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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.Concurrency;
using System.Reactive.Disposables;
namespace System.Reactive.Linq.ObservableImpl
{
class Repeat<TResult> : Producer<TResult>
{
private readonly TResult _value;
private readonly int? _repeatCount;
private readonly IScheduler _scheduler;
public Repeat(TResult value, int? repeatCount, IScheduler scheduler)
{
_value = value;
_repeatCount = repeatCount;
_scheduler = scheduler;
}
protected override IDisposable Run(IObserver<TResult> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return sink.Run();
}
class _ : Sink<TResult>
{
private readonly Repeat<TResult> _parent;
public _(Repeat<TResult> parent, IObserver<TResult> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public IDisposable Run()
{
var longRunning = _parent._scheduler.AsLongRunning();
if (longRunning != null)
{
return Run(longRunning);
}
else
{
return Run(_parent._scheduler);
}
}
private IDisposable Run(IScheduler scheduler)
{
if (_parent._repeatCount == null)
{
return scheduler.Schedule(LoopRecInf);
}
else
{
return scheduler.Schedule(_parent._repeatCount.Value, LoopRec);
}
}
private void LoopRecInf(Action recurse)
{
base._observer.OnNext(_parent._value);
recurse();
}
private void LoopRec(int n, Action<int> recurse)
{
if (n > 0)
{
base._observer.OnNext(_parent._value);
n--;
}
if (n == 0)
{
base._observer.OnCompleted();
base.Dispose();
return;
}
recurse(n);
}
private IDisposable Run(ISchedulerLongRunning scheduler)
{
if (_parent._repeatCount == null)
{
return scheduler.ScheduleLongRunning(LoopInf);
}
else
{
return scheduler.ScheduleLongRunning(_parent._repeatCount.Value, Loop);
}
}
private void LoopInf(ICancelable cancel)
{
var value = _parent._value;
while (!cancel.IsDisposed)
base._observer.OnNext(value);
base.Dispose();
}
private void Loop(int n, ICancelable cancel)
{
var value = _parent._value;
while (n > 0 && !cancel.IsDisposed)
{
base._observer.OnNext(value);
n--;
}
if (!cancel.IsDisposed)
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
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