刷新IOC容器 refreshContext
private void refreshContext(ConfigurableApplicationContext context) {
if (this.registerShutdownHook) {
try {
context.registerShutdownHook();
}
catch (AccessControlException ex) {
// Not allowed in some environments.
}
}
//spring的核心源码
refresh((ApplicationContext) context);
}
==============进入refresh((ApplicationContext) context);
@Deprecated
protected void refresh(ApplicationContext applicationContext) {
Assert.isInstanceOf(ConfigurableApplicationContext.class, applicationContext);
refresh((ConfigurableApplicationContext) applicationContext);
}
protected void refresh(ConfigurableApplicationContext applicationContext) {
applicationContext.refresh();
}
@Override
public final void refresh() throws BeansException, IllegalStateException {
try {
super.refresh();
}
catch (RuntimeException ex) {
WebServer webServer = this.webServer;
if (webServer != null) {
webServer.stop();
}
throw ex;
}
}
//spring ioc容器的经典的初始化过程
public void refresh() throws BeansException, IllegalStateException {
Object var1 = this.startupShutdownMonitor;
synchronized(this.startupShutdownMonitor) {
StartupStep contextRefresh = this.applicationStartup.start("spring.context.refresh");
this.prepareRefresh();
ConfigurableListableBeanFactory beanFactory = this.obtainFreshBeanFactory();
this.prepareBeanFactory(beanFactory);
try {
this.postProcessBeanFactory(beanFactory);
StartupStep beanPostProcess = this.applicationStartup.start("spring.context.beans.post-process");
this.invokeBeanFactoryPostProcessors(beanFactory);
this.registerBeanPostProcessors(beanFactory);
beanPostProcess.end();
this.initMessageSource();
this.initApplicationEventMulticaster();
this.onRefresh();
this.registerListeners();
//实例化容器中所有的组件
this.finishBeanFactoryInitialization(beanFactory);
this.finishRefresh();
} catch (BeansException var10) {
if (this.logger.isWarnEnabled()) {
this.logger.warn("Exception encountered during context initialization - cancelling refresh attempt: " + var10);
}
this.destroyBeans();
this.cancelRefresh(var10);
throw var10;
} finally {
this.resetCommonCaches();
contextRefresh.end();
}
}
}callRunners(context, applicationArguments)
private void callRunners(ApplicationContext context, ApplicationArguments args) {
//准备runners集合
List@FunctionalInterface
public interface ApplicationRunner {
/**
* Callback used to run the bean.
* @param args incoming application arguments
* @throws Exception on error
*/
void run(ApplicationArguments args) throws Exception;
}
@FunctionalInterface
public interface CommandLineRunner {
/**
* Callback used to run the bean.
* @param args incoming main method arguments
* @throws Exception on error
*/
void run(String... args) throws Exception;
}handleRunFailure(context, ex, listeners);
private void handleRunFailure(ConfigurableApplicationContext context, Throwable exception,
SpringApplicationRunListeners listeners) {
try {
try {
handleExitCode(context, exception);
if (listeners != null) {
//调用listeners.failed(context, exception);
listeners.failed(context, exception);
}
}
finally {
reportFailure(getExceptionReporters(context), exception);
if (context != null) {
context.close();
}
}
}
catch (Exception ex) {
logger.warn("Unable to close ApplicationContext", ex);
}
ReflectionUtils.rethrowRuntimeException(exception);
}//如果有异常，继续捕获异常
handleRunFailure(context, ex, null);
private void handleRunFailure(ConfigurableApplicationContext context, Throwable exception,
SpringApplicationRunListeners listeners) {
try {
try {
handleExitCode(context, exception);
if (listeners != null) {
//running如果有问题。继续通知 failed 。
//调用所有 Listener 的failed；通知所有的监听器 failed当前项目运行失败
listeners.failed(context, exception);
}
}
finally {
reportFailure(getExceptionReporters(context), exception);
if (context != null) {
context.close();
}
}
}
catch (Exception ex) {
logger.warn("Unable to close ApplicationContext", ex);
}
ReflectionUtils.rethrowRuntimeException(exception);
}