Spring類加載初始化Bean鏈路

1.spring類加載

AbstractApplicationContext.finishBeanFactoryInitialization(...);
    beanFactory.preInstantiateSingletons();
       DefaultListableBeanFactory.getBean(beanName);
          AbstractBeanFactory.doGetBean();
            AbstractAutowireCapableBeanFactory.createBean(....)
                populateBean(beanName, mbd, instanceWrapper);
                initializeBean(...)
                 //調用BeanPostProcessor.postProcessBeforeInitialization()方法
                  applyBeanPostProcessorsBeforeInitialization(wrappedBean, beanName);
                 //調用BeanPostProcessor.postProcessBeforeInitialization()方法
                  applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName);

2.BeanPostProcessor有個實現類CommonAnnotationBeanPostProcessor，專門處理@PostConstruct @PreDestroy註解。

CommonAnnotationBeanPostProcessor的父類InitDestroyAnnotationBeanPostProcessor()
 InitDestroyAnnotationBeanPostProcessor.postProcessBeforeInitialization()
    InitDestroyAnnotationBeanPostProcessor.findLifecycleMetadata()
        // 組裝生命週期元數據
        InitDestroyAnnotationBeanPostProcessor.buildLifecycleMetadata()
            // 查找@PostConstruct註釋的方法
            InitDestroyAnnotationBeanPostProcessor.initAnnotationType
            // 查找@PreDestroy註釋方法
            InitDestroyAnnotationBeanPostProcessor.destroyAnnotationType
 // 反射調用          
 metadata.invokeInitMethods(bean, beanName);