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annotate Implab/Promise.cs @ 74:c4140283575c v2

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minor fixes
author cin
date Mon, 08 Sep 2014 17:40:46 +0400
parents d67b95eddaf4
children 4439140706d0
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Reflection;
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4 using System.Diagnostics;
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5 using System.Threading;
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6 using Implab.Parallels;
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7
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8 namespace Implab {
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9
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10 public delegate void ErrorHandler(Exception e);
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11 public delegate T ErrorHandler<out T>(Exception e);
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12 public delegate void ResultHandler<in T>(T result);
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13 public delegate TNew ResultMapper<in TSrc,out TNew>(TSrc result);
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14 public delegate IPromise<TNew> ChainedOperation<in TSrc,TNew>(TSrc result);
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15
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16 /// <summary>
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17 /// Класс для асинхронного получения результатов. Так называемое "обещание".
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18 /// </summary>
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19 /// <typeparam name="T">Тип получаемого результата</typeparam>
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20 /// <remarks>
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21 /// <para>Сервис при обращении к его методу дает обещаиние о выполнении операции,
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22 /// клиент получив такое обещание может установить ряд обратных вызово для получения
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23 /// событий выполнения обещания, тоесть завершения операции и предоставлении результатов.</para>
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24 /// <para>
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25 /// Обещение может быть как выполнено, так и выполнено с ошибкой. Для подписки на
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26 /// данные события клиент должен использовать методы <c>Then</c>.
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27 /// </para>
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28 /// <para>
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29 /// Сервис, в свою очередь, по окончанию выполнения операции (возможно с ошибкой),
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30 /// использует методы <c>Resolve</c> либо <c>Reject</c> для оповещения клиетна о
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31 /// выполнении обещания.
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32 /// </para>
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33 /// <para>
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34 /// Если сервер успел выполнить обещание еще до того, как клиент на него подписался,
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35 /// то в момент подписки клиента будут вызваны соответсвующие события в синхронном
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36 /// режиме и клиент будет оповещен в любом случае. Иначе, обработчики добавляются в
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37 /// список в порядке подписания и в этом же порядке они будут вызваны при выполнении
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38 /// обещания.
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39 /// </para>
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40 /// <para>
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41 /// Обрабатывая результаты обещания можно преобразовывать результаты либо инициировать
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42 /// связанные асинхронные операции, которые также возвращают обещания. Для этого следует
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43 /// использовать соответствующую форму методе <c>Then</c>.
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44 /// </para>
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45 /// <para>
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46 /// Также хорошим правилом является то, что <c>Resolve</c> и <c>Reject</c> должен вызывать
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47 /// только инициатор обещания иначе могут возникнуть противоречия.
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48 /// </para>
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49 /// </remarks>
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50 public class Promise<T> : IPromise<T> {
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51
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52 protected struct HandlerDescriptor {
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53 public ResultHandler<T> resultHandler;
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54 public ErrorHandler<T> errorHandler;
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55 public Action cancellHandler;
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56 public Promise<T> medium;
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57
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58 public void Resolve(T result) {
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59 if (resultHandler != null) {
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60 try {
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61 resultHandler(result);
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62 } catch (Exception e) {
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63 Reject(e);
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64 return;
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65 }
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66 }
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67 if (medium != null)
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68 medium.Resolve(result);
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69 }
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70
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71 public void Reject(Exception err) {
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72 if (errorHandler != null) {
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73 try {
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74 var res = errorHandler(err);
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75 if (medium != null)
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76 medium.Resolve(res);
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77 } catch (TransientPromiseException err2) {
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78 if (medium != null)
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79 medium.Reject(err2.InnerException);
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80 } catch (Exception err2) {
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81 if (medium != null)
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82 medium.Reject(err2);
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83 }
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84 } else if (medium != null)
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85 medium.Reject(err);
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86 }
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87
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88 public void Cancel() {
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89 if (cancellHandler != null) {
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90 try {
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91 cancellHandler();
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92 } catch (Exception err) {
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93 Reject(err);
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94 return;
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95 }
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96 }
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97 if (medium != null)
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98 medium.Cancel();
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99 }
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100 }
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101
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102 const int UNRESOLVED_SATE = 0;
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103 const int TRANSITIONAL_STATE = 1;
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104 const int SUCCEEDED_STATE = 2;
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105 const int REJECTED_STATE = 3;
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106 const int CANCELLED_STATE = 4;
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107
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108 readonly bool m_cancellable;
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109
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110 int m_childrenCount = 0;
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111 int m_state;
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112 T m_result;
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113 Exception m_error;
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114
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115 readonly MTQueue<HandlerDescriptor> m_handlers = new MTQueue<HandlerDescriptor>();
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116
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117 public Promise() {
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118 m_cancellable = true;
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119 }
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120
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121 public Promise(IPromise parent, bool cancellable) {
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122 m_cancellable = cancellable;
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123 if (parent != null)
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124 Cancelled(() => {
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125 if (parent.IsExclusive)
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126 parent.Cancel();
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127 });
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128 }
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129
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130 bool BeginTransit() {
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131 return UNRESOLVED_SATE == Interlocked.CompareExchange(ref m_state, TRANSITIONAL_STATE, UNRESOLVED_SATE);
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132 }
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133
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134 void CompleteTransit(int state) {
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135 if (TRANSITIONAL_STATE != Interlocked.CompareExchange(ref m_state, state, TRANSITIONAL_STATE))
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136 throw new InvalidOperationException("Can't complete transition when the object isn't in the transitional state");
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137 }
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138
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139 void WaitTransition() {
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140 while (m_state == TRANSITIONAL_STATE) {
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141 /* noop */
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142 }
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143 }
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144
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145 public bool IsResolved {
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146 get {
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147 return m_state > 1;
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148 }
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149 }
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150
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151 public bool IsCancelled {
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152 get {
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153 return m_state == CANCELLED_STATE;
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154 }
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155 }
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156
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157 public Type PromiseType {
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158 get { return typeof(T); }
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159 }
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160
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161 /// <summary>
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162 /// Выполняет обещание, сообщая об успешном выполнении.
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163 /// </summary>
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164 /// <param name="result">Результат выполнения.</param>
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165 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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166 public void Resolve(T result) {
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167 if (BeginTransit()) {
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168 m_result = result;
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169 CompleteTransit(SUCCEEDED_STATE);
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170 OnStateChanged();
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171 } else {
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172 WaitTransition();
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173 if (m_state != CANCELLED_STATE)
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174 throw new InvalidOperationException("The promise is already resolved");
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175 }
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176 }
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177
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178 /// <summary>
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179 /// Выполняет обещание, сообщая об успешном выполнении. Результатом выполнения будет пустое значения.
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180 /// </summary>
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181 /// <remarks>
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182 /// Данный вариант удобен в случаях, когда интересен факт выполнения операции, нежели полученное значение.
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183 /// </remarks>
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184 public void Resolve() {
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185 Resolve(default(T));
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186 }
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187
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188 /// <summary>
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189 /// Выполняет обещание, сообщая об ошибке
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190 /// </summary>
16
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191 /// <remarks>
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192 /// Поскольку обещание должно работать в многопточной среде, при его выполнении сразу несколько потоков
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193 /// могу вернуть ошибку, при этом только первая будет использована в качестве результата, остальные
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194 /// будут проигнорированы.
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195 /// </remarks>
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196 /// <param name="error">Исключение возникшее при выполнении операции</param>
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197 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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198 public void Reject(Exception error) {
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199 if (BeginTransit()) {
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200 m_error = error;
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201 CompleteTransit(REJECTED_STATE);
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202 OnStateChanged();
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203 } else {
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204 WaitTransition();
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205 if (m_state == SUCCEEDED_STATE)
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206 throw new InvalidOperationException("The promise is already resolved");
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207 }
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208 }
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209
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210 /// <summary>
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211 /// Отменяет операцию, если это возможно.
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212 /// </summary>
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213 /// <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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214 public bool Cancel() {
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215 if (m_cancellable && BeginTransit()) {
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216 CompleteTransit(CANCELLED_STATE);
33
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217 OnStateChanged();
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218 return true;
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219 }
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220 return false;
33
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221 }
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222
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223 // сделано для возвращаемого типа void
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224 protected void InternalCancel() {
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225 Cancel();
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226 }
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227
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228 /// <summary>
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229 /// Adds new handlers to this promise.
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230 /// </summary>
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231 /// <param name="success">The handler of the successfully completed operation.
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232 /// This handler will recieve an operation result as a parameter.</param>
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233 /// <param name="error">Handles an exception that may occur during the operation and returns the value which will be used as the result of the operation.</param>
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234 /// <returns>The new promise chained to this one.</returns>
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235 public IPromise<T> Then(ResultHandler<T> success, ErrorHandler<T> error) {
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236 if (success == null && error == null)
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237 return this;
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238
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239 var medium = new Promise<T>(this, true);
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240
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241 AddHandler(success, error, null, medium);
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242
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243 return medium;
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244 }
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245
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246 public IPromise Then(Action success, ErrorHandler error) {
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247 return Then(
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248 x => success(),
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249 e => {
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250 error(e);
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251 return default(T);
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252 }
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253 );
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254 }
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255
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256 public IPromise Then(Action success) {
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257 return Then(x => success());
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258 }
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259
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260
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261 public IPromise<T> Then(ResultHandler<T> success) {
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262 if (success == null)
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263 return this;
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264
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265 var medium = new Promise<T>(this, true);
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266
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267 AddHandler(success, null, null, medium);
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268
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269 return medium;
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270 }
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271
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272 public IPromise Error(ErrorHandler error) {
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273 if (error == null)
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274 return this;
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275
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276 var medium = new Promise<T>(this, true);
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277
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278 AddHandler(
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279 null,
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280 e => {
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281 error(e);
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282 return default(T);
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283 },
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284 null,
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285 medium
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286 );
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287
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288 return medium;
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289 }
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290
11
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291 /// <summary>
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292 /// Handles error and allows to keep the promise.
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293 /// </summary>
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294 /// <remarks>
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295 /// If the specified handler throws an exception, this exception will be used to reject the promise.
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296 /// </remarks>
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297 /// <param name="handler">The error handler which returns the result of the promise.</param>
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298 /// <returns>New promise.</returns>
26
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299 public IPromise<T> Error(ErrorHandler<T> handler) {
11
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300 if (handler == null)
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301 return this;
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302
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diff changeset
303 var medium = new Promise<T>(this, true);
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304
72
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305 AddHandler(null, handler, null, medium);
11
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306
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307 return medium;
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parents: 10
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308 }
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309
26
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310 public IPromise<T> Anyway(Action handler) {
6
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311 if (handler == null)
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312 return this;
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313
72
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314 var medium = new Promise<T>(this, true);
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315
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316 AddHandler(
72
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317 x => handler(),
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318 e => {
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319 handler();
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320 throw new TransientPromiseException(e);
6
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321 },
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diff changeset
322 null,
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diff changeset
323 medium
19
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324 );
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325
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326 return medium;
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327 }
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328
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329 /// <summary>
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330 /// Позволяет преобразовать результат выполения операции к новому типу.
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331 /// </summary>
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332 /// <typeparam name="TNew">Новый тип результата.</typeparam>
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333 /// <param name="mapper">Преобразование результата к новому типу.</param>
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334 /// <param name="error">Обработчик ошибки. Данный обработчик получит
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335 /// исключение возникшее при выполнении операции.</param>
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336 /// <returns>Новое обещание, которое будет выполнено при выполнении исходного обещания.</returns>
72
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337 public IPromise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler<T> error) {
6
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338 if (mapper == null)
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339 throw new ArgumentNullException("mapper");
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340
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341 // создаем прицепленное обещание
72
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342 var chained = new Promise<TNew>(this, true);
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343
19
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344 ResultHandler<T> resultHandler = result => chained.Resolve(mapper(result));
72
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345 ErrorHandler<T> errorHandler;
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346 if (error != null)
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diff changeset
347 errorHandler = e => {
19
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diff changeset
348 try {
72
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diff changeset
349 return error(e);
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diff changeset
350 } catch (Exception e2) {
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351 // в случае ошибки нужно передать исключение дальше по цепочке
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352 chained.Reject(e2);
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353 }
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354 return default(T);
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diff changeset
355 };
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diff changeset
356 else
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diff changeset
357 errorHandler = e => {
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358 chained.Reject(e);
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359 return default(T);
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diff changeset
360 };
19
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cin
parents: 16
diff changeset
361
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cin
parents: 16
diff changeset
362
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parents: 16
diff changeset
363 AddHandler(
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parents: 16
diff changeset
364 resultHandler,
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diff changeset
365 errorHandler,
72
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diff changeset
366 chained.InternalCancel,
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diff changeset
367 null
19
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368 );
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369
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370 return chained;
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diff changeset
371 }
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372
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373 public IPromise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper) {
6
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374 return Map(mapper, null);
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375 }
2
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diff changeset
376
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377 /// <summary>
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378 /// Сцепляет несколько аснхронных операций. Указанная асинхронная операция будет вызвана после
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
379 /// выполнения текущей, а результат текущей операции может быть использован для инициализации
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
380 /// новой операции.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
381 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
382 /// <typeparam name="TNew">Тип результата указанной асинхронной операции.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
383 /// <param name="chained">Асинхронная операция, которая должна будет начаться после выполнения текущей.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
384 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
385 /// исключение возникшее при выполнении текуещй операции.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
386 /// <returns>Новое обещание, которое будет выполнено по окончанию указанной аснхронной операции.</returns>
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
387 public IPromise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained, ErrorHandler<T> error) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
388
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
389 // проблема в том, что на момент связывания еще не начата асинхронная операция, поэтому нужно
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
390 // создать посредника, к которому будут подвызяваться следующие обработчики.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
391 // когда будет выполнена реальная асинхронная операция, она обратиться к посреднику, чтобы
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
392 // передать через него результаты работы.
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
393 var medium = new Promise<TNew>(this, true);
2
aa367305156b small fixes
cin
parents: 1
diff changeset
394
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
395 ResultHandler<T> resultHandler = delegate(T result) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
396 if (medium.IsCancelled)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
397 return;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
398
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
399 var promise = chained(result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
400
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
401 promise.Then(
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
402 medium.Resolve,
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
403 err => {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
404 medium.Reject(err);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
405 throw new TransientPromiseException(err);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
406 }
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
407 );
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
408
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
409 // notify chained operation that it's not needed anymore
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
410 // порядок вызова Then, Cancelled важен, поскольку от этого
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
411 // зависит IsExclusive
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
412 medium.Cancelled(() => {
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
413 if (promise.IsExclusive)
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
414 promise.Cancel();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
415 });
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
416
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
417 // внешняя отмена связанной операции рассматривается как ошибка
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
418 promise.Cancelled(() => medium.Reject(new OperationCanceledException()));
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
419 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
420
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
421 ErrorHandler<T> errorHandler = delegate(Exception e) {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
422 if (error != null) {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
423 try {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
424 return error(e);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
425 } catch (Exception e2) {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
426 medium.Reject(e2);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
427 return default(T);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
428 }
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
429 }
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
430 // в случае ошибки нужно передать исключение дальше по цепочке
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
431 medium.Reject(e);
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
432 return default(T);
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
433 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
434
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
435 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
436 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
437 errorHandler,
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
438 medium.InternalCancel,
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
439 null
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
440 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
441
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
442 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
443 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
444
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
445 public IPromise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
446 return Chain(chained, null);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
447 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
448
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
449 public IPromise<T> Cancelled(Action handler) {
74
c4140283575c minor fixes
cin
parents: 72
diff changeset
450 var medium = new Promise<T>(this, true);
c4140283575c minor fixes
cin
parents: 72
diff changeset
451 AddHandler(null, null, handler, medium);
c4140283575c minor fixes
cin
parents: 72
diff changeset
452 return medium;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
453 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
454
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
455 /// <summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
456 /// Adds the specified handler for all cases (success, error, cancel)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
457 /// </summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
458 /// <param name="handler">The handler that will be called anyway</param>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
459 /// <returns>self</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
460 public IPromise<T> Finally(Action handler) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
461 if (handler == null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
462 throw new ArgumentNullException("handler");
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
463 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
464 x => handler(),
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
465 e => {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
466 handler();
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
467 throw new TransientPromiseException(e);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
468 },
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
469 handler,
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
470 null
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
471 );
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
472 return this;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
473 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
474
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
475 /// <summary>
29
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
476 /// Преобразует результат обещания к нужному типу
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
477 /// </summary>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
478 /// <typeparam name="T2"></typeparam>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
479 /// <returns></returns>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
480 public IPromise<T2> Cast<T2>() {
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
481 return Map(x => (T2)(object)x, null);
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
482 }
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
483
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
484 /// <summary>
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
485 /// Дожидается отложенного обещания и в случае успеха, возвращает
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
486 /// его, результат, в противном случае бросает исключение.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
487 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
488 /// <remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
489 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
490 /// Если ожидание обещания было прервано по таймауту, это не значит,
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
491 /// что обещание было отменено или что-то в этом роде, это только
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
492 /// означает, что мы его не дождались, однако все зарегистрированные
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
493 /// обработчики, как были так остались и они будут вызваны, когда
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
494 /// обещание будет выполнено.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
495 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
496 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
497 /// Такое поведение вполне оправдано поскольку таймаут может истечь
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
498 /// в тот момент, когда началась обработка цепочки обработчиков, и
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
499 /// к тому же текущее обещание может стоять в цепочке обещаний и его
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
500 /// отклонение может привести к непрогнозируемому результату.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
501 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
502 /// </remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
503 /// <param name="timeout">Время ожидания</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
504 /// <returns>Результат выполнения обещания</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
505 public T Join(int timeout) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
506 var evt = new ManualResetEvent(false);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
507 Anyway(() => evt.Set());
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
508 Cancelled(() => evt.Set());
2
aa367305156b small fixes
cin
parents: 1
diff changeset
509
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
510 if (!evt.WaitOne(timeout, true))
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
511 throw new TimeoutException();
2
aa367305156b small fixes
cin
parents: 1
diff changeset
512
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
513 switch (m_state) {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
514 case SUCCEEDED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
515 return m_result;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
516 case CANCELLED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
517 throw new OperationCanceledException();
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
518 case REJECTED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
519 throw new TargetInvocationException(m_error);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
520 default:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
521 throw new ApplicationException(String.Format("Invalid promise state {0}", m_state));
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
522 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
523 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
524
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
525 public T Join() {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
526 return Join(Timeout.Infinite);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
527 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
528
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
529 void AddHandler(ResultHandler<T> success, ErrorHandler<T> error, Action cancel, Promise<T> medium) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
530 if (success != null || error != null)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
531 Interlocked.Increment(ref m_childrenCount);
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
532
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
533 var handler = new HandlerDescriptor {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
534 resultHandler = success,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
535 errorHandler = error,
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
536 cancellHandler = cancel,
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
537 medium = medium
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
538 };
2
aa367305156b small fixes
cin
parents: 1
diff changeset
539
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
540 bool queued;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
541
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
542 if (!IsResolved) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
543 m_handlers.Enqueue(handler);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
544 queued = true;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
545 } else {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
546 // the promise is in resolved state, just invoke the handled with minimum overhead
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
547 queued = false;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
548 InvokeHandler(handler);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
549 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
550
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
551 if (queued && IsResolved && m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
552 // if the promise have been resolved while we was adding handler to the queue
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
553 // we can't guarantee that someone is still processing it
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
554 // therefore we will fetch a handler from the queue and execute it
27
cin
parents: 26
diff changeset
555 // note that fetched handler may be not the one that we have added
cin
parents: 26
diff changeset
556 // even we can fetch no handlers at all :)
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
557 InvokeHandler(handler);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
558 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
559
27
cin
parents: 26
diff changeset
560 protected virtual void InvokeHandler(HandlerDescriptor handler) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
561 switch (m_state) {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
562 case SUCCEEDED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
563 handler.Resolve(m_result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
564 break;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
565 case REJECTED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
566 handler.Reject(m_error);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
567 break;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
568 case CANCELLED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
569 handler.Cancel();
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
570 break;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
571 default:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
572 // do nothing
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
573 return;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
574 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
575 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
576
65
653c4e04968b minor changes
cin
parents: 33
diff changeset
577 void OnStateChanged() {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
578 HandlerDescriptor handler;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
579 while (m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
580 InvokeHandler(handler);
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
581 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
582
9
cin
parents: 7
diff changeset
583 public bool IsExclusive {
cin
parents: 7
diff changeset
584 get {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
585 return m_childrenCount <= 1;
9
cin
parents: 7
diff changeset
586 }
cin
parents: 7
diff changeset
587 }
cin
parents: 7
diff changeset
588
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
589 /// <summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
590 /// Объединяет несколько обещаний в одно, результатом которого является массив результатов других обещаний.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
591 /// Если хотябы одно из переданных обещаний не будет выполнено, то новое обещение тоже не будет выполнено.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
592 /// При отмене нового обещания, переданные обещания также будут отменены, если никто больше на них не подписан.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
593 /// </summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
594 /// <param name="promises">Список обещаний. Если список пустой, то результирующее обещание возвращается уже выполненным.</param>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
595 /// <returns>Обещание объединяющее в себе результат переданных обещаний.</returns>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
596 /// <exception cref="ArgumentNullException"><paramref name="promises"/> не может быть null</exception>
30
2fad2d1f4b03 small refactoring, cleanup.
cin
parents: 29
diff changeset
597 public static IPromise<T[]> CreateComposite(IList<IPromise<T>> promises) {
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
598 if (promises == null)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
599 throw new ArgumentNullException();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
600
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
601 // создаем аккумулятор для результатов и результирующее обещание
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
602 var result = new T[promises.Count];
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
603 var promise = new Promise<T[]>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
604
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
605 // special case
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
606 if (promises.Count == 0) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
607 promise.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
608 return promise;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
609 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
610
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
611 int pending = promises.Count;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
612
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
613 for (int i = 0; i < promises.Count; i++) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
614 var dest = i;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
615
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
616 if (promises[i] != null) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
617 promises[i].Then(
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
618 x => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
619 result[dest] = x;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
620 if (Interlocked.Decrement(ref pending) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
621 promise.Resolve(result);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
622 },
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
623 e => {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
624 promise.Reject(e);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
625 return default(T);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
626 }
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
627 );
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
628 } else {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
629 if (Interlocked.Decrement(ref pending) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
630 promise.Resolve(result);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
631 }
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
632 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
633
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
634 promise.Cancelled(
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
635 () => {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
636 foreach (var d in promises)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
637 if (d != null && d.IsExclusive)
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
638 d.Cancel();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
639 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
640 );
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
641
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
642 return promise;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
643 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
644
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
645 /// <summary>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
646 /// Объединяет несколько обещаний в одно. Результирующее обещание будет выполнено при
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
647 /// выполнении всех указанных обещаний. При этом возвращаемые значения первичных обещаний
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
648 /// игнорируются.
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
649 /// </summary>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
650 /// <param name="promises">Коллекция первичных обещаний, которые будут объеденены в одно.</param>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
651 /// <returns>Новое обещание, объединяющее в себе переданные.</returns>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
652 /// <remarks>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
653 /// Если в коллекции встречаюься <c>null</c>, то они воспринимаются как выполненные обещания.
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
654 /// </remarks>
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
655 public static IPromise CreateComposite(ICollection<IPromise> promises) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
656 if (promises == null)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
657 throw new ArgumentNullException();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
658 if (promises.Count == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
659 return Promise<object>.ResultToPromise(null);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
660
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
661 int countdown = promises.Count;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
662
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
663 var result = new Promise<object>();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
664
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
665 foreach (var d in promises) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
666 if (d == null) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
667 if (Interlocked.Decrement(ref countdown) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
668 result.Resolve(null);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
669 } else {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
670 d.Then(() => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
671 if (Interlocked.Decrement(ref countdown) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
672 result.Resolve(null);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
673 });
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
674 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
675 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
676
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
677 result.Cancelled(() => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
678 foreach (var d in promises)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
679 if (d != null && d.IsExclusive)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
680 d.Cancel();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
681 });
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
682
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
683 return result;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
684 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
685
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
686 public static Promise<T> ResultToPromise(T result) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
687 var p = new Promise<T>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
688 p.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
689 return p;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
690 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
691
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
692 public static Promise<T> ExceptionToPromise(Exception error) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
693 if (error == null)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
694 throw new ArgumentNullException();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
695
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
696 var p = new Promise<T>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
697 p.Reject(error);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
698 return p;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
699 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
700
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
701 #region IPromiseBase explicit implementation
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
702
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
703 IPromise IPromise.Error(ErrorHandler error) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
704 return Error(error);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
705 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
706
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
707 IPromise IPromise.Anyway(Action handler) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
708 return Anyway(handler);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
709 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
710
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
711 IPromise IPromise.Finally(Action handler) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
712 return Finally(handler);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
713 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
714
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
715 IPromise IPromise.Cancelled(Action handler) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
716 return Cancelled(handler);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
717 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
718
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
719 void IPromise.Join() {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
720 Join();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
721 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
722
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
723 void IPromise.Join(int timeout) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
724 Join(timeout);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
725 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
726
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
727 #endregion
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
728
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
729
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
730
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
731 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
732 }