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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.Disposables;
using System.Reactive.Subjects;
namespace System.Reactive.Linq.Observαble
{
class RefCount<TSource> : Producer<TSource>
{
private readonly IConnectableObservable<TSource> _source;
private readonly object _gate;
private int _count;
private IDisposable _connectableSubscription;
public RefCount(IConnectableObservable<TSource> source)
{
_source = source;
_gate = new object();
_count = 0;
_connectableSubscription = default(IDisposable);
}
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 RefCount<TSource> _parent;
public _(RefCount<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public IDisposable Run()
{
var subscription = _parent._source.SubscribeSafe(this);
lock (_parent._gate)
{
if (++_parent._count == 1)
{
_parent._connectableSubscription = _parent._source.Connect();
}
}
return Disposable.Create(() =>
{
subscription.Dispose();
lock (_parent._gate)
{
if (--_parent._count == 0)
{
_parent._connectableSubscription.Dispose();
}
}
});
}
public void OnNext(TSource value)
{
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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