获取父bean工厂中的bean后处理器以处理子工厂中的bean

Question

我有一个父bean工厂，我想在其中的BeanPostProcessor中发布子工厂中的进程bean。 AFAIK，这在Spring中不受支持。我有什么选择？ （当然除了在每个子工厂的XML中声明后处理器）

Answer 1

一个“解决方案”是将bean后置处理器添加到执行父处理器的子上下文。这是我们最终使用的技术。这是潜在的危险，而不是最好的春季国际海事组织。

/** 
* A {@linkplain BeanPostProcessor} that references the BeanPostProcessors in the parent context and applies them 
* to context this post processor is a part of. Any BeanPostProcessors from the parent that are {@link BeanFactoryAware} will 
* have the {@linkplain BeanFactory} from the child context set on them during the post processing. This is necessary to let such post processors 
* have access to the entire context. 
*/ 
public class ParentContextBeanPostProcessor implements BeanPostProcessor { 

    private final Collection<BeanPostProcessor> parentProcessors; 
    private final BeanFactory beanFactory; 
    private final BeanFactory parentBeanFactory; 

    /** 
    * @param parent the parent context 
    * @param beanFactory the beanFactory associated with this post processor's context 
    */ 
    public ParentContextBeanPostProcessor(ConfigurableApplicationContext parent, BeanFactory beanFactory) { 
    this.parentProcessors = parent.getBeansOfType(BeanPostProcessor.class).values(); 
    this.beanFactory = beanFactory; 
    this.parentBeanFactory = parent.getBeanFactory(); 
    } 

    /** {@inheritDoc} */ 
    @Override 
    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException { 
    for (BeanPostProcessor processor : parentProcessors) { 
     if (processor instanceof BeanFactoryAware) { 
     ((BeanFactoryAware) processor).setBeanFactory(beanFactory); 
     } 
     try { 
     bean = processor.postProcessBeforeInitialization(bean, beanName); 
     } finally { 
     if (processor instanceof BeanFactoryAware) { 
      ((BeanFactoryAware) processor).setBeanFactory(parentBeanFactory); 
     } 
     } 
    } 
    return bean; 
    } 

    /** {@inheritDoc} */ 
    @Override 
    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { 
    for (BeanPostProcessor processor : parentProcessors) { 
     if (processor instanceof BeanFactoryAware) { 
     ((BeanFactoryAware) processor).setBeanFactory(beanFactory); 
     } 
     try { 
     bean = processor.postProcessAfterInitialization(bean, beanName); 
     } finally { 
     if (processor instanceof BeanFactoryAware) { 
      ((BeanFactoryAware) processor).setBeanFactory(parentBeanFactory); 
     } 
     } 
    } 
    return bean; 
    } 
}