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annotate Implab/Promise.cs @ 11:6ec82bf68c8e promises

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refactoring
author cin
date Tue, 05 Nov 2013 01:09:58 +0400
parents aa33d0bb8c0c
children e943453e5039
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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
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7 namespace Implab {
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8
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9 public delegate void ErrorHandler(Exception e);
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10 public delegate T ErrorHandler<out T>(Exception e);
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11 public delegate void ResultHandler<in T>(T result);
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12 public delegate TNew ResultMapper<in TSrc, out TNew>(TSrc result);
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13 public delegate Promise<TNew> ChainedOperation<in TSrc, TNew>(TSrc result);
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14
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15 /// <summary>
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16 /// Класс для асинхронного получения результатов. Так называемое "обещание".
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17 /// </summary>
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18 /// <typeparam name="T">Тип получаемого результата</typeparam>
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19 /// <remarks>
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20 /// <para>Сервис при обращении к его методу дает обещаиние о выполнении операции,
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21 /// клиент получив такое обещание может установить ряд обратных вызово для получения
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22 /// событий выполнения обещания, тоесть завершения операции и предоставлении результатов.</para>
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23 /// <para>
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24 /// Обещение может быть как выполнено, так и выполнено с ошибкой. Для подписки на
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25 /// данные события клиент должен использовать методы <c>Then</c>.
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26 /// </para>
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27 /// <para>
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28 /// Сервис, в свою очередь, по окончанию выполнения операции (возможно с ошибкой),
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29 /// использует методы <c>Resolve</c> либо <c>Reject</c> для оповещения клиетна о
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30 /// выполнении обещания.
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31 /// </para>
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32 /// <para>
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33 /// Если сервер успел выполнить обещание еще до того, как клиент на него подписался,
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34 /// то в момент подписки клиента будут вызваны соответсвующие события в синхронном
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35 /// режиме и клиент будет оповещен в любом случае. Иначе, обработчики добавляются в
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36 /// список в порядке подписания и в этом же порядке они будут вызваны при выполнении
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37 /// обещания.
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38 /// </para>
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39 /// <para>
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40 /// Обрабатывая результаты обещания можно преобразовывать результаты либо инициировать
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41 /// связанные асинхронные операции, которые также возвращают обещания. Для этого следует
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42 /// использовать соответствующую форму методе <c>Then</c>.
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43 /// </para>
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44 /// <para>
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45 /// Также хорошим правилом является то, что <c>Resolve</c> и <c>Reject</c> должен вызывать
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46 /// только инициатор обещания иначе могут возникнуть противоречия.
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47 /// </para>
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48 /// </remarks>
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49 public class Promise<T> : IPromise {
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50
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51 struct ResultHandlerInfo {
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52 public ResultHandler<T> resultHandler;
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53 public ErrorHandler errorHandler;
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54 }
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55
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56 readonly IPromise m_parent;
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57
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58 LinkedList<ResultHandlerInfo> m_resultHandlers = new LinkedList<ResultHandlerInfo>();
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59 LinkedList<Action> m_cancelHandlers = new LinkedList<Action>();
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60
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61 readonly object m_lock = new Object();
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62 readonly bool m_cancellable;
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63 int m_childrenCount = 0;
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64
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65 PromiseState m_state;
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66 T m_result;
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67 Exception m_error;
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68
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69 public Promise() {
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70 m_cancellable = true;
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71 }
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72
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73 public Promise(IPromise parent, bool cancellable) {
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74 m_cancellable = cancellable;
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75 m_parent = parent;
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76 if (parent != null)
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77 parent.HandleCancelled(InternalCancel);
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78 }
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79
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80 void InternalCancel() {
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81 // don't try to cancel parent :)
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82 Cancel(false);
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83 }
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84
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85 /// <summary>
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86 /// Выполняет обещание, сообщая об успешном выполнении.
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87 /// </summary>
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88 /// <param name="result">Результат выполнения.</param>
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89 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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90 public void Resolve(T result) {
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91 lock (this) {
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92 if (m_state == PromiseState.Cancelled)
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93 return;
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94 if (m_state != PromiseState.Unresolved)
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95 throw new InvalidOperationException("The promise is already resolved");
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96 m_result = result;
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97 m_state = PromiseState.Resolved;
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98 }
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99
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100 OnStateChanged();
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101 }
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102
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103 /// <summary>
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104 /// Выполняет обещание, сообщая об ошибке
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105 /// </summary>
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106 /// <param name="error">Исключение возникшее при выполнении операции</param>
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107 /// <exception cref="InvalidOperationException">Данное обещание уже выполнено</exception>
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108 public void Reject(Exception error) {
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109 lock (this) {
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110 if (m_state == PromiseState.Cancelled)
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111 return;
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112 if (m_state != PromiseState.Unresolved)
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113 throw new InvalidOperationException("The promise is already resolved");
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114 m_error = error;
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115 m_state = PromiseState.Rejected;
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116 }
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117
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118 OnStateChanged();
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119 }
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120
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121 /// <summary>
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122 /// Отменяет операцию, если это возможно.
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123 /// </summary>
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124 /// <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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125 public bool Cancel() {
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126 return Cancel(true);
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127 }
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128
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129 /// <summary>
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130 /// Adds new handlers to this promise.
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131 /// </summary>
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132 /// <param name="success">The handler of the successfully completed operation.
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133 /// This handler will recieve an operation result as a parameter.</param>
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134 /// <param name="error">Handles an exception that may occur during the operation.</param>
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135 /// <returns>The new promise chained to this one.</returns>
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136 public Promise<T> Then(ResultHandler<T> success, ErrorHandler error) {
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137 if (success == null && error == null)
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138 return this;
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139
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140 var medium = new Promise<T>(this, true);
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141
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142 var handlerInfo = new ResultHandlerInfo();
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143
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144 if (success != null)
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145 handlerInfo.resultHandler = x => {
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146 success(x);
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147 medium.Resolve(x);
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148 };
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149 else
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150 handlerInfo.resultHandler = medium.Resolve;
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151
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152 if (error != null)
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153 handlerInfo.errorHandler = x => {
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154 try {
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155 error(x);
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156 } catch { }
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157 medium.Reject(x);
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158 };
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159 else
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160 handlerInfo.errorHandler = medium.Reject;
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161
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162 AddHandler(handlerInfo);
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163
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164 return medium;
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165 }
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166
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167 /// <summary>
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168 /// Adds new handlers to this promise.
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169 /// </summary>
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170 /// <param name="success">The handler of the successfully completed operation.
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171 /// This handler will recieve an operation result as a parameter.</param>
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172 /// <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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173 /// <returns>The new promise chained to this one.</returns>
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parents: 10
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174 public Promise<T> Then(ResultHandler<T> success, ErrorHandler<T> error) {
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cin
parents: 10
diff changeset
175 if (success == null && error == null)
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parents: 10
diff changeset
176 return this;
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parents: 10
diff changeset
177
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diff changeset
178 var medium = new Promise<T>(this, true);
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parents: 10
diff changeset
179
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180 var handlerInfo = new ResultHandlerInfo();
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parents: 10
diff changeset
181
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parents: 10
diff changeset
182 if (success != null)
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parents: 10
diff changeset
183 handlerInfo.resultHandler = x => {
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parents: 10
diff changeset
184 success(x);
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cin
parents: 10
diff changeset
185 medium.Resolve(x);
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cin
parents: 10
diff changeset
186 };
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cin
parents: 10
diff changeset
187 else
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diff changeset
188 handlerInfo.resultHandler = medium.Resolve;
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parents: 10
diff changeset
189
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parents: 10
diff changeset
190 if (error != null)
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cin
parents: 10
diff changeset
191 handlerInfo.errorHandler = x => {
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parents: 10
diff changeset
192 try {
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parents: 10
diff changeset
193 medium.Resolve(error(x));
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parents: 10
diff changeset
194 } catch { }
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parents: 10
diff changeset
195 medium.Reject(x);
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parents: 10
diff changeset
196 };
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parents: 10
diff changeset
197 else
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parents: 10
diff changeset
198 handlerInfo.errorHandler = medium.Reject;
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parents: 10
diff changeset
199
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parents: 10
diff changeset
200 AddHandler(handlerInfo);
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parents: 10
diff changeset
201
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cin
parents: 10
diff changeset
202 return medium;
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cin
parents: 10
diff changeset
203 }
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parents: 10
diff changeset
204
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parents: 10
diff changeset
205
6
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parents: 2
diff changeset
206 public Promise<T> Then(ResultHandler<T> success) {
11
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parents: 10
diff changeset
207 if (success == null)
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parents: 10
diff changeset
208 return this;
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parents: 10
diff changeset
209
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parents: 10
diff changeset
210 var medium = new Promise<T>(this, true);
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parents: 10
diff changeset
211
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parents: 10
diff changeset
212 var handlerInfo = new ResultHandlerInfo();
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parents: 10
diff changeset
213
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parents: 10
diff changeset
214 if (success != null)
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parents: 10
diff changeset
215 handlerInfo.resultHandler = x => {
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parents: 10
diff changeset
216 success(x);
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cin
parents: 10
diff changeset
217 medium.Resolve(x);
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cin
parents: 10
diff changeset
218 };
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cin
parents: 10
diff changeset
219 else
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parents: 10
diff changeset
220 handlerInfo.resultHandler = medium.Resolve;
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parents: 10
diff changeset
221
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parents: 10
diff changeset
222 handlerInfo.errorHandler = medium.Reject;
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parents: 10
diff changeset
223
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parents: 10
diff changeset
224 AddHandler(handlerInfo);
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parents: 10
diff changeset
225
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parents: 10
diff changeset
226 return medium;
6
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cin
parents: 2
diff changeset
227 }
2
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parents: 1
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228
6
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229 public Promise<T> Error(ErrorHandler error) {
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230 return Then(null, error);
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parents: 2
diff changeset
231 }
2
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parents: 1
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232
11
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233 /// <summary>
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234 /// Handles error and allows to keep the promise.
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parents: 10
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235 /// </summary>
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parents: 10
diff changeset
236 /// <remarks>
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237 /// If the specified handler throws an exception, this exception will be used to reject the promise.
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parents: 10
diff changeset
238 /// </remarks>
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239 /// <param name="handler">The error handler which returns the result of the promise.</param>
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parents: 10
diff changeset
240 /// <returns>New promise.</returns>
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parents: 10
diff changeset
241 public Promise<T> Error(ErrorHandler<T> handler) {
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cin
parents: 10
diff changeset
242 if (handler == null)
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parents: 10
diff changeset
243 return this;
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parents: 10
diff changeset
244
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parents: 10
diff changeset
245 var medium = new Promise<T>(this, true);
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parents: 10
diff changeset
246
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parents: 10
diff changeset
247 AddHandler(new ResultHandlerInfo {
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parents: 10
diff changeset
248 errorHandler = e => {
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parents: 10
diff changeset
249 try {
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parents: 10
diff changeset
250 medium.Resolve(handler(e));
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cin
parents: 10
diff changeset
251 } catch (Exception e2) {
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parents: 10
diff changeset
252 medium.Reject(e2);
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parents: 10
diff changeset
253 }
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parents: 10
diff changeset
254 }
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parents: 10
diff changeset
255 });
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parents: 10
diff changeset
256
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parents: 10
diff changeset
257 return medium;
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parents: 10
diff changeset
258 }
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parents: 10
diff changeset
259
6
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parents: 2
diff changeset
260 public Promise<T> Anyway(Action handler) {
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cin
parents: 2
diff changeset
261 if (handler == null)
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parents: 2
diff changeset
262 return this;
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parents: 2
diff changeset
263
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parents: 2
diff changeset
264 var medium = new Promise<T>();
2
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parents: 1
diff changeset
265
6
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parents: 2
diff changeset
266 AddHandler(new ResultHandlerInfo {
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parents: 2
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267 resultHandler = x => {
10
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parents: 9
diff changeset
268 // to avoid handler being called multiple times we handle exception by ourselfs
6
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parents: 2
diff changeset
269 try {
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parents: 2
diff changeset
270 handler();
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parents: 2
diff changeset
271 medium.Resolve(x);
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cin
parents: 2
diff changeset
272 } catch (Exception e) {
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parents: 2
diff changeset
273 medium.Reject(e);
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cin
parents: 2
diff changeset
274 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
275 },
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cin
parents: 2
diff changeset
276 errorHandler = x => {
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parents: 2
diff changeset
277 try {
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parents: 2
diff changeset
278 handler();
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cin
parents: 2
diff changeset
279 } catch { }
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cin
parents: 2
diff changeset
280 medium.Reject(x);
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cin
parents: 2
diff changeset
281 }
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parents: 2
diff changeset
282 });
2
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parents: 1
diff changeset
283
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
284 return medium;
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cin
parents: 2
diff changeset
285 }
2
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parents: 1
diff changeset
286
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
287 /// <summary>
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diff changeset
288 /// Позволяет преобразовать результат выполения операции к новому типу.
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parents: 2
diff changeset
289 /// </summary>
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cin
parents: 2
diff changeset
290 /// <typeparam name="TNew">Новый тип результата.</typeparam>
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cin
parents: 2
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291 /// <param name="mapper">Преобразование результата к новому типу.</param>
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cin
parents: 2
diff changeset
292 /// <param name="error">Обработчик ошибки. Данный обработчик получит
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cin
parents: 2
diff changeset
293 /// исключение возникшее при выполнении операции.</param>
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cin
parents: 2
diff changeset
294 /// <returns>Новое обещание, которое будет выполнено при выполнении исходного обещания.</returns>
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cin
parents: 2
diff changeset
295 public Promise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper, ErrorHandler error) {
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cin
parents: 2
diff changeset
296 if (mapper == null)
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cin
parents: 2
diff changeset
297 throw new ArgumentNullException("mapper");
2
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parents: 1
diff changeset
298
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
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parents: 2
diff changeset
299 // создаем прицепленное обещание
10
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cin
parents: 9
diff changeset
300 var chained = new Promise<TNew>();
2
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cin
parents: 1
diff changeset
301
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
302 AddHandler(new ResultHandlerInfo() {
10
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cin
parents: 9
diff changeset
303 resultHandler = result => chained.Resolve(mapper(result)),
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
304 errorHandler = delegate(Exception e) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
305 if (error != null)
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
306 try {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
307 error(e);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
308 } catch { }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
309 // в случае ошибки нужно передать исключение дальше по цепочке
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
310 chained.Reject(e);
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cin
parents: 2
diff changeset
311 }
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cin
parents: 2
diff changeset
312 });
2
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cin
parents: 1
diff changeset
313
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
314 return chained;
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cin
parents: 2
diff changeset
315 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
316
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
317 public Promise<TNew> Map<TNew>(ResultMapper<T, TNew> mapper) {
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cin
parents: 2
diff changeset
318 return Map(mapper, null);
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cin
parents: 2
diff changeset
319 }
2
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parents: 1
diff changeset
320
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
321 /// <summary>
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cin
parents: 2
diff changeset
322 /// 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
323 /// 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
324 /// новой операции.
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cin
parents: 2
diff changeset
325 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
326 /// <typeparam name="TNew">Тип результата указанной асинхронной операции.</typeparam>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
327 /// <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
328 /// <param name="error">Обработчик ошибки. Данный обработчик получит
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
329 /// исключение возникшее при выполнении текуещй операции.</param>
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cin
parents: 2
diff changeset
330 /// <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
331 public Promise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained, ErrorHandler error) {
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cin
parents: 2
diff changeset
332
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
333 // проблема в том, что на момент связывания еще не начата асинхронная операция, поэтому нужно
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cin
parents: 2
diff changeset
334 // создать посредника, к которому будут подвызяваться следующие обработчики.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
335 // 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
336 // передать через него результаты работы.
10
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cin
parents: 9
diff changeset
337 var medium = new Promise<TNew>(this, true);
2
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cin
parents: 1
diff changeset
338
10
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cin
parents: 9
diff changeset
339 AddHandler(new ResultHandlerInfo {
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
340 resultHandler = delegate(T result) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
341 if (medium.State == PromiseState.Cancelled)
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
342 return;
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cin
parents: 9
diff changeset
343
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
344 var promise = chained(result);
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cin
parents: 9
diff changeset
345
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
346 // notify chained operation that it's not needed
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cin
parents: 9
diff changeset
347 medium.Cancelled(() => promise.Cancel());
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
348 promise.Then(
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
349 x => medium.Resolve(x),
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cin
parents: 10
diff changeset
350 e => medium.Reject(e)
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cin
parents: 10
diff changeset
351 );
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
352 },
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
353 errorHandler = delegate(Exception e) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
354 if (error != null)
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
355 error(e);
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cin
parents: 2
diff changeset
356 // в случае ошибки нужно передать исключение дальше по цепочке
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
357 medium.Reject(e);
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cin
parents: 2
diff changeset
358 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
359 });
2
aa367305156b small fixes
cin
parents: 1
diff changeset
360
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
361 return medium;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
362 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
363
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
364 public Promise<TNew> Chain<TNew>(ChainedOperation<T, TNew> chained) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
365 return Chain(chained, null);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
366 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
367
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
368 public Promise<T> Cancelled(Action handler) {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
369 if (handler == null)
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
370 return this;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
371 lock (m_lock) {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
372 if (m_state == PromiseState.Unresolved)
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
373 m_cancelHandlers.AddLast(handler);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
374 else if (m_state == PromiseState.Cancelled)
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
375 handler();
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
376 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
377 return this;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
378 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
379
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
380 public void HandleCancelled(Action handler) {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
381 Cancelled(handler);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
382 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
383
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
384 /// <summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
385 /// Дожидается отложенного обещания и в случае успеха, возвращает
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
386 /// его, результат, в противном случае бросает исключение.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
387 /// </summary>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
388 /// <remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
389 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
390 /// 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
391 /// 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
392 /// означает, что мы его не дождались, однако все зарегистрированные
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
393 /// 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
394 /// обещание будет выполнено.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
395 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
396 /// <para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
397 /// Такое поведение вполне оправдано поскольку таймаут может истечь
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
398 /// в тот момент, когда началась обработка цепочки обработчиков, и
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
399 /// 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
400 /// отклонение может привести к непрогнозируемому результату.
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
401 /// </para>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
402 /// </remarks>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
403 /// <param name="timeout">Время ожидания</param>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
404 /// <returns>Результат выполнения обещания</returns>
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
405 public T Join(int timeout) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
406 var evt = new ManualResetEvent(false);
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
407 Anyway(() => evt.Set());
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
408 Cancelled(() => evt.Set());
2
aa367305156b small fixes
cin
parents: 1
diff changeset
409
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
410 if (!evt.WaitOne(timeout, true))
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
411 throw new TimeoutException();
2
aa367305156b small fixes
cin
parents: 1
diff changeset
412
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
413 switch (State) {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
414 case PromiseState.Resolved:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
415 return m_result;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
416 case PromiseState.Cancelled:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
417 throw new OperationCanceledException();
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
418 case PromiseState.Rejected:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
419 throw new TargetInvocationException(m_error);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
420 default:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
421 throw new ApplicationException(String.Format("Invalid promise state {0}", State));
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
422 }
6
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
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
425 public T Join() {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
426 return Join(Timeout.Infinite);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
427 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
428
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
429 void AddHandler(ResultHandlerInfo handler) {
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
430 bool invokeRequired = false;
2
aa367305156b small fixes
cin
parents: 1
diff changeset
431
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
432 lock (m_lock) {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
433 m_childrenCount++;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
434 if (m_state == PromiseState.Unresolved) {
9
cin
parents: 7
diff changeset
435 m_resultHandlers.AddLast(handler);
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
436 } else
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
437 invokeRequired = true;
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
438 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
439
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
440 // обработчики не должны блокировать сам объект
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
441 if (invokeRequired)
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
442 InvokeHandler(handler);
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
443 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
444
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
445 void InvokeHandler(ResultHandlerInfo handler) {
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
446 switch (m_state) {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
447 case PromiseState.Resolved:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
448 try {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
449 if (handler.resultHandler != null)
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
450 handler.resultHandler(m_result);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
451 } catch (Exception e) {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
452 try {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
453 if (handler.errorHandler != null)
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
454 handler.errorHandler(e);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
455 } catch { }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
456 }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
457 break;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
458 case PromiseState.Rejected:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
459 try {
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
460 if (handler.errorHandler != null)
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
461 handler.errorHandler(m_error);
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
462 } catch { }
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
463 break;
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
464 default:
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
465 // do nothing
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
466 return;
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
467 }
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
468 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
469
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
470 protected virtual void OnStateChanged() {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
471 switch (m_state) {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
472 case PromiseState.Resolved:
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
473 foreach (var resultHandlerInfo in m_resultHandlers)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
474 try {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
475 if (resultHandlerInfo.resultHandler != null)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
476 resultHandlerInfo.resultHandler(m_result);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
477 } catch (Exception e) {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
478 try {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
479 if (resultHandlerInfo.errorHandler != null)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
480 resultHandlerInfo.errorHandler(e);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
481 } catch { }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
482 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
483 break;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
484 case PromiseState.Cancelled:
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
485 foreach (var cancelHandler in m_cancelHandlers)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
486 cancelHandler();
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
487 break;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
488 case PromiseState.Rejected:
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
489 foreach (var resultHandlerInfo in m_resultHandlers)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
490 try {
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
491 if (resultHandlerInfo.errorHandler != null)
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
492 resultHandlerInfo.errorHandler(m_error);
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
493 } catch { }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
494 break;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
495 default:
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
496 throw new InvalidOperationException(String.Format("Promise entered an invalid state {0}", m_state));
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
497 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
498
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
499 m_resultHandlers = null;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
500 m_cancelHandlers = null;
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
501 }
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
502
2
aa367305156b small fixes
cin
parents: 1
diff changeset
503
9
cin
parents: 7
diff changeset
504
cin
parents: 7
diff changeset
505 public bool IsExclusive {
cin
parents: 7
diff changeset
506 get {
cin
parents: 7
diff changeset
507 lock (m_lock) {
cin
parents: 7
diff changeset
508 return m_childrenCount <= 1;
cin
parents: 7
diff changeset
509 }
cin
parents: 7
diff changeset
510 }
cin
parents: 7
diff changeset
511 }
cin
parents: 7
diff changeset
512
cin
parents: 7
diff changeset
513 public PromiseState State {
cin
parents: 7
diff changeset
514 get {
cin
parents: 7
diff changeset
515 lock (m_lock) {
cin
parents: 7
diff changeset
516 return m_state;
cin
parents: 7
diff changeset
517 }
cin
parents: 7
diff changeset
518 }
cin
parents: 7
diff changeset
519 }
cin
parents: 7
diff changeset
520
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
521 protected bool Cancel(bool dependencies) {
9
cin
parents: 7
diff changeset
522 bool result;
cin
parents: 7
diff changeset
523
cin
parents: 7
diff changeset
524 lock (m_lock) {
cin
parents: 7
diff changeset
525 if (m_state == PromiseState.Unresolved) {
cin
parents: 7
diff changeset
526 m_state = PromiseState.Cancelled;
cin
parents: 7
diff changeset
527 result = true;
cin
parents: 7
diff changeset
528 } else {
cin
parents: 7
diff changeset
529 result = false;
cin
parents: 7
diff changeset
530 }
cin
parents: 7
diff changeset
531 }
cin
parents: 7
diff changeset
532
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
533 if (result)
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
534 OnStateChanged();
9
cin
parents: 7
diff changeset
535
10
aa33d0bb8c0c implemeted new cancellable promises concept
cin
parents: 9
diff changeset
536 if (dependencies && m_parent != null && m_parent.IsExclusive) {
11
6ec82bf68c8e refactoring
cin
parents: 10
diff changeset
537 m_parent.Cancel();
9
cin
parents: 7
diff changeset
538 }
cin
parents: 7
diff changeset
539
cin
parents: 7
diff changeset
540 return result;
cin
parents: 7
diff changeset
541 }
6
dfa21d507bc5 *refactoring: Promise.Then now returns a new chained promise
cin
parents: 2
diff changeset
542 }
2
aa367305156b small fixes
cin
parents: 1
diff changeset
543 }