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
|
// 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.Reactive.Concurrency;
using System.Reactive.Disposables;
using System.Threading;
namespace System.Reactive.Concurrency
{
class ObserveOn<TSource> : Producer<TSource>
{
private readonly IObservable<TSource> _source;
private readonly IScheduler _scheduler;
public ObserveOn(IObservable<TSource> source, IScheduler scheduler)
{
_source = source;
_scheduler = scheduler;
}
#if !NO_SYNCCTX
private readonly SynchronizationContext _context;
public ObserveOn(IObservable<TSource> source, SynchronizationContext context)
{
_source = source;
_context = context;
}
#endif
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "2", Justification = "Visibility restricted to friend assemblies. Those should be correct by inspection.")]
protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
{
#if !NO_SYNCCTX
if (_context != null)
{
var sink = new ς(this, observer, cancel);
setSink(sink);
return sink.Run();
}
else
#endif
{
var sink = new ObserveOnObserver<TSource>(_scheduler, observer, cancel);
setSink(sink);
return _source.SubscribeSafe(sink);
}
}
#if !NO_SYNCCTX
class ς : Sink<TSource>, IObserver<TSource>
{
private readonly ObserveOn<TSource> _parent;
public ς(ObserveOn<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
: base(observer, cancel)
{
_parent = parent;
}
public IDisposable Run()
{
//
// The interactions with OperationStarted/OperationCompleted below allow
// for test frameworks to wait until a whole sequence is observed, running
// asserts on a per-message level. Also, for ASP.NET pages, the use of the
// built-in synchronization context would allow processing to finished in
// its entirety before moving on with the page lifecycle.
//
_parent._context.OperationStarted();
var d = _parent._source.SubscribeSafe(this);
var c = Disposable.Create(() =>
{
_parent._context.OperationCompleted();
});
return new CompositeDisposable(d, c);
}
public void OnNext(TSource value)
{
_parent._context.Post(OnNextPosted, value);
}
public void OnError(Exception error)
{
_parent._context.Post(OnErrorPosted, error);
}
public void OnCompleted()
{
_parent._context.Post(OnCompletedPosted, null);
}
private void OnNextPosted(object value)
{
base._observer.OnNext((TSource)value);
}
private void OnErrorPosted(object error)
{
base._observer.OnError((Exception)error);
base.Dispose();
}
private void OnCompletedPosted(object ignored)
{
base._observer.OnCompleted();
base.Dispose();
}
}
#endif
}
}
#endif
|
