spring源码分析——BeanPostProcessor接口
BeanPostProcessor是处理bean的后置接口，beanDefinitionMaps中的BeanDefinition实例化完成后，完成populateBean，属性设置，完成
初始化后，这个接口支持对bean做自定义的操作。
一：BeanPostProcessor的使用
定义一个测试用的model对象，name属性默认为hello
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public class BeanDemo {
private String name = "hello";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
final StringBuffer sb = new StringBuffer("BeanDemo{");
sb.append("name='").append(name).append('\'');
sb.append('}');
return sb.toString();
}
}
自定义一个MyBeanPostProcessor类，实现BeanPostProcessor接口
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@Service
public class MyBeanPostProcessor implements BeanPostProcessor {
public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
return null;
}
public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
if(beanName.equals("beanDemo")){
BeanDemo beanDemo = (BeanDemo)bean;
beanDemo.setName("kitty");
return beanDemo;
}
return bean;
}
}
从运行结果看，spring中维护的beanName为beanDemo的对象，name属性为ketty
二：看看源码怎么实现的
1：实例化并且注册到beanPostProcessors集合中
主要的实例化逻辑在这个接口，这个接口的作用就是把所有实现BeanPostProcessor接口的类实例化，然后注册到 beanPostProcessors这个缓存中
一：BeanDefinitionRegistryPostProcessor 与BeanFactoryPostProcessor接口
这个接口支持自定义beanDefinition的注册，在标准的注册完成后（解析xml或者注解），在与实例化对象之前，实现这个接口
可以向beanDefinitionMap中注册自定义的beanDefinition，这个接口从定义上看更多的是关注注册。
1：实现beanDefinitionRegistryPostProcessor接口，重写postProcessBeanDefinitionRegistry方法，在方法内创建beanDefinition对象，然后注册到beanDefinitionRegistry中
创建一个pojo对象BeanDemo，用于测试在接口中注册自定义beanDefinition
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public class BeanDemo {
private String name = "hello";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
final StringBuffer sb = new StringBuffer("BeanDemo{");
sb.append("name='").append(name).append('\'');
sb.append('}');
return sb.toString();
}
}
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@Component
public class MyBeanDefinitionRegistryPostProcessor implements BeanDefinitionRegistryPostProcessor {
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
System.out.println("MyBeanDefinitionRegistryPostProcessor: "+registry);
// 向beanDefinitionMap中注册自定义的beanDefinition对象
GenericBeanDefinition beanDefinition = new GenericBeanDefinition();
beanDefinition.setBeanClass(BeanDemo.class);
registry.registerBeanDefinition("beanDemo",beanDefinition);
}
public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
System.out.println("MyBeanDefinitionRegistryPostProcessor: "+beanFactory);
}
}
成功的从spring容器中拿到了对象：
2：BeanFactoryPostProcessor接口
这个接口支持修改容器内的beanDefinition对象，也可以直接注册bean对象，在标准的beanDefinition注册之后以及预实例化bean对象之前
通过运行结果可以看出beanDefinition在postProcessBeanFactory方法中被修改：
在beanFactoryPostProcessor接口中注册对象后，可以在spring中获取到。
二：从源码层面分析接口调用
refresh方法中invokeBeanFactoryPostProcessors：
主要的核心逻辑都在这个方法内：
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public static void invokeBeanFactoryPostProcessors(
ConfigurableListableBeanFactory beanFactory, List beanFactoryPostProcessors) {
// Invoke BeanDefinitionRegistryPostProcessors first, if any.
// 如果存在BeanDefinitionRegistryPostProcessor类型对象，要先调用
Set processedBeans = new HashSet<>();
if (beanFactory instanceof BeanDefinitionRegistry) {
BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
List regularPostProcessors = new ArrayList<>();
List registryProcessors = new ArrayList<>();
// 第一次进来beanFactoryPostProcessors集合为空，不会走进来
for (BeanFactoryPostProcessor postProcessor : beanFactoryPostProcessors) {
if (postProcessor instanceof BeanDefinitionRegistryPostProcessor) {
BeanDefinitionRegistryPostProcessor registryProcessor =
(BeanDefinitionRegistryPostProcessor) postProcessor;
registryProcessor.postProcessBeanDefinitionRegistry(registry);
registryProcessors.add(registryProcessor);
}
else {
regularPostProcessors.add(postProcessor);
}
}
// Do not initialize FactoryBeans here: We need to leave all regular beans
// uninitialized to let the bean factory post-processors apply to them!
// Separate between BeanDefinitionRegistryPostProcessors that implement
// PriorityOrdered, Ordered, and the rest.
/**
* 不要在这里初始化FactoryBean类型的对象，不要初始化post-Processor对象，要把
* PriorityOrdered类型和Ordered类型以及剩下的分开
*/
List currentRegistryProcessors = new ArrayList<>();
// First, invoke the BeanDefinitionRegistryPostProcessors that implement PriorityOrdered.
/**
* 1: 根据类型找到所有实现BeanDefinitionRegistryPostProcessor接口的beanName
* 2: 遍历所有beanName，判断是否是PriorityOrdered接口的实例
* 3: 如果是则 getBean实例化这个对象，然后放入processedBean集合中
*
* 在这里getBeanNamesForType 会把字父类的beanDefinition合并Merge，得到RootBeanDefinition
*/
String[] postProcessorNames =
beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
for (String ppName : postProcessorNames) {
if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
processedBeans.add(ppName);
}
}
/**
* 1：对currentRegistryProcessors集合内实例对象排序
* 2: 将排序过的集合添加到注册集合registryProcessors中
* 3：调用currentRegistryProcessors集合中对象方法
* 4：清空当前注册对象集合currentRegistryProcessors
*/
sortPostProcessors(currentRegistryProcessors, beanFactory);
registryProcessors.addAll(currentRegistryProcessors);
// 调用注册对象方法
invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
currentRegistryProcessors.clear();
// Next, invoke the BeanDefinitionRegistryPostProcessors that implement Ordered.
/**
* 在这里步骤和上一步类似，只不过这里操作的是实现Ordered接口的类
*/
postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
for (String ppName : postProcessorNames) {
if (!processedBeans.contains(ppName) && beanFactory.isTypeMatch(ppName, Ordered.class)) {
currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
processedBeans.add(ppName);
}
}
sortPostProcessors(currentRegistryProcessors, beanFactory);
registryProcessors.addAll(currentRegistryProcessors);
invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
currentRegistryProcessors.clear();
// Finally, invoke all other BeanDefinitionRegistryPostProcessors until no further ones appear.
/**
* 还是重复上面的动作，不过这次是排除掉上面已经调用过的实例（实现PriorityOrdered和Ordered接口）
*/
boolean reiterate = true;
while (reiterate) {
reiterate = false;
postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
for (String ppName : postProcessorNames) {
if (!processedBeans.contains(ppName)) {
currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
processedBeans.add(ppName);
reiterate = true;
}
}
sortPostProcessors(currentRegistryProcessors, beanFactory);
registryProcessors.addAll(currentRegistryProcessors);
invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
currentRegistryProcessors.clear();
}
// Now, invoke the postProcessBeanFactory callback of all processors handled so far.
/**
* 在这里，调用上面已经处理过的所有处理器的postProcessBeanFactory回调方法
*/
invokeBeanFactoryPostProcessors(registryProcessors, beanFactory);
invokeBeanFactoryPostProcessors(regularPostProcessors, beanFactory);
}
else {
// Invoke factory processors registered with the context instance.
invokeBeanFactoryPostProcessors(beanFactoryPostProcessors, beanFactory);
}
// Do not initialize FactoryBeans here: We need to leave all regular beans
// uninitialized to let the bean factory post-processors apply to them!
String[] postProcessorNames =
beanFactory.getBeanNamesForType(BeanFactoryPostProcessor.class, true, false);
// Separate between BeanFactoryPostProcessors that implement PriorityOrdered,
// Ordered, and the rest.
List priorityOrderedPostProcessors = new ArrayList<>();
List orderedPostProcessorNames = new ArrayList<>();
List nonOrderedPostProcessorNames = new ArrayList<>();
for (String ppName : postProcessorNames) {
if (processedBeans.contains(ppName)) {
// skip - already processed in first phase above
}
else if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
priorityOrderedPostProcessors.add(beanFactory.getBean(ppName, BeanFactoryPostProcessor.class));
}
else if (beanFactory.isTypeMatch(ppName, Ordered.class)) {
orderedPostProcessorNames.add(ppName);
}
else {
nonOrderedPostProcessorNames.add(ppName);
}
}
// First, invoke the BeanFactoryPostProcessors that implement PriorityOrdered.
sortPostProcessors(priorityOrderedPostProcessors, beanFactory);
invokeBeanFactoryPostProcessors(priorityOrderedPostProcessors, beanFactory);
// Next, invoke the BeanFactoryPostProcessors that implement Ordered.
List orderedPostProcessors = new ArrayList<>();
for (String postProcessorName : orderedPostProcessorNames) {
orderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
}
sortPostProcessors(orderedPostProcessors, beanFactory);
invokeBeanFactoryPostProcessors(orderedPostProcessors, beanFactory);
// Finally, invoke all other BeanFactoryPostProcessors.
List nonOrderedPostProcessors = new ArrayList<>();
for (String postProcessorName : nonOrderedPostProcessorNames) {
nonOrderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
}
invokeBeanFactoryPostProcessors(nonOrderedPostProcessors, beanFactory);
// Clear cached merged bean definitions since the post-processors might have
// modified the original metadata, e.g. replacing placeholders in values...
beanFactory.clearMetadataCache();
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public static void registerBeanPostProcessors(
ConfigurableListableBeanFactory beanFactory, AbstractApplicationContext applicationContext) {
// 获取所有实现接口BeanPostProcessor的beanName
String[] postProcessorNames = beanFactory.getBeanNamesForType(BeanPostProcessor.class, true, false);
// Register BeanPostProcessorChecker that logs an info message when
// a bean is created during BeanPostProcessor instantiation, i.e. when
// a bean is not eligible for getting processed by all BeanPostProcessors.
int beanProcessorTargetCount = beanFactory.getBeanPostProcessorCount() + 1 + postProcessorNames.length;
beanFactory.addBeanPostProcessor(new BeanPostProcessorChecker(beanFactory, beanProcessorTargetCount));
// Separate between BeanPostProcessors that implement PriorityOrdered,
// Ordered, and the rest.
/**
* 把实现PriorityOrdered 和 Ordered 和 其他的处理器分开
*/
List priorityOrderedPostProcessors = new ArrayList<>();
List internalPostProcessors = new ArrayList<>();
List orderedPostProcessorNames = new ArrayList<>();
List nonOrderedPostProcessorNames = new ArrayList<>();
/**
* 1：遍历集合postProcessorNames
* 2：判断类型，如果是PriorityOrdered，则实例化对象放入priorityOrderedPostProcessors集合，
* Ordered 则放入orderedPostProcessorNames集合，其他的放入nonOrderedPostProcessorNames集合
*/
for (String ppName : postProcessorNames) {
if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
priorityOrderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
internalPostProcessors.add(pp);
}
}
else if (beanFactory.isTypeMatch(ppName, Ordered.class)) {
orderedPostProcessorNames.add(ppName);
}
else {
nonOrderedPostProcessorNames.add(ppName);
}
}
// First, register the BeanPostProcessors that implement PriorityOrdered.
// 首先对priorityOrderedPostProcessors集合中实例对象排序，然后注册，放入beanFactory中缓存下来
sortPostProcessors(priorityOrderedPostProcessors, beanFactory);
registerBeanPostProcessors(beanFactory, priorityOrderedPostProcessors);
// Next, register the BeanPostProcessors that implement Ordered.
// 然后再实例化实现Ordered接口的对象，完成注册
List orderedPostProcessors = new ArrayList<>();
for (String ppName : orderedPostProcessorNames) {
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
orderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
internalPostProcessors.add(pp);
}
}
sortPostProcessors(orderedPostProcessors, beanFactory);
registerBeanPostProcessors(beanFactory, orderedPostProcessors);
// Now, register all regular BeanPostProcessors.
// 最后实例化什么都没有实现的，完成实例化并注册
List nonOrderedPostProcessors = new ArrayList<>();
for (String ppName : nonOrderedPostProcessorNames) {
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
nonOrderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
internalPostProcessors.add(pp);
}
}
registerBeanPostProcessors(beanFactory, nonOrderedPostProcessors);
// Finally, re-register all internal BeanPostProcessors.
// 最后再次注册内部postProcessor
sortPostProcessors(internalPostProcessors, beanFactory);
registerBeanPostProcessors(beanFactory, internalPostProcessors);
// Re-register post-processor for detecting inner beans as ApplicationListeners,
// moving it to the end of the processor chain (for picking up proxies etc).
beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(applicationContext));
}
定义四类容器，高优先级有序、有序、无序、内部
分类放入四种容器：
注册BeanPostProcessor，将实现BeanPostProcessor接口的对象放入beanPostProcessors缓存中
注册完PriorityOrdered的实现类后，再处理Ordered的实现类
注册什么都没有实现的BeanPostProcessor接口实现类，
最后注册内部的BeanPostProcessor对象
到这里BeanPostProcessor的实例化以及注册工作完成，在beanFactory的beanPostProcessors集合中已经缓存了所有的beanPostProcessor的对象
2：BeanPostProcessor的使用
因为这个接口是bean的后置接口，所以需要bean创建并初始化完成，才可以发挥作用,上一步的缓存只是埋好点，以备使用，因为bean的实例化流程我们
还没有分析，这里直接看一下怎么使用的
我们看一下init方法后的拦截，因为这个时候已经init完成，可以在后置接口中对bean做一下修改的操作
调用到我们自定义的MyBeanPostProcessor实现类：
把这个beanDemo对象属性修改一下，修改完，再返回，将这个对象缓存到spring的一级缓存中。
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总结：
BeanPostProcessor接口主要是对bean对象做一些自定义的操作，修改bean对象的信息，aop代理也是通过这种方式实现的，
在refresh的registryBeanPostProcessor方法中实例化BeanPostProcessor对象，并且注册到beanFactory容器的beanPostProcessors的缓存中，
然后在后续的操作中拦截使用。