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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#if HAS_AWAIT
using System.Threading;
using System.Reactive.Disposables;
using System.Reactive.Subjects;
namespace System.Reactive.Linq
{
internal partial class QueryLanguage
{
public virtual AsyncSubject<TSource> GetAwaiter<TSource>(IObservable<TSource> source)
{
var s = new AsyncSubject<TSource>();
source.SubscribeSafe(s);
return s;
}
public virtual AsyncSubject<TSource> GetAwaiter<TSource>(IConnectableObservable<TSource> source)
{
var s = new AsyncSubject<TSource>();
source.SubscribeSafe(s);
source.Connect();
return s;
}
public virtual AsyncSubject<TSource> RunAsync<TSource>(IObservable<TSource> source, CancellationToken cancellationToken)
{
var s = new AsyncSubject<TSource>();
var cancel = new Action(() => s.OnError(new OperationCanceledException()));
if (cancellationToken.IsCancellationRequested)
{
cancel();
return s;
}
var d = source.SubscribeSafe(s);
cancellationToken.Register(d.Dispose);
cancellationToken.Register(cancel);
return s;
}
public virtual AsyncSubject<TSource> RunAsync<TSource>(IConnectableObservable<TSource> source, CancellationToken cancellationToken)
{
var s = new AsyncSubject<TSource>();
var cancel = new Action(() => s.OnError(new OperationCanceledException()));
if (cancellationToken.IsCancellationRequested)
{
cancel();
return s;
}
var d = new CompositeDisposable(source.SubscribeSafe(s), source.Connect());
cancellationToken.Register(d.Dispose);
cancellationToken.Register(cancel);
return s;
}
}
}
#endif
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