public void RegisterRemoveNotification(ContinuousQueryItemRemovedCallback itemRemovedCallback)
{
if (itemRemovedCallback != null)
{
_itemRemoved += itemRemovedCallback;
lock (syncLock)
{
if (++refremove == 1)
{
removeCallback =
new QueryDataNotificationCallback(_notificationsWrapper.OnQueryChangeNotifiation);
this.RegisterNotification(removeCallback, EventType.ItemRemoved,
EventDataFilter.DataWithMetadata);
}
}
}
else
{
_itemRemoved = null;
lock (syncLock)
{
if (refremove > 0)
{
refremove = 0;
this.UnRegisterNotification(removeCallback, EventType.ItemRemoved);
}
}
}
}
internal void OnItemRemoved(string key, bool notifyAsync)
{
if (_itemRemoved != null)
{
Delegate[] dltList = _itemRemoved.GetInvocationList();
for (int i = dltList.Length - 1; i >= 0; i--)
{
ContinuousQueryItemRemovedCallback subscriber = (ContinuousQueryItemRemovedCallback)dltList[i];
try
{
if (notifyAsync)
{
#if !NETCORE
subscriber.BeginInvoke(key, new System.AsyncCallback(ItemRemovedAsyncCallbackHandler),
subscriber);
#elif NETCORE
TaskFactory factory = new TaskFactory();
Task task = factory.StartNew(() => subscriber(key));
#endif
}
else
{
subscriber(key);
}
}
catch (Exception e)
{
}
}
}
}
private void ItemRemovedAsyncCallbackHandler(IAsyncResult ar)
{
ContinuousQueryItemRemovedCallback subscribber = (ContinuousQueryItemRemovedCallback)ar.AsyncState;
try
{
subscribber.EndInvoke(ar);
}
catch (Exception e)
{
}
}
