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AbstractApplicationEventMulticaster populates ListenerRetriever cache in fully synchronized fashion 

Issue: SPR-12545
(cherry picked from commit 2b0ada9)
This commit is contained in:
Juergen Hoeller 2014-12-22 15:46:58 +01:00
parent c087e51b80
commit 61a6bc0139
1 changed files with 61 additions and 35 deletions
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44
spring-context/src/main/java/org/springframework/context/event/AbstractApplicationEventMulticaster.java
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@ -153,12 +153,44 @@ public abstract class AbstractApplicationEventMulticaster
Object source = event.getSource();
Class<?> sourceType = (source != null ? source.getClass() : null);
ListenerCacheKey cacheKey = new ListenerCacheKey(eventType, sourceType);
// Quick check for existing entry on ConcurrentHashMap...
ListenerRetriever retriever = this.retrieverCache.get(cacheKey);
if (retriever != null) {
return retriever.getApplicationListeners();
}
else {
if (this.beanClassLoader == null ||
(ClassUtils.isCacheSafe(eventType, this.beanClassLoader) &&
(sourceType == null || ClassUtils.isCacheSafe(sourceType, this.beanClassLoader)))) {
// Fully synchronized building and caching of a ListenerRetriever
synchronized (this.defaultRetriever) {
retriever = this.retrieverCache.get(cacheKey);
if (retriever != null) {
return retriever.getApplicationListeners();
}
retriever = new ListenerRetriever(true);
Collection<ApplicationListener<?>> listeners = retrieveApplicationListeners(event, sourceType, retriever);
this.retrieverCache.put(cacheKey, retriever);
return listeners;
}
}
else {
// No ListenerRetriever caching -> no synchronization necessary
return retrieveApplicationListeners(event, sourceType, null);
}
}
/**
* Actually retrieve the application listeners for the given event and source type.
* @param event the application event
* @param sourceType the event source type
* @param retriever the ListenerRetriever, if supposed to populate one (for caching purposes)
* @return the pre-filtered list of application listeners for the given event and source type
*/
private Collection<ApplicationListener<?>> retrieveApplicationListeners(
ApplicationEvent event, Class<?> sourceType, ListenerRetriever retriever) {
LinkedList<ApplicationListener<?>> allListeners = new LinkedList<ApplicationListener<?>>();
Set<ApplicationListener<?>> listeners;
Set<String> listenerBeans;
@ -167,7 +199,7 @@ public abstract class AbstractApplicationEventMulticaster
listenerBeans = new LinkedHashSet<String>(this.defaultRetriever.applicationListenerBeans);
}
for (ApplicationListener<?> listener : listeners) {
if (supportsEvent(listener, eventType, sourceType)) {
if (supportsEvent(listener, event.getClass(), sourceType)) {
retriever.applicationListeners.add(listener);
allListeners.add(listener);
}
@ -180,7 +212,7 @@ public abstract class AbstractApplicationEventMulticaster
if (listenerType == null || supportsEvent(listenerType, event)) {
ApplicationListener<?> listener =
beanFactory.getBean(listenerBeanName, ApplicationListener.class);
if (!allListeners.contains(listener) && supportsEvent(listener, eventType, sourceType)) {
if (!allListeners.contains(listener) && supportsEvent(listener, event.getClass(), sourceType)) {
retriever.applicationListenerBeans.add(listenerBeanName);
allListeners.add(listener);
}
@ -193,14 +225,8 @@ public abstract class AbstractApplicationEventMulticaster
}
}
OrderComparator.sort(allListeners);
if (this.beanClassLoader == null ||
(ClassUtils.isCacheSafe(eventType, this.beanClassLoader) &&
(sourceType == null || ClassUtils.isCacheSafe(sourceType, this.beanClassLoader)))) {
this.retrieverCache.put(cacheKey, retriever);
}
return allListeners;
}
}
/**
* Filter a listener early through checking its generically declared event