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: 13853 $ 038 */ 039 public class BeanProcessor extends ServiceSupport implements Processor { 040 public static final String METHOD_NAME = "org.apache.camel.MethodName"; 041 public static final String MULTI_PARAMETER_ARRAY = "org.apache.camel.MultiParameterArray"; 042 private static final transient Log LOG = LogFactory.getLog(BeanProcessor.class); 043 044 private boolean multiParameterArray; 045 private Method methodObject; 046 private String method; 047 private BeanHolder beanHolder; 048 049 public BeanProcessor(Object pojo, BeanInfo beanInfo) { 050 this(new ConstantBeanHolder(pojo, beanInfo)); 051 } 052 053 public BeanProcessor(Object pojo, CamelContext camelContext, ParameterMappingStrategy parameterMappingStrategy) { 054 this(pojo, new BeanInfo(camelContext, pojo.getClass(), parameterMappingStrategy)); 055 } 056 057 public BeanProcessor(Object pojo, CamelContext camelContext) { 058 this(pojo, camelContext, BeanInfo.createParameterMappingStrategy(camelContext)); 059 } 060 061 public BeanProcessor(BeanHolder beanHolder) { 062 this.beanHolder = beanHolder; 063 } 064 065 @Override 066 public String toString() { 067 String description = methodObject != null ? " " + methodObject : ""; 068 return "BeanProcessor[" + beanHolder + description + "]"; 069 } 070 071 public void process(Exchange exchange) throws Exception { 072 Object bean = beanHolder.getBean(); 073 exchange.setProperty("org.apache.camel.bean.BeanHolder", beanHolder); 074 075 Processor processor = getProcessor(); 076 BeanInfo beanInfo = beanHolder.getBeanInfo(); 077 078 // do we have a custom adapter for this POJO to a Processor 079 if (processor != null) { 080 processor.process(exchange); 081 return; 082 } 083 Message in = exchange.getIn(); 084 085 if (in.getHeader(MULTI_PARAMETER_ARRAY) == null) { 086 in.setHeader(MULTI_PARAMETER_ARRAY, isMultiParameterArray()); 087 } 088 089 try { 090 BeanInvocation beanInvoke = in.getBody(BeanInvocation.class); 091 if (beanInvoke != null) { 092 beanInvoke.invoke(bean, exchange); 093 return; 094 } 095 } catch (NoTypeConversionAvailableException ex) { 096 // ignore, body is not a BeanInvocation 097 } 098 099 boolean isExplicitMethod = false; 100 String prevMethod = null; 101 MethodInvocation invocation; 102 if (methodObject != null) { 103 invocation = beanInfo.createInvocation(methodObject, bean, exchange); 104 } else { 105 // we just override the bean's invocation method name here 106 if (ObjectHelper.isNotNullAndNonEmpty(method)) { 107 prevMethod = in.getHeader(METHOD_NAME, String.class); 108 in.setHeader(METHOD_NAME, method); 109 isExplicitMethod = true; 110 } 111 invocation = beanInfo.createInvocation(bean, exchange); 112 } 113 if (invocation == null) { 114 throw new IllegalStateException( 115 "No method invocation could be created, no maching method could be found on: " + bean); 116 } 117 Object value = null; 118 try { 119 value = invocation.proceed(); 120 } catch (InvocationTargetException e) { 121 // lets unwrap the exception 122 Throwable throwable = e.getCause(); 123 if (throwable instanceof Exception) { 124 Exception exception = (Exception)throwable; 125 throw exception; 126 } else { 127 Error error = (Error)throwable; 128 throw error; 129 } 130 } finally { 131 if (isExplicitMethod) { 132 in.setHeader(METHOD_NAME, prevMethod); 133 } 134 } 135 136 if (value != null) { 137 if (exchange.getPattern().isOutCapable()) { 138 // force out creating if not already created (as its lazy) 139 if (LOG.isDebugEnabled()) { 140 LOG.debug("Setting bean invocation result on the OUT message: " + value); 141 } 142 exchange.getOut(true).setBody(value); 143 // propagate headers 144 exchange.getOut().getHeaders().putAll(exchange.getIn().getHeaders()); 145 } else { 146 // if not out then set it on the in 147 if (LOG.isDebugEnabled()) { 148 LOG.debug("Setting bean invocation result on the IN message: " + value); 149 } 150 exchange.getIn().setBody(value); 151 } 152 } 153 } 154 155 protected Processor getProcessor() { 156 return beanHolder.getProcessor(); 157 } 158 159 // Properties 160 // ----------------------------------------------------------------------- 161 162 public Method getMethodObject() { 163 return methodObject; 164 } 165 166 public void setMethodObject(Method methodObject) { 167 this.methodObject = methodObject; 168 } 169 170 public String getMethod() { 171 return method; 172 } 173 174 public boolean isMultiParameterArray() { 175 return multiParameterArray; 176 } 177 178 public void setMultiParameterArray(boolean mpArray) { 179 multiParameterArray = mpArray; 180 } 181 182 /** 183 * Sets the method name to use 184 */ 185 public void setMethod(String method) { 186 this.method = method; 187 } 188 189 /** 190 * Kept around for backwards compatibility, please use {@link #setMethod(String)} 191 * in future instead. 192 * 193 * @deprecated use {@link #setMethod(String)}. Will be removed in Camel 2.0. 194 */ 195 @Deprecated 196 public void setMethodName(String method) { 197 setMethod(method); 198 } 199 200 // Implementation methods 201 //------------------------------------------------------------------------- 202 protected void doStart() throws Exception { 203 ServiceHelper.startService(getProcessor()); 204 } 205 206 protected void doStop() throws Exception { 207 ServiceHelper.stopService(getProcessor()); 208 } 209 }