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
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#if !NO_PERF
using System;
namespace System.Reactive.Linq.ObservableImpl
{
class Scan<TSource, TAccumulate> : Producer<TAccumulate>
{
private readonly IObservable<TSource> _source;
private readonly TAccumulate _seed;
private readonly Func<TAccumulate, TSource, TAccumulate> _accumulator;
public Scan(IObservable<TSource> source, TAccumulate seed, Func<TAccumulate, TSource, TAccumulate> accumulator)
{
_source = source;
_seed = seed;
_accumulator = accumulator;
}
protected override IDisposable Run(IObserver<TAccumulate> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
class _ : Sink<TAccumulate>, IObserver<TSource>
{
private readonly Scan<TSource, TAccumulate> _parent;
private TAccumulate _accumulation;
private bool _hasAccumulation;
public _(Scan<TSource, TAccumulate> parent, IObserver<TAccumulate> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_accumulation = default(TAccumulate);
_hasAccumulation = false;
}
public void OnNext(TSource value)
{
try
{
if (_hasAccumulation)
_accumulation = _parent._accumulator(_accumulation, value);
else
{
_accumulation = _parent._accumulator(_parent._seed, value);
_hasAccumulation = true;
}
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return;
}
base._observer.OnNext(_accumulation);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
class Scan<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly Func<TSource, TSource, TSource> _accumulator;
public Scan(IObservable<TSource> source, Func<TSource, TSource, TSource> accumulator)
{
_source = source;
_accumulator = accumulator;
}
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
var sink = new _(this, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
class _ : Sink<TSource>, IObserver<TSource>
{
private readonly Scan<TSource> _parent;
private TSource _accumulation;
private bool _hasAccumulation;
public _(Scan<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
_accumulation = default(TSource);
_hasAccumulation = false;
}
public void OnNext(TSource value)
{
try
{
if (_hasAccumulation)
_accumulation = _parent._accumulator(_accumulation, value);
else
{
_accumulation = value;
_hasAccumulation = true;
}
}
catch (Exception exception)
{
base._observer.OnError(exception);
base.Dispose();
return;
}
base._observer.OnNext(_accumulation);
}
public void OnError(Exception error)
{
base._observer.OnError(error);
base.Dispose();
}
public void OnCompleted()
{
base._observer.OnCompleted();
base.Dispose();
}
}
}
}
#endif
|
