BeanPostProcessor生命周期（深入源码）

BeanPostProcessor：Bean的后置处理器，在bean初始化前后进行处理工作。源码内容如下，该类为借口，定义了两个方法。

/**
	 * Apply this BeanPostProcessor to the given new bean instance <i>before</i> any bean
	 * initialization callbacks (like InitializingBean's {@code afterPropertiesSet}
	 * or a custom init-method). The bean will already be populated with property values.
	 * The returned bean instance may be a wrapper around the original.
	 * @param bean the new bean instance
	 * @param beanName the name of the bean
	 * @return the bean instance to use, either the original or a wrapped one;
	 * if {@code null}, no subsequent BeanPostProcessors will be invoked
	 * @throws org.springframework.beans.BeansException in case of errors
	 * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet
	 */
	Object postProcess**Before**Initialization(Object bean, String beanName) throws BeansException;

	/**
	 * Apply this BeanPostProcessor to the given new bean instance <i>after</i> any bean
	 * initialization callbacks (like InitializingBean's {@code afterPropertiesSet}
	 * or a custom init-method). The bean will already be populated with property values.
	 * The returned bean instance may be a wrapper around the original.
	 * <p>In case of a FactoryBean, this callback will be invoked for both the FactoryBean
	 * instance and the objects created by the FactoryBean (as of Spring 2.0). The
	 * post-processor can decide whether to apply to either the FactoryBean or created
	 * objects or both through corresponding {@code bean instanceof FactoryBean} checks.
	 * <p>This callback will also be invoked after a short-circuiting triggered by a
	 * {@link InstantiationAwareBeanPostProcessor#postProcessBeforeInstantiation} method,
	 * in contrast to all other BeanPostProcessor callbacks.
	 * @param bean the new bean instance
	 * @param beanName the name of the bean
	 * @return the bean instance to use, either the original or a wrapped one;
	 * if {@code null}, no subsequent BeanPostProcessors will be invoked
	 * @throws org.springframework.beans.BeansException in case of errors
	 * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet
	 * @see org.springframework.beans.factory.FactoryBean
	 */
	Object postProcess**After**Initialization(Object bean, String beanName) throws BeansException;

由源码可知两种方法最大的不同是一个在bean初始化前（before）工作，一个在bean初始化后开始工作（after）。

上图为beanpostprocessor创建的方法调用栈

首先创建容器，并注册其配置类的信息，然后调用refresh()方法
refresh()方法介绍如图上面说（加载或刷新配置的持久表示，可能是XML文件、属性文件或关系数据库架构。由于这是一个启动方法，如果失败，它应该销毁已经创建的singletone，以避免悬空的资源。换句话说，在调用该方法之后，要么全部实例化，要么根本不实例化。）
调用里面的finishBeanFactoryInitialization()方法
这个方法的作用就是实例化所有非懒汉式单实例。
待续