private Task ExecuteHubEvent(IRequest request, string connectionId, Func <IHub, Task> action)
{
var hubs = GetHubs(request, connectionId).ToList();
var operations = hubs.Select(instance => action(instance).OrEmpty().Catch(Trace)).ToArray();
if (operations.Length == 0)
{
DisposeHubs(hubs);
return(TaskAsyncHelper.Empty);
}
var tcs = new DispatchingTaskCompletionSource <object>();
Task.Factory.ContinueWhenAll(operations, tasks =>
{
DisposeHubs(hubs);
var faulted = tasks.FirstOrDefault(t => t.IsFaulted);
if (faulted != null)
{
tcs.SetUnwrappedException(faulted.Exception);
}
else if (tasks.Any(t => t.IsCanceled))
{
tcs.SetCanceled();
}
else
{
tcs.SetResult(null);
}
});
return(tcs.Task);
}