51 lines
1.5 KiB
C#
51 lines
1.5 KiB
C#
// Licensed to the .NET Foundation under one or more agreements.
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// The .NET Foundation licenses this file to you under the MIT License.
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// See the LICENSE file in the project root for more information.
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namespace System.Reactive.Linq.ObservableImpl
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{
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internal sealed class Defer<TValue> : Producer<TValue, Defer<TValue>._>, IEvaluatableObservable<TValue>
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{
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private readonly Func<IObservable<TValue>> _observableFactory;
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public Defer(Func<IObservable<TValue>> observableFactory)
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{
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_observableFactory = observableFactory;
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}
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protected override _ CreateSink(IObserver<TValue> observer) => new(_observableFactory, observer);
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protected override void Run(_ sink) => sink.Run();
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public IObservable<TValue> Eval() => _observableFactory();
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internal sealed class _ : IdentitySink<TValue>
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{
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private readonly Func<IObservable<TValue>> _observableFactory;
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public _(Func<IObservable<TValue>> observableFactory, IObserver<TValue> observer)
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: base(observer)
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{
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_observableFactory = observableFactory;
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}
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public void Run()
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{
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IObservable<TValue> result;
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try
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{
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result = _observableFactory();
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}
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catch (Exception exception)
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{
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ForwardOnError(exception);
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return;
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}
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Run(result);
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}
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}
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}
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}
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