时间:2023-03-15来源:系统城装机大师作者:佚名
判断Bean是否是监听器,如果是监听器就将当前Bean加入监听器集合
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public Object postProcessAfterInitialization(Object bean, String beanName) { if (bean instanceof ApplicationListener) { // potentially not detected as a listener by getBeanNamesForType retrieval Boolean flag = this .singletonNames.get(beanName); if (Boolean.TRUE.equals(flag)) { // singleton bean (top-level or inner): register on the fly this .applicationContext.addApplicationListener((ApplicationListener<?>) bean); } else if (Boolean.FALSE.equals(flag)) { if (logger.isWarnEnabled() && ! this .applicationContext.containsBean(beanName)) { // inner bean with other scope - can't reliably process events logger.warn( "Inner bean '" + beanName + "' implements ApplicationListener interface " + "but is not reachable for event multicasting by its containing ApplicationContext " + "because it does not have singleton scope. Only top-level listener beans are allowed " + "to be of non-singleton scope." ); } this .singletonNames.remove(beanName); } } return bean; } |
如果当前Bean是监听器,就将当前Bean从监听器集合中移除
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public void postProcessBeforeDestruction(Object bean, String beanName) { if (bean instanceof ApplicationListener) { try { ApplicationEventMulticaster multicaster = this .applicationContext.getApplicationEventMulticaster(); multicaster.removeApplicationListener((ApplicationListener<?>) bean); multicaster.removeApplicationListenerBean(beanName); } catch (IllegalStateException ex) { // ApplicationEventMulticaster not initialized yet - no need to remove a listener } } } |
以上就是ApplicationListenerDetector监听器判断demo的详细内容
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