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.spring; 018 019 import java.lang.reflect.Modifier; 020 import java.util.List; 021 import java.util.Map; 022 import java.util.Set; 023 024 import org.apache.camel.builder.RouteBuilder; 025 import org.apache.camel.util.ResolverUtil; 026 import org.apache.commons.logging.Log; 027 import org.apache.commons.logging.LogFactory; 028 import org.springframework.context.ApplicationContext; 029 030 /** 031 * A helper class which will find all {@link RouteBuilder} instances on the classpath 032 * 033 * @version $Revision: 35332 $ 034 */ 035 public class RouteBuilderFinder { 036 private static final transient Log LOG = LogFactory.getLog(RouteBuilderFinder.class); 037 private final SpringCamelContext camelContext; 038 private final String[] packages; 039 private ApplicationContext applicationContext; 040 private ResolverUtil resolver = new ResolverUtil(); 041 042 public RouteBuilderFinder(SpringCamelContext camelContext, String[] packages, ClassLoader classLoader) { 043 this.camelContext = camelContext; 044 this.applicationContext = camelContext.getApplicationContext(); 045 this.packages = packages; 046 047 // lets add all the available class loaders just in case of wierdness 048 // we could make this more strict once we've worked out all the gremlins 049 // in servicemix-camel 050 Set set = resolver.getClassLoaders(); 051 set.clear(); 052 set.add(classLoader); 053 /* 054 set.add(classLoader); 055 set.add(applicationContext.getClassLoader()); 056 set.add(getClass().getClassLoader()); 057 */ 058 } 059 060 public String[] getPackages() { 061 return packages; 062 } 063 064 public ApplicationContext getApplicationContext() { 065 return applicationContext; 066 } 067 068 069 /** 070 * Appends all the {@link RouteBuilder} instances that can be found on the classpath 071 */ 072 public void appendBuilders(List<RouteBuilder> list) throws IllegalAccessException, InstantiationException { 073 resolver.findImplementations(RouteBuilder.class, packages); 074 Set<Class> classes = resolver.getClasses(); 075 for (Class aClass : classes) { 076 if (shouldIgnoreBean(aClass)) { 077 continue; 078 } 079 if (isValidClass(aClass)) { 080 RouteBuilder builder = instantiateBuilder(aClass); 081 list.add(builder); 082 } 083 } 084 } 085 086 public void destroy() throws Exception { 087 } 088 089 /** 090 * Lets ignore beans that are not explicitly configured in the spring.xml 091 */ 092 protected boolean shouldIgnoreBean(Class type) { 093 Map beans = applicationContext.getBeansOfType(type, true, true); 094 if (beans == null || beans.isEmpty()) { 095 return false; 096 } 097 // TODO apply some filter? 098 return true; 099 } 100 101 /** 102 * Returns true if the object is non-abstract and supports a zero argument constructor 103 */ 104 protected boolean isValidClass(Class type) { 105 if (!Modifier.isAbstract(type.getModifiers()) && !type.isInterface()) { 106 return true; 107 } 108 return false; 109 } 110 111 protected RouteBuilder instantiateBuilder(Class type) throws IllegalAccessException, InstantiationException { 112 return (RouteBuilder) camelContext.getInjector().newInstance(type); 113 } 114 }