自定义BeanFactoryPostProcessor以及AbstractApplicationContext的refresh

import org.springframework.beans.BeansException;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.stereotype.Component;

/**
 * org.springframework.context.support.AbstractApplicationContext#invokeBeanFactoryPostProcessors
 * 调用 BeanDefinitionRegistryPostProcessor 实现向容器内添加bean的定义
 * 调用 BeanFactoryPostProcessor 实现向容器内bean的定义的添加属性
 */
@Component
public class MyBeanFactoryPostProcessor implements BeanFactoryPostProcessor {
    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        BeanDefinition teacher = beanFactory.getBeanDefinition("teacher");
        MutablePropertyValues propertyValues = teacher.getPropertyValues();
        propertyValues.add("name","wangwu");
    }
}

@Component
public class Teacher {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Teacher{" +
                "name='" + name + '\'' +
                '}';
    }
}

org.springframework.context.support.AbstractApplicationContext#refresh

	@Override
	public void refresh() throws BeansException, IllegalStateException {
		synchronized (this.startupShutdownMonitor) {
			// Prepare this context for refreshing.
			prepareRefresh();//调用容器准备刷新的方法，获取容器的当前时间，同时给容器设置同步标识 //容器状态设置，初始化属性设置，检查必备属性是否存在

			// Tell the subclass to refresh the internal bean factory.//启动载入 //设置beanFactory序列化id， 获取beanFactory
			ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();//告诉子类启动refreshBeanFactory()方法， Bean定义资源文件的载入从子类的refreshBeanFactory() 方法启动

			// Prepare the bean factory for use in this context.//设置beanFactory一些属性,添加后置处理器，设置忽略的自动装配接口，注册一些组件
			prepareBeanFactory(beanFactory);//为 BeanFactory 配置容器特性，例如类加载器、事件处理器等

			try {
				// Allows post-processing of the bean factory in context subclasses.
				postProcessBeanFactory(beanFactory);//为容器的某些子类指定特殊的 Post 事件处理器

				// Invoke factory processors registered as beans in the context. //调用 BeanDefinitionRegistryPostProcessor 实现向容器内添加bean的定义，调用 BeanFactoryPostProcessor 实现向容器内bean的定义的添加属性
				invokeBeanFactoryPostProcessors(beanFactory);//调用所有注册的 BeanFactoryPostProcessor 的 Bean,调用Bean Factory后处理器//springboot的处理就是在此扩展的

				// Register bean processors that intercept bean creation.//找到 BeanPostProcessor 的实现，排序后注册进容器内
				registerBeanPostProcessors(beanFactory);//为 BeanFactory 注册 Post 事件处理器//BeanPostProcessor是 Bean后置处理器， 用于监听容器触发的事件

				// Initialize message source for this context.
				initMessageSource();//初始化信息源，和国际化相关

				// Initialize event multicaster for this context.
				initApplicationEventMulticaster();//初始化容器事件传播器

				// Initialize other special beans in specific context subclasses.
				onRefresh();//调用子类的某些特殊 Bean 的初始化方法

				// Check for listener beans and register them.
				registerListeners();//为事件传播器注册事件监听器，派发早期事件

				// Instantiate all remaining (non-lazy-init) singletons.
				finishBeanFactoryInitialization(beanFactory);//初始化所有剩余的单例 Bean

				// Last step: publish corresponding event.//调用生命周期处理器onRefresh方法，发布ContextRefreshedEvent事件，JMX相关处理
				finishRefresh();//初始化容器的生命周期事件处理器，并发布容器的生命周期事件
			}

			catch (BeansException ex) {
				if (logger.isWarnEnabled()) {
					logger.warn("Exception encountered during context initialization - " +
							"cancelling refresh attempt: " + ex);
				}

				// Destroy already created singletons to avoid dangling resources.
				destroyBeans();//销毁己创建的 Bean

				// Reset 'active' flag.
				cancelRefresh(ex);//取消刷新操作 ，重置容器的同步标识

				// Propagate exception to caller.
				throw ex;
			}

			finally {
				// Reset common introspection caches in Spring's core, since we
				// might not ever need metadata for singleton beans anymore...
				resetCommonCaches();//重设公共缓存
			}
		}
	}