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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.ObservableImpl
{
class Multicast<TSource, TIntermediate, TResult> : Producer<TResult>
{
private readonly IObservable<TSource> _source;
private readonly Func<ISubject<TSource, TIntermediate>> _subjectSelector;
private readonly Func<IObservable<TIntermediate>, IObservable<TResult>> _selector;
public Multicast(IObservable<TSource> source, Func<ISubject<TSource, TIntermediate>> subjectSelector, Func<IObservable<TIntermediate>, IObservable<TResult>> selector)
{
_source = source;
_subjectSelector = subjectSelector;
_selector = selector;
}
protected override IDisposable Run(IObserver<TResult> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return sink.Run();
}
class _ : Sink<TResult>, IObserver<TResult>
{
private readonly Multicast<TSource, TIntermediate, TResult> _parent;
public _(Multicast<TSource, TIntermediate, TResult> parent, IObserver<TResult> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public IDisposable Run()
{
var observable = default(IObservable<TResult>);
var connectable = default(IConnectableObservable<TIntermediate>);
try
{
var subject = _parent._subjectSelector();
connectable = new ConnectableObservable<TSource, TIntermediate>(_parent._source, subject);
observable = _parent._selector(connectable);
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return Disposable.Empty;
}
var subscription = observable.SubscribeSafe(this);
var connection = connectable.Connect();
return new CompositeDisposable(subscription, connection);
}
public void OnNext(TResult 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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