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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;
using System.Threading;
namespace System.Reactive.Linq.Observαble
{
class SkipUntil<TSource, TOther> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly IObservable<TOther> _other;
public SkipUntil(IObservable<TSource> source, IObservable<TOther> other)
{
_source = source;
_other = other;
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return sink.Run();
}
class _ : Sink<TSource>
{
private readonly SkipUntil<TSource, TOther> _parent;
public _(SkipUntil<TSource, TOther> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public IDisposable Run()
{
var sourceObserver = new T(this);
var otherObserver = new O(this, sourceObserver);
var sourceSubscription = _parent._source.SubscribeSafe(sourceObserver);
var otherSubscription = _parent._other.SubscribeSafe(otherObserver);
sourceObserver.Disposable = sourceSubscription;
otherObserver.Disposable = otherSubscription;
return new CompositeDisposable(
sourceSubscription,
otherSubscription
);
}
class T : IObserver<TSource>
{
private readonly _ _parent;
public volatile IObserver<TSource> _observer;
private readonly SingleAssignmentDisposable _subscription;
public T(_ parent)
{
_parent = parent;
_observer = NopObserver<TSource>.Instance;
_subscription = new SingleAssignmentDisposable();
}
public IDisposable Disposable
{
set { _subscription.Disposable = value; }
}
public void OnNext(TSource value)
{
_observer.OnNext(value);
}
public void OnError(Exception error)
{
_parent._observer.OnError(error);
_parent.Dispose();
}
public void OnCompleted()
{
_observer.OnCompleted();
_subscription.Dispose(); // We can't cancel the other stream yet, it may be on its way to dispatch an OnError message and we don't want to have a race.
}
}
class O : IObserver<TOther>
{
private readonly _ _parent;
private readonly T _sourceObserver;
private readonly SingleAssignmentDisposable _subscription;
public O(_ parent, T sourceObserver)
{
_parent = parent;
_sourceObserver = sourceObserver;
_subscription = new SingleAssignmentDisposable();
}
public IDisposable Disposable
{
set { _subscription.Disposable = value; }
}
public void OnNext(TOther value)
{
_sourceObserver._observer = _parent._observer;
_subscription.Dispose();
}
public void OnError(Exception error)
{
_parent._observer.OnError(error);
_parent.Dispose();
}
public void OnCompleted()
{
_subscription.Dispose();
}
}
}
}
class SkipUntil<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly DateTimeOffset _startTime;
internal readonly IScheduler _scheduler;
public SkipUntil(IObservable<TSource> source, DateTimeOffset startTime, IScheduler scheduler)
{
_source = source;
_startTime = startTime;
_scheduler = scheduler;
}
public IObservable<TSource> Ω(DateTimeOffset startTime)
{
//
// 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.SU(5AM) xxxxxxxxxxxxxxxx-o--| xs.SU(3AM) xxxxxxxxxx-o--o--o--|
// xs.SU(5AM).SU(3AM) xxxxxxxxx--------o--| xs.SU(3AM).SU(5AM) xxxxxxxxxxxxxxxx-o--|
//
if (startTime <= _startTime)
return this;
else
return new SkipUntil<TSource>(_source, startTime, _scheduler);
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return sink.Run();
}
class _ : Sink<TSource>, IObserver<TSource>
{
private readonly SkipUntil<TSource> _parent;
private volatile bool _open;
public _(SkipUntil<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public IDisposable Run()
{
var t = _parent._scheduler.Schedule(_parent._startTime, 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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