refreshContext() 刷新上下文
private void refreshContext(ConfigurableApplicationContext context) {
/**
* cintext = AnnotationConfigApplicationContext
*/
refresh(context);
if (this.registerShutdownHook) {
try {
context.registerShutdownHook();
}catch (AccessControlException ex) {
// Not allowed in some environments.
}
}
}
这里的参数context传的是AnnotationConfigApplicationContext类的继承图如下
调用refresh()方法
protected void refresh(ApplicationContext applicationContext) {
Assert.isInstanceOf(AbstractApplicationContext.class, applicationContext);
((AbstractApplicationContext) applicationContext).refresh();
}
这里的refresh()调用的spring源码中的spring-context中的内容,也是spring框架bean装载的核心
@Override
public void refresh() throws BeansException, IllegalStateException {
synchronized (this.startupShutdownMonitor) {
// Prepare this context for refreshing.
prepareRefresh();
// Tell the subclass to refresh the internal bean factory.
ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();
// Prepare the bean factory for use in this context.
prepareBeanFactory(beanFactory);
try {
// Allows post-processing of the bean factory in context subclasses.
postProcessBeanFactory(beanFactory);
// Invoke factory processors registered as beans in the context.
invokeBeanFactoryPostProcessors(beanFactory);
// Register bean processors that intercept bean creation.
registerBeanPostProcessors(beanFactory);
// Initialize message source for this context.
initMessageSource();
// Initialize event multicaster for this context.
initApplicationEventMulticaster();
// Initialize other special beans in specific context subclasses.
onRefresh();
// Check for listener beans and register them.
registerListeners();
// Instantiate all remaining (non-lazy-init) singletons.
finishBeanFactoryInitialization(beanFactory);
// Last step: publish corresponding event.
finishRefresh();
}
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();
// Reset 'active' flag.
cancelRefresh(ex);
// 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();
}
}
}
prepareRefresh()方法
protected void prepareRefresh() {
// IOC容器启动时间
this.startupDate = System.currentTimeMillis();
//容器标识
this.closed.set(false);
//容器激活标识
this.active.set(true);
if (logger.isDebugEnabled()) {
if (logger.isTraceEnabled()) {
logger.trace("Refreshing " + this);
}else {
logger.debug("Refreshing " + getDisplayName());
}
}
// 留给子类实现,初始化系统资源
initPropertySources();
// Validate that all properties marked as required are resolvable:
// 创建并获取环境对象,验证需要的属性文件是否都放入到环境中
getEnvironment().validateRequiredProperties();
// 判断刷新前的应用程序监听器集合是否为空,如果为空,则将监听器添加到此集合中
if (this.earlyApplicationListeners == null) {
this.earlyApplicationListeners = new LinkedHashSet<>(this.applicationListeners);
}else {
// 如果不等于空,则清空集合元素对象
this.applicationListeners.clear();
this.applicationListeners.addAll(this.earlyApplicationListeners);
}
// Allow for the collection of early ApplicationEvents,
// 创建刷新前的监听事件集合
this.earlyApplicationEvents = new LinkedHashSet<>();
}
标签:SpringBoot,beanFactory,refreshContext,refresh,bean,源码,ex,context,logger
From: https://www.cnblogs.com/gushilcy/p/17576650.html