public EventObserver(EventSubscription sub, IObserver <Event> observer)
{
_sub = sub;
_observer = observer;
}
/// <summary>
/// Creates an observable event producer.
/// </summary>
/// <param name="sub">The subscription.</param>
public EventObservable(EventSubscription sub)
{
_sub = sub;
_observable = sub._queue.AsObservable();
}