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annotate Implab/Promise.cs @ 79:05e6468f066f v2

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author cin
date Mon, 22 Sep 2014 18:20:49 +0400
parents c761fc982e1d
children 4f20870d0816
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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
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15 /// <summary>
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16 /// Класс для асинхронного получения результатов. Так называемое "обещание".
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17 /// </summary>
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18 /// <typeparam name="T">Тип получаемого результата</typeparam>
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19 /// <remarks>
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20 /// <para>Сервис при обращении к его методу дает обещаиние о выполнении операции,
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21 /// клиент получив такое обещание может установить ряд обратных вызово для получения
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22 /// событий выполнения обещания, тоесть завершения операции и предоставлении результатов.</para>
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23 /// <para>
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24 /// Обещение может быть как выполнено, так и выполнено с ошибкой. Для подписки на
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25 /// данные события клиент должен использовать методы <c>Then</c>.
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26 /// </para>
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27 /// <para>
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28 /// Сервис, в свою очередь, по окончанию выполнения операции (возможно с ошибкой),
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29 /// использует методы <c>Resolve</c> либо <c>Reject</c> для оповещения клиетна о
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30 /// выполнении обещания.
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31 /// </para>
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32 /// <para>
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33 /// Если сервер успел выполнить обещание еще до того, как клиент на него подписался,
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34 /// то в момент подписки клиента будут вызваны соответсвующие события в синхронном
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35 /// режиме и клиент будет оповещен в любом случае. Иначе, обработчики добавляются в
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36 /// список в порядке подписания и в этом же порядке они будут вызваны при выполнении
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37 /// обещания.
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38 /// </para>
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39 /// <para>
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40 /// Обрабатывая результаты обещания можно преобразовывать результаты либо инициировать
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41 /// связанные асинхронные операции, которые также возвращают обещания. Для этого следует
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42 /// использовать соответствующую форму методе <c>Then</c>.
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43 /// </para>
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44 /// <para>
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45 /// Также хорошим правилом является то, что <c>Resolve</c> и <c>Reject</c> должен вызывать
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46 /// только инициатор обещания иначе могут возникнуть противоречия.
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47 /// </para>
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48 /// </remarks>
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49 public class Promise<T> : IPromise<T> {
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50
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51 protected struct HandlerDescriptor {
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52 public ResultHandler<T> resultHandler;
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53 public ErrorHandler<T> errorHandler;
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54 public Action cancellHandler;
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55 public Promise<T> medium;
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56
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57 public void Resolve(T result) {
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58 if (resultHandler != null) {
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59 try {
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60 resultHandler(result);
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61 } catch (Exception e) {
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62 Reject(e);
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63 return;
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64 }
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65 }
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66 if (medium != null)
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67 medium.Resolve(result);
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68 }
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69
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70 public void Reject(Exception err) {
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71 if (errorHandler != null) {
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72 try {
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73 var res = errorHandler(err);
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74 if (medium != null)
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75 medium.Resolve(res);
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76 } catch (TransientPromiseException err2) {
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77 if (medium != null)
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78 medium.Reject(err2.InnerException);
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79 } catch (Exception err2) {
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80 if (medium != null)
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81 medium.Reject(err2);
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82 }
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83 } else if (medium != null)
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84 medium.Reject(err);
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85 }
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86
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87 public void Cancel() {
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88 if (cancellHandler != null) {
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89 try {
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90 cancellHandler();
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91 } catch (Exception err) {
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92 Reject(err);
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93 return;
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94 }
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95 }
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96 if (medium != null)
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97 medium.Cancel();
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98 }
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99 }
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100
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101 const int UNRESOLVED_SATE = 0;
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102 const int TRANSITIONAL_STATE = 1;
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103 const int SUCCEEDED_STATE = 2;
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104 const int REJECTED_STATE = 3;
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105 const int CANCELLED_STATE = 4;
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106
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107 readonly bool m_cancellable;
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108
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109 int m_childrenCount = 0;
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110 int m_state;
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111 T m_result;
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112 Exception m_error;
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113
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114 readonly MTQueue<HandlerDescriptor> m_handlers = new MTQueue<HandlerDescriptor>();
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115
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116 public Promise() {
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117 m_cancellable = true;
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118 }
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119
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120 public Promise(IPromise parent, bool cancellable) {
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121 m_cancellable = cancellable;
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122 if (parent != null)
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123 AddHandler(
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124 null,
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125 null,
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126 () => {
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127 if (parent.IsExclusive)
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128 parent.Cancel();
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129 },
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130 null
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131 );
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132 }
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133
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134 bool BeginTransit() {
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135 return UNRESOLVED_SATE == Interlocked.CompareExchange(ref m_state, TRANSITIONAL_STATE, UNRESOLVED_SATE);
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136 }
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137
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138 void CompleteTransit(int state) {
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139 if (TRANSITIONAL_STATE != Interlocked.CompareExchange(ref m_state, state, TRANSITIONAL_STATE))
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140 throw new InvalidOperationException("Can't complete transition when the object isn't in the transitional state");
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141 }
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142
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143 void WaitTransition() {
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144 while (m_state == TRANSITIONAL_STATE) {
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145 /* noop */
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146 }
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147 }
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148
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149 public bool IsResolved {
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150 get {
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151 return m_state > 1;
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152 }
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153 }
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154
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155 public bool IsCancelled {
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156 get {
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157 return m_state == CANCELLED_STATE;
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158 }
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159 }
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160
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161 public Type PromiseType {
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162 get { return typeof(T); }
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163 }
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164
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165 /// <summary>
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166 /// Выполняет обещание, сообщая об успешном выполнении.
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167 /// </summary>
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168 /// <param name="result">Результат выполнения.</param>
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169 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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170 public void Resolve(T result) {
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171 if (BeginTransit()) {
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172 m_result = result;
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173 CompleteTransit(SUCCEEDED_STATE);
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174 OnStateChanged();
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175 } else {
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176 WaitTransition();
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177 if (m_state != CANCELLED_STATE)
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178 throw new InvalidOperationException("The promise is already resolved");
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179 }
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180 }
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181
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182 /// <summary>
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183 /// Выполняет обещание, сообщая об успешном выполнении. Результатом выполнения будет пустое значения.
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184 /// </summary>
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185 /// <remarks>
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186 /// Данный вариант удобен в случаях, когда интересен факт выполнения операции, нежели полученное значение.
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187 /// </remarks>
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188 public void Resolve() {
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189 Resolve(default(T));
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190 }
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191
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192 /// <summary>
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193 /// Выполняет обещание, сообщая об ошибке
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194 /// </summary>
16
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195 /// <remarks>
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196 /// Поскольку обещание должно работать в многопточной среде, при его выполнении сразу несколько потоков
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197 /// могу вернуть ошибку, при этом только первая будет использована в качестве результата, остальные
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198 /// будут проигнорированы.
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199 /// </remarks>
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200 /// <param name="error">Исключение возникшее при выполнении операции</param>
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201 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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202 public void Reject(Exception error) {
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203 if (BeginTransit()) {
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204 m_error = error;
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205 CompleteTransit(REJECTED_STATE);
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206 OnStateChanged();
25
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207 } else {
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208 WaitTransition();
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209 if (m_state == SUCCEEDED_STATE)
25
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210 throw new InvalidOperationException("The promise is already resolved");
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211 }
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212 }
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213
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214 /// <summary>
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215 /// Отменяет операцию, если это возможно.
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216 /// </summary>
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217 /// <remarks>Для определения была ли операция отменена следует использовать свойство <see cref="IsCancelled"/>.</remarks>
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218 public void Cancel() {
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219 if (m_cancellable && BeginTransit()) {
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220 CompleteTransit(CANCELLED_STATE);
33
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parents: 32
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221 OnStateChanged();
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parents: 32
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222 }
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223 }
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224
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225 public IPromise<T> Then(ResultHandler<T> success, ErrorHandler<T> error, Action cancel) {
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226 if (success == null && error == null && cancel == null)
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227 return this;
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228
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229 var medium = new Promise<T>(this, true);
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230
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231 AddHandler(success, error, cancel, medium);
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232
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233 return medium;
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234 }
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235
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236 /// <summary>
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237 /// Adds new handlers to this promise.
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238 /// </summary>
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239 /// <param name="success">The handler of the successfully completed operation.
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240 /// This handler will recieve an operation result as a parameter.</param>
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241 /// <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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242 /// <returns>The new promise chained to this one.</returns>
26
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243 public IPromise<T> Then(ResultHandler<T> success, ErrorHandler<T> error) {
11
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244 if (success == null && error == null)
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245 return this;
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246
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247 var medium = new Promise<T>(this, true);
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248
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249 AddHandler(success, error, null, medium);
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250
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251 return medium;
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parents: 10
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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
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257 public IPromise<T> Then(ResultHandler<T> success) {
11
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258 if (success == null)
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259 return this;
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260
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261 var medium = new Promise<T>(this, true);
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262
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263 AddHandler(success, null, null, medium);
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264
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265 return medium;
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266 }
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267
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268 /// <summary>
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269 /// Последний обработчик в цепочки обещаний.
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270 /// </summary>
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271 /// <param name="success"></param>
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272 /// <param name="error"></param>
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273 /// <param name="cancel"></param>
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274 /// <remarks>
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275 /// <para>
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276 /// Данный метод не создает связанного с текущим обещания и предназначен для окончания
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277 /// фсинхронной цепочки.
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278 /// </para>
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279 /// <para>
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280 /// Если данный метод вызвать несколько раз, либо добавить другие обработчики, то цепочка
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281 /// не будет одиночной <see cref="IsExclusive"/> и, как следствие, будет невозможна отмена
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282 /// всей цепи обещаний снизу (с самого последнего обещания).
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283 /// </para>
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284 /// </remarks>
75
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285 public void Last(ResultHandler<T> success, ErrorHandler error, Action cancel) {
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286 if (success == null && error == null && cancel == null)
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287 return;
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288
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289 ErrorHandler<T> errorHandler = null;
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290 if (error != null)
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291 errorHandler = err => {
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parents: 74
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292 error(err);
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293 return default(T);
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parents: 74
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294 };
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295 AddHandler(success, errorHandler, cancel, null);
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296 }
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297
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298 public void Last(ResultHandler<T> success, ErrorHandler error) {
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299 Last(success, error, null);
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300 }
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301
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302 public void Last(ResultHandler<T> success) {
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303 Last(success, null, null);
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304 }
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305
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306 public IPromise Error(ErrorHandler error) {
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307 if (error == null)
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308 return this;
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309
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310 var medium = new Promise<T>(this, true);
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311
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312 AddHandler(
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313 null,
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314 e => {
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315 error(e);
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316 return default(T);
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317 },
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318 null,
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319 medium
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320 );
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321
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322 return medium;
6
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parents: 2
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323 }
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324
11
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325 /// <summary>
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326 /// Handles error and allows to keep the promise.
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327 /// </summary>
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328 /// <remarks>
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329 /// If the specified handler throws an exception, this exception will be used to reject the promise.
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330 /// </remarks>
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331 /// <param name="handler">The error handler which returns the result of the promise.</param>
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332 /// <returns>New promise.</returns>
26
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333 public IPromise<T> Error(ErrorHandler<T> handler) {
11
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334 if (handler == null)
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335 return this;
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336
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337 var medium = new Promise<T>(this, true);
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338
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339 AddHandler(null, handler, null, medium);
11
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340
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341 return medium;
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342 }
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343
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344 /// <summary>
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345 /// Позволяет преобразовать результат выполения операции к новому типу.
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346 /// </summary>
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347 /// <typeparam name="TNew">Новый тип результата.</typeparam>
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348 /// <param name="mapper">Преобразование результата к новому типу.</param>
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349 /// <param name="error">Обработчик ошибки. Данный обработчик получит
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350 /// исключение возникшее при выполнении операции.</param>
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351 /// <returns>Новое обещание, которое будет выполнено при выполнении исходного обещания.</returns>
76
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352 public IPromise<TNew> Then<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler<TNew> error, Action cancel) {
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353 Safe.ArgumentNotNull(mapper, "mapper");
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354
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355 // создаем прицепленное обещание
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356 var medium = new Promise<TNew>(this, true);
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357
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358 ResultHandler<T> resultHandler = result => medium.Resolve(mapper(result));
72
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359 ErrorHandler<T> errorHandler;
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360 if (error != null)
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361 errorHandler = e => {
19
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362 try {
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363 medium.Resolve(error(e));
72
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364 } catch (Exception e2) {
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365 // в случае ошибки нужно передать исключение дальше по цепочке
76
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366 medium.Reject(e2);
72
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367 }
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368 return default(T);
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369 };
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370 else
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371 errorHandler = e => {
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372 medium.Reject(e);
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
373 return default(T);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
374 };
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
375
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
376 Action cancelHandler;
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
377 if (cancel != null)
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
378 cancelHandler = () => {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
379 cancel();
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
380 medium.Cancel();
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
381 };
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
382 else
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
383 cancelHandler = medium.Cancel;
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
384
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
385
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
386 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
387 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
388 errorHandler,
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
389 cancelHandler,
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
390 null
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
391 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
392
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
393 return medium;
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
394 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
395
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
396 public IPromise<TNew> Then<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler<TNew> error) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
397 return Then(mapper, error, null);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
398 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
399
75
4439140706d0 major refactoring, added tasks support
cin
parents: 74
diff changeset
400 public IPromise<TNew> Then<TNew>(ResultMapper<T, TNew> mapper) {
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
401 return Then(mapper, null, null);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
402 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
403
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
404 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
405 /// 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
406 /// 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
407 /// новой операции.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
408 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
409 /// <typeparam name="TNew">Тип результата указанной асинхронной операции.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
410 /// <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
411 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
412 /// исключение возникшее при выполнении текуещй операции.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
413 /// <returns>Новое обещание, которое будет выполнено по окончанию указанной аснхронной операции.</returns>
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
414 public IPromise<TNew> Chain<TNew>(ResultMapper<T, IPromise<TNew>> chained, ErrorHandler<IPromise<TNew>> error, Action cancel) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
415
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
416 Safe.ArgumentNotNull(chained, "chained");
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
417
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
418 // 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
419 // создать посредника, к которому будут подвызяваться следующие обработчики.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
420 // 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
421 // передать через него результаты работы.
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
422 var medium = new Promise<TNew>(this, true);
2
aa367305156b small fixes
cin
parents: 1
diff changeset
423
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
424 ResultHandler<T> resultHandler = delegate(T result) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
425 if (medium.IsCancelled)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
426 return;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
427
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
428 var promise = chained(result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
429
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
430 promise.Last(
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
431 medium.Resolve,
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
432 medium.Reject,
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
433 () => medium.Reject(new OperationCanceledException()) // внешняя отмена связанной операции рассматривается как ошибка
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
434 );
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
435
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
436 // 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
437 // 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
438 // зависит IsExclusive
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
439 medium.Cancelled(() => {
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
440 if (promise.IsExclusive)
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
441 promise.Cancel();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
442 });
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
443 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
444
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
445 ErrorHandler<T> errorHandler;
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
446
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
447 if (error != null)
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
448 errorHandler = delegate(Exception e) {
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
449 try {
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
450 var promise = error(e);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
451
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
452 promise.Last(
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
453 medium.Resolve,
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
454 medium.Reject,
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
455 () => medium.Reject(new OperationCanceledException()) // внешняя отмена связанной операции рассматривается как ошибка
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
456 );
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
457
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
458 // notify chained operation that it's not needed anymore
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
459 // порядок вызова Then, Cancelled важен, поскольку от этого
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
460 // зависит IsExclusive
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
461 medium.Cancelled(() => {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
462 if (promise.IsExclusive)
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
463 promise.Cancel();
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
464 });
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
465 } catch (Exception e2) {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
466 medium.Reject(e2);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
467 }
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
468 return default(T);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
469 };
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
470 else
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
471 errorHandler = err => {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
472 medium.Reject(err);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
473 return default(T);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
474 };
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
475
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
476
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
477 Action cancelHandler;
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
478 if (cancel != null)
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
479 cancelHandler = () => {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
480 if (cancel != null)
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
481 cancel();
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
482 medium.Cancel();
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
483 };
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
484 else
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
485 cancelHandler = medium.Cancel;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
486
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
487 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
488 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
489 errorHandler,
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
490 cancelHandler,
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
491 null
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
492 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
493
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
494 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
495 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
496
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
497 public IPromise<TNew> Chain<TNew>(ResultMapper<T, IPromise<TNew>> chained, ErrorHandler<IPromise<TNew>> error) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
498 return Chain(chained, error, null);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
499 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
500
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
501 public IPromise<TNew> Chain<TNew>(ResultMapper<T, IPromise<TNew>> chained) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
502 return Chain(chained, null, null);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
503 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
504
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
505 public IPromise<T> Cancelled(Action handler) {
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
506 var medium = new Promise<T>(this,true);
74
c4140283575c minor fixes
cin
parents: 72
diff changeset
507 AddHandler(null, null, handler, medium);
c4140283575c minor fixes
cin
parents: 72
diff changeset
508 return medium;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
509 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
510
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
511 /// <summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
512 /// Adds the specified handler for all cases (success, error, cancel)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
513 /// </summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
514 /// <param name="handler">The handler that will be called anyway</param>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
515 /// <returns>self</returns>
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
516 public IPromise<T> Anyway(Action handler) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
517 Safe.ArgumentNotNull(handler, "handler");
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
518
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
519 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
520 x => handler(),
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
521 e => {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
522 handler();
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
523 throw new TransientPromiseException(e);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
524 },
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
525 handler,
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
526 null
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
527 );
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
528 return this;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
529 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
530
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
531 /// <summary>
29
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
532 /// Преобразует результат обещания к нужному типу
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
533 /// </summary>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
534 /// <typeparam name="T2"></typeparam>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
535 /// <returns></returns>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
536 public IPromise<T2> Cast<T2>() {
75
4439140706d0 major refactoring, added tasks support
cin
parents: 74
diff changeset
537 return Then(x => (T2)(object)x, null);
29
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
538 }
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
539
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
540 /// <summary>
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
541 /// Дожидается отложенного обещания и в случае успеха, возвращает
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
542 /// его, результат, в противном случае бросает исключение.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
543 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
544 /// <remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
545 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
546 /// 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
547 /// 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
548 /// означает, что мы его не дождались, однако все зарегистрированные
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
549 /// 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
550 /// обещание будет выполнено.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
551 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
552 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
553 /// Такое поведение вполне оправдано поскольку таймаут может истечь
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
554 /// в тот момент, когда началась обработка цепочки обработчиков, и
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
555 /// 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
556 /// отклонение может привести к непрогнозируемому результату.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
557 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
558 /// </remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
559 /// <param name="timeout">Время ожидания</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
560 /// <returns>Результат выполнения обещания</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
561 public T Join(int timeout) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
562 var evt = new ManualResetEvent(false);
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
563 Anyway(() => evt.Set());
2
aa367305156b small fixes
cin
parents: 1
diff changeset
564
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
565 if (!evt.WaitOne(timeout, true))
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
566 throw new TimeoutException();
2
aa367305156b small fixes
cin
parents: 1
diff changeset
567
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
568 switch (m_state) {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
569 case SUCCEEDED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
570 return m_result;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
571 case CANCELLED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
572 throw new OperationCanceledException();
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
573 case REJECTED_STATE:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
574 throw new TargetInvocationException(m_error);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
575 default:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
576 throw new ApplicationException(String.Format("Invalid promise state {0}", m_state));
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
577 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
578 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
579
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
580 public T Join() {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
581 return Join(Timeout.Infinite);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
582 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
583
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
584 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
585 if (success != null || error != null)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
586 Interlocked.Increment(ref m_childrenCount);
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
587
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
588 var handler = new HandlerDescriptor {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
589 resultHandler = success,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
590 errorHandler = error,
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
591 cancellHandler = cancel,
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
592 medium = medium
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
593 };
2
aa367305156b small fixes
cin
parents: 1
diff changeset
594
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
595 bool queued;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
596
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
597 if (!IsResolved) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
598 m_handlers.Enqueue(handler);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
599 queued = true;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
600 } else {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
601 // 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
602 queued = false;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
603 InvokeHandler(handler);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
604 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
605
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
606 if (queued && IsResolved && m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
607 // 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
608 // 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
609 // therefore we will fetch a handler from the queue and execute it
27
cin
parents: 26
diff changeset
610 // note that fetched handler may be not the one that we have added
cin
parents: 26
diff changeset
611 // even we can fetch no handlers at all :)
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
612 InvokeHandler(handler);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
613 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
614
27
cin
parents: 26
diff changeset
615 protected virtual void InvokeHandler(HandlerDescriptor handler) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
616 switch (m_state) {
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
617 case SUCCEEDED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
618 handler.Resolve(m_result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
619 break;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
620 case REJECTED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
621 handler.Reject(m_error);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
622 break;
71
1714fd8678ef code cleanup
cin
parents: 66
diff changeset
623 case CANCELLED_STATE:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
624 handler.Cancel();
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
625 break;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
626 default:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
627 // do nothing
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
628 return;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
629 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
630 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
631
65
653c4e04968b minor changes
cin
parents: 33
diff changeset
632 void OnStateChanged() {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
633 HandlerDescriptor handler;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
634 while (m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
635 InvokeHandler(handler);
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
636 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
637
9
cin
parents: 7
diff changeset
638 public bool IsExclusive {
cin
parents: 7
diff changeset
639 get {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
640 return m_childrenCount <= 1;
9
cin
parents: 7
diff changeset
641 }
cin
parents: 7
diff changeset
642 }
cin
parents: 7
diff changeset
643
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
644 /// <summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
645 /// Объединяет несколько обещаний в одно, результатом которого является массив результатов других обещаний.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
646 /// Если хотябы одно из переданных обещаний не будет выполнено, то новое обещение тоже не будет выполнено.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
647 /// При отмене нового обещания, переданные обещания также будут отменены, если никто больше на них не подписан.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
648 /// </summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
649 /// <param name="promises">Список обещаний. Если список пустой, то результирующее обещание возвращается уже выполненным.</param>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
650 /// <returns>Обещание объединяющее в себе результат переданных обещаний.</returns>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
651 /// <exception cref="ArgumentNullException"><paramref name="promises"/> не может быть null</exception>
30
2fad2d1f4b03 small refactoring, cleanup.
cin
parents: 29
diff changeset
652 public static IPromise<T[]> CreateComposite(IList<IPromise<T>> promises) {
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
653 if (promises == null)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
654 throw new ArgumentNullException();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
655
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
656 // создаем аккумулятор для результатов и результирующее обещание
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
657 var result = new T[promises.Count];
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
658 var promise = new Promise<T[]>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
659
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
660 // special case
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
661 if (promises.Count == 0) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
662 promise.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
663 return promise;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
664 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
665
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
666 int pending = promises.Count;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
667
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
668 for (int i = 0; i < promises.Count; i++) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
669 var dest = i;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
670
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
671 if (promises[i] != null) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
672 promises[i].Then(
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
673 x => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
674 result[dest] = x;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
675 if (Interlocked.Decrement(ref pending) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
676 promise.Resolve(result);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
677 },
72
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
678 e => {
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
679 promise.Reject(e);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
680 return default(T);
d67b95eddaf4 promises refactoring
cin
parents: 71
diff changeset
681 }
33
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 } else {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
684 if (Interlocked.Decrement(ref pending) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
685 promise.Resolve(result);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
686 }
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
687 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
688
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
689 promise.Cancelled(
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
690 () => {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
691 foreach (var d in promises)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
692 if (d != null && d.IsExclusive)
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
693 d.Cancel();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
694 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
695 );
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
696
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
697 return promise;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
698 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
699
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
700 /// <summary>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
701 /// 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
702 /// 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
703 /// игнорируются.
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
704 /// </summary>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
705 /// <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
706 /// <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
707 /// <remarks>
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
708 /// 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
709 /// </remarks>
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
710 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
711 if (promises == null)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
712 throw new ArgumentNullException();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
713 if (promises.Count == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
714 return Promise<object>.ResultToPromise(null);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
715
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
716 int countdown = promises.Count;
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 var result = new Promise<object>();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
719
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
720 foreach (var d in promises) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
721 if (d == null) {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
722 if (Interlocked.Decrement(ref countdown) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
723 result.Resolve(null);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
724 } else {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
725 d.Then(() => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
726 if (Interlocked.Decrement(ref countdown) == 0)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
727 result.Resolve(null);
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 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
731
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
732 result.Cancelled(() => {
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
733 foreach (var d in promises)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
734 if (d != null && d.IsExclusive)
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
735 d.Cancel();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
736 });
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
737
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
738 return result;
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
739 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
740
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
741 public static Promise<T> ResultToPromise(T result) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
742 var p = new Promise<T>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
743 p.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
744 return p;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
745 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
746
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
747 public static Promise<T> ExceptionToPromise(Exception error) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
748 if (error == null)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
749 throw new ArgumentNullException();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
750
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
751 var p = new Promise<T>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
752 p.Reject(error);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
753 return p;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
754 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
755
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
756 #region IPromiseBase explicit implementation
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
757
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
758 IPromise IPromise.Then(Action success, ErrorHandler error, Action cancel) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
759 return Then(
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
760 x => success(),
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
761 e => {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
762 error(e);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
763 return default(T);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
764 },
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
765 cancel
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
766 );
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
767 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
768
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
769 IPromise IPromise.Then(Action success, ErrorHandler error) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
770 return Then(
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
771 x => success(),
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
772 e => {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
773 error(e);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
774 return default(T);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
775 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
776 );
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
777 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
778
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
779 IPromise IPromise.Then(Action success) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
780 return Then(x => success());
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
781 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
782
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
783 void IPromise.Last(Action success, ErrorHandler error, Action cancel) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
784 Last(x => success(), error, cancel);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
785 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
786
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
787 void IPromise.Last(Action success, ErrorHandler error) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
788 Last(x => success(), error, null);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
789 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
790
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
791 void IPromise.Last(Action success) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
792 Last(x => success(), null, null);
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
793 }
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
794
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
795 IPromise IPromise.Error(ErrorHandler error) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
796 return Error(error);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
797 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
798
76
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
799 IPromise IPromise.Anyway(Action handler) {
c761fc982e1d Refactoring of the IPromise<T> interface
cin
parents: 75
diff changeset
800 return Anyway(handler);
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
801 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
802
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
803 IPromise IPromise.Cancelled(Action handler) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
804 return Cancelled(handler);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
805 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
806
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
807 void IPromise.Join() {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
808 Join();
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
809 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
810
66
790e8a997d30 Refactoring
cin
parents: 65
diff changeset
811 void IPromise.Join(int timeout) {
33
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
812 Join(timeout);
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
813 }
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
814
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
815 #endregion
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
816
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
817
b255e4aeef17 removed the reference to the parent from the promise object this allows
cin
parents: 32
diff changeset
818
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
819 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
820 }