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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.Linq;
using System.Reactive.Concurrency;
using System.Reactive.Disposables;
namespace System.Reactive.Linq.ObservableImpl
{
class TakeLastBuffer<TSource> : Producer<IList<TSource>>
{
private readonly IObservable<TSource> _source;
private readonly int _count;
private readonly TimeSpan _duration;
private readonly IScheduler _scheduler;
public TakeLastBuffer(IObservable<TSource> source, int count)
{
_source = source;
_count = count;
}
public TakeLastBuffer(IObservable<TSource> source, TimeSpan duration, IScheduler scheduler)
{
_source = source;
_duration = duration;
_scheduler = scheduler;
}
protected override IDisposable Run(IObserver<IList<TSource>> observer, IDisposable cancel, Action<IDisposable> setSink)
{
if (_scheduler == null)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
else
{
var sink = new Impl(this, observer, cancel);
setSink(sink);
return sink.Run();
}
}
class _ : Sink<IList<TSource>>, IObserver<TSource>
{
private readonly TakeLastBuffer<TSource> _parent;
private Queue<TSource> _queue;
public _(TakeLastBuffer<TSource> parent, IObserver<IList<TSource>> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_queue = new Queue<TSource>();
}
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()
{
var res = new List<TSource>(_queue.Count);
while (_queue.Count > 0)
res.Add(_queue.Dequeue());
base._observer.OnNext(res);
base._observer.OnCompleted();
base.Dispose();
}
}
class Impl : Sink<IList<TSource>>, IObserver<TSource>
{
private readonly TakeLastBuffer<TSource> _parent;
private Queue<System.Reactive.TimeInterval<TSource>> _queue;
public Impl(TakeLastBuffer<TSource> parent, IObserver<IList<TSource>> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_queue = new Queue<System.Reactive.TimeInterval<TSource>>();
}
private IStopwatch _watch;
public IDisposable Run()
{
_watch = _parent._scheduler.StartStopwatch();
return _parent._source.SubscribeSafe(this);
}
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()
{
var now = _watch.Elapsed;
Trim(now);
var res = new List<TSource>(_queue.Count);
while (_queue.Count > 0)
res.Add(_queue.Dequeue().Value);
base._observer.OnNext(res);
base._observer.OnCompleted();
base.Dispose();
}
private void Trim(TimeSpan now)
{
while (_queue.Count > 0 && now - _queue.Peek().Interval >= _parent._duration)
_queue.Dequeue();
}
}
}
}
#endif
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