11.finishBeanFactoryInitialization
finishBeanFactoryInitialization方法做了兩件事：
1.beanFactory對象的初始化；
2.bean配置文件中配置的那些單例的bean，都是在finishBeanFactoryInitialization方法中實例化的；
//對配置了lazy-init屬性的Bean進行預實例化處理
protected void finishBeanFactoryInitialization(ConfigurableListableBeanFactory beanFactory) {
// Initialize conversion service for this context.
//這是Spring3以後新加的代碼，爲容器指定一個轉換服務(ConversionService)
//在對某些Bean屬性進行轉換時使用
// 實例化類型轉換的bean，並保存在ApplicationContext中
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));
}
// Register a default embedded value resolver if no bean post-processor
// (such as a PropertyPlaceholderConfigurer bean) registered any before:
// at this point, primarily for resolution in annotation attribute values.
if (!beanFactory.hasEmbeddedValueResolver()) {
beanFactory.addEmbeddedValueResolver(strVal -> getEnvironment().resolvePlaceholders(strVal));
}
// Initialize LoadTimeWeaverAware beans early to allow for registering their transformers early.
// 實例化LoadTimeWeaverAware接口的bean，用於ApsectJ的類加載期織入的處理
String[] weaverAwareNames = beanFactory.getBeanNamesForType(LoadTimeWeaverAware.class, false, false);
for (String weaverAwareName : weaverAwareNames) {
getBean(weaverAwareName);
}
// Stop using the temporary ClassLoader for type matching.
//爲了類型匹配，停止使用臨時的類加載器
// 確保臨時的classLoader爲空，臨時classLoader一般被用來做類型匹配的
beanFactory.setTempClassLoader(null);
// Allow for caching all bean definition metadata, not expecting further changes.
//緩存容器中所有註冊的BeanDefinition元數據，以防被修改
// 將一個標誌設置爲true，表示applicationContext已經緩存了所有bean的定義，這些bean的name都被保存在applicationContext的frozenBeanDefinitionNames成員變量中，相當於一個快照，記錄了當前那些bean的定義已經拿到了
beanFactory.freezeConfiguration();
// Instantiate all remaining (non-lazy-init) singletons.
//對配置了lazy-init屬性的單態模式Bean進行預實例化處理
beanFactory.preInstantiateSingletons();
}
preInstantiateSingletons
public void preInstantiateSingletons() throws BeansException {
if (this.logger.isDebugEnabled()) {
this.logger.debug("Pre-instantiating singletons in " + this);
}
// Iterate over a copy to allow for init methods which in turn register new bean definitions.
// While this may not be part of the regular factory bootstrap, it does otherwise work fine.
List<String> beanNames = new ArrayList<>(this.beanDefinitionNames);
// Trigger initialization of all non-lazy singleton beans...
for (String beanName : beanNames) {
//獲取指定名稱的Bean定義,該定義已經和父類定義做了合併
RootBeanDefinition bd = getMergedLocalBeanDefinition(beanName);
//Bean不是抽象的，是單態模式的，且lazy-init屬性配置爲false
if (!bd.isAbstract() && bd.isSingleton() && !bd.isLazyInit()) {
//如果指定名稱的bean是創建容器的Bean
if (isFactoryBean(beanName)) {
//FACTORY_BEAN_PREFIX=”&”，當Bean名稱前面加”&”符號
//時，獲取的是產生容器對象本身，而不是容器產生的Bean.
//調用getBean方法，觸發容器對Bean實例化和依賴注入過程
final FactoryBean<?> factory = (FactoryBean<?>) getBean(FACTORY_BEAN_PREFIX + beanName);
//標識是否需要預實例化
boolean isEagerInit;
if (System.getSecurityManager() != null && factory instanceof SmartFactoryBean) {
//一個匿名內部類
isEagerInit = AccessController.doPrivileged((PrivilegedAction<Boolean>) () ->
((SmartFactoryBean<?>) factory).isEagerInit(),
getAccessControlContext());
}
else {
isEagerInit = (factory instanceof SmartFactoryBean &&
((SmartFactoryBean<?>) factory).isEagerInit());
}
if (isEagerInit) {
//調用getBean方法，觸發容器對Bean實例化和依賴注入過程
getBean(beanName);
}
}
else {
getBean(beanName);
}
}
}
// Trigger post-initialization callback for all applicable beans...
for (String beanName : beanNames) {
Object singletonInstance = getSingleton(beanName);
if (singletonInstance instanceof SmartInitializingSingleton) {
final SmartInitializingSingleton smartSingleton = (SmartInitializingSingleton) singletonInstance;
if (System.getSecurityManager() != null) {
AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
smartSingleton.afterSingletonsInstantiated();
return null;
}, getAccessControlContext());
}
else {
smartSingleton.afterSingletonsInstantiated();
}
}
}
}
//獲取IOC容器中指定名稱的Bean
@Override
public Object getBean(String name) throws BeansException {
//doGetBean纔是真正向IoC容器獲取被管理Bean的過程
return doGetBean(name, null, null, false);
}
//真正實現向IOC容器獲取Bean的功能，也是觸發依賴注入功能的地方
protected <T> T doGetBean(final String name, @Nullable final Class<T> requiredType,
@Nullable final Object[] args, boolean typeCheckOnly) throws BeansException {
//根據指定的名稱獲取被管理Bean的名稱，剝離指定名稱中對容器的相關依賴
//如果指定的是別名，將別名轉換爲規範的Bean名稱
final String beanName = transformedBeanName(name);
Object bean;
// Eagerly check singleton cache for manually registered singletons.
//先從緩存中取是否已經有被創建過的單態類型的Bean
//對於單例模式的Bean整個IOC容器中只創建一次，不需要重複創建
Object sharedInstance = getSingleton(beanName);
//IOC容器創建單例模式Bean實例對象
if (sharedInstance != null && args == null) {
if (logger.isDebugEnabled()) {
//如果指定名稱的Bean在容器中已有單例模式的Bean被創建
//直接返回已經創建的Bean
if (isSingletonCurrentlyInCreation(beanName)) {
logger.debug("Returning eagerly cached instance of singleton bean '" + beanName +
"' that is not fully initialized yet - a consequence of a circular reference");
}
else {
logger.debug("Returning cached instance of singleton bean '" + beanName + "'");
}
}
//獲取給定Bean的實例對象，主要是完成FactoryBean的相關處理
//注意：BeanFactory是管理容器中Bean的工廠，而FactoryBean是
//創建創建對象的工廠Bean，兩者之間有區別
bean = getObjectForBeanInstance(sharedInstance, name, beanName, null);
}
else {
// Fail if we're already creating this bean instance:
// We're assumably within a circular reference.
//緩存沒有正在創建的單例模式Bean
//緩存中已經有已經創建的原型模式Bean
//但是由於循環引用的問題導致實例化對象失敗
if (isPrototypeCurrentlyInCreation(beanName)) {
throw new BeanCurrentlyInCreationException(beanName);
}
// Check if bean definition exists in this factory.
//對IOC容器中是否存在指定名稱的BeanDefinition進行檢查，首先檢查是否
//能在當前的BeanFactory中獲取的所需要的Bean，如果不能則委託當前容器
//的父級容器去查找，如果還是找不到則沿着容器的繼承體系向父級容器查找
BeanFactory parentBeanFactory = getParentBeanFactory();
//當前容器的父級容器存在，且當前容器中不存在指定名稱的Bean
if (parentBeanFactory != null && !containsBeanDefinition(beanName)) {
// Not found -> check parent.
//解析指定Bean名稱的原始名稱
String nameToLookup = originalBeanName(name);
if (parentBeanFactory instanceof AbstractBeanFactory) {
return ((AbstractBeanFactory) parentBeanFactory).doGetBean(
nameToLookup, requiredType, args, typeCheckOnly);
}
else if (args != null) {
// Delegation to parent with explicit args.
//委派父級容器根據指定名稱和顯式的參數查找
return (T) parentBeanFactory.getBean(nameToLookup, args);
}
else {
// No args -> delegate to standard getBean method.
//委派父級容器根據指定名稱和類型查找
return parentBeanFactory.getBean(nameToLookup, requiredType);
}
}
//創建的Bean是否需要進行類型驗證，一般不需要
if (!typeCheckOnly) {
//向容器標記指定的Bean已經被創建
markBeanAsCreated(beanName);
}
try {
//根據指定Bean名稱獲取其父級的Bean定義
//主要解決Bean繼承時子類合併父類公共屬性問題
final RootBeanDefinition mbd = getMergedLocalBeanDefinition(beanName);
checkMergedBeanDefinition(mbd, beanName, args);
// Guarantee initialization of beans that the current bean depends on.
//獲取當前Bean所有依賴Bean的名稱
String[] dependsOn = mbd.getDependsOn();
//如果當前Bean有依賴Bean
if (dependsOn != null) {
for (String dep : dependsOn) {
if (isDependent(beanName, dep)) {
throw new BeanCreationException(mbd.getResourceDescription(), beanName,
"Circular depends-on relationship between '" + beanName + "' and '" + dep + "'");
}
//遞歸調用getBean方法，獲取當前Bean的依賴Bean
registerDependentBean(dep, beanName);
//把被依賴Bean註冊給當前依賴的Bean
getBean(dep);
}
}
// Create bean instance.
//創建單例模式Bean的實例對象
if (mbd.isSingleton()) {
//這裏使用了一個匿名內部類，創建Bean實例對象，並且註冊給所依賴的對象
sharedInstance = getSingleton(beanName, () -> {
try {
//創建一個指定Bean實例對象，如果有父級繼承，則合併子類和父類的定義
return createBean(beanName, mbd, args);
}
catch (BeansException ex) {
// Explicitly remove instance from singleton cache: It might have been put there
// eagerly by the creation process, to allow for circular reference resolution.
// Also remove any beans that received a temporary reference to the bean.
//顯式地從容器單例模式Bean緩存中清除實例對象
destroySingleton(beanName);
throw ex;
}
});
//獲取給定Bean的實例對象
bean = getObjectForBeanInstance(sharedInstance, name, beanName, mbd);
}
//IOC容器創建原型模式Bean實例對象
else if (mbd.isPrototype()) {
// It's a prototype -> create a new instance.
//原型模式(Prototype)是每次都會創建一個新的對象
Object prototypeInstance = null;
try {
//回調beforePrototypeCreation方法，默認的功能是註冊當前創建的原型對象
beforePrototypeCreation(beanName);
//創建指定Bean對象實例
prototypeInstance = createBean(beanName, mbd, args);
}
finally {
//回調afterPrototypeCreation方法，默認的功能告訴IOC容器指定Bean的原型對象不再創建
afterPrototypeCreation(beanName);
}
//獲取給定Bean的實例對象
bean = getObjectForBeanInstance(prototypeInstance, name, beanName, mbd);
}
//要創建的Bean既不是單例模式，也不是原型模式，則根據Bean定義資源中
//配置的生命週期範圍，選擇實例化Bean的合適方法，這種在Web應用程序中
//比較常用，如：request、session、application等生命週期
else {
String scopeName = mbd.getScope();
final Scope scope = this.scopes.get(scopeName);
//Bean定義資源中沒有配置生命週期範圍，則Bean定義不合法
if (scope == null) {
throw new IllegalStateException("No Scope registered for scope name '" + scopeName + "'");
}
try {
//這裏又使用了一個匿名內部類，獲取一個指定生命週期範圍的實例
Object scopedInstance = scope.get(beanName, () -> {
beforePrototypeCreation(beanName);
try {
return createBean(beanName, mbd, args);
}
finally {
afterPrototypeCreation(beanName);
}
});
//獲取給定Bean的實例對象
bean = getObjectForBeanInstance(scopedInstance, name, beanName, mbd);
}
catch (IllegalStateException ex) {
throw new BeanCreationException(beanName,
"Scope '" + scopeName + "' is not active for the current thread; consider " +
"defining a scoped proxy for this bean if you intend to refer to it from a singleton",
ex);
}
}
}
catch (BeansException ex) {
cleanupAfterBeanCreationFailure(beanName);
throw ex;
}
}
// Check if required type matches the type of the actual bean instance.
//對創建的Bean實例對象進行類型檢查
if (requiredType != null && !requiredType.isInstance(bean)) {
try {
T convertedBean = getTypeConverter().convertIfNecessary(bean, requiredType);
if (convertedBean == null) {
throw new BeanNotOfRequiredTypeException(name, requiredType, bean.getClass());
}
return convertedBean;
}
catch (TypeMismatchException ex) {
if (logger.isDebugEnabled()) {
logger.debug("Failed to convert bean '" + name + "' to required type '" +
ClassUtils.getQualifiedName(requiredType) + "'", ex);
}
throw new BeanNotOfRequiredTypeException(name, requiredType, bean.getClass());
}
}
return (T) bean;
}
//創建Bean實例對象
@Override
protected Object createBean(String beanName, RootBeanDefinition mbd, @Nullable Object[] args)
throws BeanCreationException {
if (logger.isDebugEnabled()) {
logger.debug("Creating instance of bean '" + beanName + "'");
}
RootBeanDefinition mbdToUse = mbd;
// Make sure bean class is actually resolved at this point, and
// clone the bean definition in case of a dynamically resolved Class
// which cannot be stored in the shared merged bean definition.
//判斷需要創建的Bean是否可以實例化，即是否可以通過當前的類加載器加載
Class<?> resolvedClass = resolveBeanClass(mbd, beanName);
if (resolvedClass != null && !mbd.hasBeanClass() && mbd.getBeanClassName() != null) {
mbdToUse = new RootBeanDefinition(mbd);
mbdToUse.setBeanClass(resolvedClass);
}
// Prepare method overrides.
//校驗和準備Bean中的方法覆蓋
try {
mbdToUse.prepareMethodOverrides();
}
catch (BeanDefinitionValidationException ex) {
throw new BeanDefinitionStoreException(mbdToUse.getResourceDescription(),
beanName, "Validation of method overrides failed", ex);
}
try {
// Give BeanPostProcessors a chance to return a proxy instead of the target bean instance.
//如果Bean配置了初始化前和初始化後的處理器，則試圖返回一個需要創建Bean的代理對象
Object bean = resolveBeforeInstantiation(beanName, mbdToUse);
if (bean != null) {
return bean;
}
}
catch (Throwable ex) {
throw new BeanCreationException(mbdToUse.getResourceDescription(), beanName,
"BeanPostProcessor before instantiation of bean failed", ex);
}
try {
//創建Bean的入口
Object beanInstance = doCreateBean(beanName, mbdToUse, args);
if (logger.isDebugEnabled()) {
logger.debug("Finished creating instance of bean '" + beanName + "'");
}
return beanInstance;
}
catch (BeanCreationException ex) {
// A previously detected exception with proper bean creation context already...
throw ex;
}
catch (ImplicitlyAppearedSingletonException ex) {
// An IllegalStateException to be communicated up to DefaultSingletonBeanRegistry...
throw ex;
}
catch (Throwable ex) {
throw new BeanCreationException(
mbdToUse.getResourceDescription(), beanName, "Unexpected exception during bean creation", ex);
}
}
//真正創建Bean的方法
protected Object doCreateBean(final String beanName, final RootBeanDefinition mbd, final @Nullable Object[] args)
throws BeanCreationException {
// Instantiate the bean.
//封裝被創建的Bean對象
BeanWrapper instanceWrapper = null;
if (mbd.isSingleton()) {
instanceWrapper = this.factoryBeanInstanceCache.remove(beanName);
}
if (instanceWrapper == null) {
instanceWrapper = createBeanInstance(beanName, mbd, args);
}
final Object bean = instanceWrapper.getWrappedInstance();
//獲取實例化對象的類型
Class<?> beanType = instanceWrapper.getWrappedClass();
if (beanType != NullBean.class) {
mbd.resolvedTargetType = beanType;
}
// Allow post-processors to modify the merged bean definition.
//調用PostProcessor後置處理器
synchronized (mbd.postProcessingLock) {
if (!mbd.postProcessed) {
try {
applyMergedBeanDefinitionPostProcessors(mbd, beanType, beanName);
}
catch (Throwable ex) {
throw new BeanCreationException(mbd.getResourceDescription(), beanName,
"Post-processing of merged bean definition failed", ex);
}
mbd.postProcessed = true;
}
}
// Eagerly cache singletons to be able to resolve circular references
// even when triggered by lifecycle interfaces like BeanFactoryAware.
//向容器中緩存單例模式的Bean對象，以防循環引用
boolean earlySingletonExposure = (mbd.isSingleton() && this.allowCircularReferences &&
isSingletonCurrentlyInCreation(beanName));
if (earlySingletonExposure) {
if (logger.isDebugEnabled()) {
logger.debug("Eagerly caching bean '" + beanName +
"' to allow for resolving potential circular references");
}
//這裏是一個匿名內部類，爲了防止循環引用，儘早持有對象的引用
addSingletonFactory(beanName, () -> getEarlyBeanReference(beanName, mbd, bean));
}
// Initialize the bean instance.
//Bean對象的初始化，依賴注入在此觸發
//這個exposedObject在初始化完成之後返回作爲依賴注入完成後的Bean
Object exposedObject = bean;
try {
//將Bean實例對象封裝，並且Bean定義中配置的屬性值賦值給實例對象
populateBean(beanName, mbd, instanceWrapper);
//初始化Bean對象
exposedObject = initializeBean(beanName, exposedObject, mbd);
}
catch (Throwable ex) {
if (ex instanceof BeanCreationException && beanName.equals(((BeanCreationException) ex).getBeanName())) {
throw (BeanCreationException) ex;
}
else {
throw new BeanCreationException(
mbd.getResourceDescription(), beanName, "Initialization of bean failed", ex);
}
}
if (earlySingletonExposure) {
//獲取指定名稱的已註冊的單例模式Bean對象
Object earlySingletonReference = getSingleton(beanName, false);
if (earlySingletonReference != null) {
//根據名稱獲取的已註冊的Bean和正在實例化的Bean是同一個
if (exposedObject == bean) {
//當前實例化的Bean初始化完成
exposedObject = earlySingletonReference;
}
//當前Bean依賴其他Bean，並且當發生循環引用時不允許新創建實例對象
else if (!this.allowRawInjectionDespiteWrapping && hasDependentBean(beanName)) {
String[] dependentBeans = getDependentBeans(beanName);
Set<String> actualDependentBeans = new LinkedHashSet<>(dependentBeans.length);
//獲取當前Bean所依賴的其他Bean
for (String dependentBean : dependentBeans) {
//對依賴Bean進行類型檢查
if (!removeSingletonIfCreatedForTypeCheckOnly(dependentBean)) {
actualDependentBeans.add(dependentBean);
}
}
if (!actualDependentBeans.isEmpty()) {
throw new BeanCurrentlyInCreationException(beanName,
"Bean with name '" + beanName + "' has been injected into other beans [" +
StringUtils.collectionToCommaDelimitedString(actualDependentBeans) +
"] in its raw version as part of a circular reference, but has eventually been " +
"wrapped. This means that said other beans do not use the final version of the " +
"bean. This is often the result of over-eager type matching - consider using " +
"'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example.");
}
}
}
}
// Register bean as disposable.
//註冊完成依賴注入的Bean
try {
registerDisposableBeanIfNecessary(beanName, bean, mbd);
}
catch (BeanDefinitionValidationException ex) {
throw new BeanCreationException(
mbd.getResourceDescription(), beanName, "Invalid destruction signature", ex);
}
return exposedObject;
}
//將Bean屬性設置到生成的實例對象上
protected void populateBean(String beanName, RootBeanDefinition mbd, @Nullable BeanWrapper bw) {
if (bw == null) {
if (mbd.hasPropertyValues()) {
throw new BeanCreationException(
mbd.getResourceDescription(), beanName, "Cannot apply property values to null instance");
}
else {
// Skip property population phase for null instance.
return;
}
}
// Give any InstantiationAwareBeanPostProcessors the opportunity to modify the
// state of the bean before properties are set. This can be used, for example,
// to support styles of field injection.
boolean continueWithPropertyPopulation = true;
if (!mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof InstantiationAwareBeanPostProcessor) {
InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor) bp;
if (!ibp.postProcessAfterInstantiation(bw.getWrappedInstance(), beanName)) {
continueWithPropertyPopulation = false;
break;
}
}
}
}
if (!continueWithPropertyPopulation) {
return;
}
//獲取容器在解析Bean定義資源時爲BeanDefiniton中設置的屬性值
PropertyValues pvs = (mbd.hasPropertyValues() ? mbd.getPropertyValues() : null);
//對依賴注入處理，首先處理autowiring自動裝配的依賴注入
if (mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_BY_NAME ||
mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_BY_TYPE) {
MutablePropertyValues newPvs = new MutablePropertyValues(pvs);
// Add property values based on autowire by name if applicable.
//根據Bean名稱進行autowiring自動裝配處理
if (mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_BY_NAME) {
autowireByName(beanName, mbd, bw, newPvs);
}
// Add property values based on autowire by type if applicable.
//根據Bean類型進行autowiring自動裝配處理
if (mbd.getResolvedAutowireMode() == RootBeanDefinition.AUTOWIRE_BY_TYPE) {
autowireByType(beanName, mbd, bw, newPvs);
}
pvs = newPvs;
}
//對非autowiring的屬性進行依賴注入處理
boolean hasInstAwareBpps = hasInstantiationAwareBeanPostProcessors();
boolean needsDepCheck = (mbd.getDependencyCheck() != RootBeanDefinition.DEPENDENCY_CHECK_NONE);
if (hasInstAwareBpps || needsDepCheck) {
if (pvs == null) {
pvs = mbd.getPropertyValues();
}
PropertyDescriptor[] filteredPds = filterPropertyDescriptorsForDependencyCheck(bw, mbd.allowCaching);
if (hasInstAwareBpps) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof InstantiationAwareBeanPostProcessor) {
InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor) bp;
pvs = ibp.postProcessPropertyValues(pvs, filteredPds, bw.getWrappedInstance(), beanName);
if (pvs == null) {
return;
}
}
}
}
if (needsDepCheck) {
checkDependencies(beanName, mbd, filteredPds, pvs);
}
}
if (pvs != null) {
//對屬性進行注入
applyPropertyValues(beanName, mbd, bw, pvs);
}
}
initializeBean
//初始容器創建的Bean實例對象，爲其添加BeanPostProcessor後置處理器
protected Object initializeBean(final String beanName, final Object bean, @Nullable RootBeanDefinition mbd) {
//JDK的安全機制驗證權限
if (System.getSecurityManager() != null) {
//實現PrivilegedAction接口的匿名內部類
AccessController.doPrivileged((PrivilegedAction<Object>) () -> {
invokeAwareMethods(beanName, bean);
return null;
}, getAccessControlContext());
}
else {
//爲Bean實例對象包裝相關屬性，如名稱，類加載器，所屬容器等信息
invokeAwareMethods(beanName, bean);
}
Object wrappedBean = bean;
//對BeanPostProcessor後置處理器的postProcessBeforeInitialization
//回調方法的調用，爲Bean實例初始化前做一些處理
if (mbd == null || !mbd.isSynthetic()) {
wrappedBean = applyBeanPostProcessorsBeforeInitialization(wrappedBean, beanName);
}
//調用Bean實例對象初始化的方法，這個初始化方法是在Spring Bean定義配置
//文件中通過init-method屬性指定的
try {
invokeInitMethods(beanName, wrappedBean, mbd);
}
catch (Throwable ex) {
throw new BeanCreationException(
(mbd != null ? mbd.getResourceDescription() : null),
beanName, "Invocation of init method failed", ex);
}
//對BeanPostProcessor後置處理器的postProcessAfterInitialization
//回調方法的調用，爲Bean實例初始化之後做一些處理
if (mbd == null || !mbd.isSynthetic()) {
wrappedBean = applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName);
}
return wrappedBean;
}
private void invokeAwareMethods(final String beanName, final Object bean) {
if (bean instanceof Aware) {
if (bean instanceof BeanNameAware) {
((BeanNameAware) bean).setBeanName(beanName);
}
if (bean instanceof BeanClassLoaderAware) {
ClassLoader bcl = getBeanClassLoader();
if (bcl != null) {
((BeanClassLoaderAware) bean).setBeanClassLoader(bcl);
}
}
if (bean instanceof BeanFactoryAware) {
((BeanFactoryAware) bean).setBeanFactory(AbstractAutowireCapableBeanFactory.this);
}
}
}
protected void invokeInitMethods(String beanName, final Object bean, @Nullable RootBeanDefinition mbd)
throws Throwable {
boolean isInitializingBean = (bean instanceof InitializingBean);
if (isInitializingBean && (mbd == null || !mbd.isExternallyManagedInitMethod("afterPropertiesSet"))) {
if (logger.isDebugEnabled()) {
logger.debug("Invoking afterPropertiesSet() on bean with name '" + beanName + "'");
}
if (System.getSecurityManager() != null) {
try {
AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () -> {
((InitializingBean) bean).afterPropertiesSet();
return null;
}, getAccessControlContext());
}
catch (PrivilegedActionException pae) {
throw pae.getException();
}
}
else {
((InitializingBean) bean).afterPropertiesSet();
}
}
if (mbd != null && bean.getClass() != NullBean.class) {
String initMethodName = mbd.getInitMethodName();
if (StringUtils.hasLength(initMethodName) &&
!(isInitializingBean && "afterPropertiesSet".equals(initMethodName)) &&
!mbd.isExternallyManagedInitMethod(initMethodName)) {
invokeCustomInitMethod(beanName, bean, mbd);
}
}
}
12.finishRefresh
protected void finishRefresh() {
// Clear context-level resource caches (such as ASM metadata from scanning).
clearResourceCaches();
// Initialize lifecycle processor for this context.
// 檢查是否已經配置了生命週期處理器，如果沒有就new一個DefaultLifecycleProcessor
initLifecycleProcessor();
// Propagate refresh to lifecycle processor first.
// 找到所有實現了Lifecycle接口的bean，按照每個bean設置的生命週期階段進行分組，再依次調用每個分組中每個bean的start方法，完成生命週期監聽的通知
getLifecycleProcessor().onRefresh();
// Publish the final event.
// 創建一條代表applicationContext刷新完成的事件，交給廣播器去廣播
publishEvent(new ContextRefreshedEvent(this));
// Participate in LiveBeansView MBean, if active.
// 如果配置了MBeanServer，就完成在MBeanServer上的註冊
LiveBeansView.registerApplicationContext(this);
}
