除了Spring 学习记录5 BeanFactory 里写的几个接口外,BeanFactory的实现类还实现了一些其他接口,这篇文章主要介绍这些接口和实现类.
结构
DefaultListableBeanFactory和它的父类们除了实现了BF的各种接口以外还实现了AliasRegistry和BeanDefinitionRegistry接口.而且不同等级的父类和BF的相关接口都有交集..
AliasRegistry
这个接口根据说明来看意思是提供别名注册的服务.虽然没有实际使用过别名,不过1个bean确实可以有N个别名.
1 /* 2 * Copyright 2002-2008 the original author or authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package org.springframework.core; 18 19 /** 20 * Common interface for managing aliases. Serves as super-interface for 21 * {@link org.springframework.beans.factory.support.BeanDefinitionRegistry}. 22 * 23 * @author Juergen Hoeller 24 * @since 2.5.2 25 */ 26 public interface AliasRegistry { 27 28 /** 29 * Given a name, register an alias for it. 30 * @param name the canonical name 31 * @param alias the alias to be registered 32 * @throws IllegalStateException if the alias is already in use 33 * and may not be overridden 34 */ 35 void registerAlias(String name, String alias); 36 37 /** 38 * Remove the specified alias from this registry. 39 * @param alias the alias to remove 40 * @throws IllegalStateException if no such alias was found 41 */ 42 void removeAlias(String alias); 43 44 /** 45 * Determine whether this given name is defines as an alias 46 * (as opposed to the name of an actually registered component). 47 * @param beanName the bean name to check 48 * @return whether the given name is an alias 49 */ 50 boolean isAlias(String beanName); 51 52 /** 53 * Return the aliases for the given name, if defined. 54 * @param name the name to check for aliases 55 * @return the aliases, or an empty array if none 56 */ 57 String[] getAliases(String name); 58 59 }