Mercurial > pub > ImplabNet
annotate Implab/Promise.cs @ 6:dfa21d507bc5
*refactoring: Promise.Then now returns a new chained promise
*fixed bug with animations when multiple events fired simultaneously
author | cin |
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date | Mon, 21 Oct 2013 02:34:31 +0400 |
parents | aa367305156b |
children | 7ea9363fef6c |
rev | line source |
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2 | 1 using System; |
2 using System.Collections.Generic; | |
3 using System.Linq; | |
4 using System.Reflection; | |
5 using System.Text; | |
6 using System.Diagnostics; | |
7 using System.Threading; | |
8 | |
9 namespace Implab { | |
10 | |
6
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11 public delegate void ErrorHandler(Exception e); |
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12 |
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13 public delegate void ResultHandler<T>(T result); |
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14 public delegate TNew ResultMapper<TSrc, TNew>(TSrc result); |
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15 public delegate Promise<TNew> ChainedOperation<TSrc, TNew>(TSrc result); |
2 | 16 |
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17 /// <summary> |
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18 /// Класс для асинхронного получения результатов. Так называемое "обещание". |
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19 /// </summary> |
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20 /// <typeparam name="T">Тип получаемого результата</typeparam> |
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21 /// <remarks> |
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22 /// <para>Сервис при обращении к его методу дает обещаиние о выполнении операции, |
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23 /// клиент получив такое обещание может установить ряд обратных вызово для получения |
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24 /// событий выполнения обещания, тоесть завершения операции и предоставлении результатов.</para> |
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25 /// <para> |
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26 /// Обещение может быть как выполнено, так и выполнено с ошибкой. Для подписки на |
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27 /// данные события клиент должен использовать методы <c>Then</c>. |
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28 /// </para> |
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29 /// <para> |
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30 /// Сервис, в свою очередь, по окончанию выполнения операции (возможно с ошибкой), |
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31 /// использует методы <c>Resolve</c> либо <c>Reject</c> для оповещения клиетна о |
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32 /// выполнении обещания. |
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33 /// </para> |
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34 /// <para> |
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35 /// Если сервер успел выполнить обещание еще до того, как клиент на него подписался, |
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36 /// то в момент подписки клиента будут вызваны соответсвующие события в синхронном |
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37 /// режиме и клиент будет оповещен в любом случае. Иначе, обработчики добавляются в |
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38 /// список в порядке подписания и в этом же порядке они будут вызваны при выполнении |
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39 /// обещания. |
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40 /// </para> |
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41 /// <para> |
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42 /// Обрабатывая результаты обещания можно преобразовывать результаты либо инициировать |
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43 /// связанные асинхронные операции, которые также возвращают обещания. Для этого следует |
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44 /// использовать соответствующую форму методе <c>Then</c>. |
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45 /// </para> |
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46 /// <para> |
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47 /// Также хорошим правилом является то, что <c>Resolve</c> и <c>Reject</c> должен вызывать |
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48 /// только инициатор обещания иначе могут возникнуть противоречия. |
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49 /// </para> |
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50 /// </remarks> |
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51 public class Promise<T> { |
2 | 52 |
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53 struct ResultHandlerInfo { |
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54 public ResultHandler<T> resultHandler; |
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55 public ErrorHandler errorHandler; |
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56 } |
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57 |
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58 enum State { |
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59 Unresolved, |
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60 Resolving, |
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61 Resolved, |
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62 Cancelled |
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63 } |
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64 |
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65 LinkedList<ResultHandlerInfo> m_handlersChain = new LinkedList<ResultHandlerInfo>(); |
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66 State m_state; |
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67 bool m_cancellable; |
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68 T m_result; |
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69 Exception m_error; |
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70 |
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71 public Promise() { |
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72 m_cancellable = true; |
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73 } |
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75 /// <summary> |
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76 /// Событие, возникающее при отмене асинхронной операции. |
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77 /// </summary> |
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78 /// <description> |
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79 /// Как правило используется для оповещения объекта, выполняющего асинхронную операцию, о том, что ее следует отменить. |
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80 /// </description> |
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81 public event EventHandler Cancelled; |
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83 /// <summary> |
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84 /// Выполняет обещание, сообщая об успешном выполнении. |
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85 /// </summary> |
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86 /// <param name="result">Результат выполнения.</param> |
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87 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception> |
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88 public void Resolve(T result) { |
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89 lock (this) { |
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90 if (m_state == State.Cancelled) |
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91 return; |
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92 if (m_state != State.Unresolved) |
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93 throw new InvalidOperationException("The promise is already resolved"); |
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94 m_result = result; |
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95 m_state = State.Resolving; |
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96 } |
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98 ResultHandlerInfo handler; |
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99 while (FetchNextHandler(out handler)) |
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100 InvokeHandler(handler); |
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101 } |
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103 /// <summary> |
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104 /// Выполняет обещание, сообщая об ошибке |
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105 /// </summary> |
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106 /// <param name="error">Исключение возникшее при выполнении операции</param> |
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107 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception> |
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108 public void Reject(Exception error) { |
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109 lock (this) { |
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110 if (m_state == State.Cancelled) |
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111 return; |
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112 if (m_state != State.Unresolved) |
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113 throw new InvalidOperationException("The promise is already resolved"); |
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114 m_error = error; |
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115 m_state = State.Resolving; |
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116 } |
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118 ResultHandlerInfo handler; |
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119 while (FetchNextHandler(out handler)) |
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120 InvokeHandler(handler); |
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121 } |
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123 /// <summary> |
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124 /// Отменяет операцию, если это возможно. |
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125 /// </summary> |
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126 /// <returns><c>true</c> Операция была отменена, обработчики не будут вызваны.<c>false</c> отмена не возможна, поскольку обещание уже выполнено и обработчики отработали.</returns> |
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127 public bool Cancel() { |
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128 lock (this) { |
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129 if (m_state == State.Unresolved && m_cancellable) { |
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130 m_state = State.Cancelled; |
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131 EventHandler temp = Cancelled; |
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132 |
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133 if (temp != null) |
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134 temp(this, new EventArgs()); |
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135 |
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136 return true; |
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137 } else |
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138 return false; |
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139 } |
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140 } |
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142 /// <summary> |
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143 /// Добавляет обработчики событий выполнения обещания. |
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144 /// </summary> |
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145 /// <param name="success">Обработчик успешного выполнения обещания. |
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146 /// Данному обработчику будет передан результат выполнения операции.</param> |
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147 /// <param name="error">Обработчик ошибки. Данный обработчик получит |
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148 /// исключение возникшее при выполнении операции.</param> |
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149 /// <returns>Само обещание</returns> |
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150 public Promise<T> Then(ResultHandler<T> success, ErrorHandler error) { |
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151 if (success == null && error == null) |
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152 return this; |
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153 |
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154 var medium = new Promise<T>(); |
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155 |
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156 var handlerInfo = new ResultHandlerInfo(); |
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157 |
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158 if (success != null) |
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159 handlerInfo.resultHandler = x => { |
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160 try { |
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161 success(x); |
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162 medium.Resolve(x); |
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163 } catch (Exception e) { |
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164 medium.Reject(e); |
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165 } |
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166 }; |
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167 else |
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168 handlerInfo.resultHandler = x => medium.Resolve(x); |
2 | 169 |
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170 if (error != null) |
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171 handlerInfo.errorHandler = x => { |
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172 try { |
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173 error(x); |
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174 } catch { } |
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175 medium.Reject(x); |
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176 }; |
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177 else |
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178 handlerInfo.errorHandler = x => medium.Reject(x); |
2 | 179 |
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180 AddHandler(handlerInfo); |
2 | 181 |
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182 return medium; |
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183 } |
2 | 184 |
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185 public Promise<T> Then(ResultHandler<T> success) { |
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186 return Then(success, null); |
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187 } |
2 | 188 |
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189 public Promise<T> Error(ErrorHandler error) { |
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190 return Then(null, error); |
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191 } |
2 | 192 |
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193 public Promise<T> Anyway(Action handler) { |
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194 if (handler == null) |
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195 return this; |
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196 |
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197 var medium = new Promise<T>(); |
2 | 198 |
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199 AddHandler(new ResultHandlerInfo { |
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200 resultHandler = x => { |
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201 try { |
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202 handler(); |
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203 medium.Resolve(x); |
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204 } catch (Exception e) { |
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205 medium.Reject(e); |
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206 } |
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207 }, |
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208 errorHandler = x => { |
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209 try { |
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210 handler(); |
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211 } catch { } |
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212 medium.Reject(x); |
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213 } |
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214 }); |
2 | 215 |
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216 return medium; |
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217 } |
2 | 218 |
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219 /// <summary> |
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220 /// Позволяет преобразовать результат выполения операции к новому типу. |
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221 /// </summary> |
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222 /// <typeparam name="TNew">Новый тип результата.</typeparam> |
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223 /// <param name="mapper">Преобразование результата к новому типу.</param> |
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224 /// <param name="error">Обработчик ошибки. Данный обработчик получит |
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225 /// исключение возникшее при выполнении операции.</param> |
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226 /// <returns>Новое обещание, которое будет выполнено при выполнении исходного обещания.</returns> |
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227 public Promise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler error) { |
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228 if (mapper == null) |
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229 throw new ArgumentNullException("mapper"); |
2 | 230 |
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231 // создаем прицепленное обещание |
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232 Promise<TNew> chained = new Promise<TNew>(); |
2 | 233 |
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234 AddHandler(new ResultHandlerInfo() { |
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235 resultHandler = delegate(T result) { |
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236 try { |
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237 // если преобразование выдаст исключение, то сработает reject сцепленного deferred |
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238 chained.Resolve(mapper(result)); |
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239 } catch (Exception e) { |
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240 chained.Reject(e); |
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241 } |
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242 }, |
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243 errorHandler = delegate(Exception e) { |
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244 if (error != null) |
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245 error(e); |
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246 // в случае ошибки нужно передать исключение дальше по цепочке |
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247 chained.Reject(e); |
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248 } |
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249 }); |
2 | 250 |
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251 return chained; |
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252 } |
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253 |
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254 public Promise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper) { |
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255 return Map(mapper, null); |
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256 } |
2 | 257 |
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258 /// <summary> |
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259 /// Сцепляет несколько аснхронных операций. Указанная асинхронная операция будет вызвана после |
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260 /// выполнения текущей, а результат текущей операции может быть использован для инициализации |
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261 /// новой операции. |
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262 /// </summary> |
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263 /// <typeparam name="TNew">Тип результата указанной асинхронной операции.</typeparam> |
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264 /// <param name="chained">Асинхронная операция, которая должна будет начаться после выполнения текущей.</param> |
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265 /// <param name="error">Обработчик ошибки. Данный обработчик получит |
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266 /// исключение возникшее при выполнении текуещй операции.</param> |
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267 /// <returns>Новое обещание, которое будет выполнено по окончанию указанной аснхронной операции.</returns> |
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268 public Promise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained, ErrorHandler error) { |
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269 |
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270 // проблема в том, что на момент связывания еще не начата асинхронная операция, поэтому нужно |
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271 // создать посредника, к которому будут подвызяваться следующие обработчики. |
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272 // когда будет выполнена реальная асинхронная операция, она обратиться к посреднику, чтобы |
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273 // передать через него результаты работы. |
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274 Promise<TNew> medium = new Promise<TNew>(); |
2 | 275 |
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276 AddHandler(new ResultHandlerInfo() { |
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277 resultHandler = delegate(T result) { |
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278 try { |
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279 chained(result).Then( |
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280 x => medium.Resolve(x), |
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281 e => medium.Reject(e) |
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282 ); |
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283 } catch (Exception e) { |
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284 // если сцепленное действие выдало исключение вместо обещания, то передаем ошибку по цепочке |
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285 medium.Reject(e); |
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286 } |
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287 }, |
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288 errorHandler = delegate(Exception e) { |
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289 if (error != null) |
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290 error(e); |
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291 // в случае ошибки нужно передать исключение дальше по цепочке |
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292 medium.Reject(e); |
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293 } |
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294 }); |
2 | 295 |
6
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296 return medium; |
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297 } |
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298 |
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299 public Promise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained) { |
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300 return Chain(chained, null); |
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301 } |
2 | 302 |
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303 /// <summary> |
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304 /// Дожидается отложенного обещания и в случае успеха, возвращает |
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305 /// его, результат, в противном случае бросает исключение. |
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306 /// </summary> |
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307 /// <remarks> |
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308 /// <para> |
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309 /// Если ожидание обещания было прервано по таймауту, это не значит, |
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310 /// что обещание было отменено или что-то в этом роде, это только |
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311 /// означает, что мы его не дождались, однако все зарегистрированные |
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312 /// обработчики, как были так остались и они будут вызваны, когда |
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313 /// обещание будет выполнено. |
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314 /// </para> |
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315 /// <para> |
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316 /// Такое поведение вполне оправдано поскольку таймаут может истечь |
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317 /// в тот момент, когда началась обработка цепочки обработчиков, и |
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318 /// к тому же текущее обещание может стоять в цепочке обещаний и его |
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319 /// отклонение может привести к непрогнозируемому результату. |
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320 /// </para> |
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321 /// </remarks> |
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322 /// <param name="timeout">Время ожидания</param> |
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323 /// <returns>Результат выполнения обещания</returns> |
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324 public T Join(int timeout) { |
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325 ManualResetEvent evt = new ManualResetEvent(false); |
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326 Anyway(() => evt.Set()); |
2 | 327 |
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328 if (!evt.WaitOne(timeout, true)) |
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329 throw new TimeoutException(); |
2 | 330 |
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331 if (m_error != null) |
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332 throw new TargetInvocationException(m_error); |
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333 else |
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334 return m_result; |
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335 } |
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336 |
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337 public T Join() { |
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338 return Join(Timeout.Infinite); |
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339 } |
2 | 340 |
6
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341 /// <summary> |
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342 /// Данный метод последовательно извлекает обработчики обещания и когда |
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343 /// их больше не осталось - ставит состояние "разрешено". |
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344 /// </summary> |
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345 /// <param name="handler">Информация об обработчике</param> |
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346 /// <returns>Признак того, что еще остались обработчики в очереди</returns> |
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347 bool FetchNextHandler(out ResultHandlerInfo handler) { |
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348 handler = default(ResultHandlerInfo); |
2 | 349 |
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350 lock (this) { |
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351 Debug.Assert(m_state == State.Resolving); |
2 | 352 |
6
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353 if (m_handlersChain.Count > 0) { |
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354 handler = m_handlersChain.First.Value; |
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355 m_handlersChain.RemoveFirst(); |
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356 return true; |
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357 } else { |
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358 m_state = State.Resolved; |
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359 return false; |
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360 } |
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361 } |
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362 } |
2 | 363 |
6
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364 void AddHandler(ResultHandlerInfo handler) { |
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365 bool invokeRequired = false; |
2 | 366 |
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367 lock (this) { |
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368 if (m_state != State.Resolved) |
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369 m_handlersChain.AddLast(handler); |
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370 else |
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371 invokeRequired = true; |
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372 } |
2 | 373 |
6
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374 // обработчики не должны блокировать сам объект |
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375 if (invokeRequired) |
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376 InvokeHandler(handler); |
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377 } |
2 | 378 |
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379 void InvokeHandler(ResultHandlerInfo handler) { |
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380 if (m_error == null) { |
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381 try { |
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382 if (handler.resultHandler != null) |
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383 handler.resultHandler(m_result); |
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384 } catch { } |
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385 } |
2 | 386 |
6
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387 if (m_error != null) { |
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388 try { |
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389 if (handler.errorHandler != null) |
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390 handler.errorHandler(m_error); |
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391 } catch { } |
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392 } |
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393 } |
2 | 394 |
395 | |
6
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396 } |
2 | 397 } |