spring 源码解读八 initApplicationEventMulticaster()

最新推荐文章于 2024-05-20 21:14:24 发布

luhaichuan88

最新推荐文章于 2024-05-20 21:14:24 发布

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initApplicationEventMulticaster 初始化事件广播器

/**
	 * Initialize the ApplicationEventMulticaster.
	 * Uses SimpleApplicationEventMulticaster if none defined in the context.
	 * @see org.springframework.context.event.SimpleApplicationEventMulticaster
	 */
	protected void initApplicationEventMulticaster() {
		
		ConfigurableListableBeanFactory beanFactory = getBeanFactory();
		/**
		 * 获取之前创建的 DefaultListableBeanFactory是 ConfigurableListableBeanFactory 的实现类
		 * 从 beanFactory中获取 beanName为 applicationEventMulticaster 的bean
		 * 如果没有则新建一个默认的 SimpleApplicationEventMulticaster
		 * */
		
		if (beanFactory.containsLocalBean(APPLICATION_EVENT_MULTICASTER_BEAN_NAME)) {
			this.applicationEventMulticaster =
					beanFactory.getBean(APPLICATION_EVENT_MULTICASTER_BEAN_NAME, ApplicationEventMulticaster.class);
			if (logger.isTraceEnabled()) {
				logger.trace("Using ApplicationEventMulticaster [" + this.applicationEventMulticaster + "]");
			}
		}
		else {
			this.applicationEventMulticaster = new SimpleApplicationEventMulticaster(beanFactory);
			beanFactory.registerSingleton(APPLICATION_EVENT_MULTICASTER_BEAN_NAME, this.applicationEventMulticaster);
			if (logger.isTraceEnabled()) {
				logger.trace("No '" + APPLICATION_EVENT_MULTICASTER_BEAN_NAME + "' bean, using " +
						"[" + this.applicationEventMulticaster.getClass().getSimpleName() + "]");
			}
		}
	}