4. 执行剩余 BeanDefinitionRegistryPostProcessor

处理其他 BeanDefinitionRegistryPostProcessor

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();
}