110 lines
2.5 KiB
C#
110 lines
2.5 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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namespace System.Reactive
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{
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class NopObserver<T> : IObserver<T>
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{
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public static readonly IObserver<T> Instance = new NopObserver<T>();
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public void OnCompleted()
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{
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}
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public void OnError(Exception error)
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{
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}
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public void OnNext(T value)
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{
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}
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}
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class DoneObserver<T> : IObserver<T>
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{
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public static readonly IObserver<T> Completed = new DoneObserver<T>();
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public Exception Exception { get; set; }
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public void OnCompleted()
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{
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}
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public void OnError(Exception error)
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{
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}
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public void OnNext(T value)
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{
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}
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}
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class DisposedObserver<T> : IObserver<T>
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{
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public static readonly IObserver<T> Instance = new DisposedObserver<T>();
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public void OnCompleted()
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{
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throw new ObjectDisposedException("");
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}
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public void OnError(Exception error)
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{
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throw new ObjectDisposedException("");
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}
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public void OnNext(T value)
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{
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throw new ObjectDisposedException("");
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}
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}
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class Observer<T> : IObserver<T>
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{
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private readonly ImmutableList<IObserver<T>> _observers;
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public Observer(ImmutableList<IObserver<T>> observers)
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{
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_observers = observers;
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}
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public void OnCompleted()
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{
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foreach (var observer in _observers.Data)
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observer.OnCompleted();
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}
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public void OnError(Exception error)
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{
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foreach (var observer in _observers.Data)
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observer.OnError(error);
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}
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public void OnNext(T value)
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{
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foreach (var observer in _observers.Data)
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observer.OnNext(value);
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}
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internal IObserver<T> Add(IObserver<T> observer)
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{
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return new Observer<T>(_observers.Add(observer));
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}
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internal IObserver<T> Remove(IObserver<T> observer)
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{
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var i = Array.IndexOf(_observers.Data, observer);
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if (i < 0)
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return this;
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if (_observers.Data.Length == 2)
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{
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return _observers.Data[1 - i];
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}
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else
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{
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return new Observer<T>(_observers.Remove(observer));
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}
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}
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}
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}
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