private void StartExecution()
{
while (!_cancellationToken.IsCancellationRequested)
{
_manualResetEvent.WaitOne();
while (_executionQueue.Count > 0)
{
ObserverItem item = default;
lock (_lock)
{
item = _executionQueue.Dequeue();
}
//we can get an exception here if item in queue is bad
//NRE for example
if (item.HasException)
{
_observer.OnError(item.Exception);
}
else if (!item.IsLastElement)
{
_observer.OnNext(item.Value);
}
else
{
_observer.OnCompleted();
//we do nothing, when execution was completed
//in theory we can still receive items, but I'm not process it, because this class just a wrapper for background consuming
}
}
_manualResetEvent.Reset();
}
}
public IDisposable Subscribe(IObserver <T> observer)
{
ObserverItem item = new ObserverItem(observer, this);
_observerItems.Add(item);
return(item);
}
private void Enqueue(ObserverItem item)
{
lock (_lock)
{
_executionQueue.Enqueue(item);
}
_manualResetEvent.Set();
}
public void EnqueueLast() => Enqueue(ObserverItem.FromLast());
public void EnqueueError(Exception exception) => Enqueue(ObserverItem.FromException(exception));
public void EnqueueNext(T value) => Enqueue(ObserverItem.FromValue(value));
