JCS通知过期/删除 [英] JCS notify on expire/remove

问题描述

我们非常简单地使用JCS.没有分发或任何东西，简单地:

we use JCS very simply. Not distributed or anything, simply:

JCS jcs = JCS.getInstance("region-name");

我正在尝试注册某种侦听器，当从缓存中删除元素或使元素过期时，该侦听器可用于接收通知/事件...

I'm trying to register some kind of listener that can be used to receive a notification/event when an element is removed or expired from the cache...

我已经研究了JCS javadoc一段时间了，并且尝试了: -在高速缓存的默认ElementAttributes中添加IElementEventHandler的实现...永远不会被调用. -使用ICacheObserver的各种实现来注册ICacheListener，但是永远不会被调用.我不一定要确定这一点是正确的方法，因为我认为这是为了更高级地使用JCS ...

I've been digging through the JCS javadoc for awhile now and I've tried: - adding an Implementation of IElementEventHandler to the default ElementAttributes of the cache ... it never gets called. - using the various implementations of ICacheObserver to register an ICacheListener but that never gets called either. I'm not necessarily sure this point is the correct way of doing it as I think this is intended for more advanced uses of JCS ...

有人知道(或是否有可能)注册某种类型的侦听器/观察者/什么东西来完成此任务?我的最终目标是基本上可以从缓存中删除某些内容时得到通知...我并不特别在乎它是不是一个巨大的麻烦:P

Does anyone know how (or if it's possible) to register some kind of listener/obsverver/whatever that will accomplish this? My final goal is to be able to be notified of when something is removed from the cache basically ... I don't particularly care about how provided it isn't a massive kludge :P

推荐答案

创建一个抽象类，注册您有兴趣捕获的事件.这对我有用，以捕获这两个事件.

Create an abstract class that registers the events your interested in capturing. This works for me to capture the two events.

  private static final Set<Integer> EVENTS = new HashSet<Integer>();
  {
    EVENTS.add(IElementEventHandler.ELEMENT_EVENT_EXCEEDED_IDLETIME_BACKGROUND);
    EVENTS.add(IElementEventHandler.ELEMENT_EVENT_EXCEEDED_MAXLIFE_BACKGROUND);
  }

  @Override
  public synchronized void handleElementEvent(IElementEvent event) {
   // Check for element expiration based on EVENTS.
   LOG.debug("Handling event of type : " + event.getElementEvent() + ".");
   if (EVENTS.contains(event.getElementEvent())) {
     ElementEvent elementEvent = (ElementEvent)event;
     CacheElement element = (CacheElement)elementEvent.getSource();
     handleEvent(element);
   }

  }
  // Abstract method to handle events
  protected abstract void handleEvent(CacheElement element);
  }

按如下所示将此抽象事件处理程序添加到jcs工厂定义中

Add this abstract event handler to the jcs factory definition as follows

     JCS jcs = JCSCacheFactory.getCacheInstance(regionName);
     IElementAttributes attributes = jcs.getDefaultElementAttributes();
     attributes.addElementEventHandler(handler);
     jcs.setDefaultElementAttributes(attributes);

这篇关于JCS通知过期/删除的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！