public static IEnumerable <Patient> DoQuery(CancellationToken token)
{
Random random = new Random();
foreach (var item in PatientFactory.GeneratePatient(random.Next(20, 100)))
{
if (token.IsCancellationRequested)
{
yield break;
}
yield return(item);
}
}
private void DoQuery(IObserver <WorklistQueryEvent> observer)
{
lock (_mutex)
{
if (_queryTask.Task.IsCompleted == false)
{
return;
}
_queryTask = new TaskCompletionSource <bool>();
_tokenSource = new CancellationTokenSource();
}
observer.OnNext(WorklistQueryEvent.StartEvent());
foreach (var item in PatientFactory.DoQuery(_tokenSource.Token))
{
var @event = WorklistQueryEvent.NewPatient(item);
observer.OnNext(@event);
}
observer.OnNext(WorklistQueryEvent.EndEvent());
lock (_mutex)
{
_queryTask.SetResult(true);
}
}