spring啟動核心源碼

@Override
public void refresh() throws BeansException, IllegalStateException {
    synchronized (this.startupShutdownMonitor) {
        // Prepare this context for refreshing.
        prepareRefresh();

        // 這裡是在子類中啟動refreshBeanFactory()的地方
        ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();

        // Prepare the bean factory for use in this context.
        prepareBeanFactory(beanFactory);

        try {
            //設定BeanFactory的後置處理
            postProcessBeanFactory(beanFactory);

            //調用BeanFactory的後處理器，這些後處理器是在Bean定義中向容器注冊的
            invokeBeanFactoryPostProcessors(beanFactory);

            // Register bean processors that intercept bean creation.
            registerBeanPostProcessors(beanFactory);

            //對上下文中的消息源進行初始化
            initMessageSource();

            //初始化上下文中的事件機制
            initApplicationEventMulticaster();

            //初始化其他的特殊Bean
            onRefresh();

            //檢查監聽Bean并且将這些Bean向容器注冊
            registerListeners();

            //執行個體化所有的(non-lazy-init)單件
            finishBeanFactoryInitialization(beanFactory);

            //釋出容器事件，結束Refresh過程
            finishRefresh();
        }

        catch (BeansException ex) {
            logger.warn("Exception encountered during context initialization - cancelling refresh attempt", ex);

            //為防止Bean資源占用，在異常進行中，銷毀已經在前面過程中生成的單件Bean
            destroyBeans();

            //重置active
            cancelRefresh(ex);

            // Propagate exception to caller.
            throw ex;
        }
    }
}