java Spring:在BeanFactory后处理器中设置BeanFactory

Question

我有问候豆：

@Component
public class Greeting implements IGreeting {
    private String greeting;
    // setter and getter
}

我有BeanFactoryPostProcessor：

@Component
public class GreetingBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory configurableListableBeanFactory) throws BeansException {
        BeanDefinition beanDefinition = configurableListableBeanFactory.getBeanDefinition("greeting");
        beanDefinition.setFactoryBeanName("greetingBeanFactory");
    }
}

我有BeanFactory：

@Component
public class GreetingBeanFactory extends AbstractFactoryBean<Object> {
    @Override
    public Class<Greeting> getObjectType() {
        return Greeting.class;
    }

    @Override
    protected Object createInstance() throws Exception {
        LocalDateTime currentTime = LocalDateTime.now();
        int hour = currentTime.getHour();
        IGreeting greeting = new Greeting();
        if ((hour >= 7) && (12 > hour)) {
            greeting.setGreeting("morning");
        }else if((hour >= 12) && (18 > hour)) {
            greeting.setGreeting("day");
        }else if((hour >= 18) && (24 > hour)){
            greeting.setGreeting("evening");
        }else if((hour >= 0) && (7 > hour)){
            greeting.setGreeting("night");
        }
        System.out.println("Tuned 'Greeting' by Factory Bean: " + greeting);
        return greeting;
    }
}

和控制器：

@RestController
public class HelloController {

    @Autowired
    IGreeting greeting;

    @RequestMapping("/hello_world")
    public String index() {
        System.out.println("Actual `Greeting` used in application: " + greeting);
        return String.format("Good %s!", greeting.getGreeting());
    }

}

我正在记录实例，请参见以下内容：

Tuned 'Greeting' by Factory Bean: com.epam.springboot.model.Greeting@514eedd8
Actual `Greeting` used in application: com.epam.springboot.model.Greeting@39c4a65a

为什么我的调优的FactoryBean实例丢失了，为什么我得到了一个新实例 在控制器中？它是一个好的架构吗？它是FactoryBean和FactoryBeanPostProcessor使用的好例子吗