承接前文Spring源码情操陶冶-AbstractApplicationContext#invokeBeanFactoryPostProcessors

瞧瞧官方注释

    /*** Instantiate and invoke all registered BeanPostProcessor beans,* respecting explicit order if given.* <p>Must be called before any instantiation of application beans.*/

实例化并且调用所有的已注册的BeanPostProcessor beans，其实也就是简单的把DefaultListableFactory中的所有为BeanPostProcessor的实现bean类放置于其内部属性beanPostProcessors List集合中。

直接源码

protected void registerBeanPostProcessors(ConfigurableListableBeanFactory beanFactory) {//调用的是委托类的registerBeanPostProcessors方法      PostProcessorRegistrationDelegate.registerBeanPostProcessors(beanFactory, this);}

间接源码-PostProcessorRegistrationDelegate.registerBeanPostProcessors

public static void registerBeanPostProcessors(ConfigurableListableBeanFactory beanFactory, AbstractApplicationContext applicationContext) {
//获取beanFactory中的所有实现BeanPostProcessor接口的beanString[] 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;//BeanPostProcessorChecker检查类beanFactory.addBeanPostProcessor(new BeanPostProcessorChecker(beanFactory, beanProcessorTargetCount));//此处的实现与上节的invokeBeanFactoryPostProcessors方法一致，这里就省略不赘述了List<BeanPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanPostProcessor>();List<BeanPostProcessor> internalPostProcessors = new ArrayList<BeanPostProcessor>();List<String> orderedPostProcessorNames = new ArrayList<String>();List<String> nonOrderedPostProcessorNames = new ArrayList<String>();/**省略*/// Finally, re-register all internal BeanPostProcessors.OrderComparator.sort(internalPostProcessors);//主要是调用此方法将所有的postProcessors按照优先级有序的放置在beanFactory的内部属性beanPostProcessors集合中registerBeanPostProcessors(beanFactory, internalPostProcessors);//增加ApplicationListenerDetector类beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(applicationContext));}

小结

1. 获取beanFactory中的所有实现postProcessor接口的bean对象按照优先级有序的放置在beanFactory的内部属性beanPostProcessors集合中，但是并没有执行其中的相应公共方法
2. 新增两个BeanPostProcessor实现类：BeanPostProcessorChecker为首，ApplicationListenerDetector为尾

下节预告

Spring源码情操陶冶-AbstractApplicationContext#initMessageSource