public override Task OnDisconnectedAsync(Exception exception)
{
_connections.TryRemove(Context.ConnectionId, out _);
// Stop the Boinc background update loop if nobody is on the site.
//
// 'Count' operation in the ConcurrentDictionary cause it to acquire all the locks at once.
// Alternative method, is the lock-free enumerator: concurrentDictionary.Skip(0).Count(), because it uses LINQ
if (_connections.Skip(0).Count() == 0)
{
// Manager stops after 30 seconds
_manager.Stop(30000).ContinueWith(task => Console.WriteLine("Error: BoincInfoHub.OnDisconnectedAsync: " + task.Exception), TaskContinuationOptions.OnlyOnFaulted);
}
return(base.OnDisconnectedAsync(exception));
}
