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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.Linq;
using System.Reactive.Disposables;
using System.Reactive.Subjects;
namespace System.Reactive.Linq.ObservableImpl
{
class GroupBy<TSource, TKey, TElement> : Producer<IGroupedObservable<TKey, TElement>>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, TKey> _keySelector;
private readonly Func<TSource, TElement> _elementSelector;
private readonly int? _capacity;
private readonly IEqualityComparer<TKey> _comparer;
public GroupBy(IObservable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector, int? capacity, IEqualityComparer<TKey> comparer)
{
_source = source;
_keySelector = keySelector;
_elementSelector = elementSelector;
_capacity = capacity;
_comparer = comparer;
}
private CompositeDisposable _groupDisposable;
private RefCountDisposable _refCountDisposable;
protected override IDisposable Run(IObserver<IGroupedObservable<TKey, TElement>> observer, IDisposable cancel, Action<IDisposable> setSink)
{
_groupDisposable = new CompositeDisposable();
_refCountDisposable = new RefCountDisposable(_groupDisposable);
var sink = new _(this, observer, cancel);
setSink(sink);
_groupDisposable.Add(_source.SubscribeSafe(sink));
return _refCountDisposable;
}
class _ : Sink<IGroupedObservable<TKey, TElement>>, IObserver<TSource>
{
private readonly GroupBy<TSource, TKey, TElement> _parent;
private readonly Dictionary<TKey, ISubject<TElement>> _map;
private ISubject<TElement> _null;
public _(GroupBy<TSource, TKey, TElement> parent, IObserver<IGroupedObservable<TKey, TElement>> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
if (_parent._capacity.HasValue)
{
_map = new Dictionary<TKey, ISubject<TElement>>(_parent._capacity.Value, _parent._comparer);
}
else
{
_map = new Dictionary<TKey, ISubject<TElement>>(_parent._comparer);
}
}
public void OnNext(TSource value)
{
var key = default(TKey);
try
{
key = _parent._keySelector(value);
}
catch (Exception exception)
{
Error(exception);
return;
}
var fireNewMapEntry = false;
var writer = default(ISubject<TElement>);
try
{
//
// Note: The box instruction in the IL will be erased by the JIT in case T is
// a value type. In fact, the whole if block will go away and we'll end
// up with nothing but the TryGetValue check below.
//
// // var fireNewMapEntry = false;
// C:\Projects\Rx\Rx\Experimental\Main\Source\Rx\System.Reactive.Linq\Reactive\Linq\Observable\GroupBy.cs @ 67:
// 000007fb`6d544b80 48c7452800000000 mov qword ptr [rbp+28h],0
//
// // var writer = default(ISubject<TElement>);
// C:\Projects\Rx\Rx\Experimental\Main\Source\Rx\System.Reactive.Linq\Reactive\Linq\Observable\GroupBy.cs @ 66:
// 000007fb`6d544b88 c6453400 mov byte ptr [rbp+34h],0
//
// // if (!_map.TryGetValue(key, out writer))
// C:\Projects\Rx\Rx\Experimental\Main\Source\Rx\System.Reactive.Linq\Reactive\Linq\Observable\GroupBy.cs @ 86:
// 000007fb`6d544b8c 488b4560 mov rax,qword ptr [rbp+60h]
// ...
//
if (key == null)
{
if (_null == null)
{
_null = new Subject<TElement>();
fireNewMapEntry = true;
}
writer = _null;
}
else
{
if (!_map.TryGetValue(key, out writer))
{
writer = new Subject<TElement>();
_map.Add(key, writer);
fireNewMapEntry = true;
}
}
}
catch (Exception exception)
{
Error(exception);
return;
}
if (fireNewMapEntry)
{
var group = new GroupedObservable<TKey, TElement>(key, writer, _parent._refCountDisposable);
_observer.OnNext(group);
}
var element = default(TElement);
try
{
element = _parent._elementSelector(value);
}
catch (Exception exception)
{
Error(exception);
return;
}
writer.OnNext(element);
}
public void OnError(Exception error)
{
Error(error);
}
public void OnCompleted()
{
if (_null != null)
_null.OnCompleted();
foreach (var w in _map.Values)
w.OnCompleted();
base._observer.OnCompleted();
base.Dispose();
}
private void Error(Exception exception)
{
if (_null != null)
_null.OnError(exception);
foreach (var w in _map.Values)
w.OnError(exception);
base._observer.OnError(exception);
base.Dispose();
}
}
}
}
#endif
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