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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.Collections.Generic;
using System.Reactive.Concurrency;
using System.Reactive.Disposables;
namespace System.Reactive.Linq.ObservableImpl
{
class Catch<TSource> : Producer<TSource>
{
private readonly IEnumerable<IObservable<TSource>> _sources;
public Catch(IEnumerable<IObservable<TSource>> sources)
{
_sources = sources;
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(observer, cancel);
setSink(sink);
return sink.Run(_sources);
}
class _ : TailRecursiveSink<TSource>
{
public _(IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
}
protected override IEnumerable<IObservable<TSource>> Extract(IObservable<TSource> source)
{
var @catch = source as Catch<TSource>;
if (@catch != null)
return @catch._sources;
return null;
}
public override void OnNext(TSource value)
{
base._observer.OnNext(value);
}
private Exception _lastException;
public override void OnError(Exception error)
{
_lastException = error;
_recurse();
}
public override void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
protected override void Done()
{
if (_lastException != null)
base._observer.OnError(_lastException);
else
base._observer.OnCompleted();
base.Dispose();
}
}
}
class Catch<TSource, TException> : Producer<TSource> where TException : Exception
{
private readonly IObservable<TSource> _source;
private readonly Func<TException, IObservable<TSource>> _handler;
public Catch(IObservable<TSource> source, Func<TException, IObservable<TSource>> handler)
{
_source = source;
_handler = handler;
}
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 Catch<TSource, TException> _parent;
public _(Catch<TSource, TException> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
private SerialDisposable _subscription;
public IDisposable Run()
{
_subscription = new SerialDisposable();
var d1 = new SingleAssignmentDisposable();
_subscription.Disposable = d1;
d1.Disposable = _parent._source.SubscribeSafe(this);
return _subscription;
}
public void OnNext(TSource value)
{
base._observer.OnNext(value);
}
public void OnError(Exception error)
{
var e = error as TException;
if (e != null)
{
var result = default(IObservable<TSource>);
try
{
result = _parent._handler(e);
}
catch (Exception ex)
{
base._observer.OnError(ex);
base.Dispose();
return;
}
var d = new SingleAssignmentDisposable();
_subscription.Disposable = d;
d.Disposable = result.SubscribeSafe(new Impl(this));
}
else
{
base._observer.OnError(error);
base.Dispose();
}
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
class Impl : IObserver<TSource>
{
private readonly _ _parent;
public Impl(_ parent)
{
_parent = parent;
}
public void OnNext(TSource value)
{
_parent._observer.OnNext(value);
}
public void OnError(Exception error)
{
_parent._observer.OnError(error);
_parent.Dispose();
}
public void OnCompleted()
{
_parent._observer.OnCompleted();
_parent.Dispose();
}
}
}
}
}
#endif
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