public void RegisterUpdateNotification(ContinuousQueryItemUpdatedCallback itemUpdatedCallback)
{
if (itemUpdatedCallback != null)
{
_itemUpdated += itemUpdatedCallback;
lock (syncLock)
{
if (++refupdate == 1)
{
updateCallback =
new QueryDataNotificationCallback(_notificationsWrapper.OnQueryChangeNotifiation);
this.RegisterNotification(updateCallback, EventType.ItemUpdated, EventDataFilter.None);
}
}
}
else
{
_itemUpdated = null;
lock (syncLock)
{
if (refupdate > 0)
{
refupdate = 0;
this.UnRegisterNotification(updateCallback, EventType.ItemUpdated);
}
}
}
}
internal void OnItemUpdated(string key, bool notifyAsync)
{
if (_itemUpdated != null)
{
Delegate[] dltList = _itemUpdated.GetInvocationList();
for (int i = dltList.Length - 1; i >= 0; i--)
{
ContinuousQueryItemUpdatedCallback subscriber = (ContinuousQueryItemUpdatedCallback)dltList[i];
try
{
if (notifyAsync)
{
#if !NETCORE
subscriber.BeginInvoke(key, new System.AsyncCallback(ItemUpdatedAsyncCallbackHandler),
subscriber);
#elif NETCORE
TaskFactory factory = new TaskFactory();
Task task = factory.StartNew(() => subscriber(key));
#endif
}
else
{
subscriber(key);
}
}
catch (Exception e)
{
}
}
}
}
private void ItemUpdatedAsyncCallbackHandler(IAsyncResult ar)
{
ContinuousQueryItemUpdatedCallback subscribber = (ContinuousQueryItemUpdatedCallback)ar.AsyncState;
try
{
subscribber.EndInvoke(ar);
}
catch (Exception e)
{
}
}
