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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#if !NO_PERF
using System;
using System.Reactive.Disposables;
namespace System.Reactive.Linq.ObservableImpl
{
class Defer<TValue> : Producer<TValue>, IEvaluatableObservable<TValue>
{
private readonly Func<IObservable<TValue>> _observableFactory;
public Defer(Func<IObservable<TValue>> observableFactory)
{
_observableFactory = observableFactory;
}
protected override IDisposable Run(IObserver<TValue> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return sink.Run();
}
public IObservable<TValue> Eval()
{
return _observableFactory();
}
class _ : Sink<TValue>, IObserver<TValue>
{
private readonly Defer<TValue> _parent;
public _(Defer<TValue> parent, IObserver<TValue> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public IDisposable Run()
{
var result = default(IObservable<TValue>);
try
{
result = _parent.Eval();
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return Disposable.Empty;
}
return result.SubscribeSafe(this);
}
public void OnNext(TValue value)
{
base._observer.OnNext(value);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
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