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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Reactive.Concurrency;
using System.Reactive.Disposables;
namespace System.Reactive.Linq
{
#if !NO_PERF
using ObservableImpl;
#endif
internal partial class QueryLanguage
{
#region + Subscribe +
public virtual IDisposable Subscribe<TSource>(IEnumerable<TSource> source, IObserver<TSource> observer)
{
return Subscribe_<TSource>(source, observer, SchedulerDefaults.Iteration);
}
public virtual IDisposable Subscribe<TSource>(IEnumerable<TSource> source, IObserver<TSource> observer, IScheduler scheduler)
{
return Subscribe_<TSource>(source, observer, scheduler);
}
private static IDisposable Subscribe_<TSource>(IEnumerable<TSource> source, IObserver<TSource> observer, IScheduler scheduler)
{
#if !NO_PERF
//
// [OK] Use of unsafe Subscribe: we're calling into a known producer implementation.
//
return new ToObservable<TSource>(source, scheduler).Subscribe/*Unsafe*/(observer);
#else
var e = source.GetEnumerator();
var flag = new BooleanDisposable();
scheduler.Schedule(self =>
{
var hasNext = false;
var ex = default(Exception);
var current = default(TSource);
if (flag.IsDisposed)
{
e.Dispose();
return;
}
try
{
hasNext = e.MoveNext();
if (hasNext)
current = e.Current;
}
catch (Exception exception)
{
ex = exception;
}
if (!hasNext || ex != null)
{
e.Dispose();
}
if (ex != null)
{
observer.OnError(ex);
return;
}
if (!hasNext)
{
observer.OnCompleted();
return;
}
observer.OnNext(current);
self();
});
return flag;
#endif
}
#endregion
#region + ToEnumerable +
public virtual IEnumerable<TSource> ToEnumerable<TSource>(IObservable<TSource> source)
{
return new AnonymousEnumerable<TSource>(() => source.GetEnumerator());
}
#endregion
#region ToEvent
public virtual IEventSource<Unit> ToEvent(IObservable<Unit> source)
{
return new EventSource<Unit>(source, (h, _) => h(Unit.Default));
}
public virtual IEventSource<TSource> ToEvent<TSource>(IObservable<TSource> source)
{
return new EventSource<TSource>(source, (h, value) => h(value));
}
#endregion
#region ToEventPattern
public virtual IEventPatternSource<TEventArgs> ToEventPattern<TEventArgs>(IObservable<EventPattern<TEventArgs>> source)
#if !NO_EVENTARGS_CONSTRAINT
where TEventArgs : EventArgs
#endif
{
return new EventPatternSource<TEventArgs>(
#if !NO_VARIANCE
source,
#else
source.Select(x => (EventPattern<object, TEventArgs>)x),
#endif
(h, evt) => h(evt.Sender, evt.EventArgs)
);
}
#endregion
#region + ToObservable +
public virtual IObservable<TSource> ToObservable<TSource>(IEnumerable<TSource> source)
{
#if !NO_PERF
return new ToObservable<TSource>(source, SchedulerDefaults.Iteration);
#else
return ToObservable_(source, SchedulerDefaults.Iteration);
#endif
}
public virtual IObservable<TSource> ToObservable<TSource>(IEnumerable<TSource> source, IScheduler scheduler)
{
#if !NO_PERF
return new ToObservable<TSource>(source, scheduler);
#else
return ToObservable_(source, scheduler);
#endif
}
#if NO_PERF
private static IObservable<TSource> ToObservable_<TSource>(IEnumerable<TSource> source, IScheduler scheduler)
{
return new AnonymousObservable<TSource>(observer => source.Subscribe(observer, scheduler));
}
#endif
#endregion
}
}
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