boolean reiterate = true;
while (reiterate) {
    reiterate = false;
    //查出所有實現(xiàn)了BeanDefinitionRegistryPostProcessor接口的bean名稱
    postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
    for (String ppName : postProcessorNames) {
        //前面的邏輯中，已經(jīng)對實現(xiàn)了PriorityOrdered和Ordered的bean都處理過了，因此通過processedBeans過濾，processedBeans中沒有的才會在此處理
        if (!processedBeans.contains(ppName)) {
            //根據(jù)名稱和類型獲取bean
            BeanDefinitionRegistryPostProcessor pp = beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class);
            //把已經(jīng)調(diào)用過postProcessBeanDefinitionRegistry方法的bean全部放在registryPostProcessors中
            registryPostProcessors.add(pp);
            //把已經(jīng)調(diào)用過postProcessBeanDefinitionRegistry方法的bean的名稱全部放在processedBeans中
            processedBeans.add(ppName);
            //執(zhí)行此bean的postProcessBeanDefinitionRegistry方法
            pp.postProcessBeanDefinitionRegistry(registry);
            //改變退出while的條件
            reiterate = true;
        }
    }
}
/registryPostProcessors中保存了所有執(zhí)行過postProcessBeanDefinitionRegistry方法的bean，
//現(xiàn)在再來執(zhí)行這些bean的postProcessBeanFactory方法
invokeBeanFactoryPostProcessors(registryPostProcessors, beanFactory);
//regularPostProcessors中保存的是所有入?yún)⒅袔淼腂eanFactoryPostProcessor實現(xiàn)類，并且這里面已經(jīng)剔除了BeanDefinitionRegistryPostProcessor的實現(xiàn)類，現(xiàn)在要讓這些bean執(zhí)行postProcessBeanFactory方法

public class AnnotationScannerConfigurer implements BeanDefinitionRegistryPostProcessor {
	@Override
	public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry beanDefinitionRegistry) throws BeansException {
		// 創(chuàng)建一個bean的定義類的對象
		RootBeanDefinition rootBeanDefinition = new RootBeanDefinition(TestServiceImpl.class);
		// 將Bean 的定義注冊到Spring環(huán)境
		beanDefinitionRegistry.registerBeanDefinition("testService", rootBeanDefinition);
	}
	
	@Override
	public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
	  // bean的名字為key, bean的實例為value
		Map<String, Object> beanMap = configurableListableBeanFactory.getBeansWithAnnotation(AutoDiscoverClass.class);
		}

configurableListableBeanFactory.getBeansWithAnnotation(AutoDiscoverClass.class);