internal short RegisterSelectiveCallback(CacheItemUpdatedCallback updateCallback)
{
if (updateCallback == null)
{
return(-1);
}
SelectiveUpdateCallbackWrapper callbackWrapper = null;
lock (SyncLockSelective)
{
// callback is not already registered with the same method, so add
if (_oldSelectiveCallbackPool.GetResource(updateCallback) == null)
{
callbackWrapper = new SelectiveUpdateCallbackWrapper(updateCallback);
_oldSelectiveCallbackPool.AddResource(updateCallback, callbackWrapper);
_oldSelectiveMappingCallbackPool.AddResource(callbackWrapper, updateCallback);
}
// already present against the same method, so no need to add again.
else
{
callbackWrapper =
(SelectiveUpdateCallbackWrapper)_oldSelectiveCallbackPool.GetResource(updateCallback);
_oldSelectiveCallbackPool.AddResource(updateCallback, callbackWrapper); //to increment the refcount
}
short[] callbackIds = RegisterSelectiveEvent(callbackWrapper.MappingCallback, EventType.ItemUpdated,
EventDataFilter.None);
return(callbackIds[0]);
}
}
internal short UnRegisterSelectiveCallback(CacheItemUpdatedCallback updateCallback)
{
if (updateCallback == null)
{
return(-1);
}
lock (SyncLockSelective)
{
SelectiveUpdateCallbackWrapper callbackWrapper =
(SelectiveUpdateCallbackWrapper)_oldSelectiveCallbackPool.GetResource(updateCallback);
// For selective callback, we dont remove the callback from resource pool as it can create chaos if user try to unregister
//a callback more then one time or against wrong items.
if (callbackWrapper != null)
{
short[] callbackIds = RegisterSelectiveEvent(callbackWrapper.MappingCallback, EventType.ItemUpdated,
EventDataFilter.None);
return(callbackIds[0]);
}
return(-1);
}
}