spring boot 监听容器启动代码实例
人气:0在使用Spring框架开发时, 有时我们需要在spring容器初始化完成后做一些操作, 那么我们可以通过自定义ApplicationListener 来实现.
自定义监听器
@Component public class MyApplicationListener implements ApplicationListener<ContextRefreshedEvent> { @Override public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) { // 获取spring 上下文 ApplicationContext applicationContext = contextRefreshedEvent.getApplicationContext(); // do your work... }
源码分析
springboot 启动应用, 执行 SpringApplication.run(String… args) 方法
run方法中执行完初始化上下文方法后, 会执行this.refreshContext方法, 刷新
经过一堆方法跳转, 执行 AbstractApplicationContextl类的publishEvent(Object event, @Nullable ResolvableType eventType) 方法
然后执行 SimpleApplicationEventMulticaster.multicastEvent(ApplicationEvent event, @Nullable ResolvableType eventType)
然后依次执行所有监听器的onApplicationEvent()方法
// 遍历所有ApplicationListeners, 依次执行ApplicationListener 的onApplicationEvent()方法 public void multicastEvent(ApplicationEvent event, @Nullable ResolvableType eventType) { ResolvableType type = eventType != null ? eventType : this.resolveDefaultEventType(event); Iterator var4 = this.getApplicationListeners(event, type).iterator(); while(var4.hasNext()) { ApplicationListener<?> listener = (ApplicationListener)var4.next(); Executor executor = this.getTaskExecutor(); if (executor != null) { executor.execute(() -> { this.invokeListener(listener, event); }); } else { this.invokeListener(listener, event); } } }
您可能感兴趣的文章:
加载全部内容