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annotate Implab/Promise.cs @ 19:e3935fdf59a2 promises

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Promise is rewritten to use interlocked operations instead of locks
author cin
date Sun, 10 Nov 2013 00:21:33 +0400
parents 5a4b735ba669
children 9bf5b23650c9
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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 {
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51
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52 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 ResolvedState = 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 IPromise 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(IPromise 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 public bool IsResolved {
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123 get {
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124 return m_state > 1;
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125 }
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126 }
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127
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128 public bool IsCancelled {
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129 get {
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130 return m_state == CancelledState;
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131 }
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132 }
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133
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134 /// <summary>
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135 /// Выполняет обещание, сообщая об успешном выполнении.
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136 /// </summary>
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137 /// <param name="result">Результат выполнения.</param>
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138 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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139 public void Resolve(T result) {
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140 if (BeginTransit()) {
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141 m_result = result;
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142 CompleteTransit(ResolvedState);
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143 OnStateChanged();
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144 } else if (m_state != CancelledState)
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145 throw new InvalidOperationException("The promise is already resolved");
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146 }
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147
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148 /// <summary>
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149 /// Выполняет обещание, сообщая об ошибке
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150 /// </summary>
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151 /// <remarks>
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152 /// Поскольку обещание должно работать в многопточной среде, при его выполнении сразу несколько потоков
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153 /// могу вернуть ошибку, при этом только первая будет использована в качестве результата, остальные
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154 /// будут проигнорированы.
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155 /// </remarks>
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156 /// <param name="error">Исключение возникшее при выполнении операции</param>
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157 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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158 public void Reject(Exception error) {
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159 if (BeginTransit()) {
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160 m_error = error;
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161 CompleteTransit(RejectedState);
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162 OnStateChanged();
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163 } else if (m_state == ResolvedState)
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164 throw new InvalidOperationException("The promise is already resolved");
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165 }
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166
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167 /// <summary>
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168 /// Отменяет операцию, если это возможно.
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169 /// </summary>
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170 /// <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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parents: 2
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171 public bool Cancel() {
9
cin
parents: 7
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172 return Cancel(true);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
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173 }
2
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parents: 1
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174
6
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175 /// <summary>
11
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176 /// Adds new handlers to this promise.
6
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177 /// </summary>
11
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178 /// <param name="success">The handler of the successfully completed operation.
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179 /// This handler will recieve an operation result as a parameter.</param>
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180 /// <param name="error">Handles an exception that may occur during the operation.</param>
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181 /// <returns>The new promise chained to this one.</returns>
6
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182 public Promise<T> Then(ResultHandler<T> success, ErrorHandler error) {
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cin
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183 if (success == null && error == null)
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184 return this;
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185
11
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186 var medium = new Promise<T>(this, true);
6
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187
19
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188 ResultHandler<T> resultHandler;
6
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cin
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189 if (success != null)
19
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190 resultHandler = x => {
10
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191 success(x);
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192 medium.Resolve(x);
6
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cin
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193 };
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cin
parents: 2
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194 else
19
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195 resultHandler = medium.Resolve;
2
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parents: 1
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196
19
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197 ErrorHandler errorHandler;
6
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198 if (error != null)
19
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199 errorHandler = x => {
6
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cin
parents: 2
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200 try {
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cin
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201 error(x);
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cin
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diff changeset
202 } catch { }
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cin
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203 medium.Reject(x);
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cin
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204 };
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cin
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205 else
19
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206 errorHandler = medium.Reject;
2
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207
19
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208 AddHandler(resultHandler, errorHandler, medium.InternalCancel);
2
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209
6
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cin
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diff changeset
210 return medium;
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cin
parents: 2
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211 }
2
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parents: 1
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212
11
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213 /// <summary>
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214 /// Adds new handlers to this promise.
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215 /// </summary>
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216 /// <param name="success">The handler of the successfully completed operation.
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217 /// This handler will recieve an operation result as a parameter.</param>
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218 /// <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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219 /// <returns>The new promise chained to this one.</returns>
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220 public Promise<T> Then(ResultHandler<T> success, ErrorHandler<T> error) {
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cin
parents: 10
diff changeset
221 if (success == null && error == null)
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cin
parents: 10
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222 return this;
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cin
parents: 10
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223
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224 var medium = new Promise<T>(this, true);
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parents: 10
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225
19
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226 ResultHandler<T> resultHandler;
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parents: 16
diff changeset
227 ErrorHandler errorHandler;
11
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parents: 10
diff changeset
228
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diff changeset
229 if (success != null)
19
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cin
parents: 16
diff changeset
230 resultHandler = x => {
11
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cin
parents: 10
diff changeset
231 success(x);
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232 medium.Resolve(x);
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parents: 10
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233 };
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parents: 10
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234 else
19
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cin
parents: 16
diff changeset
235 resultHandler = medium.Resolve;
11
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cin
parents: 10
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236
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parents: 10
diff changeset
237 if (error != null)
19
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cin
parents: 16
diff changeset
238 errorHandler = x => {
11
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cin
parents: 10
diff changeset
239 try {
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cin
parents: 10
diff changeset
240 medium.Resolve(error(x));
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cin
parents: 10
diff changeset
241 } catch { }
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cin
parents: 10
diff changeset
242 medium.Reject(x);
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cin
parents: 10
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243 };
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244 else
19
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diff changeset
245 errorHandler = medium.Reject;
11
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parents: 10
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246
19
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diff changeset
247 AddHandler(resultHandler, errorHandler, medium.InternalCancel);
11
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cin
parents: 10
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248
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cin
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249 return medium;
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cin
parents: 10
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250 }
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parents: 10
diff changeset
251
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parents: 10
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252
6
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cin
parents: 2
diff changeset
253 public Promise<T> Then(ResultHandler<T> success) {
11
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cin
parents: 10
diff changeset
254 if (success == null)
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cin
parents: 10
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255 return this;
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cin
parents: 10
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256
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cin
parents: 10
diff changeset
257 var medium = new Promise<T>(this, true);
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parents: 10
diff changeset
258
19
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cin
parents: 16
diff changeset
259 ResultHandler<T> resultHandler;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
260
11
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cin
parents: 10
diff changeset
261 if (success != null)
19
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cin
parents: 16
diff changeset
262 resultHandler = x => {
11
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cin
parents: 10
diff changeset
263 success(x);
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cin
parents: 10
diff changeset
264 medium.Resolve(x);
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cin
parents: 10
diff changeset
265 };
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parents: 10
diff changeset
266 else
19
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cin
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diff changeset
267 resultHandler = medium.Resolve;
11
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268
19
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cin
parents: 16
diff changeset
269 AddHandler(resultHandler, medium.Reject, medium.InternalCancel);
11
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cin
parents: 10
diff changeset
270
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cin
parents: 10
diff changeset
271 return medium;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
272 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
273
6
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cin
parents: 2
diff changeset
274 public Promise<T> Error(ErrorHandler error) {
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cin
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275 return Then(null, error);
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cin
parents: 2
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276 }
2
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parents: 1
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277
11
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parents: 10
diff changeset
278 /// <summary>
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279 /// Handles error and allows to keep the promise.
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diff changeset
280 /// </summary>
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parents: 10
diff changeset
281 /// <remarks>
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diff changeset
282 /// If the specified handler throws an exception, this exception will be used to reject the promise.
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cin
parents: 10
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283 /// </remarks>
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284 /// <param name="handler">The error handler which returns the result of the promise.</param>
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cin
parents: 10
diff changeset
285 /// <returns>New promise.</returns>
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cin
parents: 10
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286 public Promise<T> Error(ErrorHandler<T> handler) {
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cin
parents: 10
diff changeset
287 if (handler == null)
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cin
parents: 10
diff changeset
288 return this;
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cin
parents: 10
diff changeset
289
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cin
parents: 10
diff changeset
290 var medium = new Promise<T>(this, true);
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cin
parents: 10
diff changeset
291
19
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cin
parents: 16
diff changeset
292 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
293 null,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
294 e => {
11
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cin
parents: 10
diff changeset
295 try {
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cin
parents: 10
diff changeset
296 medium.Resolve(handler(e));
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cin
parents: 10
diff changeset
297 } catch (Exception e2) {
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cin
parents: 10
diff changeset
298 medium.Reject(e2);
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cin
parents: 10
diff changeset
299 }
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
300 },
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
301 medium.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
302 );
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
303
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
304 return medium;
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cin
parents: 10
diff changeset
305 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
306
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
307 public Promise<T> Anyway(Action handler) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
308 if (handler == null)
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
309 return this;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
310
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
311 var medium = new Promise<T>();
2
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cin
parents: 1
diff changeset
312
19
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cin
parents: 16
diff changeset
313 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
314 x => {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
315 // 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
316 try {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
317 handler();
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
318 medium.Resolve(x);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
319 } catch (Exception e) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
320 medium.Reject(e);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
321 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
322 },
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
323
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
324 e => {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
325 try {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
326 handler();
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
327 } catch { }
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
328 medium.Reject(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
329 },
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 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
333
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
334 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
335 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
336
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
337 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
338 /// Позволяет преобразовать результат выполения операции к новому типу.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
339 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
340 /// <typeparam name="TNew">Новый тип результата.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
341 /// <param name="mapper">Преобразование результата к новому типу.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
342 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
343 /// исключение возникшее при выполнении операции.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
344 /// <returns>Новое обещание, которое будет выполнено при выполнении исходного обещания.</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
345 public Promise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler error) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
346 if (mapper == null)
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
347 throw new ArgumentNullException("mapper");
2
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cin
parents: 1
diff changeset
348
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
349 // создаем прицепленное обещание
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
350 var chained = new Promise<TNew>();
2
aa367305156b small fixes
cin
parents: 1
diff changeset
351
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
352 ResultHandler<T> resultHandler = result => chained.Resolve(mapper(result));
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
353 ErrorHandler errorHandler = delegate(Exception e) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
354 if (error != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
355 try {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
356 error(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
357 } catch { }
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
358 // 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
359 chained.Reject(e);
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
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
362
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
363 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
364 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
365 errorHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
366 chained.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
367 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
368
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
369 return chained;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
370 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
371
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
372 public Promise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
373 return Map(mapper, null);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
374 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
375
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
376 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
377 /// 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
378 /// 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
379 /// новой операции.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
380 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
381 /// <typeparam name="TNew">Тип результата указанной асинхронной операции.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
382 /// <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
383 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
384 /// исключение возникшее при выполнении текуещй операции.</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
385 /// <returns>Новое обещание, которое будет выполнено по окончанию указанной аснхронной операции.</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
386 public Promise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained, ErrorHandler error) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
387
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
388 // 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
389 // создать посредника, к которому будут подвызяваться следующие обработчики.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
390 // 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
391 // передать через него результаты работы.
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
392 var medium = new Promise<TNew>(this, true);
2
aa367305156b small fixes
cin
parents: 1
diff changeset
393
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
394 ResultHandler<T> resultHandler = delegate(T result) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
395 if (medium.IsCancelled)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
396 return;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
397
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
398 var promise = chained(result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
399
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
400 // notify chained operation that it's not needed
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
401 medium.Cancelled(() => promise.Cancel());
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
402 promise.Then(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
403 x => medium.Resolve(x),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
404 e => medium.Reject(e)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
405 );
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
406 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
407
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
408 ErrorHandler errorHandler = delegate(Exception e) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
409 if (error != null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
410 error(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
411 // 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
412 medium.Reject(e);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
413 };
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
414
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
415 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
416 resultHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
417 errorHandler,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
418 medium.InternalCancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
419 );
2
aa367305156b small fixes
cin
parents: 1
diff changeset
420
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
421 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
422 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
423
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
424 public Promise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
425 return Chain(chained, null);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
426 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
427
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
428 public Promise<T> Cancelled(Action handler) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
429 AddHandler(null, null, handler);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
430 return this;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
431 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
432
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
433 public Promise<T> Finally(Action handler) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
434 if (handler == null)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
435 throw new ArgumentNullException("handler");
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
436 AddHandler(
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
437 x => handler(),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
438 e => handler(),
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
439 handler
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
440 );
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
441 return this;
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
442 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
443
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
444 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
445 /// Дожидается отложенного обещания и в случае успеха, возвращает
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
446 /// его, результат, в противном случае бросает исключение.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
447 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
448 /// <remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
449 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
450 /// 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
451 /// 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
452 /// означает, что мы его не дождались, однако все зарегистрированные
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
453 /// 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
454 /// обещание будет выполнено.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
455 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
456 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
457 /// Такое поведение вполне оправдано поскольку таймаут может истечь
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
458 /// в тот момент, когда началась обработка цепочки обработчиков, и
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
459 /// 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
460 /// отклонение может привести к непрогнозируемому результату.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
461 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
462 /// </remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
463 /// <param name="timeout">Время ожидания</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
464 /// <returns>Результат выполнения обещания</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
465 public T Join(int timeout) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
466 var evt = new ManualResetEvent(false);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
467 Anyway(() => evt.Set());
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
468 Cancelled(() => evt.Set());
2
aa367305156b small fixes
cin
parents: 1
diff changeset
469
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
470 if (!evt.WaitOne(timeout, true))
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
471 throw new TimeoutException();
2
aa367305156b small fixes
cin
parents: 1
diff changeset
472
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
473 switch (m_state) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
474 case ResolvedState:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
475 return m_result;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
476 case CancelledState:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
477 throw new OperationCanceledException();
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
478 case RejectedState:
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
479 throw new TargetInvocationException(m_error);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
480 default:
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
481 throw new ApplicationException(String.Format("Invalid promise state {0}", m_state));
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
482 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
483 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
484
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
485 public T Join() {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
486 return Join(Timeout.Infinite);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
487 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
488
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
489 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
490 Interlocked.Increment(ref m_childrenCount);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
491
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
492 HandlerDescriptor handler = new HandlerDescriptor {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
493 resultHandler = success,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
494 errorHandler = error,
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
495 cancellHandler = cancel
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
496 };
2
aa367305156b small fixes
cin
parents: 1
diff changeset
497
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
498 bool queued;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
499
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
500 if (!IsResolved) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
501 m_handlers.Enqueue(handler);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
502 queued = true;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
503 } else {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
504 // 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
505 queued = false;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
506 InvokeHandler(handler);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
507 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
508
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
509 if (queued && IsResolved && m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
510 // 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
511 // 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
512 // therefore we will fetch a handler from the queue and execute it
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
513 // note that fetched handler may be not the one we have added
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
514 InvokeHandler(handler);
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
515
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
516 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
517
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
518 void InvokeHandler(HandlerDescriptor handler) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
519 switch (m_state) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
520 case ResolvedState:
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
521 handler.Resolve(m_result);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
522 break;
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
523 case RejectedState:
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
524 handler.Reject(m_error);
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
525 break;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
526 case CancelledState:
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
527 handler.Cancel();
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
528 break;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
529 default:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
530 // do nothing
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
531 return;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
532 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
533 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
534
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
535 protected virtual void OnStateChanged() {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
536 HandlerDescriptor handler;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
537 while (m_handlers.TryDequeue(out handler))
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
538 InvokeHandler(handler);
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
539 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
540
2
aa367305156b small fixes
cin
parents: 1
diff changeset
541
9
cin
parents: 7
diff changeset
542
cin
parents: 7
diff changeset
543 public bool IsExclusive {
cin
parents: 7
diff changeset
544 get {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
545 return m_childrenCount <= 1;
9
cin
parents: 7
diff changeset
546 }
cin
parents: 7
diff changeset
547 }
cin
parents: 7
diff changeset
548
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
549 protected bool Cancel(bool dependencies) {
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
550 if (BeginTransit()) {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
551 CompleteTransit(CancelledState);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
552 OnStateChanged();
9
cin
parents: 7
diff changeset
553
19
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
554 if (dependencies && m_parent != null && m_parent.IsExclusive)
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
555 m_parent.Cancel();
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
556
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
557 return true;
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
558 } else {
e3935fdf59a2 Promise is rewritten to use interlocked operations instead of locks
cin
parents: 16
diff changeset
559 return false;
9
cin
parents: 7
diff changeset
560 }
cin
parents: 7
diff changeset
561 }
15
0f982f9b7d4d implemented parallel map and foreach for arrays
cin
parents: 14
diff changeset
562
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
563 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
564 }