下面列出了怎么用org.springframework.beans.factory.config.BeanPostProcessor的API类实例代码及写法，或者点击链接到github查看源代码。
/**
* Search for all DestructionAwareBeanPostProcessors in the List.
* @param processors the List to search
* @return the filtered List of DestructionAwareBeanPostProcessors
*/
@Nullable
private List<DestructionAwareBeanPostProcessor> filterPostProcessors(List<BeanPostProcessor> processors, Object bean) {
List<DestructionAwareBeanPostProcessor> filteredPostProcessors = null;
if (!CollectionUtils.isEmpty(processors)) {
filteredPostProcessors = new ArrayList<>(processors.size());
for (BeanPostProcessor processor : processors) {
if (processor instanceof DestructionAwareBeanPostProcessor) {
DestructionAwareBeanPostProcessor dabpp = (DestructionAwareBeanPostProcessor) processor;
if (dabpp.requiresDestruction(bean)) {
filteredPostProcessors.add(dabpp);
}
}
}
}
return filteredPostProcessors;
}
@Override
@Nullable
protected Class<?> predictBeanType(String beanName, RootBeanDefinition mbd, Class<?>... typesToMatch) {
Class<?> targetType = determineTargetType(beanName, mbd, typesToMatch);
// Apply SmartInstantiationAwareBeanPostProcessors to predict the
// eventual type after a before-instantiation shortcut.
if (targetType != null && !mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
Class<?> predicted = ibp.predictBeanType(targetType, beanName);
if (predicted != null && (typesToMatch.length != 1 || FactoryBean.class != typesToMatch[0] ||
FactoryBean.class.isAssignableFrom(predicted))) {
return predicted;
}
}
}
}
return targetType;
}
/**
* Determine candidate constructors to use for the given bean, checking all registered
* {@link SmartInstantiationAwareBeanPostProcessor SmartInstantiationAwareBeanPostProcessors}.
* @param beanClass the raw class of the bean
* @param beanName the name of the bean
* @return the candidate constructors, or {@code null} if none specified
* @throws org.springframework.beans.BeansException in case of errors
* @see org.springframework.beans.factory.config.SmartInstantiationAwareBeanPostProcessor#determineCandidateConstructors
*/
@Nullable
protected Constructor<?>[] determineConstructorsFromBeanPostProcessors(@Nullable Class<?> beanClass, String beanName)
throws BeansException {
if (beanClass != null && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
Constructor<?>[] ctors = ibp.determineCandidateConstructors(beanClass, beanName);
if (ctors != null) {
return ctors;
}
}
}
}
return null;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) {
if (!(beanFactory instanceof ConfigurableBeanFactory)) {
throw new IllegalStateException("ScriptFactoryPostProcessor doesn't work with a BeanFactory "
+ "which does not implement ConfigurableBeanFactory: " + beanFactory.getClass());
}
this.beanFactory = (ConfigurableBeanFactory) beanFactory;
// Required so that references (up container hierarchies) are correctly resolved.
this.scriptBeanFactory.setParentBeanFactory(this.beanFactory);
// Required so that all BeanPostProcessors, Scopes, etc become available.
this.scriptBeanFactory.copyConfigurationFrom(this.beanFactory);
// Filter out BeanPostProcessors that are part of the AOP infrastructure,
// since those are only meant to apply to beans defined in the original factory.
for (Iterator<BeanPostProcessor> it = this.scriptBeanFactory.getBeanPostProcessors().iterator(); it.hasNext();) {
if (it.next() instanceof AopInfrastructureBean) {
it.remove();
}
}
}
/**
* Search for all DestructionAwareBeanPostProcessors in the List.
* @param processors the List to search
* @return the filtered List of DestructionAwareBeanPostProcessors
*/
@Nullable
private List<DestructionAwareBeanPostProcessor> filterPostProcessors(List<BeanPostProcessor> processors, Object bean) {
List<DestructionAwareBeanPostProcessor> filteredPostProcessors = null;
if (!CollectionUtils.isEmpty(processors)) {
filteredPostProcessors = new ArrayList<>(processors.size());
for (BeanPostProcessor processor : processors) {
if (processor instanceof DestructionAwareBeanPostProcessor) {
DestructionAwareBeanPostProcessor dabpp = (DestructionAwareBeanPostProcessor) processor;
if (dabpp.requiresDestruction(bean)) {
filteredPostProcessors.add(dabpp);
}
}
}
}
return filteredPostProcessors;
}
@Override
@Nullable
protected Class<?> predictBeanType(String beanName, RootBeanDefinition mbd, Class<?>... typesToMatch) {
Class<?> targetType = determineTargetType(beanName, mbd, typesToMatch);
// Apply SmartInstantiationAwareBeanPostProcessors to predict the
// eventual type after a before-instantiation shortcut.
if (targetType != null && !mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
Class<?> predicted = ibp.predictBeanType(targetType, beanName);
if (predicted != null && (typesToMatch.length != 1 || FactoryBean.class != typesToMatch[0] ||
FactoryBean.class.isAssignableFrom(predicted))) {
return predicted;
}
}
}
}
return targetType;
}
@Override
public void customizeContext(ConfigurableApplicationContext context, MergedContextConfiguration mergedConfig) {
BeanDefinitionRegistry registry = getRegistry(context);
EmbeddedCassandra annotation = this.annotation;
Resource[] resources = getResources(annotation, context);
Charset charset = Charset.forName(annotation.encoding());
CqlDataSet dataSet = CqlDataSet.ofResources(charset, resources);
registerCassandraBeanDefinition(annotation.exposeProperties(), context, registry);
registerCassandraConnectionBeanDefinition(context, registry);
registerCassandraInitializerBeanDefinition(dataSet, context, registry);
context.getBeanFactory().addBeanPostProcessor(new BeanPostProcessor() {
private final AtomicBoolean initialized = new AtomicBoolean();
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof Cassandra && this.initialized.compareAndSet(false, true)) {
context.getBean(CassandraInitializer.class);
}
return bean;
}
});
}
@Override
public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) {
GenericBeanDefinition beanPostProcessorDefinition = new GenericBeanDefinition();
beanPostProcessorDefinition.setInstanceSupplier(()->this);
beanPostProcessorDefinition.setBeanClass(BeanPostProcessor.class);
registry.registerBeanDefinition("NettyRpcClientBeanPostProcessor",beanPostProcessorDefinition);
ClassPathScanningCandidateComponentProvider scanner = getScanner();
scanner.setResourceLoader(resourceLoader);
scanner.addIncludeFilter(new AnnotationTypeFilter(NettyRpcClient.class));
Map<String, Object> enableNettyRpcClientsAttributes = metadata.getAnnotationAttributes(enableNettyRpcClientsCanonicalName);
for (String basePackage : getBasePackages(metadata,enableNettyRpcClientsAttributes)) {
for (BeanDefinition candidateComponent : scanner.findCandidateComponents(basePackage)) {
if (!(candidateComponent instanceof AnnotatedBeanDefinition)) {
continue;
}
AnnotatedBeanDefinition beanDefinition = (AnnotatedBeanDefinition) candidateComponent;
if(!beanDefinition.getMetadata().isInterface()) {
throw new IllegalArgumentException("@NettyRpcClient can only be specified on an interface");
}
registerNettyRpcClient(beanDefinition,registry);
}
}
}
@Override
public void setBeanFactory(BeanFactory beanFactory) {
if (!(beanFactory instanceof ConfigurableBeanFactory)) {
throw new IllegalStateException("ScriptFactoryPostProcessor doesn't work with " +
"non-ConfigurableBeanFactory: " + beanFactory.getClass());
}
this.beanFactory = (ConfigurableBeanFactory) beanFactory;
// Required so that references (up container hierarchies) are correctly resolved.
this.scriptBeanFactory.setParentBeanFactory(this.beanFactory);
// Required so that all BeanPostProcessors, Scopes, etc become available.
this.scriptBeanFactory.copyConfigurationFrom(this.beanFactory);
// Filter out BeanPostProcessors that are part of the AOP infrastructure,
// since those are only meant to apply to beans defined in the original factory.
for (Iterator<BeanPostProcessor> it = this.scriptBeanFactory.getBeanPostProcessors().iterator(); it.hasNext();) {
if (it.next() instanceof AopInfrastructureBean) {
it.remove();
}
}
}
/**
* Search for all DestructionAwareBeanPostProcessors in the List.
* @param processors the List to search
* @return the filtered List of DestructionAwareBeanPostProcessors
*/
private List<DestructionAwareBeanPostProcessor> filterPostProcessors(List<BeanPostProcessor> processors, Object bean) {
List<DestructionAwareBeanPostProcessor> filteredPostProcessors = null;
if (!CollectionUtils.isEmpty(processors)) {
filteredPostProcessors = new ArrayList<DestructionAwareBeanPostProcessor>(processors.size());
for (BeanPostProcessor processor : processors) {
if (processor instanceof DestructionAwareBeanPostProcessor) {
DestructionAwareBeanPostProcessor dabpp = (DestructionAwareBeanPostProcessor) processor;
try {
if (dabpp.requiresDestruction(bean)) {
filteredPostProcessors.add(dabpp);
}
}
catch (AbstractMethodError err) {
// A pre-4.3 third-party DestructionAwareBeanPostProcessor...
// As of 5.0, we can let requiresDestruction be a Java 8 default method which returns true.
filteredPostProcessors.add(dabpp);
}
}
}
}
return filteredPostProcessors;
}
/**
* Check whether the given bean has destruction-aware post-processors applying to it.
* @param bean the bean instance
* @param postProcessors the post-processor candidates
*/
public static boolean hasApplicableProcessors(Object bean, List<BeanPostProcessor> postProcessors) {
if (!CollectionUtils.isEmpty(postProcessors)) {
for (BeanPostProcessor processor : postProcessors) {
if (processor instanceof DestructionAwareBeanPostProcessor) {
DestructionAwareBeanPostProcessor dabpp = (DestructionAwareBeanPostProcessor) processor;
try {
if (dabpp.requiresDestruction(bean)) {
return true;
}
}
catch (AbstractMethodError err) {
// A pre-4.3 third-party DestructionAwareBeanPostProcessor...
// As of 5.0, we can let requiresDestruction be a Java 8 default method which returns true.
return true;
}
}
}
}
return false;
}
@Override
protected Class<?> predictBeanType(String beanName, RootBeanDefinition mbd, Class<?>... typesToMatch) {
Class<?> targetType = determineTargetType(beanName, mbd, typesToMatch);
// Apply SmartInstantiationAwareBeanPostProcessors to predict the
// eventual type after a before-instantiation shortcut.
if (targetType != null && !mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
Class<?> predicted = ibp.predictBeanType(targetType, beanName);
if (predicted != null && (typesToMatch.length != 1 || FactoryBean.class != typesToMatch[0] ||
FactoryBean.class.isAssignableFrom(predicted))) {
return predicted;
}
}
}
}
return targetType;
}
/**
* Obtain a reference for early access to the specified bean,
* typically for the purpose of resolving a circular reference.
* @param beanName the name of the bean (for error handling purposes)
* @param mbd the merged bean definition for the bean
* @param bean the raw bean instance
* @return the object to expose as bean reference
*/
protected Object getEarlyBeanReference(String beanName, RootBeanDefinition mbd, Object bean) {
Object exposedObject = bean;
if (bean != null && !mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
exposedObject = ibp.getEarlyBeanReference(exposedObject, beanName);
if (exposedObject == null) {
return null;
}
}
}
}
return exposedObject;
}
/**
* Determine candidate constructors to use for the given bean, checking all registered
* {@link SmartInstantiationAwareBeanPostProcessor SmartInstantiationAwareBeanPostProcessors}.
* @param beanClass the raw class of the bean
* @param beanName the name of the bean
* @return the candidate constructors, or {@code null} if none specified
* @throws org.springframework.beans.BeansException in case of errors
* @see org.springframework.beans.factory.config.SmartInstantiationAwareBeanPostProcessor#determineCandidateConstructors
*/
protected Constructor<?>[] determineConstructorsFromBeanPostProcessors(Class<?> beanClass, String beanName)
throws BeansException {
if (beanClass != null && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
Constructor<?>[] ctors = ibp.determineCandidateConstructors(beanClass, beanName);
if (ctors != null) {
return ctors;
}
}
}
}
return null;
}
/**
* Build an internal BeanFactory for resolving target beans.
* @param containingFactory the containing BeanFactory that originally defines the beans
* @return an independent internal BeanFactory to hold copies of some target beans
*/
protected DefaultListableBeanFactory buildInternalBeanFactory(ConfigurableBeanFactory containingFactory) {
// Set parent so that references (up container hierarchies) are correctly resolved.
DefaultListableBeanFactory internalBeanFactory = new DefaultListableBeanFactory(containingFactory);
// Required so that all BeanPostProcessors, Scopes, etc become available.
internalBeanFactory.copyConfigurationFrom(containingFactory);
// Filter out BeanPostProcessors that are part of the AOP infrastructure,
// since those are only meant to apply to beans defined in the original factory.
for (Iterator<BeanPostProcessor> it = internalBeanFactory.getBeanPostProcessors().iterator(); it.hasNext();) {
if (it.next() instanceof AopInfrastructureBean) {
it.remove();
}
}
return internalBeanFactory;
}
@Bean
BeanPostProcessor localClientRegionBeanPostProcessor(Environment environment) {
return new BeanPostProcessor() {
@Nullable @Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if (isClientRegion(bean)) {
configureAsLocalClientRegion(environment, bean);
}
return bean;
}
};
}
@Bean
BeanPostProcessor locatorFactoryBeanPostProcessor() {
return new BeanPostProcessor() {
@Nullable @Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if (bean instanceof LocatorFactoryBean) {
return new TestLocatorFactoryBean((LocatorFactoryBean) bean);
}
return bean;
}
};
}
/**
* Apply MergedBeanDefinitionPostProcessors to the specified bean definition,
* invoking their {@code postProcessMergedBeanDefinition} methods.
* @param mbd the merged bean definition for the bean
* @param beanType the actual type of the managed bean instance
* @param beanName the name of the bean
* @throws BeansException if any post-processing failed
* @see MergedBeanDefinitionPostProcessor#postProcessMergedBeanDefinition
*/
protected void applyMergedBeanDefinitionPostProcessors(RootBeanDefinition mbd, Class<?> beanType, String beanName)
throws BeansException {
try {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof MergedBeanDefinitionPostProcessor) {
MergedBeanDefinitionPostProcessor bdp = (MergedBeanDefinitionPostProcessor) bp;
bdp.postProcessMergedBeanDefinition(mbd, beanType, beanName);
}
}
}
catch (Exception ex) {
throw new BeanCreationException(mbd.getResourceDescription(), beanName,
"Post-processing failed of bean type [" + beanType + "] failed", ex);
}
}
/**
* 初始化前执行
*
* @param bean 实例
* @param beanName 名字
* @return
* @throws BeansException 异常
*/
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
if (this.yuRPCServer != null && bean != null && bean.getClass().isAnnotationPresent(YuRPCService.class)) {
this.yuRPCServer.register(bean);
LOGGER.info("register yurpc service = {}", beanName);
}
if (this.yuRPCClient != null && bean != null) {
// Class clazz = AopUtils.getTargetClass(bean); // AOP代理的目标类 https://github.com/spring-projects/spring-framework/issues/20132
Class clazz = ClassUtils.getUserClass(bean); // the original class for CGLIB-generated classes, consider ClassUtils.getUserClass
Field[] fields = clazz.getDeclaredFields();
if (fields != null && fields.length > 0) {
for (Field field : fields) {
if (field.isAnnotationPresent(YuRPCAutowired.class)) {
Object obj = this.yuRPCClient.proxy(field.getType());
try {
field.setAccessible(true);
field.set(bean, obj);
} catch (IllegalArgumentException | IllegalAccessException ex) {
LOGGER.error(ex.getMessage());
throw new BeansException(ex.getMessage()) {
};
}
LOGGER.info("service reference beanName = {}, field = {}", beanName, field.getName());
}
}
}
}
return BeanPostProcessor.super.postProcessBeforeInitialization(bean, beanName);
}
/**
* Register the given BeanPostProcessor beans.
*/
private static void registerBeanPostProcessors(
ConfigurableListableBeanFactory beanFactory, List<BeanPostProcessor> postProcessors) {
for (BeanPostProcessor postProcessor : postProcessors) {
beanFactory.addBeanPostProcessor(postProcessor);
}
}
@Override
public Object postProcessAfterInitialization(Object bean, String beanName) {
if (!(bean instanceof BeanPostProcessor) && !isInfrastructureBean(beanName) &&
this.beanFactory.getBeanPostProcessorCount() < this.beanPostProcessorTargetCount) {
if (logger.isInfoEnabled()) {
logger.info("Bean '" + beanName + "' of type [" + bean.getClass().getName() +
"] is not eligible for getting processed by all BeanPostProcessors " +
"(for example: not eligible for auto-proxying)");
}
}
return bean;
}
/**
* Create a new DisposableBeanAdapter for the given bean.
* @param bean the bean instance (never {@code null})
* @param beanName the name of the bean
* @param beanDefinition the merged bean definition
* @param postProcessors the List of BeanPostProcessors
* (potentially DestructionAwareBeanPostProcessor), if any
*/
public DisposableBeanAdapter(Object bean, String beanName, RootBeanDefinition beanDefinition,
List<BeanPostProcessor> postProcessors, @Nullable AccessControlContext acc) {
Assert.notNull(bean, "Disposable bean must not be null");
this.bean = bean;
this.beanName = beanName;
this.invokeDisposableBean =
(this.bean instanceof DisposableBean && !beanDefinition.isExternallyManagedDestroyMethod("destroy"));
this.nonPublicAccessAllowed = beanDefinition.isNonPublicAccessAllowed();
this.acc = acc;
String destroyMethodName = inferDestroyMethodIfNecessary(bean, beanDefinition);
if (destroyMethodName != null && !(this.invokeDisposableBean && "destroy".equals(destroyMethodName)) &&
!beanDefinition.isExternallyManagedDestroyMethod(destroyMethodName)) {
this.destroyMethodName = destroyMethodName;
this.destroyMethod = determineDestroyMethod(destroyMethodName);
if (this.destroyMethod == null) {
if (beanDefinition.isEnforceDestroyMethod()) {
throw new BeanDefinitionValidationException("Could not find a destroy method named '" +
destroyMethodName + "' on bean with name '" + beanName + "'");
}
}
else {
Class<?>[] paramTypes = this.destroyMethod.getParameterTypes();
if (paramTypes.length > 1) {
throw new BeanDefinitionValidationException("Method '" + destroyMethodName + "' of bean '" +
beanName + "' has more than one parameter - not supported as destroy method");
}
else if (paramTypes.length == 1 && boolean.class != paramTypes[0]) {
throw new BeanDefinitionValidationException("Method '" + destroyMethodName + "' of bean '" +
beanName + "' has a non-boolean parameter - not supported as destroy method");
}
}
}
this.beanPostProcessors = filterPostProcessors(postProcessors, bean);
}
/**
* Search for all DestructionAwareBeanPostProcessors in the List.
* @param postProcessors the List to search
* @return the filtered List of DestructionAwareBeanPostProcessors
*/
private List<DestructionAwareBeanPostProcessor> filterPostProcessors(List<BeanPostProcessor> postProcessors) {
List<DestructionAwareBeanPostProcessor> filteredPostProcessors = null;
if (!CollectionUtils.isEmpty(postProcessors)) {
filteredPostProcessors = new ArrayList<DestructionAwareBeanPostProcessor>(postProcessors.size());
for (BeanPostProcessor postProcessor : postProcessors) {
if (postProcessor instanceof DestructionAwareBeanPostProcessor) {
filteredPostProcessors.add((DestructionAwareBeanPostProcessor) postProcessor);
}
}
}
return filteredPostProcessors;
}
/**
* Check whether the given bean has destruction-aware post-processors applying to it.
* @param bean the bean instance
* @param postProcessors the post-processor candidates
*/
public static boolean hasApplicableProcessors(Object bean, List<BeanPostProcessor> postProcessors) {
if (!CollectionUtils.isEmpty(postProcessors)) {
for (BeanPostProcessor processor : postProcessors) {
if (processor instanceof DestructionAwareBeanPostProcessor) {
DestructionAwareBeanPostProcessor dabpp = (DestructionAwareBeanPostProcessor) processor;
if (dabpp.requiresDestruction(bean)) {
return true;
}
}
}
}
return false;
}
@Override
public void addBeanPostProcessor(BeanPostProcessor beanPostProcessor) {
Assert.notNull(beanPostProcessor, "BeanPostProcessor must not be null");
// Remove from old position, if any
this.beanPostProcessors.remove(beanPostProcessor);
// Track whether it is instantiation/destruction aware
if (beanPostProcessor instanceof InstantiationAwareBeanPostProcessor) {
this.hasInstantiationAwareBeanPostProcessors = true;
}
if (beanPostProcessor instanceof DestructionAwareBeanPostProcessor) {
this.hasDestructionAwareBeanPostProcessors = true;
}
// Add to end of list
this.beanPostProcessors.add(beanPostProcessor);
}
@Override
public Object applyBeanPostProcessorsBeforeInitialization(Object existingBean, String beanName)
throws BeansException {
Object result = existingBean;
for (BeanPostProcessor processor : getBeanPostProcessors()) {
Object current = processor.postProcessBeforeInitialization(result, beanName);
if (current == null) {
return result;
}
result = current;
}
return result;
}
@Override
public Object applyBeanPostProcessorsAfterInitialization(Object existingBean, String beanName)
throws BeansException {
Object result = existingBean;
for (BeanPostProcessor processor : getBeanPostProcessors()) {
Object current = processor.postProcessAfterInitialization(result, beanName);
if (current == null) {
return result;
}
result = current;
}
return result;
}
/**
* Obtain a reference for early access to the specified bean,
* typically for the purpose of resolving a circular reference.
*
* 获取用于早期访问指定 bean 的引用，通常用于解析循环引用
*
* @param beanName the name of the bean (for error handling purposes)
* @param mbd the merged bean definition for the bean
* @param bean the raw bean instance
* @return the object to expose as bean reference
*/
protected Object getEarlyBeanReference(String beanName, RootBeanDefinition mbd, Object bean) {
Object exposedObject = bean;
if (!mbd.isSynthetic() && hasInstantiationAwareBeanPostProcessors()) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof SmartInstantiationAwareBeanPostProcessor) {
SmartInstantiationAwareBeanPostProcessor ibp = (SmartInstantiationAwareBeanPostProcessor) bp;
exposedObject = ibp.getEarlyBeanReference(exposedObject, beanName);
}
}
}
return exposedObject;
}
/**
* Apply MergedBeanDefinitionPostProcessors to the specified bean definition,
* invoking their {@code postProcessMergedBeanDefinition} methods.
* @param mbd the merged bean definition for the bean
* @param beanType the actual type of the managed bean instance
* @param beanName the name of the bean
* @see MergedBeanDefinitionPostProcessor#postProcessMergedBeanDefinition
*/
protected void applyMergedBeanDefinitionPostProcessors(RootBeanDefinition mbd, Class<?> beanType, String beanName) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof MergedBeanDefinitionPostProcessor) {
MergedBeanDefinitionPostProcessor bdp = (MergedBeanDefinitionPostProcessor) bp;
bdp.postProcessMergedBeanDefinition(mbd, beanType, beanName);
}
}
}
/**
* Apply InstantiationAwareBeanPostProcessors to the specified bean definition
* (by class and name), invoking their {@code postProcessBeforeInstantiation} methods.
* <p>Any returned object will be used as the bean instead of actually instantiating
* the target bean. A {@code null} return value from the post-processor will
* result in the target bean being instantiated.
* @param beanClass the class of the bean to be instantiated
* @param beanName the name of the bean
* @return the bean object to use instead of a default instance of the target bean, or {@code null}
* @see InstantiationAwareBeanPostProcessor#postProcessBeforeInstantiation
*/
@Nullable
protected Object applyBeanPostProcessorsBeforeInstantiation(Class<?> beanClass, String beanName) {
for (BeanPostProcessor bp : getBeanPostProcessors()) {
if (bp instanceof InstantiationAwareBeanPostProcessor) {
InstantiationAwareBeanPostProcessor ibp = (InstantiationAwareBeanPostProcessor) bp;
Object result = ibp.postProcessBeforeInstantiation(beanClass, beanName);
if (result != null) {
return result;
}
}
}
return null;
}