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GroupJoin.cs
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GroupJoin.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Reactive.Disposables;
using System.Reactive.Subjects;
namespace System.Reactive.Linq.ObservableImpl
{
internal sealed class GroupJoin<TLeft, TRight, TLeftDuration, TRightDuration, TResult> : Producer<TResult, GroupJoin<TLeft, TRight, TLeftDuration, TRightDuration, TResult>._>
{
private readonly IObservable<TLeft> _left;
private readonly IObservable<TRight> _right;
private readonly Func<TLeft, IObservable<TLeftDuration>> _leftDurationSelector;
private readonly Func<TRight, IObservable<TRightDuration>> _rightDurationSelector;
private readonly Func<TLeft, IObservable<TRight>, TResult> _resultSelector;
public GroupJoin(IObservable<TLeft> left, IObservable<TRight> right, Func<TLeft, IObservable<TLeftDuration>> leftDurationSelector, Func<TRight, IObservable<TRightDuration>> rightDurationSelector, Func<TLeft, IObservable<TRight>, TResult> resultSelector)
{
_left = left;
_right = right;
_leftDurationSelector = leftDurationSelector;
_rightDurationSelector = rightDurationSelector;
_resultSelector = resultSelector;
}
protected override _ CreateSink(IObserver<TResult> observer) => new _(this, observer);
protected override void Run(_ sink) => sink.Run(this);
internal sealed class _ : IdentitySink<TResult>
{
private readonly object _gate = new object();
private readonly CompositeDisposable _group = new CompositeDisposable();
private readonly RefCountDisposable _refCount;
private readonly SortedDictionary<int, IObserver<TRight>> _leftMap;
private readonly SortedDictionary<int, TRight> _rightMap;
private readonly Func<TLeft, IObservable<TLeftDuration>> _leftDurationSelector;
private readonly Func<TRight, IObservable<TRightDuration>> _rightDurationSelector;
private readonly Func<TLeft, IObservable<TRight>, TResult> _resultSelector;
public _(GroupJoin<TLeft, TRight, TLeftDuration, TRightDuration, TResult> parent, IObserver<TResult> observer)
: base(observer)
{
_refCount = new RefCountDisposable(_group);
_leftMap = new SortedDictionary<int, IObserver<TRight>>();
_rightMap = new SortedDictionary<int, TRight>();
_leftDurationSelector = parent._leftDurationSelector;
_rightDurationSelector = parent._rightDurationSelector;
_resultSelector = parent._resultSelector;
}
private int _leftID;
private int _rightID;
public void Run(GroupJoin<TLeft, TRight, TLeftDuration, TRightDuration, TResult> parent)
{
var leftObserver = new LeftObserver(this);
_group.Add(leftObserver);
var rightObserver = new RightObserver(this);
_group.Add(rightObserver);
leftObserver.SetResource(parent._left.SubscribeSafe(leftObserver));
rightObserver.SetResource(parent._right.SubscribeSafe(rightObserver));
SetUpstream(_refCount);
}
private sealed class LeftObserver : SafeObserver<TLeft>
{
private readonly _ _parent;
public LeftObserver(_ parent)
{
_parent = parent;
}
private void Expire(int id, IObserver<TRight> group, IDisposable resource)
{
lock (_parent._gate)
{
if (_parent._leftMap.Remove(id))
{
group.OnCompleted();
}
}
_parent._group.Remove(resource);
}
public override void OnNext(TLeft value)
{
var s = new Subject<TRight>();
var id = 0;
var rightID = 0;
lock (_parent._gate)
{
id = _parent._leftID++;
rightID = _parent._rightID;
_parent._leftMap.Add(id, s);
}
var window = new WindowObservable<TRight>(s, _parent._refCount);
// BREAKING CHANGE v2 > v1.x - Order of evaluation or the _leftDurationSelector and _resultSelector now consistent with Join.
var duration = default(IObservable<TLeftDuration>);
try
{
duration = _parent._leftDurationSelector(value);
}
catch (Exception exception)
{
OnError(exception);
return;
}
var durationObserver = new DurationObserver(this, id, s);
_parent._group.Add(durationObserver);
// BREAKING CHANGE v2 > v1.x - The duration sequence is subscribed to before the result sequence is evaluated.
durationObserver.SetResource(duration.SubscribeSafe(durationObserver));
TResult result;
try
{
result = _parent._resultSelector(value, window);
}
catch (Exception exception)
{
OnError(exception);
return;
}
lock (_parent._gate)
{
_parent.ForwardOnNext(result);
foreach (var rightValue in _parent._rightMap)
{
if (rightValue.Key < rightID)
{
s.OnNext(rightValue.Value);
}
}
}
}
private sealed class DurationObserver : SafeObserver<TLeftDuration>
{
private readonly LeftObserver _parent;
private readonly int _id;
private readonly IObserver<TRight> _group;
public DurationObserver(LeftObserver parent, int id, IObserver<TRight> group)
{
_parent = parent;
_id = id;
_group = group;
}
public override void OnNext(TLeftDuration value)
{
_parent.Expire(_id, _group, this);
}
public override void OnError(Exception error)
{
_parent.OnError(error);
}
public override void OnCompleted()
{
_parent.Expire(_id, _group, this);
}
}
public override void OnError(Exception error)
{
lock (_parent._gate)
{
foreach (var o in _parent._leftMap)
{
o.Value.OnError(error);
}
_parent.ForwardOnError(error);
}
}
public override void OnCompleted()
{
lock (_parent._gate)
{
_parent.ForwardOnCompleted();
}
Dispose();
}
}
private sealed class RightObserver : SafeObserver<TRight>
{
private readonly _ _parent;
public RightObserver(_ parent)
{
_parent = parent;
}
private void Expire(int id, IDisposable resource)
{
lock (_parent._gate)
{
_parent._rightMap.Remove(id);
}
_parent._group.Remove(resource);
}
public override void OnNext(TRight value)
{
var id = 0;
var leftID = 0;
lock (_parent._gate)
{
id = _parent._rightID++;
leftID = _parent._leftID;
_parent._rightMap.Add(id, value);
}
var duration = default(IObservable<TRightDuration>);
try
{
duration = _parent._rightDurationSelector(value);
}
catch (Exception exception)
{
OnError(exception);
return;
}
var durationObserver = new DurationObserver(this, id);
_parent._group.Add(durationObserver);
durationObserver.SetResource(duration.SubscribeSafe(durationObserver));
lock (_parent._gate)
{
foreach (var o in _parent._leftMap)
{
if (o.Key < leftID)
{
o.Value.OnNext(value);
}
}
}
}
private sealed class DurationObserver : SafeObserver<TRightDuration>
{
private readonly RightObserver _parent;
private readonly int _id;
public DurationObserver(RightObserver parent, int id)
{
_parent = parent;
_id = id;
}
public override void OnNext(TRightDuration value)
{
_parent.Expire(_id, this);
}
public override void OnError(Exception error)
{
_parent.OnError(error);
}
public override void OnCompleted()
{
_parent.Expire(_id, this);
}
}
public override void OnError(Exception error)
{
lock (_parent._gate)
{
foreach (var o in _parent._leftMap)
{
o.Value.OnError(error);
}
_parent.ForwardOnError(error);
}
}
public override void OnCompleted()
{
Dispose();
}
}
}
}
}