annotate Implab/Diagnostics/TraceContext.cs @ 65:653c4e04968b

minor changes
author cin
date Mon, 30 Jun 2014 13:55:22 +0400
parents edf0bc558596
children 790e8a997d30
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5 using System.Threading;
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6 using System.Threading.Tasks;
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7
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8 namespace Implab.Diagnostics {
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9 /// <summary>
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10 /// Контекст трассировки, привязывается к потоку и содержит в себе информацию о стеке логических операций.
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11 /// </summary>
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12 /// <remarks>
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13 /// Контекст трассировки передается слушателям событий для определения места, где возникло событие.
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14 /// </remarks>
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15 public class TraceContext {
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16 LogicalOperation m_currentOperation;
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17 readonly LogicalOperation m_bound;
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18 readonly int m_threadId;
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19
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20 [ThreadStatic]
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21 static TraceContext _current;
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22
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23 /// <summary>
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24 /// Текущий контекст трассировки для потока, создается астоматически при первом обращении.
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25 /// </summary>
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26 public static TraceContext Current {
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27 get {
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28 if (_current == null) {
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29 _current = new TraceContext();
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30 _current.LogEvent(TraceEventType.Created,"[{0}]", _current.ThreadId);
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31 }
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32 return _current;
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33 }
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34 }
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36 TraceContext(TraceContext context)
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37 : this(context, false) {
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38 }
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39
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40 TraceContext(TraceContext context, bool attach) {
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41 if (context == null)
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42 throw new ArgumentNullException("context");
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43
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44 m_currentOperation = context.CurrentOperation;
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45 m_bound = attach ? context.BoundOperation : context.CurrentOperation;
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46 m_threadId = Thread.CurrentThread.ManagedThreadId;
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47 }
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48
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49 TraceContext() {
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50 m_currentOperation = new LogicalOperation();
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51 m_bound = m_currentOperation;
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52 m_threadId = Thread.CurrentThread.ManagedThreadId;
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53 }
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54
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55 /// <summary>
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56 /// При необходимости копирует состояние контекста трассивровки в текущий поток.
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57 /// </summary>
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58 /// <param name="from">Исходный контекст трассировки, который передается.</param>
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59 /// <remarks>
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60 /// <para>
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61 /// Копирование происходит за счет создания нового контекста трассировки и заполнением его
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62 /// состояния из переданного контекста. При этом копируется стек операций, однако в новом
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63 /// контексте ранее начатые логические операции не могут быть завершены.
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64 /// </para>
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65 /// <para>
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66 /// Если передача состояния состоялась, то вызывается событие трассировки <see cref="TraceEventType.Fork"/>.
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67 /// </para>
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68 /// </remarks>
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69 public static void Fork(TraceContext from) {
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70 if (_current == from)
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71 return;
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72 if (from != null) {
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73 var context = new TraceContext(from);
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74 context.LogEvent(TraceEventType.Fork, "[{0}]-->[{1}]",from.ThreadId, context.ThreadId);
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75 _current = context;
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76 } else {
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77 _current = new TraceContext();
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78 }
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79 }
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80
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81 /// <summary>
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82 /// Задает текущему потоку указанный контекст, текущей поток может заканчивать ранее начатые
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83 /// логические операции в указанном контексте.
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84 /// </summary>
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85 /// <param name="source"></param>
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86 public static void Attach(TraceContext source) {
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87 if (_current == source)
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88 return;
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89 if (source != null) {
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90 var context = new TraceContext(source, true);
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91 context.LogEvent(TraceEventType.Attach, "[{0}]-->[{1}]", source.ThreadId, context.ThreadId);
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92 _current = context;
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93 } else {
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94 _current = new TraceContext();
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95 }
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96 }
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97
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98 /// <summary>
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99 /// Отсоединяет текущий контекст трассировки от потока, для дальнейшей его передачи другому потоку
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100 /// <see cref="Attach(TraceContext)"/>.
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101 /// </summary>
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102 /// <returns>Контекст трассировки потока</returns>
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103 /// <remarks>
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104 /// После отсоединения контекста трассировки от потока, при первом обращении к трассировке в этом
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105 /// потоке будет создан новый контекст.
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106 /// </remarks>
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107 public static TraceContext Detach() {
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108 var context = Current;
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109 context.LogEvent(TraceEventType.Detach, null);
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110 _current = null;
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111 return context;
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112 }
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113
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114 /// <summary>
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115 /// Создает постоянную копию текущего контекста, данную копию можно хранить и использовать для передачи через <see cref="Fork(TraceContext)"/>
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116 /// </summary>
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117 /// <returns>Копия текущего контекста трассировки.</returns>
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118 public static TraceContext Snapshot() {
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119 return _current == null ? new TraceContext() : new TraceContext(_current,false);
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120 }
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121
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122 /// <summary>
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123 /// Выполняет переданное действие в указанном контексте трассировки, по окончании восстанавливает предыдущий контекст трассировки потока.
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124 /// </summary>
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125 /// <param name="action"></param>
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126 public void Invoke(Action action) {
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127 if (action == null)
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128 throw new ArgumentNullException("action");
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129 var old = _current;
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130 Fork(this);
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131 try {
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132 action();
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133 } finally {
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134 if(_current != null)
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135 _current.EndAllOperations();
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136 _current = old;
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137 }
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138 }
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139
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140 /// <summary>
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141 /// Текущая логическая операция.
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142 /// </summary>
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143 public LogicalOperation CurrentOperation {
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144 get {
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145 return m_currentOperation;
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146 }
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147 }
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148
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149 /// <summary>
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150 /// Операция ниже которой нельзя опускаться в стеке логических операций, т.е. она не может быть завершена в текущем контексте.
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151 /// </summary>
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152 public LogicalOperation BoundOperation {
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153 get {
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154 return m_bound;
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155 }
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156 }
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157
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158 /// <summary>
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159 /// Поток, в котором создан контекст трассировки.
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160 /// </summary>
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161 public int ThreadId {
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162 get {
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163 return m_threadId;
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164 }
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165 }
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166
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167 /// <summary>
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168 /// Начинает безымянную логическую операцию.
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169 /// </summary>
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170 public void StartLogicalOperation() {
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171 StartLogicalOperation(null);
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172 }
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173
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174 /// <summary>
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175 /// Начинает логическую операцию с указанным именем. Созданная операция будет добвалена в стек логических операций контекста, затем будет создано соответсвующее событие.
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176 /// </summary>
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177 /// <param name="name">Имя начинаемой операции.</param>
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178 public void StartLogicalOperation(string name) {
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179 m_currentOperation = new LogicalOperation(name, m_currentOperation);
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180 LogEvent(TraceEventType.OperationStarted, name);
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181 }
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182
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183 /// <summary>
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184 /// Заканчивает логическую операцию начатую в текущем контексте. Операции, начатые в других контекстах не могут быть закончены в текущем контексте.
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185 /// </summary>
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186 /// <remarks>
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187 /// При вызове данного метода создается событие журнала трассировки, либо о завершении операции, либо об ошибки, поскольку данная операция
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188 /// начата в другом контексте.
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189 /// </remarks>
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190 public void EndLogicalOperation() {
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191 if (m_bound == m_currentOperation) {
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192 LogEvent(TraceEventType.Error, "Trying to end the operation which isn't belongs to current trace");
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193 } else {
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194 var op = m_currentOperation;
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195 LogEvent(TraceEventType.OperationCompleted, "{0} {1} ms", op.Name, op.Duration);
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196 m_currentOperation = m_currentOperation.Parent;
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197 }
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198 }
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199
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200 /// <summary>
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201 /// Создает копию контекста и возвращается на предыдущую операцию в текущем контексте, это позволяет начать операцию в одном потоке, а завершить - в другом.
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202 /// </summary>
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203 /// <returns>Контекст трассировки, который можно присоединить к другому потоку.</returns>
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204 public TraceContext DetachLogicalOperation() {
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205 if (m_bound == m_currentOperation) {
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206 return new TraceContext();
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207 } else {
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208 var detached = new TraceContext(this, true);
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209 m_currentOperation = m_currentOperation.Parent;
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210 return detached;
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211 }
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212 }
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213
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214 public void BindLogicalOperationToPromise(IPromiseBase promise) {
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215 Safe.ArgumentNotNull(promise, "promise");
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216
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217 var ctx = DetachLogicalOperation();
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218 promise.Finally(() => {
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219 var old = _current;
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220 TraceContext.Attach(ctx);
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221 TraceContext.Current.EndLogicalOperation();
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222 _current = old;
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223 });
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224 }
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225
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226 /// <summary>
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227 /// Заврешает все начатые в этом контексте операции
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228 /// </summary>
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229 public void EndAllOperations() {
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230 while (m_bound != m_currentOperation)
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231 EndLogicalOperation();
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232 }
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233
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234 void LogEvent(TraceEventType type, string format, params object[] args) {
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235 LogChannel<TraceEvent>.Default.LogEvent(this, TraceEvent.Create(type, format, args));
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236 }
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237 }
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238 }