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namespace System.Reactive
{
class NopObserver<T> : IObserver<T>
{
public static readonly IObserver<T> Instance = new NopObserver<T>();
public void OnCompleted()
{
}
public void OnError(Exception error)
{
}
public void OnNext(T value)
{
}
}
class DoneObserver<T> : IObserver<T>
{
public static readonly IObserver<T> Completed = new DoneObserver<T>();
public Exception Exception { get; set; }
public void OnCompleted()
{
}
public void OnError(Exception error)
{
}
public void OnNext(T value)
{
}
}
class DisposedObserver<T> : IObserver<T>
{
public static readonly IObserver<T> Instance = new DisposedObserver<T>();
public void OnCompleted()
{
throw new ObjectDisposedException("");
}
public void OnError(Exception error)
{
throw new ObjectDisposedException("");
}
public void OnNext(T value)
{
throw new ObjectDisposedException("");
}
}
class Observer<T> : IObserver<T>
{
private readonly ImmutableList<IObserver<T>> _observers;
public Observer(ImmutableList<IObserver<T>> observers)
{
_observers = observers;
}
public void OnCompleted()
{
foreach (var observer in _observers.Data)
observer.OnCompleted();
}
public void OnError(Exception error)
{
foreach (var observer in _observers.Data)
observer.OnError(error);
}
public void OnNext(T value)
{
foreach (var observer in _observers.Data)
observer.OnNext(value);
}
internal IObserver<T> Add(IObserver<T> observer)
{
return new Observer<T>(_observers.Add(observer));
}
internal IObserver<T> Remove(IObserver<T> observer)
{
var i = Array.IndexOf(_observers.Data, observer);
if (i < 0)
return this;
if (_observers.Data.Length == 2)
{
return _observers.Data[1 - i];
}
else
{
return new Observer<T>(_observers.Remove(observer));
}
}
}
}
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