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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.Collections.Generic;
using System.Reactive.Concurrency;
using System.Reactive.Disposables;
namespace System.Reactive.Linq.Observαble
{
class TakeLast<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly int _count;
private readonly TimeSpan _duration;
private readonly IScheduler _scheduler;
private readonly IScheduler _loopScheduler;
public TakeLast(IObservable<TSource> source, int count, IScheduler loopScheduler)
{
_source = source;
_count = count;
_loopScheduler = loopScheduler;
}
public TakeLast(IObservable<TSource> source, TimeSpan duration, IScheduler scheduler, IScheduler loopScheduler)
{
_source = source;
_duration = duration;
_scheduler = scheduler;
_loopScheduler = loopScheduler;
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
if (_scheduler == null)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return sink.Run();
}
else
{
var sink = new τ(this, observer, cancel);
setSink(sink);
return sink.Run();
}
}
class _ : Sink<TSource>, IObserver<TSource>
{
private readonly TakeLast<TSource> _parent;
private Queue<TSource> _queue;
public _(TakeLast<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_queue = new Queue<TSource>();
}
private SingleAssignmentDisposable _subscription;
private SingleAssignmentDisposable _loop;
public IDisposable Run()
{
_subscription = new SingleAssignmentDisposable();
_loop = new SingleAssignmentDisposable();
_subscription.Disposable = _parent._source.SubscribeSafe(this);
return new CompositeDisposable(_subscription, _loop);
}
public void OnNext(TSource value)
{
_queue.Enqueue(value);
if (_queue.Count > _parent._count)
_queue.Dequeue();
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
_subscription.Dispose();
var longRunning = _parent._loopScheduler.AsLongRunning();
if (longRunning != null)
_loop.Disposable = longRunning.ScheduleLongRunning(Loop);
else
_loop.Disposable = _parent._loopScheduler.Schedule(LoopRec);
}
private void LoopRec(Action recurse)
{
if (_queue.Count > 0)
{
base._observer.OnNext(_queue.Dequeue());
recurse();
}
else
{
base._observer.OnCompleted();
base.Dispose();
}
}
private void Loop(ICancelable cancel)
{
var n = _queue.Count;
while (!cancel.IsDisposed)
{
if (n == 0)
{
base._observer.OnCompleted();
break;
}
else
base._observer.OnNext(_queue.Dequeue());
n--;
}
base.Dispose();
}
}
class τ : Sink<TSource>, IObserver<TSource>
{
private readonly TakeLast<TSource> _parent;
private Queue<System.Reactive.TimeInterval<TSource>> _queue;
public τ(TakeLast<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_queue = new Queue<System.Reactive.TimeInterval<TSource>>();
}
private SingleAssignmentDisposable _subscription;
private SingleAssignmentDisposable _loop;
private IStopwatch _watch;
public IDisposable Run()
{
_subscription = new SingleAssignmentDisposable();
_loop = new SingleAssignmentDisposable();
_watch = _parent._scheduler.StartStopwatch();
_subscription.Disposable = _parent._source.SubscribeSafe(this);
return new CompositeDisposable(_subscription, _loop);
}
public void OnNext(TSource value)
{
var now = _watch.Elapsed;
_queue.Enqueue(new System.Reactive.TimeInterval<TSource>(value, now));
Trim(now);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
_subscription.Dispose();
var now = _watch.Elapsed;
Trim(now);
var longRunning = _parent._loopScheduler.AsLongRunning();
if (longRunning != null)
_loop.Disposable = longRunning.ScheduleLongRunning(Loop);
else
_loop.Disposable = _parent._loopScheduler.Schedule(LoopRec);
}
private void LoopRec(Action recurse)
{
if (_queue.Count > 0)
{
base._observer.OnNext(_queue.Dequeue().Value);
recurse();
}
else
{
base._observer.OnCompleted();
base.Dispose();
}
}
private void Loop(ICancelable cancel)
{
var n = _queue.Count;
while (!cancel.IsDisposed)
{
if (n == 0)
{
base._observer.OnCompleted();
break;
}
else
base._observer.OnNext(_queue.Dequeue().Value);
n--;
}
base.Dispose();
}
private void Trim(TimeSpan now)
{
while (_queue.Count > 0 && now - _queue.Peek().Interval >= _parent._duration)
_queue.Dequeue();
}
}
}
}
#endif
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