成人在线亚洲_国产日韩视频一区二区三区_久久久国产精品_99国内精品久久久久久久

您的位置:首頁(yè)技術(shù)文章
文章詳情頁(yè)

Spring教程之refresh()執(zhí)行邏輯淺析

瀏覽:51日期:2023-08-17 16:19:01

前言

對(duì)于AbstractApplicationContex#refresh()方法邏輯,可所謂是貫通spring框架核心邏輯,溪源在debug過(guò)程中,理解起來(lái)也是懵懵懂懂,自己也買(mǎi)了《Spring源碼深度解析》書(shū)籍學(xué)習(xí)其思想和實(shí)現(xiàn)邏輯,經(jīng)過(guò)不斷的整理學(xué)習(xí)總結(jié),最終誕生這篇文章,方便后面自己忘記了查看和理解。

下面開(kāi)始正式踏入refresh方法的整體概覽淺析。

概覽

refresh

該方法是 Spring Bean 加載的核心,它是 ClassPathXmlApplicationContext 的父類(lèi) AbstractApplicationContext 的一個(gè)方法 , 顧名思義,用于刷新整個(gè)Spring 上下文信息,定義了整個(gè) Spring 上下文加載的流程。先看下refresh()方法總體:

@Overridepublic void refresh() throws BeansException, IllegalStateException { synchronized (this.startupShutdownMonitor) { // 準(zhǔn)備預(yù)處理:記錄容器的啟動(dòng)時(shí)間startupDate, 標(biāo)記容器為激活,初始化上下文環(huán)境如文件路徑信息,驗(yàn)證必填屬性是否填寫(xiě) this.prepareRefresh(); // **告訴子類(lèi)去刷新bean工廠,此方法解析配置文件并將bean信息存儲(chǔ)到beanDefinition中,注冊(cè)到BeanFactory(但是未被初始化,僅將信息寫(xiě)到了beanDefination的map中)**重點(diǎn)方法,下面的操作都基于這個(gè)beanFactory進(jìn)行的 ConfigurableListableBeanFactory beanFactory = this.obtainFreshBeanFactory(); // 設(shè)置beanFactory的基本屬性:類(lèi)加載器,添加多個(gè)beanPostProcesser this.prepareBeanFactory(beanFactory); try { // 空實(shí)現(xiàn):允許子類(lèi)上下文中對(duì)beanFactory做后期處理 this.postProcessBeanFactory(beanFactory); /**************************以上是BeanFactory的創(chuàng)建及預(yù)準(zhǔn)備工作 ****************/ // 調(diào)用BeanFactoryPostProcessor各個(gè)實(shí)現(xiàn)類(lèi)的方法 this.invokeBeanFactoryPostProcessors(beanFactory); // 注冊(cè) BeanPostProcessor 的實(shí)現(xiàn)類(lèi),注意看和 BeanFactoryPostProcessor 的區(qū)別 // 此接口兩個(gè)方法: postProcessBeforeInitialization 和 postProcessAfterInitialization // 兩個(gè)方法分別在 Bean 初始化之前和初始化之后得到執(zhí)行。注意,到這里 Bean 還沒(méi)初始化 this.registerBeanPostProcessors(beanFactory); //初始化ApplicationContext的MessageSource組件(資源文件),如國(guó)際化文件,消息解析,綁定等 this.initMessageSource(); //初始化ApplicationContext事件廣播器 this.initApplicationEventMulticaster(); // 初始化子類(lèi)特殊bean(鉤子方法) this.onRefresh(); // 獲取所有的事件監(jiān)聽(tīng)器,并將監(jiān)聽(tīng)器注冊(cè)到事件廣播器 this.registerListeners(); //** 初始化所有singleton bean;**重點(diǎn)方法 this.finishBeanFactoryInitialization(beanFactory); // 廣播事件:ApplicationContext初始化完成 this.finishRefresh();} catch (BeansException ex) {if (logger.isWarnEnabled()) {logger.warn('Exception encountered during context initialization - ' + 'cancelling refresh attempt: ' + ex);}// 銷(xiāo)毀beanthis.destroyBeans();// 重置 ’active’ 標(biāo)志.this.cancelRefresh(ex);throw ex;}}

明細(xì)

本篇文章,不會(huì)仔細(xì)往下探討源碼實(shí)現(xiàn)邏輯,先總結(jié)refresh()方法具體邏輯:

1.prepareRefresh

準(zhǔn)備預(yù)處理:記錄spring容器的啟動(dòng)時(shí)間startupDate, 標(biāo)記容器為激活,初始化上下文環(huán)境如文件路徑信息,驗(yàn)證必填屬性是否填寫(xiě)。

initPropertySources():初始化一些屬性設(shè)置;子類(lèi)自定義個(gè)性化的屬性設(shè)置方法; getEnvironment().validateRequiredProperties():檢驗(yàn)屬性的合法等; earlyApplicationEvents= new LinkedHashSet():保存容器中的一些早期的事件;

//刷新前的預(yù)處理;protected void prepareRefresh() { this.startupDate = System.currentTimeMillis(); this.closed.set(false); this.active.set(true);​ if (logger.isInfoEnabled()) { logger.info('Refreshing ' + this); } // 初始化一些屬性設(shè)置;子類(lèi)自定義個(gè)性化的屬性設(shè)置方法; initPropertySources(); // 校驗(yàn)配置文件的屬性,合法性 getEnvironment().validateRequiredProperties(); //保存容器中的一些事件 this.earlyApplicationEvents = new LinkedHashSet<ApplicationEvent>();}

2.obtainFreshBeanFactory

獲取BeanFactory,解析配置文件,生成beanDefinition;

protected ConfigurableListableBeanFactory obtainFreshBeanFactory() { refreshBeanFactory(); //創(chuàng)建了一個(gè)this.beanFactory = new DefaultListableBeanFactory();設(shè)置了序列化的ID //返回剛才創(chuàng)建的DefaultListableBeanFactory ConfigurableListableBeanFactory beanFactory = getBeanFactory(); if (logger.isDebugEnabled()) { logger.debug('Bean factory for ' + getDisplayName() + ': ' + beanFactory); } return beanFactory;}

3.prepareBeanFactory

該方法主要負(fù)責(zé)對(duì)BeanFactory的預(yù)準(zhǔn)備工作,配置beanFactory的基礎(chǔ)屬性,比如ClassLoader和一些PostProcessor等。這個(gè)方法主要是給BeanFactory設(shè)置一些基本的屬性,比如類(lèi)加載器、表達(dá)式解析器、屬性編輯器,注冊(cè)幾個(gè)單例、添加一些不用注入的接口、添加解析依賴項(xiàng)等。

設(shè)置BeanFactory的類(lèi)加載器、支持表達(dá)式解析器… 添加部分BeanPostProcessor【ApplicationContextAwareProcessor】 設(shè)置忽略的自動(dòng)裝配的接口EnvironmentAware、EmbeddedValueResolverAware、xxx; 注冊(cè)可以解析的自動(dòng)裝配;我們能直接在任何組件中自動(dòng)注入: BeanFactory、ResourceLoader、ApplicationEventPublisher、ApplicationContext 添加BeanPostProcessor【ApplicationListenerDetector】 添加編譯時(shí)的AspectJ; 給BeanFactory中注冊(cè)一些能用的組件; environment【ConfigurableEnvironment】、 systemProperties【Map<String, Object>】、 systemEnvironment【Map<String, Object>】

protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) { // Tell the internal bean factory to use the context’s class loader etc. //設(shè)置類(lèi)加載器 beanFactory.setBeanClassLoader(getClassLoader()); //設(shè)置bean表達(dá)式解析器,詳解見(jiàn)下文 beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver()); //資源編輯注冊(cè)器 beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment())); //添加一個(gè)BeanPostProcessor:ApplicationContextAwareProcessor,用于向?qū)崿F(xiàn)類(lèi)ApplitionContextAware中,調(diào)用setApplicationContext方法,并將ApplicationContext作為參數(shù)。 beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this)); //添加忽略自動(dòng)裝配的接口 beanFactory.ignoreDependencyInterface(EnvironmentAware.class); beanFactory.ignoreDependencyInterface(EmbeddedValueResolverAware.class); beanFactory.ignoreDependencyInterface(ResourceLoaderAware.class); beanFactory.ignoreDependencyInterface(ApplicationEventPublisherAware.class); beanFactory.ignoreDependencyInterface(MessageSourceAware.class); beanFactory.ignoreDependencyInterface(ApplicationContextAware.class); // 注冊(cè)幾個(gè)解析依賴項(xiàng),意思是,當(dāng)一個(gè)Bean需要注入對(duì)應(yīng)的類(lèi)時(shí),使用下面注冊(cè)的這些類(lèi) //比如,如果@Autowire 一個(gè)BeanFactory,那么這個(gè)BeanFactory實(shí)際就是在此處注冊(cè)的一個(gè)對(duì)象 //這幾項(xiàng)分別是:BeanFactory、ResourceLoader、ApplicationEventPublisher、ApplicationContext beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory); beanFactory.registerResolvableDependency(ResourceLoader.class, this); beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this); beanFactory.registerResolvableDependency(ApplicationContext.class, this); // Detect a LoadTimeWeaver and prepare for weaving, if found. //檢查是否由LoadTimeWeaver,如果有l(wèi)oadTimeWeaver的bean,就放入一個(gè)BeanPostProcessor:LoadTimeWeaverAwareProcessor if (beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME)) { beanFactory.addBeanPostProcessor(new LoadTimeWeaverAwareProcessor(beanFactory)); // Set a temporary ClassLoader for type matching. beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader())); } // 注冊(cè)environment,注冊(cè)成單例 if (!beanFactory.containsLocalBean(ENVIRONMENT_BEAN_NAME)) { beanFactory.registerSingleton(ENVIRONMENT_BEAN_NAME, getEnvironment()); } //注冊(cè)systemProperties 成單例 if (!beanFactory.containsLocalBean(SYSTEM_PROPERTIES_BEAN_NAME)) { beanFactory.registerSingleton(SYSTEM_PROPERTIES_BEAN_NAME, getEnvironment().getSystemProperties()); } //注冊(cè) systemEnvironment 成單例 if (!beanFactory.containsLocalBean(SYSTEM_ENVIRONMENT_BEAN_NAME)) { beanFactory.registerSingleton(SYSTEM_ENVIRONMENT_BEAN_NAME, getEnvironment().getSystemEnvironment()); } }

4.postProcessBeanFactory

主要負(fù)責(zé)在BeanFactory準(zhǔn)備工作完成之后,beanFactory的后置處理工作;

protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) { }

5. invokeBeanFactoryPostProcessors

protected void invokeBeanFactoryPostProcessors(ConfigurableListableBeanFactory beanFactory) { // Invoke BeanDefinitionRegistryPostProcessors first, if any. //用于存放已處理過(guò)的Bean Set<String> processedBeans = new HashSet<String>(); //如果IOC容器是一個(gè)BeanDefinitionRegistry,有了注冊(cè)BeanDefinition的能力,就可以執(zhí)行BeanDefinitionRegistryPostProcessor的postProcessBeanDefinitionRegistry方法 if (beanFactory instanceof BeanDefinitionRegistry) { BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory; //regularPostProcessors用于存放普通的BeanFactoryPostProcessor List<BeanFactoryPostProcessor> regularPostProcessors = new LinkedList<BeanFactoryPostProcessor>(); //registryPostProcessors用于存放 BeanDefinitionRegistryPostProcessor List<BeanDefinitionRegistryPostProcessor> registryPostProcessors = new LinkedList<BeanDefinitionRegistryPostProcessor>(); //查詢通過(guò)addBeanFactoryPostProcessor等方法設(shè)置進(jìn)來(lái)的的BeanFactoryPostProcessor(不是注冊(cè)到IOC容器的中) for (BeanFactoryPostProcessor postProcessor : getBeanFactoryPostProcessors()) { //如果是 BeanDefinitionRegistryPostProcessor , //就先執(zhí)行它的postProcessBeanDefinitionRegistry,用于向IOC中注冊(cè)一些BeanDefinition, //然后添加到registryPostProcessors隊(duì)列中 if (postProcessor instanceof BeanDefinitionRegistryPostProcessor) { BeanDefinitionRegistryPostProcessor registryPostProcessor = (BeanDefinitionRegistryPostProcessor) postProcessor; registryPostProcessor.postProcessBeanDefinitionRegistry(registry); registryPostProcessors.add(registryPostProcessor); } else { //如果是普通的BeanFactoryPostProcessor,就添加到regularPostProcessors隊(duì)列中 regularPostProcessors.add(postProcessor); } } //獲取IOC容器中注冊(cè)的BeanDefinitionRegistryPostProcessor, //放入到registryPostProcessorBeans中, //并按照Order排序 Map<String, BeanDefinitionRegistryPostProcessor> beanMap = beanFactory.getBeansOfType(BeanDefinitionRegistryPostProcessor.class, true, false); List<BeanDefinitionRegistryPostProcessor> registryPostProcessorBeans = new ArrayList<BeanDefinitionRegistryPostProcessor>(beanMap.values()); OrderComparator.sort(registryPostProcessorBeans); //先調(diào)用registryPostProcessorBeans中的所有postProcessBeanDefinitionRegistry方法 for (BeanDefinitionRegistryPostProcessor postProcessor : registryPostProcessorBeans) { postProcessor.postProcessBeanDefinitionRegistry(registry); } //先調(diào)用 registryPostProcessors中的postProcessBeanFactory方法 //再調(diào)用 registryPostProcessorBeans中的postProcessBeanFactory方法 //最后調(diào)用 regularPostProcessors中的postProcessBeanFactory方法 invokeBeanFactoryPostProcessors(registryPostProcessors, beanFactory); invokeBeanFactoryPostProcessors(registryPostProcessorBeans, beanFactory); invokeBeanFactoryPostProcessors(regularPostProcessors, beanFactory); //對(duì)于IOC容器中注冊(cè)的BeanDefinitionRegistryPostProcessor來(lái)說(shuō),還要放置到processedBeans中,放置重復(fù)調(diào)用 processedBeans.addAll(beanMap.keySet()); } else { //如果IOC就是一個(gè)普通的BeanFacotry,就直接從context中取出所有的BeanFactoryPostProcessor,并調(diào)用他們的postProcessBeanFactory方法 // Invoke factory processors registered with the context instance. invokeBeanFactoryPostProcessors(getBeanFactoryPostProcessors(), beanFactory); } // Do not initialize FactoryBeans here: We need to leave all regular beans // 查詢IOC容器中所有的BeanFactoryPostProcessor,有可能上面的BeanDefinitionRegistryPostProcessor剛剛向IOC容器中注冊(cè)了一些BeanFactoryPostProcessor,所以要在此處全部查出來(lái)。 String[] postProcessorNames = beanFactory.getBeanNamesForType(BeanFactoryPostProcessor.class, true, false); // 按照 這些BeanFactoryPostProcessor實(shí)現(xiàn)的排序接口( PriorityOrdered 和 Ordered)分成3組 //第一組 實(shí)現(xiàn)了PriorityOrdered --- priorityOrderedPostProcessors //第二組 實(shí)現(xiàn)了Ordered --- orderedPostProcessorNames //第三組 沒(méi)有實(shí)現(xiàn)排序接口 --- nonOrderedPostProcessorNames List<BeanFactoryPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>(); List<String> orderedPostProcessorNames = new ArrayList<String>(); List<String> nonOrderedPostProcessorNames = new ArrayList<String>(); for (String ppName : postProcessorNames) { //如果已經(jīng)處理了,就跳過(guò) if (processedBeans.contains(ppName)) { // skip - already processed in first phase above } //實(shí)現(xiàn)PriorityOrdered 接口的 else if (isTypeMatch(ppName, PriorityOrdered.class)) { priorityOrderedPostProcessors.add(beanFactory.getBean(ppName, BeanFactoryPostProcessor.class)); } // 實(shí)現(xiàn)Ordered 接口的 else if (isTypeMatch(ppName, Ordered.class)) { orderedPostProcessorNames.add(ppName); } //普通的 else { nonOrderedPostProcessorNames.add(ppName); } } //然后先執(zhí)行priorityOrderedPostProcessors中的,再執(zhí)行orderedPostProcessorNames的,最后執(zhí)行nonOrderedPostProcessorNames //排序并執(zhí)行priorityOrderedPostProcessors的 OrderComparator.sort(priorityOrderedPostProcessors); invokeBeanFactoryPostProcessors(priorityOrderedPostProcessors, beanFactory); // 排序并執(zhí)行orderedPostProcessors的 List<BeanFactoryPostProcessor> orderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>(); for (String postProcessorName : orderedPostProcessorNames) { orderedPostProcessors.add(getBean(postProcessorName, BeanFactoryPostProcessor.class)); } OrderComparator.sort(orderedPostProcessors); invokeBeanFactoryPostProcessors(orderedPostProcessors, beanFactory); // 最后執(zhí)行普通的BeanFactoryPostProcessor的 List<BeanFactoryPostProcessor> nonOrderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>(); for (String postProcessorName : nonOrderedPostProcessorNames) { nonOrderedPostProcessors.add(getBean(postProcessorName, BeanFactoryPostProcessor.class)); } invokeBeanFactoryPostProcessors(nonOrderedPostProcessors, beanFactory);}

6.registerBeanPostProcessors

protected void registerBeanPostProcessors(ConfigurableListableBeanFactory beanFactory) { // 獲取IOC中注冊(cè)的 BeanPostProcessor String[] postProcessorNames = beanFactory.getBeanNamesForType(BeanPostProcessor.class, true, false); // BeanPostProcessorChecker 也是一個(gè) BeanPostProcessor,用于檢查一個(gè)Bean應(yīng)該經(jīng)過(guò)的BeanPostProcessor和 int beanProcessorTargetCount = beanFactory.getBeanPostProcessorCount() + 1 + postProcessorNames.length; beanFactory.addBeanPostProcessor(new BeanPostProcessorChecker(beanFactory, beanProcessorTargetCount)); //按照排序接口分類(lèi)。 //這里需要注意的是,priorityOrderedPostProcessors里面裝的是BeanPostProcessor //而orderedPostProcessorNames和nonOrderedPostProcessorNames里面裝的是BeanPostProcessor的name //原因是:實(shí)例化BeanPostProcessor實(shí)現(xiàn)類(lèi)的時(shí)候,也需要調(diào)用IOC中已有的BeanPostProcessor,所以Spring這里沒(méi)有提前實(shí)例化Orderd接口和普通的BeanPostProcessor。 //因此,這里有一個(gè)有趣的現(xiàn)象,示例化Orderd接口的BeanProcessor的時(shí)候,會(huì)使用PriorityOrdered的BeanPostProcessor進(jìn)行處理 //實(shí)例化普通的BeanProcessor時(shí),會(huì)先后經(jīng)過(guò)PriorityOrdered和Orderd接口的BeanPostProcessor的處理 List<BeanPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanPostProcessor>(); List<BeanPostProcessor> internalPostProcessors = new ArrayList<BeanPostProcessor>(); List<String> orderedPostProcessorNames = new ArrayList<String>(); List<String> nonOrderedPostProcessorNames = new ArrayList<String>(); //分類(lèi) for (String ppName : postProcessorNames) { //PriorityOrdered接口的,先行實(shí)例化,并把MergedBeanDefinitionPostProcessor放入到internalPostProcessors中 if (isTypeMatch(ppName, PriorityOrdered.class)) { BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class); priorityOrderedPostProcessors.add(pp); // if (pp instanceof MergedBeanDefinitionPostProcessor) { internalPostProcessors.add(pp); } } //Ordered接口的,這里只是把name記錄下來(lái)。 else if (isTypeMatch(ppName, Ordered.class)) { // orderedPostProcessorNames.add(ppName); } //普通的,這里只是把name記錄下來(lái)。 else { nonOrderedPostProcessorNames.add(ppName); } } //排序并注冊(cè)PriorityOrdered接口的BeanPostProcessor OrderComparator.sort(priorityOrderedPostProcessors); registerBeanPostProcessors(beanFactory, priorityOrderedPostProcessors); //排序并注冊(cè)O(shè)rdered接口的BeanPostProcessor List<BeanPostProcessor> orderedPostProcessors = new ArrayList<BeanPostProcessor>(); for (String ppName : orderedPostProcessorNames) { //這里才進(jìn)行實(shí)例化,所以會(huì)使用實(shí)現(xiàn)了PriorityOrdered接口的BeanPostProcessor進(jìn)行處理 BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class); orderedPostProcessors.add(pp); //把MergedBeanDefinitionPostProcessor放入到internalPostProcessors中 if (pp instanceof MergedBeanDefinitionPostProcessor) { internalPostProcessors.add(pp); } } OrderComparator.sort(orderedPostProcessors); registerBeanPostProcessors(beanFactory, orderedPostProcessors); // 注冊(cè)普通的BeanPostProcessor List<BeanPostProcessor> nonOrderedPostProcessors = new ArrayList<BeanPostProcessor>(); for (String ppName : nonOrderedPostProcessorNames) { //這里才進(jìn)行實(shí)例化,所以會(huì)使用實(shí)現(xiàn)了PriorityOrdered接口或Orderd的BeanPostProcessor進(jìn)行處理 BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class); nonOrderedPostProcessors.add(pp); //把 MergedBeanDefinitionPostProcessor 放入到internalPostProcessors中 //同時(shí)注意到,即使在internalPostProcessors中 //BeanPostProcessor的順序也是按照 PriorityOrderd > Orderd > 普通 的順序進(jìn)入的。 if (pp instanceof MergedBeanDefinitionPostProcessor) { internalPostProcessors.add(pp); } } registerBeanPostProcessors(beanFactory, nonOrderedPostProcessors); //注冊(cè)所有的MergedBeanDefinitionPostProcessor OrderComparator.sort(internalPostProcessors); registerBeanPostProcessors(beanFactory, internalPostProcessors); //最后,在末尾添加一個(gè)ApplicationListenerDetector beanFactory.addBeanPostProcessor(new ApplicationListenerDetector());}

7.initMessageSource

初始化MessageSource組件(做國(guó)際化功能;消息綁定,消息解析);

獲取BeanFactory 判斷容器中是否有id為messageSource的,類(lèi)型是MessageSource的組件; 如果有賦值給messageSource,如果沒(méi)有自己創(chuàng)建一個(gè)DelegatingMessageSource; MessageSource:取出國(guó)際化配置文件中的某個(gè)key的值;能按照區(qū)域信息獲取; 將創(chuàng)建完成的MessageSource注冊(cè)在容器中,以后獲取國(guó)際化配置文件的值的時(shí)候,可以自動(dòng)注入MessageSource;

protected void initMessageSource() { ConfigurableListableBeanFactory beanFactory = getBeanFactory(); if (beanFactory.containsLocalBean(MESSAGE_SOURCE_BEAN_NAME)) { this.messageSource = beanFactory.getBean(MESSAGE_SOURCE_BEAN_NAME, MessageSource.class); // Make MessageSource aware of parent MessageSource. //如果已經(jīng)注冊(cè)了 messageSource && messageSource是HierarchicalMessageSource && messageSource沒(méi)有parent && 此IOC有parent if (this.parent != null && this.messageSource instanceof HierarchicalMessageSource) { HierarchicalMessageSource hms = (HierarchicalMessageSource) this.messageSource; if (hms.getParentMessageSource() == null) { // Only set parent context as parent MessageSource if no parent MessageSource // registered already. hms.setParentMessageSource(getInternalParentMessageSource()); } } if (logger.isDebugEnabled()) { logger.debug('Using MessageSource [' + this.messageSource + ']'); } } //如果沒(méi)有注冊(cè)messageSource,就創(chuàng)建一個(gè)DelegatingMessageSource,并注冊(cè)到IOC中 else { // Use empty MessageSource to be able to accept getMessage calls. DelegatingMessageSource dms = new DelegatingMessageSource(); dms.setParentMessageSource(getInternalParentMessageSource()); this.messageSource = dms; beanFactory.registerSingleton(MESSAGE_SOURCE_BEAN_NAME, this.messageSource); if (logger.isDebugEnabled()) { logger.debug('Unable to locate MessageSource with name ’' + MESSAGE_SOURCE_BEAN_NAME + '’: using default [' + this.messageSource + ']'); } }}

8.initApplicationEventMulticaster

protected void initApplicationEventMulticaster() { ConfigurableListableBeanFactory beanFactory = getBeanFactory(); //如果有開(kāi)發(fā)自定的applicationEventMulticaster實(shí)例bean,則設(shè)置IOC的事件廣播器為該實(shí)例 if (beanFactory.containsLocalBean(APPLICATION_EVENT_MULTICASTER_BEAN_NAME)) { this.applicationEventMulticaster = beanFactory.getBean(APPLICATION_EVENT_MULTICASTER_BEAN_NAME, ApplicationEventMulticaster.class); if (logger.isDebugEnabled()) { logger.debug('Using ApplicationEventMulticaster [' + this.applicationEventMulticaster + ']'); } } //如果沒(méi)有applicationEventMulticaster,就設(shè)置一個(gè)SimpleApplicationEventMulticaster else { this.applicationEventMulticaster = new SimpleApplicationEventMulticaster(beanFactory); beanFactory.registerSingleton(APPLICATION_EVENT_MULTICASTER_BEAN_NAME, this.applicationEventMulticaster); if (logger.isDebugEnabled()) { logger.debug('Unable to locate ApplicationEventMulticaster with name ’' + APPLICATION_EVENT_MULTICASTER_BEAN_NAME + '’: using default [' + this.applicationEventMulticaster + ']'); } }}

9.onRefresh

模板設(shè)計(jì)模式;該方法屬于鉤子方法;子類(lèi)重寫(xiě)該方法并在容器刷新的時(shí)候自定義邏輯;

protected void onRefresh() throws BeansException {// For subclasses: do nothing by default.}

10.registerListeners

注冊(cè)監(jiān)聽(tīng)器分為兩部分:

向事件分發(fā)器注冊(cè)硬編碼設(shè)置的applicationListener 向事件分發(fā)器注冊(cè)一個(gè)IOC中的事件監(jiān)聽(tīng)器(并不實(shí)例化)

protected void registerListeners() { // 查出所有通過(guò)addApplicationListener方法添加的ApplicationListener,然后注冊(cè)到事件廣播器上 for (ApplicationListener<?> listener : getApplicationListeners()) { getApplicationEventMulticaster().addApplicationListener(listener); } // 查出ioc容器中的所有ApplicationListener,只把他們注冊(cè)到事件分發(fā)器的ApplicationListenerBean上, // 待使用時(shí)再進(jìn)行實(shí)例化 String[] listenerBeanNames = getBeanNamesForType(ApplicationListener.class, true, false); for (String listenerBeanName : listenerBeanNames) { getApplicationEventMulticaster().addApplicationListenerBean(listenerBeanName); }}

11.finishBeanFactoryInitialization

finishBeanFactoryInitialization主要是負(fù)責(zé)初始化單實(shí)例的bean;該方法是重點(diǎn)方法,bean的生命周期基本調(diào)用getBean()方法完成。

protected void finishBeanFactoryInitialization(ConfigurableListableBeanFactory beanFactory) { //如果IOC中有conversionService的話,就實(shí)例化并設(shè)置到IOC中 //conversionService用于類(lèi)型轉(zhuǎn)換 if (beanFactory.containsBean(CONVERSION_SERVICE_BEAN_NAME) && beanFactory.isTypeMatch(CONVERSION_SERVICE_BEAN_NAME, ConversionService.class)) { beanFactory.setConversionService( beanFactory.getBean(CONVERSION_SERVICE_BEAN_NAME, ConversionService.class)); } // 如果有LoadTimeWeaverAware,就實(shí)例化 String[] weaverAwareNames = beanFactory.getBeanNamesForType(LoadTimeWeaverAware.class, false, false); for (String weaverAwareName : weaverAwareNames) { getBean(weaverAwareName); } // 清理臨時(shí)的classLoader beanFactory.setTempClassLoader(null); // 緩存所有beanDefinition的name,以備不時(shí)之需 beanFactory.freezeConfiguration(); // 實(shí)例化所有非non-lazy-init的單例 beanFactory.preInstantiateSingletons();}

12.finishRefresh

完成bean創(chuàng)建和初始化過(guò)程,通知生命周期處理器 lifecycleProcessor 刷新過(guò)程,同時(shí)發(fā)出 ContextRefreshEvent 通知。

protected void finishRefresh() { // 實(shí)例化或初始化lifecycleProcessor initLifecycleProcessor(); // 調(diào)用lifecycleProcessor的刷新方法 getLifecycleProcessor().onRefresh(); //發(fā)布一個(gè)ContextRefreshedEvent事件 publishEvent(new ContextRefreshedEvent(this)); // 注冊(cè)MBean,用于JMX管理 LiveBeansView.registerApplicationContext(this);}

參考資料:

解讀Spring容器的refresh() Spring 源碼深度解析 Spring IoC之ApplicationContext中refresh過(guò)程

總結(jié)

到此這篇關(guān)于Spring教程之refresh()執(zhí)行邏輯的文章就介紹到這了,更多相關(guān)Spring refresh()執(zhí)行邏輯內(nèi)容請(qǐng)搜索好吧啦網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持好吧啦網(wǎng)!

標(biāo)簽: Spring
相關(guān)文章: