public static IObservable <Unit> ForEachAsync <T>(this IAsyncStreamReader <T> stream, Action <T> action)
{
return(Observable.CreateWithState <Unit, Tuple <IAsyncStreamReader <T>, Action <T> > >(Tuple.Create(stream, action), (state0, observer) =>
{
var disp = new MultipleAssignmentDisposable();
var worker = new AsyncStreamReaderForEachAsync_ <T>(disp, state0.Item1, state0.Item2, observer);
worker.ConsumeNext();
return disp;
}));
}
/// <summary>
/// 指定されたファイルを読み込む
/// 読み込み処理は同期的に実行するためキャンセルはできない
/// </summary>
private IObservable <string> ReadFile(string path)
{
return(Observable.CreateWithState <string, string>(path, (p, observer) =>
{
using (var r = new StreamReader(p))
{
observer.OnNext(r.ReadToEnd());
}
observer.OnCompleted();
return Disposable.Empty;
}));
}
private IObservable <int> CreateCountObservable(int count)
{
if (count <= 0)
{
return(Observable.Empty <int>());
}
return(Observable.CreateWithState <int, int>(state: count, subscribe: (max, observer) =>
{
for (var i = 0; i < max; i++)
{
observer.OnNext(max);
}
observer.OnCompleted();
return Disposable.Empty;
}));
}
public static IObservable <T> AsObservable <T>(this IAsyncStreamReader <T> stream, bool observeOnMainThread = true, IDisposable streamingResult = null)
{
var seq = Observable.CreateWithState <T, Tuple <IAsyncStreamReader <T>, IDisposable> >(Tuple.Create(stream, streamingResult), (state, observer) =>
{
var disp = new MultipleAssignmentDisposable();
var b = new AsyncStreamReaderAsObservable_ <T>(disp, state.Item1, observer, state.Item2);
b.ConsumeNext();
if (state.Item2 == null)
{
return(disp);
}
else
{
return(StableCompositeDisposable.Create(disp, state.Item2));
}
});
return((observeOnMainThread) ? seq.ObserveOnMainThread() : seq);
}
/// <summary>
/// 指定個数、連続した値を発行する（Rangeと同じ挙動）Observableを作って返す
/// </summary>
/// <param name="count">発行個数</param>
/// <returns></returns>
IObservable <int> CreateCountObservable(int count)
{
// countが０以下の場合はOnCompletedメッセージのみを返す
if (count <= 0)
{
return(Observable.Empty <int>());
}
// 指定した数だけ連続する値を発行する
return(Observable.CreateWithState <int, int>(
state: count,
subscribe: (maxCount, observer) =>
{
// 第一引数にstateで指定した値（この場合はcount）が渡される
// つまり maxCount = count
for (int i = 0; i < maxCount; i++)
{
observer.OnNext(maxCount);
}
observer.OnCompleted();
return Disposable.Empty;
}));
}
