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: 47154 $ 037 */ 038 public class BeanProcessor extends ServiceSupport implements Processor { 039 public static final String METHOD_NAME = "org.apache.camel.MethodName"; 040 public static final String MULTI_PARAMETER_ARRAY = "org.apache.camel.MultiParameterArray"; 041 private static final transient Log LOG = LogFactory.getLog(BeanProcessor.class); 042 043 private boolean multiParameterArray; 044 private Method methodObject; 045 private String method; 046 private BeanHolder beanHolder; 047 048 public BeanProcessor(Object pojo, BeanInfo beanInfo) { 049 this(new ConstantBeanHolder(pojo, beanInfo)); 050 } 051 052 public BeanProcessor(Object pojo, CamelContext camelContext, ParameterMappingStrategy parameterMappingStrategy) { 053 this(pojo, new BeanInfo(camelContext, pojo.getClass(), parameterMappingStrategy)); 054 } 055 056 public BeanProcessor(Object pojo, CamelContext camelContext) { 057 this(pojo, camelContext, BeanInfo.createParameterMappingStrategy(camelContext)); 058 } 059 060 public BeanProcessor(BeanHolder beanHolder) { 061 this.beanHolder = beanHolder; 062 } 063 064 @Override 065 public String toString() { 066 String description = methodObject != null ? " " + methodObject : ""; 067 return "BeanProcessor[" + beanHolder + description + "]"; 068 } 069 070 public void process(Exchange exchange) throws Exception { 071 Object bean = beanHolder.getBean(); 072 exchange.setProperty("org.apache.camel.bean.BeanHolder", beanHolder); 073 074 Processor processor = getProcessor(); 075 BeanInfo beanInfo = beanHolder.getBeanInfo(); 076 077 // do we have a custom adapter for this POJO to a Processor 078 if (processor != null) { 079 processor.process(exchange); 080 return; 081 } 082 Message in = exchange.getIn(); 083 084 if (in.getHeader(MULTI_PARAMETER_ARRAY) == null) { 085 in.setHeader(MULTI_PARAMETER_ARRAY, isMultiParameterArray()); 086 } 087 088 BeanInvocation beanInvoke = in.getBody(BeanInvocation.class); 089 if (beanInvoke != null) { 090 beanInvoke.invoke(bean, exchange); 091 return; 092 } 093 094 boolean isExplicitMethod = false; 095 String prevMethod = null; 096 MethodInvocation invocation; 097 if (methodObject != null) { 098 invocation = beanInfo.createInvocation(methodObject, bean, exchange); 099 } else { 100 // we just override the bean's invocation method name here 101 if (ObjectHelper.isNotNullAndNonEmpty(method)) { 102 prevMethod = in.getHeader(METHOD_NAME, String.class); 103 in.setHeader(METHOD_NAME, method); 104 isExplicitMethod = true; 105 } 106 invocation = beanInfo.createInvocation(bean, exchange); 107 } 108 if (invocation == null) { 109 throw new IllegalStateException("No method invocation could be created, " 110 + "no maching method could be found on: " + bean); 111 } 112 try { 113 Object value = invocation.proceed(); 114 if (value != null) { 115 if (exchange.getPattern().isOutCapable()) { 116 // force out creating if not already created (as its lazy) 117 if (LOG.isDebugEnabled()) { 118 LOG.debug("Setting bean invocation result on the OUT message: " + value); 119 } 120 exchange.getOut(true).setBody(value); 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 cause = e.getCause(); 132 if (cause instanceof Exception) { 133 throw (Exception) cause; 134 } else { 135 // do not handle errors! 136 throw e; 137 } 138 } catch (Exception e) { 139 throw e; 140 } catch (Throwable throwable) { 141 throw new Exception(throwable); 142 } finally { 143 if (isExplicitMethod) { 144 in.setHeader(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 /** 184 * Kept around for backwards compatibility, please use {@link #setMethod(String)} 185 * in future instead. 186 * 187 * @deprecated use {@link #setMethod(String)}. Will be removed in Camel 2.0. 188 */ 189 @Deprecated 190 public void setMethodName(String method) { 191 setMethod(method); 192 } 193 194 // Implementation methods 195 //------------------------------------------------------------------------- 196 protected void doStart() throws Exception { 197 ServiceHelper.startService(getProcessor()); 198 } 199 200 protected void doStop() throws Exception { 201 ServiceHelper.stopService(getProcessor()); 202 } 203 }