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: 45097 $ 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 if (LOG.isDebugEnabled()) { 072 LOG.debug(">>>> invoking method for: " + exchange); 073 } 074 075 Object bean = beanHolder.getBean(); 076 exchange.setProperty("org.apache.camel.bean.BeanHolder", beanHolder); 077 078 Processor processor = getProcessor(); 079 BeanInfo beanInfo = beanHolder.getBeanInfo(); 080 081 // do we have a custom adapter for this POJO to a Processor 082 if (processor != null) { 083 processor.process(exchange); 084 return; 085 } 086 Message in = exchange.getIn(); 087 088 if (in.getHeader(MULTI_PARAMETER_ARRAY) == null) { 089 in.setHeader(MULTI_PARAMETER_ARRAY, isMultiParameterArray()); 090 } 091 092 BeanInvocation beanInvoke = in.getBody(BeanInvocation.class); 093 if (beanInvoke != null) { 094 beanInvoke.invoke(bean, exchange); 095 return; 096 } 097 098 boolean isExplicitMethod = false; 099 String prevMethod = null; 100 MethodInvocation invocation; 101 if (methodObject != null) { 102 invocation = beanInfo.createInvocation(methodObject, bean, exchange); 103 } else { 104 // we just override the bean's invocation method name here 105 if (ObjectHelper.isNotNullAndNonEmpty(method)) { 106 prevMethod = in.getHeader(METHOD_NAME, String.class); 107 in.setHeader(METHOD_NAME, method); 108 isExplicitMethod = true; 109 } 110 invocation = beanInfo.createInvocation(bean, exchange); 111 } 112 if (invocation == null) { 113 throw new IllegalStateException("No method invocation could be created, " 114 + "no maching method could be found on: " + bean); 115 } 116 try { 117 Object value = invocation.proceed(); 118 if (value != null) { 119 if (exchange.getPattern().isOutCapable()) { 120 // force out creating if not already created (as its lazy) 121 if (LOG.isDebugEnabled()) { 122 LOG.debug("Setting bean invocation value on OUT message: " + value); 123 } 124 exchange.getOut(true).setBody(value); 125 } else { 126 // if not out then set it on the in 127 if (LOG.isDebugEnabled()) { 128 LOG.debug("Setting bean invocation value on IN message: " + value); 129 } 130 exchange.getIn().setBody(value); 131 } 132 } 133 } catch (InvocationTargetException e) { 134 // lets unwrap the exception 135 Throwable cause = e.getCause(); 136 if (cause instanceof Exception) { 137 throw (Exception) cause; 138 } else { 139 // do not handle errors! 140 throw e; 141 } 142 } catch (Exception e) { 143 throw e; 144 } catch (Throwable throwable) { 145 throw new Exception(throwable); 146 } finally { 147 if (isExplicitMethod) { 148 in.setHeader(METHOD_NAME, prevMethod); 149 } 150 } 151 } 152 153 protected Processor getProcessor() { 154 return beanHolder.getProcessor(); 155 } 156 157 // Properties 158 // ----------------------------------------------------------------------- 159 160 public Method getMethodObject() { 161 return methodObject; 162 } 163 164 public void setMethodObject(Method methodObject) { 165 this.methodObject = methodObject; 166 } 167 168 public String getMethod() { 169 return method; 170 } 171 172 public boolean isMultiParameterArray() { 173 return multiParameterArray; 174 } 175 176 public void setMultiParameterArray(boolean mpArray) { 177 multiParameterArray = mpArray; 178 } 179 180 /** 181 * Sets the method name to use 182 */ 183 public void setMethod(String method) { 184 this.method = method; 185 } 186 187 /** 188 * Kept around for backwards compatibility, please use {@link #setMethod(String)} 189 * in future instead. 190 * 191 * @deprecated use {@link #setMethod(String)}. Will be removed in Camel 2.0. 192 */ 193 @Deprecated 194 public void setMethodName(String method) { 195 setMethod(method); 196 } 197 198 // Implementation methods 199 //------------------------------------------------------------------------- 200 protected void doStart() throws Exception { 201 ServiceHelper.startService(getProcessor()); 202 } 203 204 protected void doStop() throws Exception { 205 ServiceHelper.stopService(getProcessor()); 206 } 207 }