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 */ 017package org.apache.camel.blueprint; 018 019import java.util.Collection; 020import java.util.HashSet; 021import java.util.LinkedHashMap; 022import java.util.Map; 023import java.util.Set; 024import java.util.concurrent.ConcurrentHashMap; 025 026import org.apache.camel.NoSuchBeanException; 027import org.apache.camel.spi.Registry; 028import org.osgi.framework.Bundle; 029import org.osgi.service.blueprint.container.BlueprintContainer; 030import org.osgi.service.blueprint.container.NoSuchComponentException; 031import org.osgi.service.blueprint.reflect.BeanMetadata; 032import org.osgi.service.blueprint.reflect.ComponentMetadata; 033import org.osgi.service.blueprint.reflect.ReferenceMetadata; 034 035public class BlueprintContainerRegistry implements Registry { 036 037 private final BlueprintContainer blueprintContainer; 038 039 private final Map<Class<?>, Map<String, Class<?>>> perBlueprintContainerCache = new ConcurrentHashMap<>(); 040 041 public BlueprintContainerRegistry(BlueprintContainer blueprintContainer) { 042 this.blueprintContainer = blueprintContainer; 043 } 044 045 @Override 046 public Object lookupByName(String name) { 047 try { 048 return blueprintContainer.getComponentInstance(name); 049 } catch (NoSuchComponentException e) { 050 return null; 051 } 052 } 053 054 @Override 055 public <T> T lookupByNameAndType(String name, Class<T> type) { 056 Object answer; 057 try { 058 answer = blueprintContainer.getComponentInstance(name); 059 } catch (NoSuchComponentException e) { 060 return null; 061 } 062 063 // just to be safe 064 if (answer == null) { 065 return null; 066 } 067 068 try { 069 return type.cast(answer); 070 } catch (Throwable e) { 071 String msg = "Found bean: " + name + " in BlueprintContainer: " + blueprintContainer 072 + " of type: " + answer.getClass().getName() + " expected type was: " + type; 073 throw new NoSuchBeanException(name, msg, e); 074 } 075 } 076 077 @Override 078 @SuppressWarnings("unchecked") 079 public <T> Map<String, T> findByTypeWithName(Class<T> type) { 080 if (perBlueprintContainerCache.containsKey(type)) { 081 return (Map<String, T>) perBlueprintContainerCache.get(type); 082 } 083 Map<String, T> result = lookupByType(blueprintContainer, type); 084 perBlueprintContainerCache.put(type, (Map<String, Class<?>>) result); 085 return result; 086 } 087 088 @Override 089 @SuppressWarnings("unchecked") 090 public <T> Set<T> findByType(Class<T> type) { 091 if (perBlueprintContainerCache.containsKey(type)) { 092 return new HashSet<T>((Collection<? extends T>) perBlueprintContainerCache.get(type).values()); 093 } 094 Map<String, T> map = lookupByType(blueprintContainer, type); 095 perBlueprintContainerCache.put(type, (Map<String, Class<?>>) map); 096 return new HashSet<>(map.values()); 097 } 098 099 @Override 100 public Object lookup(String name) { 101 return lookupByName(name); 102 } 103 104 @Override 105 public <T> T lookup(String name, Class<T> type) { 106 return lookupByNameAndType(name, type); 107 } 108 109 @Override 110 public <T> Map<String, T> lookupByType(Class<T> type) { 111 return findByTypeWithName(type); 112 } 113 114 public static <T> Map<String, T> lookupByType(BlueprintContainer blueprintContainer, Class<T> type) { 115 return lookupByType(blueprintContainer, type, true); 116 } 117 118 public static <T> Map<String, T> lookupByType(BlueprintContainer blueprintContainer, Class<T> type, boolean includeNonSingletons) { 119 Bundle bundle = (Bundle) blueprintContainer.getComponentInstance("blueprintBundle"); 120 Map<String, T> objects = new LinkedHashMap<>(); 121 Set<String> ids = blueprintContainer.getComponentIds(); 122 for (String id : ids) { 123 try { 124 ComponentMetadata metadata = blueprintContainer.getComponentMetadata(id); 125 Class<?> cl = null; 126 if (metadata instanceof BeanMetadata) { 127 BeanMetadata beanMetadata = (BeanMetadata)metadata; 128 // should we skip the bean if its prototype and we are only looking for singletons? 129 if (!includeNonSingletons) { 130 String scope = beanMetadata.getScope(); 131 if (BeanMetadata.SCOPE_PROTOTYPE.equals(scope)) { 132 continue; 133 } 134 } 135 cl = bundle.loadClass(beanMetadata.getClassName()); 136 } else if (metadata instanceof ReferenceMetadata) { 137 ReferenceMetadata referenceMetadata = (ReferenceMetadata)metadata; 138 cl = bundle.loadClass(referenceMetadata.getInterface()); 139 } 140 if (cl != null && type.isAssignableFrom(cl)) { 141 Object o = blueprintContainer.getComponentInstance(metadata.getId()); 142 objects.put(metadata.getId(), type.cast(o)); 143 } 144 } catch (Throwable t) { 145 // ignore 146 } 147 } 148 return objects; 149 } 150}