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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_WINRT
using System.Reactive.Disposables;
using System.Reactive.Linq;
using System.Reactive.Subjects;
using System.Reactive.Threading.Tasks;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Threading.Tasks;
using Windows.Foundation;
namespace System.Reactive.Linq
{
/// <summary>
/// Provides a set of extension methods to expose observable sequences as Windows Runtime asynchronous actions and operations.
/// </summary>
public static class AsyncInfoObservable
{
#region IAsyncAction
/// <summary>
/// Creates a Windows Runtime asynchronous action that represents the completion of the observable sequence.
/// Upon cancellation of the asynchronous action, the subscription to the source sequence will be disposed.
/// </summary>
/// <typeparam name="TSource">The type of the elements in the source sequence.</typeparam>
/// <param name="source">Source sequence to expose as an asynchronous action.</param>
/// <returns>Windows Runtime asynchronous action object representing the completion of the observable sequence.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
public static IAsyncAction ToAsyncAction<TSource>(this IObservable<TSource> source)
{
if (source == null)
throw new ArgumentNullException("source");
return AsyncInfo.Run(ct => (Task)source.DefaultIfEmpty().ToTask(ct));
}
#region Progress
/// <summary>
/// Creates a Windows Runtime asynchronous action that represents the completion of the observable sequence, reporting incremental progress for each element produced by the sequence.
/// Upon cancellation of the asynchronous action, the subscription to the source sequence will be disposed.
/// </summary>
/// <typeparam name="TSource">The type of the elements in the source sequence.</typeparam>
/// <param name="source">Source sequence to expose as an asynchronous action.</param>
/// <returns>Windows Runtime asynchronous action object representing the completion of the observable sequence, reporting incremental progress for each source sequence element.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
public static IAsyncActionWithProgress<int> ToAsyncActionWithProgress<TSource>(this IObservable<TSource> source)
{
if (source == null)
throw new ArgumentNullException("source");
return AsyncInfo.Run<int>((ct, progress) =>
{
var i = 0;
return (Task)source.Do(_ => progress.Report(i++)).DefaultIfEmpty().ToTask(ct);
});
}
/// <summary>
/// Creates a Windows Runtime asynchronous action that represents the completion of the observable sequence, using a selector function to map the source sequence on a progress reporting sequence.
/// Upon cancellation of the asynchronous action, the subscription to the source sequence will be disposed.
/// </summary>
/// <typeparam name="TSource">The type of the elements in the source sequence.</typeparam>
/// <typeparam name="TProgress">The type of the elements in the progress sequence.</typeparam>
/// <param name="source">Source sequence to expose as an asynchronous action and to compute a progress sequence that gets reported through the asynchronous action.</param>
/// <param name="progressSelector">Selector function to map the source sequence on a progress reporting sequence.</param>
/// <returns>Windows Runtime asynchronous action object representing the completion of the result sequence, reporting progress computed through the progress sequence.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> or <paramref name="progressSelector"/> is null.</exception>
public static IAsyncActionWithProgress<TProgress> ToAsyncActionWithProgress<TSource, TProgress>(this IObservable<TSource> source, Func<IObservable<TSource>, IObservable<TProgress>> progressSelector)
{
if (source == null)
throw new ArgumentNullException("source");
if (progressSelector == null)
throw new ArgumentNullException("progressSelector");
return AsyncInfo.Run<TProgress>((ct, progress) =>
{
return (Task)Observable.Create<TSource>(observer =>
{
var obs = Observer.Synchronize(observer);
var data = source.Publish();
var progressSubscription = progressSelector(data).Subscribe(progress.Report, obs.OnError);
var dataSubscription = data.DefaultIfEmpty().Subscribe(obs);
var connection = data.Connect();
return new CompositeDisposable(progressSubscription, dataSubscription, connection);
}).ToTask(ct);
});
}
#endregion
#endregion
#region IAsyncOperation<T>
/// <summary>
/// Creates a Windows Runtime asynchronous operation that returns the last element of the observable sequence.
/// Upon cancellation of the asynchronous operation, the subscription to the source sequence will be disposed.
/// </summary>
/// <typeparam name="TSource">The type of the elements in the source sequence.</typeparam>
/// <param name="source">Source sequence to expose as an asynchronous operation.</param>
/// <returns>Windows Runtime asynchronous operation object that returns the last element of the observable sequence.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
public static IAsyncOperation<TSource> ToAsyncOperation<TSource>(this IObservable<TSource> source)
{
if (source == null)
throw new ArgumentNullException("source");
return AsyncInfo.Run(ct => source.ToTask(ct));
}
/// <summary>
/// Creates a Windows Runtime asynchronous operation that returns the last element of the observable sequence, reporting incremental progress for each element produced by the sequence.
/// Upon cancellation of the asynchronous operation, the subscription to the source sequence will be disposed.
/// </summary>
/// <typeparam name="TSource">The type of the elements in the source sequence.</typeparam>
/// <param name="source">Source sequence to expose as an asynchronous operation.</param>
/// <returns>Windows Runtime asynchronous operation object that returns the last element of the observable sequence, reporting incremental progress for each source sequence element.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
public static IAsyncOperationWithProgress<TSource, int> ToAsyncOperationWithProgress<TSource>(this IObservable<TSource> source)
{
if (source == null)
throw new ArgumentNullException("source");
return AsyncInfo.Run<TSource, int>((ct, progress) =>
{
var i = 0;
return source.Do(_ => progress.Report(i++)).ToTask(ct);
});
}
#region Progress
/// <summary>
/// Creates a Windows Runtime asynchronous operation that returns the last element of the result sequence, reporting incremental progress for each element produced by the source sequence.
/// Upon cancellation of the asynchronous operation, the subscription to the source sequence will be disposed.
/// </summary>
/// <typeparam name="TSource">The type of the elements in the source sequence.</typeparam>
/// <typeparam name="TResult">The type of the elements in the result sequence.</typeparam>
/// <param name="source">Source sequence to compute a result sequence that gets exposed as an asynchronous operation.</param>
/// <param name="resultSelector">Selector function to map the source sequence on a result sequence.</param>
/// <returns>Windows Runtime asynchronous operation object that returns the last element of the result sequence, reporting incremental progress for each source sequence element.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> or <paramref name="resultSelector"/> is null.</exception>
public static IAsyncOperationWithProgress<TResult, int> ToAsyncOperationWithProgress<TSource, TResult>(this IObservable<TSource> source, Func<IObservable<TSource>, IObservable<TResult>> resultSelector)
{
if (source == null)
throw new ArgumentNullException("source");
if (resultSelector == null)
throw new ArgumentNullException("resultSelector");
return AsyncInfo.Run<TResult, int>((ct, progress) =>
{
var i = 0;
return resultSelector(source.Do(_ => progress.Report(i++))).ToTask(ct);
});
}
/// <summary>
/// Creates a Windows Runtime asynchronous operation that returns the last element of the result sequence, using a selector function to map the source sequence on a progress reporting sequence.
/// Upon cancellation of the asynchronous operation, the subscription to the source sequence will be disposed.
/// </summary>
/// <typeparam name="TSource">The type of the elements in the source sequence.</typeparam>
/// <typeparam name="TResult">The type of the elements in the result sequence.</typeparam>
/// <typeparam name="TProgress">The type of the elements in the progress sequence.</typeparam>
/// <param name="source">Source sequence to compute a result sequence that gets exposed as an asynchronous operation and a progress sequence that gets reported through the asynchronous operation.</param>
/// <param name="resultSelector">Selector function to map the source sequence on a result sequence.</param>
/// <param name="progressSelector">Selector function to map the source sequence on a progress reporting sequence.</param>
/// <returns>Windows Runtime asynchronous operation object that returns the last element of the result sequence, reporting progress computed through the progress sequence.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source"/> or <paramref name="resultSelector"/> or <paramref name="progressSelector"/> is null.</exception>
public static IAsyncOperationWithProgress<TResult, TProgress> ToAsyncOperationWithProgress<TSource, TResult, TProgress>(this IObservable<TSource> source, Func<IObservable<TSource>, IObservable<TResult>> resultSelector, Func<IObservable<TSource>, IObservable<TProgress>> progressSelector)
{
if (source == null)
throw new ArgumentNullException("source");
if (resultSelector == null)
throw new ArgumentNullException("resultSelector");
if (progressSelector == null)
throw new ArgumentNullException("progressSelector");
return AsyncInfo.Run<TResult, TProgress>((ct, progress) =>
{
return Observable.Create<TResult>(observer =>
{
var obs = Observer.Synchronize(observer);
var data = source.Publish();
var progressSubscription = progressSelector(data).Subscribe(progress.Report, obs.OnError);
var dataSubscription = resultSelector(data).Subscribe(obs);
var connection = data.Connect();
return new CompositeDisposable(progressSubscription, dataSubscription, connection);
}).ToTask(ct);
});
}
#endregion
#endregion
}
}
#endif
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