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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 Skip<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly int _count;
private readonly TimeSpan _duration;
internal readonly IScheduler _scheduler;
public Skip(IObservable<TSource> source, int count)
{
_source = source;
_count = count;
}
public Skip(IObservable<TSource> source, TimeSpan duration, IScheduler scheduler)
{
_source = source;
_duration = duration;
_scheduler = scheduler;
}
public IObservable<TSource> Omega(int count)
{
//
// Sum semantics:
//
// xs --o--o--o--o--o--o--| xs --o--o--o--o--o--o--|
// xs.Skip(2) --x--x--o--o--o--o--| xs.Skip(3) --x--x--x--o--o--o--|
// xs.Skip(2).Skip(3) --------x--x--x--o--| xs.Skip(3).Skip(2) -----------x--x--o--|
//
return new Skip<TSource>(_source, _count + count);
}
public IObservable<TSource> Omega(TimeSpan duration)
{
//
// Maximum semantics:
//
// t 0--1--2--3--4--5--6--7-> t 0--1--2--3--4--5--6--7->
//
// xs --o--o--o--o--o--o--| xs --o--o--o--o--o--o--|
// xs.Skip(2s) xxxxxxx-o--o--o--o--| xs.Skip(3s) xxxxxxxxxx-o--o--o--|
// xs.Skip(2s).Skip(3s) xxxxxxxxxx-o--o--o--| xs.Skip(3s).Skip(2s) xxxxxxx----o--o--o--|
//
if (duration <= _duration)
return this;
else
return new Skip<TSource>(_source, duration, _scheduler);
}
protected override IDisposable Run(IObserver<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 SkipImpl(this, observer, cancel);
setSink(sink);
return sink.Run();
}
}
class _ : Sink<TSource>, IObserver<TSource>
{
private readonly Skip<TSource> _parent;
private int _remaining;
public _(Skip<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_remaining = _parent._count;
}
public void OnNext(TSource value)
{
if (_remaining <= 0)
base._observer.OnNext(value);
else
_remaining--;
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
class SkipImpl : Sink<TSource>, IObserver<TSource>
{
private readonly Skip<TSource> _parent;
private volatile bool _open;
public SkipImpl(Skip<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public IDisposable Run()
{
var t = _parent._scheduler.Schedule(_parent._duration, Tick);
var d = _parent._source.SubscribeSafe(this);
return new CompositeDisposable(t, d);
}
private void Tick()
{
_open = true;
}
public void OnNext(TSource value)
{
if (_open)
base._observer.OnNext(value);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
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