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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
namespace System.ServiceModel.Dispatcher
{
using System;
using System.Diagnostics;
using System.ServiceModel.Channels;
using System.ServiceModel.Diagnostics;
using System.Collections.Generic;
using System.Threading;
using System.ServiceModel.Diagnostics.Application;
sealed class FlowThrottle
{
int capacity;
int count;
bool warningIssued;
int warningRestoreLimit;
object mutex;
WaitCallback release;
Queue<object> waiters;
String propertyName;
String configName;
Action acquired;
Action released;
Action<int> ratio;
internal FlowThrottle(WaitCallback release, int capacity, String propertyName, String configName)
{
if (capacity <= 0)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SFxThrottleLimitMustBeGreaterThanZero0)));
this.count = 0;
this.capacity = capacity;
this.mutex = new object();
this.release = release;
this.waiters = new Queue<object>();
this.propertyName = propertyName;
this.configName = configName;
this.warningRestoreLimit = (int)Math.Floor(0.7 * (double)capacity);
}
internal int Capacity
{
get { return this.capacity; }
set
{
if (value <= 0)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.SFxThrottleLimitMustBeGreaterThanZero0)));
this.capacity = value;
}
}
internal bool Acquire(object o)
{
bool acquiredThrottle = true;
lock (this.mutex)
{
if (this.count < this.capacity)
{
this.count++;
}
else
{
if (this.waiters.Count == 0)
{
if (TD.MessageThrottleExceededIsEnabled())
{
if (!this.warningIssued)
{
TD.MessageThrottleExceeded(this.propertyName, this.capacity);
this.warningIssued = true;
}
}
if (DiagnosticUtility.ShouldTraceWarning)
{
string traceMessage;
if (this.propertyName != null)
{
traceMessage = SR.GetString(SR.TraceCodeServiceThrottleLimitReached,
this.propertyName, this.capacity, this.configName);
}
else
{
traceMessage = SR.GetString(SR.TraceCodeServiceThrottleLimitReachedInternal,
this.capacity);
}
TraceUtility.TraceEvent(
TraceEventType.Warning, TraceCode.ServiceThrottleLimitReached, traceMessage);
}
}
this.waiters.Enqueue(o);
acquiredThrottle = false;
}
if (this.acquired != null)
{
this.acquired();
}
if (this.ratio != null)
{
this.ratio(this.count);
}
return acquiredThrottle;
}
}
internal void Release()
{
object next = null;
lock (this.mutex)
{
if (this.waiters.Count > 0)
{
next = this.waiters.Dequeue();
if (this.waiters.Count == 0)
this.waiters.TrimExcess();
}
else
{
this.count--;
if (this.count < this.warningRestoreLimit)
{
if (TD.MessageThrottleAtSeventyPercentIsEnabled() && this.warningIssued)
{
TD.MessageThrottleAtSeventyPercent(this.propertyName, this.capacity);
}
this.warningIssued = false;
}
}
}
if (next != null)
this.release(next);
if (this.released != null)
{
this.released();
}
if (this.ratio != null)
{
this.ratio(this.count);
}
}
internal void SetReleased(Action action)
{
this.released = action;
}
internal void SetAcquired(Action action)
{
this.acquired = action;
}
internal void SetRatio(Action<int> action)
{
this.ratio = action;
}
}
}
|
