1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
// 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;
namespace System.Reactive.Linq.ObservableImpl
{
class SkipLast<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly int _count;
private readonly TimeSpan _duration;
private readonly IScheduler _scheduler;
public SkipLast(IObservable<TSource> source, int count)
{
_source = source;
_count = count;
}
public SkipLast(IObservable<TSource> source, TimeSpan duration, IScheduler scheduler)
{
_source = source;
_duration = duration;
_scheduler = scheduler;
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
if (_scheduler == null)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
else
{
var sink = new SkipLastImpl(this, observer, cancel);
setSink(sink);
return sink.Run();
}
}
class _ : Sink<TSource>, IObserver<TSource>
{
private readonly SkipLast<TSource> _parent;
private Queue<TSource> _queue;
public _(SkipLast<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_queue = new Queue<TSource>();
}
public void OnNext(TSource value)
{
_queue.Enqueue(value);
if (_queue.Count > _parent._count)
base._observer.OnNext(_queue.Dequeue());
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
class SkipLastImpl : Sink<TSource>, IObserver<TSource>
{
private readonly SkipLast<TSource> _parent;
private Queue<System.Reactive.TimeInterval<TSource>> _queue;
public SkipLastImpl(SkipLast<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_queue = new Queue<System.Reactive.TimeInterval<TSource>>();
}
private IStopwatch _watch;
public IDisposable Run()
{
_watch = _parent._scheduler.StartStopwatch();
return _parent._source.SubscribeSafe(this);
}
public void OnNext(TSource value)
{
var now = _watch.Elapsed;
_queue.Enqueue(new System.Reactive.TimeInterval<TSource>(value, now));
while (_queue.Count > 0 && now - _queue.Peek().Interval >= _parent._duration)
base._observer.OnNext(_queue.Dequeue().Value);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
var now = _watch.Elapsed;
while (_queue.Count > 0 && now - _queue.Peek().Interval >= _parent._duration)
base._observer.OnNext(_queue.Dequeue().Value);
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
|
