spring源码分析
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一、首先分析AliasRegistry接口。
1、Alias别名,Registry注册表,AliasRegistry别名注册表接口。
2、共有四个方法,注册别名,判断是否别名,获取别名数组,移除别名。
3、我自己试着写了一个这个接口的实现类:
package com.lzh.spring.test; import java.util.ArrayList; import java.util.Hashtable; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Map.Entry; import org.springframework.core.AliasRegistry; /** * 别名注册表接口的实现 * @author LiaoZhengHan * @date 2018年8月29日 */ public class MyAliasRegistry implements AliasRegistry{ private Map<String, String> aliasMap = new Hashtable<>(); @Override public void registerAlias(String name, String alias) { if (isAlias(alias)) { throw new IllegalStateException(); } aliasMap.put(alias, name); } @Override public void removeAlias(String alias) { aliasMap.remove(alias); } @Override public boolean isAlias(String name) { return aliasMap.containsKey(name); } @Override public String[] getAliases(String name) { List<String> aliases = new ArrayList<>(); Iterator<Entry<String, String>> it = aliasMap.entrySet().iterator(); Entry<String, String> entry = null; while (it.hasNext()) { entry = it.next(); if (entry.getValue().equals(name)) { aliases.add(entry.getKey()); } } String[] array = new String[aliases.size()]; return aliases.toArray(array); } }
/* * Copyright 2002-2012 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.core; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; import org.springframework.util.Assert; import org.springframework.util.StringUtils; import org.springframework.util.StringValueResolver; /** * Simple implementation of the {@link AliasRegistry} interface. * Serves as base class for * {@link org.springframework.beans.factory.support.BeanDefinitionRegistry} * implementations. * * @author Juergen Hoeller * @since 2.5.2 */ public class SimpleAliasRegistry implements AliasRegistry { /** Map from alias to canonical name */ private final Map<String, String> aliasMap = new ConcurrentHashMap<String, String>(16); @Override public void registerAlias(String name, String alias) { Assert.hasText(name, "\'name\' must not be empty"); Assert.hasText(alias, "\'alias\' must not be empty"); if (alias.equals(name)) { this.aliasMap.remove(alias); } else { if (!allowAliasOverriding()) { String registeredName = this.aliasMap.get(alias); if (registeredName != null && !registeredName.equals(name)) { throw new IllegalStateException("Cannot register alias \'" + alias + "\' for name \'" + name + "\': It is already registered for name \'" + registeredName + "\'."); } } checkForAliasCircle(name, alias); this.aliasMap.put(alias, name); } } /** * Return whether alias overriding is allowed. * Default is {@code true}. */ protected boolean allowAliasOverriding() { return true; } @Override public void removeAlias(String alias) { String name = this.aliasMap.remove(alias); if (name == null) { throw new IllegalStateException("No alias \'" + alias + "\' registered"); } } @Override public boolean isAlias(String name) { return this.aliasMap.containsKey(name); } @Override public String[] getAliases(String name) { List<String> result = new ArrayList<String>(); synchronized (this.aliasMap) { retrieveAliases(name, result); } return StringUtils.toStringArray(result); } /** * Transitively retrieve all aliases for the given name. * @param name the target name to find aliases for * @param result the resulting aliases list */ private void retrieveAliases(String name, List<String> result) { for (Map.Entry<String, String> entry : this.aliasMap.entrySet()) { String registeredName = entry.getValue(); if (registeredName.equals(name)) { String alias = entry.getKey(); result.add(alias); retrieveAliases(alias, result); } } } /** * Resolve all alias target names and aliases registered in this * factory, applying the given StringValueResolver to them. * <p>The value resolver may for example resolve placeholders * in target bean names and even in alias names. * @param valueResolver the StringValueResolver to apply */ public void resolveAliases(StringValueResolver valueResolver) { Assert.notNull(valueResolver, "StringValueResolver must not be null"); synchronized (this.aliasMap) { Map<String, String> aliasCopy = new HashMap<String, String>(this.aliasMap); for (String alias : aliasCopy.keySet()) { String registeredName = aliasCopy.get(alias); String resolvedAlias = valueResolver.resolveStringValue(alias); String resolvedName = valueResolver.resolveStringValue(registeredName); if (resolvedAlias.equals(resolvedName)) { this.aliasMap.remove(alias); } else if (!resolvedAlias.equals(alias)) { String existingName = this.aliasMap.get(resolvedAlias); if (existingName != null && !existingName.equals(resolvedName)) { throw new IllegalStateException( "Cannot register resolved alias \'" + resolvedAlias + "\' (original: \'" + alias + "\') for name \'" + resolvedName + "\': It is already registered for name \'" + registeredName + "\'."); } checkForAliasCircle(resolvedName, resolvedAlias); this.aliasMap.remove(alias); this.aliasMap.put(resolvedAlias, resolvedName); } else if (!registeredName.equals(resolvedName)) { this.aliasMap.put(alias, resolvedName); } } } } /** * Determine the raw name, resolving aliases to canonical names. * @param name the user-specified name * @return the transformed name */ public String canonicalName(String name) { String canonicalName = name; // Handle aliasing... String resolvedName; do { resolvedName = this.aliasMap.get(canonicalName); if (resolvedName != null) { canonicalName = resolvedName; } } while (resolvedName != null); return canonicalName; } /** * Check whether the given name points back to given alias as an alias * in the other direction, catching a circular reference upfront and * throwing a corresponding IllegalStateException. * @param name the candidate name * @param alias the candidate alias * @see #registerAlias */ protected void checkForAliasCircle(String name, String alias) { if (alias.equals(canonicalName(name))) { throw new IllegalStateException("Cannot register alias \'" + alias + "\' for name \'" + name + "\': Circular reference - \'" + name + "\' is a direct or indirect alias for \'" + alias + "\' already"); } } }
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