Spring Boot 启动源码解析系列六：执行启动方法一

1234567891011121314151617181920212223242526272829303132333435363738394041424344

public ConfigurableApplicationContext (String... args) {

    StopWatch stopWatch = new StopWatch();    // 开始执行，记录开始时间    stopWatch.start();

    ConfigurableApplicationContext context = null;    FailureAnalyzers analyzers = null;    this.configureHeadlessProperty();

    // 获取 SpringApplicationRunListener 实现类，实际只有 EventPublishingRunListener 一个实现类    SpringApplicationRunListeners listeners = this.getRunListeners(args);    // ApplicationStartedEvent 事件监听器执行监听    listeners.starting();

    try {        // 实例化应用程序参数持有类        ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);        // 实例化容器环境配置信息        ConfigurableEnvironment environment = this.prepareEnvironment(listeners, applicationArguments);

        // 打印 Banner        Banner printedBanner = this.printBanner(environment);

        // 实例化 Spring ApplicationContext         context = this.createApplicationContext();        new FailureAnalyzers(context);        this.prepareContext(context, environment, listeners, applicationArguments, printedBanner);        this.refreshContext(context);        this.afterRefresh(context, applicationArguments);

        //         listeners.finished(context, (Throwable)null);        stopWatch.stop();        if (this.logStartupInfo) {            (new StartupInfoLogger(this.mainApplicationClass)).logStarted(this.getApplicationLog(), stopWatch);        }

        return context;    } catch (Throwable var9) {        this.handleRunFailure(context, listeners, (FailureAnalyzers)analyzers, var9);        throw new IllegalStateException(var9);    }}

12

SpringApplicationRunListeners listeners = this.getRunListeners(args);listeners.starting();

1234567891011

public interface SpringApplicationRunListener {    void starting();

    void environmentPrepared(ConfigurableEnvironment var1);

    void contextPrepared(ConfigurableApplicationContext var1);

    void contextLoaded(ConfigurableApplicationContext var1);

    void finished(ConfigurableApplicationContext var1, Throwable var2);}

1234

private SpringApplicationRunListeners getRunListeners(String[] args) {    Class<?>[] types = new Class[]{SpringApplication.class, String[].class};    return new SpringApplicationRunListeners(logger, this.getSpringFactoriesInstances(SpringApplicationRunListener.class, types, this, args));}

123

public void starting() {    this.initialMulticaster.multicastEvent(new ApplicationStartedEvent(this.application, this.args));}

12345678910111213141516171819

public void multicastEvent(final ApplicationEvent event, ResolvableType eventType) {    ResolvableType type = eventType != null ? eventType : this.resolveDefaultEventType(event);    Iterator var4 = this.getApplicationListeners(event, type).iterator();

    while(var4.hasNext()) {        final ApplicationListener<?> listener = (ApplicationListener)var4.next();        Executor executor = this.getTaskExecutor();        if (executor != null) {            executor.execute(new Runnable() {                public void () {                    SimpleApplicationEventMulticaster.this.invokeListener(listener, event);                }            });        } else {            this.invokeListener(listener, event);        }    }

}