private Collection
    
     > retrieveApplicationListeners(ResolvableType eventType, Class
      sourceType, AbstractApplicationEventMulticaster.ListenerRetriever retriever) {
      LinkedList allListeners = new LinkedList();     Object beanFactory = this.retrievalMutex;     LinkedHashSet listeners;     LinkedHashSet listenerBeans;     synchronized(this.retrievalMutex) {
          listeners = new LinkedHashSet(this.defaultRetriever.applicationListeners);         listenerBeans = new LinkedHashSet(this.defaultRetriever.applicationListenerBeans);     }     Iterator beanFactory1 = listeners.iterator();     while(beanFactory1.hasNext()) {
          ApplicationListener listener = (ApplicationListener)beanFactory1.next();         if(this.supportsEvent(listener, eventType, sourceType)) {
              if(retriever != null) {
                  retriever.applicationListeners.add(listener);             }             allListeners.add(listener);         }     }     if(!listenerBeans.isEmpty()) {
          BeanFactory beanFactory2 = this.getBeanFactory();         Iterator listener2 = listenerBeans.iterator();         while(listener2.hasNext()) {
              String listenerBeanName = (String)listener2.next();             try {
                  Class listenerType = beanFactory2.getType(listenerBeanName);                 if(listenerType == null || this.supportsEvent(listenerType, eventType)) {
                      ApplicationListener listener1 = (ApplicationListener)beanFactory2.getBean(listenerBeanName, ApplicationListener.class);                     if(!allListeners.contains(listener1) && this.supportsEvent(listener1, eventType, sourceType)) {
                          if(retriever != null) {
                              retriever.applicationListenerBeans.add(listenerBeanName);                         }                         allListeners.add(listener1);                     }                 }             } catch (NoSuchBeanDefinitionException var13) {
                  ;             }         }     }     AnnotationAwareOrderComparator.sort(allListeners);     return allListeners; }
    

org.springframework.context.event.AbstractApplicationEventMulticaster