on the IN message: " + value); 128 } 129 exchange.getIn().setBody(value); 130 } 131 } 132 } catch (InvocationTargetException e) { 133 // lets unwrap the exception 134 Throwable throwable = e.getCause(); 135 if (throwable instanceof Exception) { 136 Exception exception = (Exception)throwable; 137 throw exception; 138 } else { 139 Error error = (Error)throwable; 140 throw error; 141 } 142 } finally { 143 if (isExplicitMethod) { 144 in.setHeader(Exchange.BEAN_METHOD_NAME, prevMethod); 145 } 146 } 147 } 148 149 protected Processor getProcessor() { 150 return beanHolder.getProcessor(); 151 } 152 153 // Properties 154 // ----------------------------------------------------------------------- 155 156 public Method getMethodObject() { 157 return methodObject; 158 } 159 160 public void setMethodObject(Method methodObject) { 161 this.methodObject = methodObject; 162 } 163 164 public String getMethod() { 165 return method; 166 } 167 168 public boolean isMultiParameterArray() { 169 return multiParameterArray; 170 } 171 172 public void setMultiParameterArray(boolean mpArray) { 173 multiParameterArray = mpArray; 174 } 175 176 /** 177 * Sets the method name to use 178 */ 179 public void setMethod(String method) { 180 this.method = method; 181 } 182 183 // Implementation methods 184 //------------------------------------------------------------------------- 185 protected void doStart() throws Exception { 186 ServiceHelper.startService(getProcessor()); 187 } 188 189 protected void doStop() throws Exception { 190 ServiceHelper.stopService(getProcessor()); 191 } 192 }