private void OnNewHeaderAdding()
{
Hub.Default.Subscribe((List <NewsLine> headers) =>
{
Task.Run(async() =>
{
var subscriptions = SubscriptionRepository.GetAllSubscriptions();
var messages = headers.SelectMany(m =>
subscriptions.Where(s => s.LastArticleTime == null || s.LastArticleTime.Value < m.GetTime())
.Select(subscription => new SubscriptionMessage(subscription, m))).ToList();
await TelegramService.SendMessages(messages);
UpdateLastArticleTimes(subscriptions, messages);
}).GetAwaiter().GetResult();
});
}