与 CDI 的 InjectionPoint 等效的 Spring DI 是什么? [英] What is the Spring DI equivalent of CDI's InjectionPoint?

问题描述

我想创建一个 Spring 的 bean 生产者方法，它知道是谁调用了它，所以我从以下代码开始:

I would like to create a Spring's bean producer method which is aware who invoked it, so I've started with the following code:

@Configuration
public class LoggerProvider {

    @Bean
    @Scope("prototype")
    public Logger produceLogger() {
        // get known WHAT bean/component invoked this producer 
        Class<?> clazz = ...

        return LoggerFactory.getLogger(clazz);
    }
}

我如何获得谁想要注入 bean 的信息?

How can I get the information who wants to get the bean injected?

我正在寻找一些相当于 CDI 在 Spring 世界中的 InjectionPoint.

I'm looking for some equivalent of CDI's InjectionPoint in Spring world.

推荐答案

据我所知，Spring没有这样的概念.

As far as I know, Spring does not have such a concept.

然后唯一知道处理的点是 BeanPostProcessor.

Then only thing that is aware of the point that is processed is a BeanPostProcessor.

示例:

@Target(PARAMETER)
@Retention(RUNTIME)
@Documented
public @interface Logger {}

public class LoggerInjectBeanPostProcessor implements BeanPostProcessor {   
    public Logger produceLogger() {
        // get known WHAT bean/component invoked this producer
        Class<?> clazz = ...    
        return LoggerFactory.getLogger(clazz);
    }


    @Override
    public Object postProcessBeforeInitialization(final Object bean,
            final String beanName) throws BeansException {
        return bean;
    }

    @Override
    public Object postProcessAfterInitialization(final Object bean,
            final String beanName) throws BeansException {

        ReflectionUtils.doWithFields(bean.getClass(),
                new FieldCallback() {
                     @Override
                     public void doWith(final Field field) throws IllegalArgumentException, IllegalAccessException {
                         field.set(bean, produceLogger());
                     }
                },
                new ReflectionUtils.FieldFilter() {
                     @Override
                     public boolean matches(final Field field) {
                          return field.getAnnotation(Logger.class) != null;
                     }
                });

        return bean;
    }
}

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