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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 Sample<TSource, TSample> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly IObservable<TSample> _sampler;
public Sample(IObservable<TSource> source, IObservable<TSample> sampler)
{
_source = source;
_sampler = sampler;
}
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 Sample<TSource, TSample> _parent;
public _(Sample<TSource, TSample> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
private object _gate;
private IDisposable _sourceSubscription;
private bool _hasValue;
private TSource _value;
private bool _atEnd;
public IDisposable Run()
{
_gate = new object();
var sourceSubscription = new SingleAssignmentDisposable();
_sourceSubscription = sourceSubscription;
sourceSubscription.Disposable = _parent._source.SubscribeSafe(this);
var samplerSubscription = _parent._sampler.SubscribeSafe(new SampleImpl(this));
return new CompositeDisposable(_sourceSubscription, samplerSubscription);
}
public void OnNext(TSource value)
{
lock (_gate)
{
_hasValue = true;
_value = value;
}
}
public void OnError(Exception error)
{
lock (_gate)
{
base._observer.OnError(error);
base.Dispose();
}
}
public void OnCompleted()
{
lock (_gate)
{
_atEnd = true;
_sourceSubscription.Dispose();
}
}
class SampleImpl : IObserver<TSample>
{
private readonly _ _parent;
public SampleImpl(_ parent)
{
_parent = parent;
}
public void OnNext(TSample value)
{
lock (_parent._gate)
{
if (_parent._hasValue)
{
_parent._hasValue = false;
_parent._observer.OnNext(_parent._value);
}
if (_parent._atEnd)
{
_parent._observer.OnCompleted();
_parent.Dispose();
}
}
}
public void OnError(Exception error)
{
// BREAKING CHANGE v2 > v1.x - This error used to be swallowed
lock (_parent._gate)
{
_parent._observer.OnError(error);
_parent.Dispose();
}
}
public void OnCompleted()
{
lock (_parent._gate)
{
if (_parent._hasValue)
{
_parent._hasValue = false;
_parent._observer.OnNext(_parent._value);
}
if (_parent._atEnd)
{
_parent._observer.OnCompleted();
_parent.Dispose();
}
}
}
}
}
}
class Sample<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly TimeSpan _interval;
private readonly IScheduler _scheduler;
public Sample(IObservable<TSource> source, TimeSpan interval, IScheduler scheduler)
{
_source = source;
_interval = interval;
_scheduler = 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 Sample<TSource> _parent;
public _(Sample<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
private object _gate;
private IDisposable _sourceSubscription;
private bool _hasValue;
private TSource _value;
private bool _atEnd;
public IDisposable Run()
{
_gate = new object();
var sourceSubscription = new SingleAssignmentDisposable();
_sourceSubscription = sourceSubscription;
sourceSubscription.Disposable = _parent._source.SubscribeSafe(this);
return new CompositeDisposable(
sourceSubscription,
_parent._scheduler.SchedulePeriodic(_parent._interval, Tick)
);
}
private void Tick()
{
lock (_gate)
{
if (_hasValue)
{
_hasValue = false;
base._observer.OnNext(_value);
}
if (_atEnd)
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
public void OnNext(TSource value)
{
lock (_gate)
{
_hasValue = true;
_value = value;
}
}
public void OnError(Exception error)
{
lock (_gate)
{
base._observer.OnError(error);
base.Dispose();
}
}
public void OnCompleted()
{
lock (_gate)
{
_atEnd = true;
_sourceSubscription.Dispose();
}
}
}
}
}
#endif
|
