org.springframework.context.event.AbstractApplicationEventMulticaster

private Collection<ApplicationListener<?>> 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;}