BeanDefinitionRegistryPostProcessor - 如何将@Configuration类注册为BeanDefinition并获取其@Beans注册 [英] BeanDefinitionRegistryPostProcessor - How to register a @Configuration class as BeanDefinition and get its @Beans registered as well

问题描述

假设我有这个 @Configuration 类：

@Configuration
public class SomeConfig{

    @Bean
    public MyBean myBean(){
         return new MyBean();
    } 

    @Bean
    public Another anotherBean(){
         return new AnotherBean();
    }
}

我有一个实现 BeanDefinitionRegistryPostProcessor 添加某些 BeanDefinition 。在它上面我还想导入 SomeConfig ，以便将其bean添加到上下文中：

I have a class that implements BeanDefinitionRegistryPostProcessor to add certain BeanDefinitions. On it I also would like to import SomeConfig so that its beans are added to the context:

@Override
public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
    BeanDefinition someConfig= new RootBeanDefinition("x.y.z.SomeConfig");
    registry.registerBeanDefinition("someConfig", someConfig);
}

问题是 SomeConfig 的bean（ myBean ， anotherBean ）尚未添加到上下文中。但是有一个someConfig bean：

The problem is that SomeConfig's beans (myBean, anotherBean) haven't been added to the context. There is a someConfig bean though:

@Autowired
MyBean myBean   ---> FAILS

@Autowired
AnotherBean anotherBean   ---> FAILS

@Autowired
SomeConfig someConfig   ---> OK

推荐答案

之所以没有导入 @Bean s是我的后处理器之前执行了 ConfigurationClassPostProcessor 所以没有添加新的bean。为了解决这个问题，我实现了 PriorityOrdered ：

There reason why it didn't import the @Beans was that ConfigurationClassPostProcessor was executed before my postprocessor so the new beans weren't added. To solve it I implemented PriorityOrdered:

@Configuration
public class MyFactoryPostProcessor implements BeanDefinitionRegistryPostProcessor, PriorityOrdered{

    @Override
    public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
        BeanDefinition someConfig= new RootBeanDefinition("x.y.z.SomeConfig");
        registry.registerBeanDefinition("someConfig", enableOAuth2ClientBd);
    }

    @Override
    public int getOrder() {
        return Ordered.HIGHEST_PRECEDENCE;
    }
}

它还重要后处理器类是 @Configuration 并且直接在配置中导入，未在另一个 @Configuration 类定义为@Bean：

It's also important that the postprocessor class is @Configuration and is imported directly in the config, not defined in another @Configuration class with it defined as @Bean:

@Configuration
public class BeanDefinitionFactoryTestConfig {

    @Bean
    public MyFactoryPostProcessor cc(){
        return new MyFactoryPostProcessor ();
    }   
}

- >>这将无法进口豆子<< -

-->> THIS WILL FAIL TO IMPORT THE BEANS<<--

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