org.springframework.web.context.support
Class XmlWebApplicationContext
java.lang.Object
org.springframework.core.io.DefaultResourceLoader
org.springframework.context.support.AbstractApplicationContext
org.springframework.context.support.AbstractRefreshableApplicationContext
org.springframework.context.support.AbstractRefreshableConfigApplicationContext
org.springframework.web.context.support.AbstractRefreshableWebApplicationContext
org.springframework.web.context.support.XmlWebApplicationContext
All Implemented Interfaces:
Closeable, AutoCloseable, Aware, BeanFactory, BeanNameAware, DisposableBean, HierarchicalBeanFactory, InitializingBean, ListableBeanFactory, ApplicationContext, ApplicationEventPublisher, ConfigurableApplicationContext, Lifecycle, MessageSource, EnvironmentCapable, ResourceLoader, ResourcePatternResolver, ThemeSource, ConfigurableWebApplicationContext, WebApplicationContext
abstractApplicationContext#refresh:
public void refresh() throws BeansException, IllegalStateException { synchronized (this.startupShutdownMonitor) { //这里主要是标示spring为激活状态及开始时间,初始化环境部分在进入refresh()方法之前,大部分已完成 //初始化context的环境environment(environment抽象表示spring环境) //主要有systemEnvironment,systemProperties,servletContext,servletConfig,jndi环境等 //对应于web.xml配置的<context-param><init-param>等标签 //环境实际类为StandardServletEnvironment //environment抽象环境的api从spring3.1开始加入 // Prepare this context for refreshing. prepareRefresh(); //注册容器DefaultListableBeanFactory.beanDefinitionMap //<spring源码学习系列2.1-从xml到document> //<spring源码学习系列2.2-从document到beanDefinition> // Tell the subclass to refresh the internal bean factory. ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory(); //beanFactory设置属性,添加后处理器,添加自动装配忽略的接口,自动装配指定值,注册单例(如:environment) //beanFactory自身是不是在singletonObjects里? // Prepare the bean factory for use in this context. prepareBeanFactory(beanFactory); try { //beanFactory添加后置处理器,添加自动装配忽略的接口,注册bean范围,为自动装配指定值,注册单例(如:servletContext,servletConfig,contextAttributes) //跟prepareBeanFactory比较像,对beanFactory进行填充。不过此方法根据英文注释子类覆盖用的,自定义的子类可以覆盖改方法进行一些操作,而上面的prepareBeanFactory是比较通用的。在此环境下是AbstractRefreshableWebApplicationContext重写了postProcessBeanFactory // Allows post-processing of the bean factory in context subclasses. postProcessBeanFactory(beanFactory); //实例化BeanFactoryPostProcessor(getBean)并调用 // Invoke factory processors registered as beans in the context. invokeBeanFactoryPostProcessors(beanFactory); //实例化BeanPostProcessor(getBean)并注册beanPostProcessors // Register bean processors that intercept bean creation. registerBeanPostProcessors(beanFactory); //实例化messageSource(getBean),messageSource这里是context的一个属性 // Initialize message source for this context. initMessageSource(); //实例化applicationEventMulticaster(getBean),applicationEventMulticaster这里是context的一个属性 // Initialize event multicaster for this context. initApplicationEventMulticaster(); //提供了子类实例化其他特殊类,如themeSource。配合<spring:theme>标签使用 // Initialize other special beans in specific context subclasses. onRefresh(); //实例化并注册监听器 //spring的事件也实现了javaapi-EventObject //为什么要放在这个位置,而不是initApplicationEventMulticaster()的下面?它们的关联性更大 // Check for listener beans and register them. registerListeners(); //实例化其他非懒加载的单例bean //<spring源码学习系列2.3-从beanDefinition到instance> // Instantiate all remaining (non-lazy-init) singletons. finishBeanFactoryInitialization(beanFactory); //实例化lifecycleProcessor,并回调smartLifeCycle.onRefresh() //发布刷新完成事件 //注册MBeanServer-JConsole looks at the beans on that server // Last step: publish corresponding event. finishRefresh(); } catch (BeansException ex) { if (logger.isWarnEnabled()) { logger.warn("Exception encountered during context initialization - " + "cancelling refresh attempt: " + ex); } //清除缓存,回调DisposableBean.destory() // Destroy already created singletons to avoid dangling resources. destroyBeans(); // Reset 'active' flag. cancelRefresh(ex); // Propagate exception to caller. throw ex; } } }
要了解这些方法要做什么,除了代码,最好的方式就是看类或方法上的英文注释
为什么父类中方法互相调用,如果子类重写了会调用子类的方法?
spring环境的抽象-environment
spring为什么既实现了某些接口,又将其作为属性?
spring只是对beanFactory messageSource的封装,表明其有怎样的功能及特性。spring还是调用beanFactory或者messageSource等实现其功能
一般直接在eclipse中立即关闭tomcat有什么影响,会不会有些正在消费的消息未被处理?
参考:
https://yd.baidu.com/view/dc2aa92a9ec3d5bbfc0a741e?cn=6-144,6-708&pn=3
http://blog.csdn.net/szwandcj/article/details/50762990
Spring3.1新属性管理API:PropertySource、Environment、Profile
http://jinnianshilongnian.iteye.com/blog/2000183
Spring中Bean初始化实例【重要】
http://uule.iteye.com/blog/2094609
Spring8:一些常用的Spring Bean扩展接口
http://www.cnblogs.com/xrq730/p/5721366.html
【Spring学习25】容器级启动和关闭回调
http://blog.csdn.net/soonfly/article/details/69916806
5. IoC 容器
http://spring.cndocs.tk/beans.html
http://stackoverflow.com/questions/3924727/managementfactory-getplatformmbeanserver-vs-mbeanserverfactory-creatembeanserv
http://stackoverflow.com/questions/13551408/how-does-lifecycle-interface-work-in-spring-what-are-top-level-singleton-beans