Bean实例化之后
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;
}
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Bean销毁之前
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
}
}
}
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以上就是ApplicationListenerDetector监听器判断demo的详细内容，更多关于ApplicationListenerDetector监听器的资料请关注其它相关文章！
原文链接：https://juejin.cn/post/7204712464642981925/
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