public async static void DequeueTask(object state)
{
CancellationToken token = (CancellationToken)state;
while (!token.IsCancellationRequested)
{
if (dequeueSignal.WaitOne()) // block untill we have items in the queue
{
NotificationDelivery delivery = null;
if (deliveryQueue.TryDequeue(out delivery))
{
NotificationDeliveryStatus ns = NotificationDeliveryStatus.Pending;
if (delivery.Subscription.Status == SubscriptionStatus.Subscribed)
{
PushResult result = await PushService.DoPushAsync(delivery);
switch (result)
{
case PushResult.Pushed:
ns = NotificationDeliveryStatus.Delivered;
break;
case PushResult.Error:
ns = NotificationDeliveryStatus.FailureError;
break;
case PushResult.NotSupported:
ns = NotificationDeliveryStatus.FailureNotSupported;
break;
case PushResult.UnSubscribed:
ns = NotificationDeliveryStatus.FailureUnSubscribed;
delivery.Subscription.Status = SubscriptionStatus.UnSubscribed;
break;
}
}
else
{
ns = NotificationDeliveryStatus.FailureUnSubscribed;
}
delivery.Status = ns;
delivery.DeliveredAt = DateTime.Now;
}
else
{
// empty queue, no more items
// stop dequeueing untill new items added by EnqueueTask
dequeueSignal.Reset();
}
}
}
}
private async Task SetDeliveryStatus(int deliveryId, NotificationDeliveryStatus status)
{
var delivery = db.NotificationDeliveries.Find(deliveryId);
if (delivery == null)
{
return;
}
delivery.Status = status;
await db.SaveChangesAsync();
}
private async Task SetDeliveryStatusAsync(int deliveryId, NotificationDeliveryStatus status)
{
var delivery = await db.NotificationDeliveries.FindAsync(deliveryId).ConfigureAwait(false);
if (delivery == null)
{
return;
}
delivery.Status = status;
await db.SaveChangesAsync().ConfigureAwait(false);
}
