001/* 002 * Copyright 2012-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.boot.context.properties; 018 019import java.lang.annotation.Annotation; 020import java.lang.reflect.Method; 021import java.util.HashMap; 022import java.util.Map; 023import java.util.concurrent.atomic.AtomicReference; 024 025import org.springframework.beans.BeansException; 026import org.springframework.beans.factory.config.BeanDefinition; 027import org.springframework.beans.factory.config.BeanFactoryPostProcessor; 028import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; 029import org.springframework.core.annotation.AnnotationUtils; 030import org.springframework.util.ClassUtils; 031import org.springframework.util.ReflectionUtils; 032 033/** 034 * Utility class to memorize {@code @Bean} definition meta data during initialization of 035 * the bean factory. 036 * 037 * @author Dave Syer 038 * @since 1.1.0 039 */ 040public class ConfigurationBeanFactoryMetadata implements BeanFactoryPostProcessor { 041 042 /** 043 * The bean name that this class is registered with. 044 */ 045 public static final String BEAN_NAME = ConfigurationBeanFactoryMetadata.class 046 .getName(); 047 048 private ConfigurableListableBeanFactory beanFactory; 049 050 private final Map<String, FactoryMetadata> beansFactoryMetadata = new HashMap<>(); 051 052 @Override 053 public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) 054 throws BeansException { 055 this.beanFactory = beanFactory; 056 for (String name : beanFactory.getBeanDefinitionNames()) { 057 BeanDefinition definition = beanFactory.getBeanDefinition(name); 058 String method = definition.getFactoryMethodName(); 059 String bean = definition.getFactoryBeanName(); 060 if (method != null && bean != null) { 061 this.beansFactoryMetadata.put(name, new FactoryMetadata(bean, method)); 062 } 063 } 064 } 065 066 public <A extends Annotation> Map<String, Object> getBeansWithFactoryAnnotation( 067 Class<A> type) { 068 Map<String, Object> result = new HashMap<>(); 069 for (String name : this.beansFactoryMetadata.keySet()) { 070 if (findFactoryAnnotation(name, type) != null) { 071 result.put(name, this.beanFactory.getBean(name)); 072 } 073 } 074 return result; 075 } 076 077 public <A extends Annotation> A findFactoryAnnotation(String beanName, 078 Class<A> type) { 079 Method method = findFactoryMethod(beanName); 080 return (method != null) ? AnnotationUtils.findAnnotation(method, type) : null; 081 } 082 083 public Method findFactoryMethod(String beanName) { 084 if (!this.beansFactoryMetadata.containsKey(beanName)) { 085 return null; 086 } 087 AtomicReference<Method> found = new AtomicReference<>(null); 088 FactoryMetadata metadata = this.beansFactoryMetadata.get(beanName); 089 Class<?> factoryType = this.beanFactory.getType(metadata.getBean()); 090 String factoryMethod = metadata.getMethod(); 091 if (ClassUtils.isCglibProxyClass(factoryType)) { 092 factoryType = factoryType.getSuperclass(); 093 } 094 ReflectionUtils.doWithMethods(factoryType, (method) -> { 095 if (method.getName().equals(factoryMethod)) { 096 found.compareAndSet(null, method); 097 } 098 }); 099 return found.get(); 100 } 101 102 private static class FactoryMetadata { 103 104 private final String bean; 105 106 private final String method; 107 108 FactoryMetadata(String bean, String method) { 109 this.bean = bean; 110 this.method = method; 111 } 112 113 public String getBean() { 114 return this.bean; 115 } 116 117 public String getMethod() { 118 return this.method; 119 } 120 121 } 122 123}