async void StartPollNotifications()
{
if (NotificationsObservable == null || filterNotificationsEnd != null)
{
return;
}
StopPollNotifications();
notificationsCancellationSource = new CancellationTokenSource();
Debug.WriteLine("NTF POLL START");
await ClientService.Current.PollNotifications((notificationsPolled) =>
{
foreach (Notification notification in notificationsPolled)
{
NotificationsObservable.Insert(0, notification);
}
}, deviceId, NotificationsObservable.Any()?(DateTime?)NotificationsObservable.Max(n => n.Timestamp.Value) : filterNotificationsStart, notificationsCancellationSource.Token);
Debug.WriteLine("NTF POLL END");
}
async Task StartNotificationsSubscription()
{
// TODO check that already started
if (filterNotificationsEnd != null)
{
return;
}
await StopNotificationsSubscription();
Debug.WriteLine("NTF subscription START");
try
{
notificationsSubscription = await ClientService.Current.AddNotificationSubscriptionAsync(new[] { deviceId }, null, async (notificationReceived) =>
{
await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
lock (NotificationsObservable)
{
if (!NotificationsObservable.Any(c => c.Id == notificationReceived.Notification.Id))
{
NotificationsObservable.Insert(0, notificationReceived.Notification);
}
}
});
});
Debug.WriteLine("NTF subscription END");
}
catch (Exception ex)
{
Debug.WriteLine("NTF subscription FAILED: " + ex.Message);
if (!wasSubscriptionError)
{
new MessageDialog(ex.Message, "Can't subscribe to notifications").ShowAsync();
wasSubscriptionError = true;
}
}
}