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annotate Implab/Promise.cs @ 29:768f7deeb55b

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Added a casting method for promises.
author cin
date Thu, 06 Mar 2014 17:59:03 +0400
parents 81708975d6f7
children 2fad2d1f4b03
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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 Promise<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 errorHandler;
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55 public Action cancellHandler;
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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 }
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64 }
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65
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66 public void Reject(Exception err) {
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67 if (errorHandler != null)
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68 try {
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69 errorHandler(err);
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70 } catch {
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71 }
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72 }
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73
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74 public void Cancel() {
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75 if (cancellHandler != null)
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76 try {
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77 cancellHandler();
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78 } catch {
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79 }
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80 }
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81 }
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82
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83 const int UnresolvedSate = 0;
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84 const int TransitionalState = 1;
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85 const int SucceededState = 2;
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86 const int RejectedState = 3;
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87 const int CancelledState = 4;
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88
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89 readonly IPromiseBase m_parent;
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90 readonly bool m_cancellable;
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91
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92 int m_childrenCount = 0;
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93 int m_state;
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94 T m_result;
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95 Exception m_error;
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96
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97 readonly MTQueue<HandlerDescriptor> m_handlers = new MTQueue<HandlerDescriptor>();
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98
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99 public Promise() {
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100 m_cancellable = true;
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101 }
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102
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103 public Promise(IPromiseBase parent, bool cancellable) {
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104 m_cancellable = cancellable;
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105 m_parent = parent;
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106 }
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107
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108 void InternalCancel() {
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109 // don't try to cancel parent :)
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110 Cancel(false);
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111 }
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112
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113 bool BeginTransit() {
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114 return UnresolvedSate == Interlocked.CompareExchange(ref m_state, TransitionalState, UnresolvedSate);
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115 }
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116
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117 void CompleteTransit(int state) {
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118 if (TransitionalState != Interlocked.CompareExchange(ref m_state, state, TransitionalState))
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119 throw new InvalidOperationException("Can't complete transition when the object isn't in the transitional state");
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120 }
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121
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122 void WaitTransition() {
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123 while (m_state == TransitionalState) {
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124 /* noop */
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125 }
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126 }
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127
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128 public bool IsResolved {
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129 get {
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130 return m_state > 1;
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131 }
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132 }
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133
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134 public bool IsCancelled {
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135 get {
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136 return m_state == CancelledState;
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137 }
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138 }
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139
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140 public Type PromiseType {
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141 get { return typeof(T); }
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142 }
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143
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144 /// <summary>
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145 /// Выполняет обещание, сообщая об успешном выполнении.
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146 /// </summary>
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147 /// <param name="result">Результат выполнения.</param>
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148 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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149 public void Resolve(T result) {
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150 if (BeginTransit()) {
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151 m_result = result;
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152 CompleteTransit(SucceededState);
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153 OnStateChanged();
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154 } else {
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155 WaitTransition();
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156 if (m_state != CancelledState)
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157 throw new InvalidOperationException("The promise is already resolved");
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158 }
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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 ошибке
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163 /// </summary>
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164 /// <remarks>
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165 /// Поскольку обещание должно работать в многопточной среде, при его выполнении сразу несколько потоков
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166 /// могу вернуть ошибку, при этом только первая будет использована в качестве результата, остальные
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167 /// будут проигнорированы.
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168 /// </remarks>
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169 /// <param name="error">Исключение возникшее при выполнении операции</param>
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170 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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171 public void Reject(Exception error) {
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172 if (BeginTransit()) {
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173 m_error = error;
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174 CompleteTransit(RejectedState);
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175 OnStateChanged();
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176 } else {
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177 WaitTransition();
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parents: 19
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178 if (m_state == SucceededState)
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parents: 19
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179 throw new InvalidOperationException("The promise is already resolved");
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parents: 19
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180 }
6
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parents: 2
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181 }
2
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parents: 1
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182
6
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183 /// <summary>
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184 /// Отменяет операцию, если это возможно.
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185 /// </summary>
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186 /// <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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cin
parents: 2
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187 public bool Cancel() {
9
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parents: 7
diff changeset
188 return Cancel(true);
6
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cin
parents: 2
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189 }
2
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parents: 1
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190
6
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parents: 2
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191 /// <summary>
11
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192 /// Adds new handlers to this promise.
6
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193 /// </summary>
11
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194 /// <param name="success">The handler of the successfully completed operation.
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195 /// This handler will recieve an operation result as a parameter.</param>
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196 /// <param name="error">Handles an exception that may occur during the operation.</param>
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197 /// <returns>The new promise chained to this one.</returns>
26
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198 public IPromise<T> Then(ResultHandler<T> success, ErrorHandler error) {
6
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199 if (success == null && error == null)
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200 return this;
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201
11
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diff changeset
202 var medium = new Promise<T>(this, true);
6
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parents: 2
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203
19
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204 ResultHandler<T> resultHandler;
6
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parents: 2
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205 if (success != null)
19
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parents: 16
diff changeset
206 resultHandler = x => {
10
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parents: 9
diff changeset
207 success(x);
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208 medium.Resolve(x);
6
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cin
parents: 2
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209 };
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cin
parents: 2
diff changeset
210 else
19
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parents: 16
diff changeset
211 resultHandler = medium.Resolve;
2
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parents: 1
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212
19
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parents: 16
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213 ErrorHandler errorHandler;
6
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cin
parents: 2
diff changeset
214 if (error != null)
19
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parents: 16
diff changeset
215 errorHandler = x => {
25
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parents: 19
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216 // несмотря на то, что обработчик ошибки вызывается безопасно,
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217 // т.е. возникшие в нем ошибки будут подавлены, нам нужно
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218 // гарантировать, что ошибка будет передана дальше по цепочке обещаний
6
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parents: 2
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219 try {
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parents: 2
diff changeset
220 error(x);
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cin
parents: 2
diff changeset
221 } catch { }
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cin
parents: 2
diff changeset
222 medium.Reject(x);
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cin
parents: 2
diff changeset
223 };
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cin
parents: 2
diff changeset
224 else
19
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parents: 16
diff changeset
225 errorHandler = medium.Reject;
2
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parents: 1
diff changeset
226
19
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parents: 16
diff changeset
227 AddHandler(resultHandler, errorHandler, medium.InternalCancel);
2
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parents: 1
diff changeset
228
6
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parents: 2
diff changeset
229 return medium;
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cin
parents: 2
diff changeset
230 }
2
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parents: 1
diff changeset
231
26
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parents: 25
diff changeset
232 public IPromiseBase Then(Action success,ErrorHandler error)
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parents: 25
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233 {
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parents: 25
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234 return Then(x => success(), error);
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parents: 25
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235 }
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parents: 25
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236
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parents: 25
diff changeset
237 public IPromiseBase Then(Action success)
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parents: 25
diff changeset
238 {
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parents: 25
diff changeset
239 return Then(success);
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parents: 25
diff changeset
240 }
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parents: 25
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241
11
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parents: 10
diff changeset
242 /// <summary>
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243 /// Adds new handlers to this promise.
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parents: 10
diff changeset
244 /// </summary>
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parents: 10
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245 /// <param name="success">The handler of the successfully completed operation.
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parents: 10
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246 /// This handler will recieve an operation result as a parameter.</param>
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parents: 10
diff changeset
247 /// <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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248 /// <returns>The new promise chained to this one.</returns>
26
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parents: 25
diff changeset
249 public IPromise<T> Then(ResultHandler<T> success, ErrorHandler<T> error) {
11
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parents: 10
diff changeset
250 if (success == null && error == null)
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parents: 10
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251 return this;
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parents: 10
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252
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parents: 10
diff changeset
253 var medium = new Promise<T>(this, true);
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parents: 10
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254
19
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parents: 16
diff changeset
255 ResultHandler<T> resultHandler;
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parents: 16
diff changeset
256 ErrorHandler errorHandler;
11
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parents: 10
diff changeset
257
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parents: 10
diff changeset
258 if (success != null)
19
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cin
parents: 16
diff changeset
259 resultHandler = x => {
11
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parents: 10
diff changeset
260 success(x);
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parents: 10
diff changeset
261 medium.Resolve(x);
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parents: 10
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262 };
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parents: 10
diff changeset
263 else
19
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cin
parents: 16
diff changeset
264 resultHandler = medium.Resolve;
11
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parents: 10
diff changeset
265
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parents: 10
diff changeset
266 if (error != null)
19
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cin
parents: 16
diff changeset
267 errorHandler = x => {
11
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parents: 10
diff changeset
268 try {
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parents: 10
diff changeset
269 medium.Resolve(error(x));
25
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cin
parents: 19
diff changeset
270 } catch(Exception e) {
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parents: 19
diff changeset
271 medium.Reject(e);
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parents: 19
diff changeset
272 }
11
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parents: 10
diff changeset
273 };
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parents: 10
diff changeset
274 else
19
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cin
parents: 16
diff changeset
275 errorHandler = medium.Reject;
11
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parents: 10
diff changeset
276
19
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parents: 16
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277 AddHandler(resultHandler, errorHandler, medium.InternalCancel);
11
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parents: 10
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278
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parents: 10
diff changeset
279 return medium;
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parents: 10
diff changeset
280 }
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parents: 10
diff changeset
281
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parents: 10
diff changeset
282
26
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parents: 25
diff changeset
283 public IPromise<T> Then(ResultHandler<T> success) {
11
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cin
parents: 10
diff changeset
284 if (success == null)
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cin
parents: 10
diff changeset
285 return this;
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parents: 10
diff changeset
286
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parents: 10
diff changeset
287 var medium = new Promise<T>(this, true);
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parents: 10
diff changeset
288
19
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parents: 16
diff changeset
289 ResultHandler<T> resultHandler;
25
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parents: 19
diff changeset
290
11
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parents: 10
diff changeset
291 if (success != null)
19
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cin
parents: 16
diff changeset
292 resultHandler = x => {
11
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cin
parents: 10
diff changeset
293 success(x);
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cin
parents: 10
diff changeset
294 medium.Resolve(x);
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cin
parents: 10
diff changeset
295 };
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cin
parents: 10
diff changeset
296 else
19
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cin
parents: 16
diff changeset
297 resultHandler = medium.Resolve;
11
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parents: 10
diff changeset
298
19
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parents: 16
diff changeset
299 AddHandler(resultHandler, medium.Reject, medium.InternalCancel);
11
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cin
parents: 10
diff changeset
300
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parents: 10
diff changeset
301 return medium;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
302 }
2
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cin
parents: 1
diff changeset
303
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
304 public IPromise<T> Error(ErrorHandler error) {
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
305 return Then((ResultHandler<T>)null, error);
6
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cin
parents: 2
diff changeset
306 }
2
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parents: 1
diff changeset
307
11
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cin
parents: 10
diff changeset
308 /// <summary>
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parents: 10
diff changeset
309 /// Handles error and allows to keep the promise.
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cin
parents: 10
diff changeset
310 /// </summary>
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cin
parents: 10
diff changeset
311 /// <remarks>
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parents: 10
diff changeset
312 /// If the specified handler throws an exception, this exception will be used to reject the promise.
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
313 /// </remarks>
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cin
parents: 10
diff changeset
314 /// <param name="handler">The error handler which returns the result of the promise.</param>
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cin
parents: 10
diff changeset
315 /// <returns>New promise.</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
316 public IPromise<T> Error(ErrorHandler<T> handler) {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
317 if (handler == null)
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cin
parents: 10
diff changeset
318 return this;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
319
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cin
parents: 10
diff changeset
320 var medium = new Promise<T>(this, true);
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cin
parents: 10
diff changeset
321
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
322 AddHandler(
27
cin
parents: 26
diff changeset
323 x => medium.Resolve(x),
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
324 e => {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
325 try {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
326 medium.Resolve(handler(e));
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
327 } catch (Exception e2) {
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cin
parents: 10
diff changeset
328 medium.Reject(e2);
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cin
parents: 10
diff changeset
329 }
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
330 },
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
331 medium.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
332 );
11
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cin
parents: 10
diff changeset
333
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
334 return medium;
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cin
parents: 10
diff changeset
335 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
336
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
337 public IPromise<T> Anyway(Action handler) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
338 if (handler == null)
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cin
parents: 2
diff changeset
339 return this;
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cin
parents: 2
diff changeset
340
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
341 var medium = new Promise<T>();
2
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cin
parents: 1
diff changeset
342
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
343 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
344 x => {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
345 // to avoid handler being called multiple times we handle exception by ourselfs
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
346 try {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
347 handler();
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
348 medium.Resolve(x);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
349 } catch (Exception e) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
350 medium.Reject(e);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
351 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
352 },
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
353
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
354 e => {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
355 try {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
356 handler();
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
357 } catch { }
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
358 medium.Reject(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
359 },
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
360
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
361 medium.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
362 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
363
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
364 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
365 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
366
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
367 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
368 /// Позволяет преобразовать результат выполения операции к новому типу.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
369 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
370 /// <typeparam name="TNew">Новый тип результата.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
371 /// <param name="mapper">Преобразование результата к новому типу.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
372 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
373 /// исключение возникшее при выполнении операции.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
374 /// <returns>Новое обещание, которое будет выполнено при выполнении исходного обещания.</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
375 public IPromise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler error) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
376 if (mapper == null)
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
377 throw new ArgumentNullException("mapper");
2
aa367305156b small fixes
cin
parents: 1
diff changeset
378
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
379 // создаем прицепленное обещание
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
380 var chained = new Promise<TNew>();
2
aa367305156b small fixes
cin
parents: 1
diff changeset
381
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
382 ResultHandler<T> resultHandler = result => chained.Resolve(mapper(result));
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
383 ErrorHandler errorHandler = delegate(Exception e) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
384 if (error != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
385 try {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
386 error(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
387 } catch { }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
388 // 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
389 chained.Reject(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
390 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
391
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
392
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
393 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
394 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
395 errorHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
396 chained.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
397 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
398
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
399 return chained;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
400 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
401
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
402 public IPromise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper) {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
403 return Map(mapper, null);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
404 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
405
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
406 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
407 /// 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
408 /// 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
409 /// новой операции.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
410 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
411 /// <typeparam name="TNew">Тип результата указанной асинхронной операции.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
412 /// <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
413 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
414 /// исключение возникшее при выполнении текуещй операции.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
415 /// <returns>Новое обещание, которое будет выполнено по окончанию указанной аснхронной операции.</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
416 public IPromise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained, ErrorHandler error) {
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
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
430 // notify chained operation that it's not needed
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
431 medium.Cancelled(() => promise.Cancel());
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
432 promise.Then(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
433 x => medium.Resolve(x),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
434 e => medium.Reject(e)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
435 );
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
436 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
437
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
438 ErrorHandler errorHandler = delegate(Exception e) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
439 if (error != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
440 error(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
441 // 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
442 medium.Reject(e);
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
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
445 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
446 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
447 errorHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
448 medium.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
449 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
450
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
451 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
452 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
453
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
454 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
455 return Chain(chained, null);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
456 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
457
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
458 public IPromise<T> Cancelled(Action handler) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
459 AddHandler(null, null, handler);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
460 return this;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
461 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
462
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
463 /// <summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
464 /// Adds the specified handler for all cases (success, error, cancel)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
465 /// </summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
466 /// <param name="handler">The handler that will be called anyway</param>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
467 /// <returns>self</returns>
26
f0bf98e4d22c refactoring
cin
parents: 25
diff changeset
468 public IPromise<T> Finally(Action handler) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
469 if (handler == null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
470 throw new ArgumentNullException("handler");
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
471 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
472 x => handler(),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
473 e => handler(),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
474 handler
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
475 );
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
476 return this;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
477 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
478
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
479 /// <summary>
29
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
480 /// Преобразует результат обещания к нужному типу
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
481 /// </summary>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
482 /// <typeparam name="T2"></typeparam>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
483 /// <returns></returns>
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
484 public IPromise<T2> Cast<T2>() {
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
485 return Map(x => (T2)(object)x, null);
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
486 }
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
487
768f7deeb55b Added a casting method for promises.
cin
parents: 28
diff changeset
488 /// <summary>
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
489 /// Дожидается отложенного обещания и в случае успеха, возвращает
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
490 /// его, результат, в противном случае бросает исключение.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
491 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
492 /// <remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
493 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
494 /// 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
495 /// 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
496 /// означает, что мы его не дождались, однако все зарегистрированные
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
497 /// 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
498 /// обещание будет выполнено.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
499 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
500 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
501 /// Такое поведение вполне оправдано поскольку таймаут может истечь
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
502 /// в тот момент, когда началась обработка цепочки обработчиков, и
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
503 /// 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
504 /// отклонение может привести к непрогнозируемому результату.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
505 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
506 /// </remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
507 /// <param name="timeout">Время ожидания</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
508 /// <returns>Результат выполнения обещания</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
509 public T Join(int timeout) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
510 var evt = new ManualResetEvent(false);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
511 Anyway(() => evt.Set());
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
512 Cancelled(() => evt.Set());
2
aa367305156b small fixes
cin
parents: 1
diff changeset
513
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
514 if (!evt.WaitOne(timeout, true))
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
515 throw new TimeoutException();
2
aa367305156b small fixes
cin
parents: 1
diff changeset
516
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
517 switch (m_state) {
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
518 case SucceededState:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
519 return m_result;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
520 case CancelledState:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
521 throw new OperationCanceledException();
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
522 case RejectedState:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
523 throw new TargetInvocationException(m_error);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
524 default:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
525 throw new ApplicationException(String.Format("Invalid promise state {0}", m_state));
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
526 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
527 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
528
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
529 public T Join() {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
530 return Join(Timeout.Infinite);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
531 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
532
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
533 void AddHandler(ResultHandler<T> success, ErrorHandler error, Action cancel) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
534 Interlocked.Increment(ref m_childrenCount);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
535
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
536 HandlerDescriptor handler = new HandlerDescriptor {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
537 resultHandler = success,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
538 errorHandler = error,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
539 cancellHandler = cancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
540 };
2
aa367305156b small fixes
cin
parents: 1
diff changeset
541
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
542 bool queued;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
543
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
544 if (!IsResolved) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
545 m_handlers.Enqueue(handler);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
546 queued = true;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
547 } else {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
548 // 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
549 queued = false;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
550 InvokeHandler(handler);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
551 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
552
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
553 if (queued && IsResolved && m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
554 // 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
555 // 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
556 // therefore we will fetch a handler from the queue and execute it
27
cin
parents: 26
diff changeset
557 // note that fetched handler may be not the one that we have added
cin
parents: 26
diff changeset
558 // even we can fetch no handlers at all :)
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
559 InvokeHandler(handler);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
560 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
561
27
cin
parents: 26
diff changeset
562 protected virtual void InvokeHandler(HandlerDescriptor handler) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
563 switch (m_state) {
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
564 case SucceededState:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
565 handler.Resolve(m_result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
566 break;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
567 case RejectedState:
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
568 handler.Reject(m_error);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
569 break;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
570 case CancelledState:
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
571 handler.Cancel();
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
572 break;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
573 default:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
574 // do nothing
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
575 return;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
576 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
577 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
578
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
579 protected virtual void OnStateChanged() {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
580 HandlerDescriptor handler;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
581 while (m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
582 InvokeHandler(handler);
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
583 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
584
9
cin
parents: 7
diff changeset
585 public bool IsExclusive {
cin
parents: 7
diff changeset
586 get {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
587 return m_childrenCount <= 1;
9
cin
parents: 7
diff changeset
588 }
cin
parents: 7
diff changeset
589 }
cin
parents: 7
diff changeset
590
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
591 protected bool Cancel(bool dependencies) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
592 if (BeginTransit()) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
593 CompleteTransit(CancelledState);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
594 OnStateChanged();
9
cin
parents: 7
diff changeset
595
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
596 if (dependencies && m_parent != null && m_parent.IsExclusive)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
597 m_parent.Cancel();
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
598
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
599 return 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 return false;
9
cin
parents: 7
diff changeset
602 }
cin
parents: 7
diff changeset
603 }
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents: 14
diff changeset
604
25
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
605 /// <summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
606 /// Объединяет несколько обещаний в одно, результатом которого является массив результатов других обещаний.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
607 /// Если хотябы одно из переданных обещаний не будет выполнено, то новое обещение тоже не будет выполнено.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
608 /// При отмене нового обещания, переданные обещания также будут отменены, если никто больше на них не подписан.
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
609 /// </summary>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
610 /// <param name="promises">Список обещаний. Если список пустой, то результирующее обещание возвращается уже выполненным.</param>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
611 /// <returns>Обещание объединяющее в себе результат переданных обещаний.</returns>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
612 /// <exception cref="ArgumentNullException"><paramref name="promises"/> не может быть null</exception>
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
613 public static Promise<T[]> CreateComposite(IList<Promise<T>> promises) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
614 if (promises == null)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
615 throw new ArgumentNullException();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
616
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
617 // создаем аккумулятор для результатов и результирующее обещание
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
618 var result = new T[promises.Count];
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
619 var promise = new Promise<T[]>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
620
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
621 // special case
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
622 if (promises.Count == 0) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
623 promise.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
624 return promise;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
625 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
626
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
627 int pending = promises.Count;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
628
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
629 for (int i = 0; i < promises.Count; i++) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
630 var dest = i;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
631
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
632 promises[i].Then(
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
633 x => {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
634 result[dest] = x;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
635 if(Interlocked.Decrement(ref pending) == 0)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
636 promise.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
637 },
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
638 e => promise.Reject(e)
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 promise.Cancelled(
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
643 () => {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
644 foreach(var d in promises)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
645 if(d.IsExclusive)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
646 d.Cancel();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
647 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
648 );
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
649
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
650 return promise;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
651 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
652
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
653 public static Promise<T> ResultToPromise(T result) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
654 var p = new Promise<T>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
655 p.Resolve(result);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
656 return p;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
657 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
658
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
659 public static Promise<T> ExceptionToPromise(Exception error) {
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
660 if (error == null)
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
661 throw new ArgumentNullException();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
662
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
663 var p = new Promise<T>();
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
664 p.Reject(error);
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
665 return p;
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
666 }
9bf5b23650c9 refactoring
cin
parents: 19
diff changeset
667
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
668 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
669 }