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1 | using System; | |||
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2 | using Implab.Parallels; | |||
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3 | using System.Threading; | |||
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4 | using System.Reflection; | |||
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5 | ||||
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6 | namespace Implab { | |||
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7 | public abstract class AbstractEvent<THandler> : ICancelationToken, ICancellable { | |||
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8 | ||||
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9 | const int UNRESOLVED_SATE = 0; | |||
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10 | const int TRANSITIONAL_STATE = 1; | |||
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11 | const int SUCCEEDED_STATE = 2; | |||
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12 | const int REJECTED_STATE = 3; | |||
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13 | const int CANCELLED_STATE = 4; | |||
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14 | ||||
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15 | const int CANCEL_NOT_REQUESTED = 0; | |||
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16 | const int CANCEL_REQUESTING = 1; | |||
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17 | const int CANCEL_REQUESTED = 2; | |||
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18 | ||||
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19 | const int RESERVED_HANDLERS_COUNT = 4; | |||
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20 | ||||
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21 | int m_state; | |||
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22 | Exception m_error; | |||
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23 | int m_handlersCount; | |||
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24 | ||||
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25 | readonly THandler[] m_handlers = new THandler[RESERVED_HANDLERS_COUNT]; | |||
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26 | MTQueue<THandler> m_extraHandlers; | |||
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27 | int m_handlerPointer = -1; | |||
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28 | int m_handlersCommited; | |||
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29 | ||||
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30 | int m_cancelRequest; | |||
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31 | Exception m_cancelationReason; | |||
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32 | MTQueue<Action<Exception>> m_cancelationHandlers; | |||
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33 | ||||
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34 | ||||
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35 | #region state managment | |||
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36 | bool BeginTransit() { | |||
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37 | return UNRESOLVED_SATE == Interlocked.CompareExchange(ref m_state, TRANSITIONAL_STATE, UNRESOLVED_SATE); | |||
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38 | } | |||
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39 | ||||
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40 | void CompleteTransit(int state) { | |||
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41 | if (TRANSITIONAL_STATE != Interlocked.CompareExchange(ref m_state, state, TRANSITIONAL_STATE)) | |||
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42 | throw new InvalidOperationException("Can't complete transition when the object isn't in the transitional state"); | |||
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43 | } | |||
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44 | ||||
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45 | void WaitTransition() { | |||
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46 | while (m_state == TRANSITIONAL_STATE) { | |||
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47 | Thread.MemoryBarrier(); | |||
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48 | } | |||
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49 | } | |||
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50 | ||||
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51 | protected bool BeginSetResult() { | |||
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52 | if (!BeginTransit()) { | |||
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53 | WaitTransition(); | |||
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54 | if (m_state != CANCELLED_STATE) | |||
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55 | throw new InvalidOperationException("The promise is already resolved"); | |||
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56 | return false; | |||
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57 | } | |||
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58 | return true; | |||
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59 | } | |||
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60 | ||||
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61 | protected void EndSetResult() { | |||
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62 | CompleteTransit(SUCCEEDED_STATE); | |||
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63 | OnSuccess(); | |||
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64 | } | |||
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65 | ||||
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66 | ||||
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67 | ||||
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68 | /// <summary> | |||
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69 | /// ΠΡΠΏΠΎΠ»Π½ΡΠ΅Ρ ΠΎΠ±Π΅ΡΠ°Π½ΠΈΠ΅, ΡΠΎΠΎΠ±ΡΠ°Ρ ΠΎΠ± ΠΎΡΠΈΠ±ΠΊΠ΅ | |||
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70 | /// </summary> | |||
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71 | /// <remarks> | |||
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72 | /// ΠΠΎΡΠΊΠΎΠ»ΡΠΊΡ ΠΎΠ±Π΅ΡΠ°Π½ΠΈΠ΅ Π΄ΠΎΠ»ΠΆΠ½ΠΎ ΡΠ°Π±ΠΎΡΠ°ΡΡ Π² ΠΌΠ½ΠΎΠ³ΠΎΠΏΡΠΎΡΠ½ΠΎΠΉ ΡΡΠ΅Π΄Π΅, ΠΏΡΠΈ Π΅Π³ΠΎ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠΈ ΡΡΠ°Π·Ρ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΎ ΠΏΠΎΡΠΎΠΊΠΎΠ² | |||
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73 | /// ΠΌΠΎΠ³Ρ Π²Π΅ΡΠ½ΡΡΡ ΠΎΡΠΈΠ±ΠΊΡ, ΠΏΡΠΈ ΡΡΠΎΠΌ ΡΠΎΠ»ΡΠΊΠΎ ΠΏΠ΅ΡΠ²Π°Ρ Π±ΡΠ΄Π΅Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½Π° Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°, ΠΎΡΡΠ°Π»ΡΠ½ΡΠ΅ | |||
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74 | /// Π±ΡΠ΄ΡΡ ΠΏΡΠΎΠΈΠ³Π½ΠΎΡΠΈΡΠΎΠ²Π°Π½Ρ. | |||
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75 | /// </remarks> | |||
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76 | /// <param name="error">ΠΡΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅ Π²ΠΎΠ·Π½ΠΈΠΊΡΠ΅Π΅ ΠΏΡΠΈ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ</param> | |||
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77 | /// <exception cref="InvalidOperationException">ΠΠ°Π½Π½ΠΎΠ΅ ΠΎΠ±Π΅ΡΠ°Π½ΠΈΠ΅ ΡΠΆΠ΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΎ</exception> | |||
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78 | protected void SetError(Exception error) { | |||
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79 | if (BeginTransit()) { | |||
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80 | if (error is OperationCanceledException) { | |||
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81 | CompleteTransit(CANCELLED_STATE); | |||
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82 | m_error = error.InnerException; | |||
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83 | OnCancelled(); | |||
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84 | } else { | |||
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85 | m_error = error is PromiseTransientException ? error.InnerException : error; | |||
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86 | CompleteTransit(REJECTED_STATE); | |||
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87 | OnError(); | |||
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88 | } | |||
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89 | } else { | |||
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90 | WaitTransition(); | |||
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91 | if (m_state == SUCCEEDED_STATE) | |||
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92 | throw new InvalidOperationException("The promise is already resolved"); | |||
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93 | } | |||
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94 | } | |||
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95 | ||||
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96 | /// <summary> | |||
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97 | /// ΠΡΠΌΠ΅Π½ΡΠ΅Ρ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΡ, Π΅ΡΠ»ΠΈ ΡΡΠΎ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎ. | |||
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98 | /// </summary> | |||
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99 | /// <remarks>ΠΠ»Ρ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π±ΡΠ»Π° Π»ΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΡ ΠΎΡΠΌΠ΅Π½Π΅Π½Π° ΡΠ»Π΅Π΄ΡΠ΅Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ ΡΠ²ΠΎΠΉΡΡΠ²ΠΎ <see cref="IsCancelled"/>.</remarks> | |||
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100 | protected void SetCancelled(Exception reason) { | |||
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101 | if (BeginTransit()) { | |||
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102 | m_error = reason; | |||
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103 | CompleteTransit(CANCELLED_STATE); | |||
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104 | OnCancelled(); | |||
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105 | } | |||
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106 | } | |||
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107 | ||||
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108 | protected abstract void SignalSuccess(THandler handler); | |||
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109 | ||||
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110 | protected abstract void SignalError(THandler handler, Exception error); | |||
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111 | ||||
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112 | protected abstract void SignalCancelled(THandler handler, Exception reason); | |||
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113 | ||||
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114 | void OnSuccess() { | |||
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115 | var hp = m_handlerPointer; | |||
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116 | var slot = hp +1 ; | |||
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117 | while (slot < m_handlersCommited) { | |||
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118 | if (Interlocked.CompareExchange(ref m_handlerPointer, slot, hp) == hp) { | |||
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119 | SignalSuccess(m_handlers[slot]); | |||
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120 | } | |||
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121 | hp = m_handlerPointer; | |||
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122 | slot = hp +1 ; | |||
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123 | } | |||
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124 | ||||
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125 | ||||
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126 | if (m_extraHandlers != null) { | |||
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127 | THandler handler; | |||
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128 | while (m_extraHandlers.TryDequeue(out handler)) | |||
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129 | SignalSuccess(handler); | |||
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130 | } | |||
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131 | } | |||
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132 | ||||
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133 | void OnError() { | |||
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134 | var hp = m_handlerPointer; | |||
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135 | var slot = hp +1 ; | |||
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136 | while (slot < m_handlersCommited) { | |||
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137 | if (Interlocked.CompareExchange(ref m_handlerPointer, slot, hp) == hp) { | |||
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138 | SignalError(m_handlers[slot],m_error); | |||
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139 | } | |||
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140 | hp = m_handlerPointer; | |||
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141 | slot = hp +1 ; | |||
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142 | } | |||
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143 | ||||
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144 | if (m_extraHandlers != null) { | |||
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145 | THandler handler; | |||
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146 | while (m_extraHandlers.TryDequeue(out handler)) | |||
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147 | SignalError(handler, m_error); | |||
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148 | } | |||
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149 | } | |||
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150 | ||||
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151 | void OnCancelled() { | |||
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152 | var hp = m_handlerPointer; | |||
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153 | var slot = hp +1 ; | |||
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154 | while (slot < m_handlersCommited) { | |||
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155 | if (Interlocked.CompareExchange(ref m_handlerPointer, slot, hp) == hp) { | |||
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156 | SignalCancelled(m_handlers[slot], m_error); | |||
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157 | } | |||
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158 | hp = m_handlerPointer; | |||
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159 | slot = hp +1 ; | |||
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160 | } | |||
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161 | ||||
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162 | if (m_extraHandlers != null) { | |||
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163 | THandler handler; | |||
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164 | while (m_extraHandlers.TryDequeue(out handler)) | |||
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165 | SignalCancelled(handler, m_error); | |||
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166 | } | |||
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167 | } | |||
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168 | ||||
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169 | #endregion | |||
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170 | ||||
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171 | protected abstract Signal GetResolveSignal(); | |||
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172 | ||||
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173 | #region synchronization traits | |||
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174 | protected void WaitResult(int timeout) { | |||
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175 | if (!IsResolved) | |||
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176 | GetResolveSignal().Wait(timeout); | |||
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177 | ||||
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178 | switch (m_state) { | |||
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179 | case SUCCEEDED_STATE: | |||
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180 | return; | |||
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181 | case CANCELLED_STATE: | |||
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182 | throw new OperationCanceledException(); | |||
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183 | case REJECTED_STATE: | |||
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184 | throw new TargetInvocationException(m_error); | |||
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185 | default: | |||
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186 | throw new ApplicationException(String.Format("Invalid promise state {0}", m_state)); | |||
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187 | } | |||
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188 | } | |||
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189 | #endregion | |||
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190 | ||||
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191 | #region handlers managment | |||
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192 | ||||
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193 | protected void AddHandler(THandler handler) { | |||
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194 | ||||
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195 | if (m_state > 1) { | |||
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196 | // the promise is in the resolved state, just invoke the handler | |||
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197 | InvokeHandler(handler); | |||
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198 | } else { | |||
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199 | var slot = Interlocked.Increment(ref m_handlersCount) - 1; | |||
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200 | ||||
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201 | if (slot < RESERVED_HANDLERS_COUNT) { | |||
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202 | ||||
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203 | m_handlers[slot] = handler; | |||
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204 | ||||
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205 | while (slot != Interlocked.CompareExchange(ref m_handlersCommited, slot + 1, slot)) { | |||
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206 | } | |||
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207 | ||||
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208 | if (m_state > 1) { | |||
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209 | do { | |||
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210 | var hp = m_handlerPointer; | |||
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211 | slot = hp + 1; | |||
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212 | if (slot < m_handlersCommited) { | |||
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213 | if (Interlocked.CompareExchange(ref m_handlerPointer, slot, hp) != hp) | |||
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214 | continue; | |||
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215 | InvokeHandler(m_handlers[slot]); | |||
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216 | } | |||
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217 | break; | |||
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218 | } while(true); | |||
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219 | } | |||
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220 | } else { | |||
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221 | if (slot == RESERVED_HANDLERS_COUNT) { | |||
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222 | m_extraHandlers = new MTQueue<THandler>(); | |||
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223 | } else { | |||
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224 | while (m_extraHandlers == null) | |||
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225 | Thread.MemoryBarrier(); | |||
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226 | } | |||
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227 | ||||
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228 | m_extraHandlers.Enqueue(handler); | |||
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229 | ||||
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230 | if (m_state > 1 && m_extraHandlers.TryDequeue(out handler)) | |||
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231 | // if the promise have been resolved while we was adding the handler to the queue | |||
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232 | // we can't guarantee that someone is still processing it | |||
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233 | // therefore we need to fetch a handler from the queue and execute it | |||
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234 | // note that fetched handler may be not the one that we have added | |||
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235 | // even we can fetch no handlers at all :) | |||
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236 | InvokeHandler(handler); | |||
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237 | } | |||
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238 | } | |||
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239 | } | |||
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240 | ||||
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241 | protected void InvokeHandler(THandler handler) { | |||
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242 | switch (m_state) { | |||
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243 | case SUCCEEDED_STATE: | |||
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244 | SignalSuccess(handler); | |||
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245 | break; | |||
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246 | case CANCELLED_STATE: | |||
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247 | SignalCancelled(handler, m_error); | |||
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248 | break; | |||
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249 | case REJECTED_STATE: | |||
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250 | SignalError(handler, m_error); | |||
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251 | break; | |||
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252 | default: | |||
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253 | throw new Exception(String.Format("Invalid promise state {0}", m_state)); | |||
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254 | } | |||
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255 | } | |||
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256 | ||||
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257 | #endregion | |||
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258 | ||||
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259 | #region IPromise implementation | |||
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260 | ||||
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261 | public bool IsResolved { | |||
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262 | get { | |||
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263 | Thread.MemoryBarrier(); | |||
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264 | return m_state > 1; | |||
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265 | } | |||
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266 | } | |||
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267 | ||||
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268 | public bool IsCancelled { | |||
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269 | get { | |||
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270 | Thread.MemoryBarrier(); | |||
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271 | return m_state == CANCELLED_STATE; | |||
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272 | } | |||
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273 | } | |||
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274 | ||||
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275 | #endregion | |||
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276 | ||||
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277 | public Exception Error { | |||
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278 | get { | |||
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279 | return m_error; | |||
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280 | } | |||
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281 | } | |||
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282 | ||||
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283 | public bool AcceptIfRequested() { | |||
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284 | if (IsCancelRequested) | |||
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285 | CancelOperation(CancelReason); | |||
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286 | } | |||
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287 | ||||
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288 | public virtual void CancelOperation(Exception reason) { | |||
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289 | SetCancelled(reason); | |||
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290 | } | |||
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291 | ||||
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292 | public void CancelationRequested(Action<Exception> handler) { | |||
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293 | Safe.ArgumentNotNull(handler, "handler"); | |||
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294 | if (IsCancelRequested) | |||
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295 | handler(CancelReason); | |||
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296 | ||||
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297 | if (m_cancelationHandlers == null) | |||
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298 | Interlocked.CompareExchange(ref m_cancelationHandlers, new MTQueue<Action<Exception>>(), null); | |||
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299 | ||||
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300 | m_cancelationHandlers.Enqueue(handler); | |||
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301 | ||||
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302 | if (IsCancelRequested && m_cancelationHandlers.TryDequeue(out handler)) | |||
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303 | // TryDeque implies MemoryBarrier() | |||
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304 | handler(m_cancelationReason); | |||
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305 | } | |||
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306 | ||||
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307 | public bool IsCancelRequested { | |||
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308 | get { | |||
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309 | do { | |||
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310 | if (m_cancelRequest == CANCEL_NOT_REQUESTED) | |||
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311 | return false; | |||
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312 | if (m_cancelRequest == CANCEL_REQUESTED) | |||
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313 | return true; | |||
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314 | Thread.MemoryBarrier(); | |||
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315 | } while(true); | |||
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316 | } | |||
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317 | } | |||
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318 | ||||
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319 | public Exception CancelReason { | |||
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320 | get { | |||
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321 | do { | |||
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322 | Thread.MemoryBarrier(); | |||
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323 | } while(m_cancelRequest == CANCEL_REQUESTING); | |||
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324 | ||||
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325 | return m_cancelationReason; | |||
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326 | } | |||
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327 | } | |||
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328 | ||||
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329 | #region ICancellable implementation | |||
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330 | ||||
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331 | public void Cancel() { | |||
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332 | Cancel(null); | |||
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333 | } | |||
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334 | ||||
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335 | public void Cancel(Exception reason) { | |||
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336 | if (CANCEL_NOT_REQUESTED == Interlocked.CompareExchange(ref m_cancelRequest, CANCEL_REQUESTING)) { | |||
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337 | m_cancelationReason = reason; | |||
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338 | m_cancelRequest = CANCEL_REQUESTED; | |||
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339 | if (m_cancelationHandlers != null) { | |||
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340 | Action<Exception> handler; | |||
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341 | while (m_cancelationHandlers.TryDequeue(out handler)) | |||
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342 | handler(m_cancelationReason); | |||
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343 | } | |||
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344 | } | |||
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345 | } | |||
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346 | ||||
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347 | #endregion | |||
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348 | } | |||
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349 | } | |||
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350 |
@@ -0,0 +1,185 | |||||
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1 | using System; | |||
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2 | using Implab.Parallels; | |||
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3 | ||||
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4 | namespace Implab { | |||
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5 | public abstract class AbstractPromise<T> : AbstractEvent<AbstractPromise<T>.HandlerDescriptor>, IPromise<T> { | |||
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6 | public struct HandlerDescriptor { | |||
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7 | readonly Action m_handler; | |||
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8 | readonly Action<T> m_success; | |||
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9 | readonly Action<Exception> m_error; | |||
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10 | readonly Action<Exception> m_cancel; | |||
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11 | readonly PromiseEventType m_mask; | |||
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12 | ||||
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13 | public HandlerDescriptor(Action<T> success, Action<Exception> error, Action<Exception> cancel) { | |||
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14 | m_success = success; | |||
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15 | m_error = error; | |||
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16 | m_cancel = cancel; | |||
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17 | } | |||
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18 | ||||
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19 | public HandlerDescriptor(Action success, Action<Exception> error, Action<Exception> cancel) { | |||
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20 | m_handler = success; | |||
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21 | m_error = error; | |||
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22 | m_cancel = cancel; | |||
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23 | m_mask = PromiseEventType.Success; | |||
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24 | } | |||
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25 | ||||
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26 | public HandlerDescriptor(Action handler, PromiseEventType mask) { | |||
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27 | m_handler = handler; | |||
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28 | m_mask = mask; | |||
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29 | } | |||
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30 | ||||
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31 | public void SignalSuccess(T result) { | |||
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32 | if (m_success != null) { | |||
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33 | try { | |||
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34 | m_success(result); | |||
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35 | } catch(Exception err) { | |||
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36 | SignalError(err); | |||
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37 | } | |||
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38 | } else if (m_mask & PromiseEventType.Success && m_handler != null) { | |||
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39 | try { | |||
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40 | m_handler(); | |||
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41 | } catch(Exception err) { | |||
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42 | // avoid calling handler twice in case of error | |||
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43 | if (m_error != null) | |||
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44 | SignalError(err); | |||
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45 | } | |||
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46 | } | |||
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47 | } | |||
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48 | ||||
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49 | public void SignalError(Exception err) { | |||
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50 | if (m_error != null) { | |||
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51 | try { | |||
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52 | m_error(err); | |||
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53 | // Analysis disable once EmptyGeneralCatchClause | |||
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54 | } catch { | |||
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55 | } | |||
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56 | } else if (m_mask & PromiseEventType.Error && m_handler != null) { | |||
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57 | try { | |||
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58 | m_handler(); | |||
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59 | // Analysis disable once EmptyGeneralCatchClause | |||
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60 | } catch { | |||
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61 | } | |||
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62 | } | |||
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63 | } | |||
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64 | ||||
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65 | public void SignalCancel(Exception reason) { | |||
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66 | if (m_cancel != null) { | |||
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67 | try { | |||
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68 | m_cancel(reason); | |||
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69 | } catch (Exception err) { | |||
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70 | SignalError(err); | |||
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71 | } | |||
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72 | } else if (m_mask & PromiseEventType.Cancelled && m_handler != null) { | |||
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73 | try { | |||
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74 | m_handler(); | |||
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75 | // Analysis disable once EmptyGeneralCatchClause | |||
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76 | } catch { | |||
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77 | } | |||
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78 | } | |||
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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 | ||||
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84 | public Type PromiseType { | |||
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85 | get { | |||
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86 | return typeof(T); | |||
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87 | } | |||
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88 | } | |||
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89 | ||||
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90 | public new T Join() { | |||
|
91 | WaitResult(-1); | |||
|
92 | return m_result; | |||
|
93 | } | |||
|
94 | public new T Join(int timeout) { | |||
|
95 | WaitResult(timeout); | |||
|
96 | return m_result; | |||
|
97 | } | |||
|
98 | ||||
|
99 | public IPromise<T> On(Action<T> success, Action<Exception> error, Action<Exception> cancel) { | |||
|
100 | AddHandler(new HandlerDescriptor(success, error, cancel)); | |||
|
101 | return this; | |||
|
102 | } | |||
|
103 | ||||
|
104 | public IPromise<T> On(Action<T> success, Action<Exception> error) { | |||
|
105 | AddHandler(new HandlerDescriptor(success, error, null)); | |||
|
106 | return this; | |||
|
107 | } | |||
|
108 | ||||
|
109 | public IPromise<T> On(Action<T> success) { | |||
|
110 | AddHandler(new HandlerDescriptor(success, null, null)); | |||
|
111 | return this; | |||
|
112 | } | |||
|
113 | ||||
|
114 | public IPromise<T> On(Action handler, PromiseEventType events) { | |||
|
115 | AddHandler(new HandlerDescriptor(handler, events)); | |||
|
116 | return this; | |||
|
117 | } | |||
|
118 | ||||
|
119 | public IPromise<T> On(Action success, Action<Exception> error, Action<Exception> cancel) { | |||
|
120 | AddHandler(new HandlerDescriptor(success, error, cancel)); | |||
|
121 | return this; | |||
|
122 | } | |||
|
123 | ||||
|
124 | public IPromise<T> On(Action success, Action<Exception> error) { | |||
|
125 | AddHandler(new HandlerDescriptor(success, error, null)); | |||
|
126 | return this; | |||
|
127 | } | |||
|
128 | ||||
|
129 | public IPromise<T> On(Action success) { | |||
|
130 | AddHandler(new HandlerDescriptor(success, null, null)); | |||
|
131 | return this; | |||
|
132 | } | |||
|
133 | ||||
|
134 | IPromise IPromise.On(Action success, Action<Exception> error, Action<Exception> cancel) { | |||
|
135 | AddHandler(new HandlerDescriptor(success, error, cancel)); | |||
|
136 | return this; | |||
|
137 | } | |||
|
138 | ||||
|
139 | IPromise IPromise.On(Action success, Action<Exception> error) { | |||
|
140 | AddHandler(new HandlerDescriptor(success, error, null)); | |||
|
141 | return this; | |||
|
142 | } | |||
|
143 | ||||
|
144 | IPromise IPromise.On(Action success) { | |||
|
145 | AddHandler(new HandlerDescriptor(success, null, null)); | |||
|
146 | return this; | |||
|
147 | } | |||
|
148 | ||||
|
149 | public IPromise<T2> Cast<T2>() { | |||
|
150 | return (IPromise<T2>)this; | |||
|
151 | } | |||
|
152 | ||||
|
153 | #region implemented abstract members of AbstractPromise | |||
|
154 | ||||
|
155 | protected override Signal GetResolveSignal() { | |||
|
156 | var signal = new Signal(); | |||
|
157 | AddHandler(new HandlerDescriptor(signal.Set, PromiseEventType.All)); | |||
|
158 | return signal; | |||
|
159 | } | |||
|
160 | ||||
|
161 | protected override void SignalSuccess(HandlerDescriptor handler) { | |||
|
162 | handler.SignalSuccess(m_result); | |||
|
163 | } | |||
|
164 | ||||
|
165 | protected override void SignalError(HandlerDescriptor handler, Exception error) { | |||
|
166 | handler.SignalError(error); | |||
|
167 | } | |||
|
168 | ||||
|
169 | protected override void SignalCancelled(HandlerDescriptor handler, Exception reason) { | |||
|
170 | handler.SignalCancel(reason); | |||
|
171 | } | |||
|
172 | ||||
|
173 | #endregion | |||
|
174 | ||||
|
175 | T m_result; | |||
|
176 | ||||
|
177 | protected void SetResult(T value) { | |||
|
178 | if (BeginSetResult()) { | |||
|
179 | m_result = value; | |||
|
180 | EndSetResult(); | |||
|
181 | } | |||
|
182 | } | |||
|
183 | } | |||
|
184 | } | |||
|
185 |
@@ -0,0 +1,54 | |||||
|
1 | using System; | |||
|
2 | using System.Threading; | |||
|
3 | ||||
|
4 | namespace Implab { | |||
|
5 | public class ChainTask : AbstractPromise, IDeferred { | |||
|
6 | readonly Func<IPromise> m_task; | |||
|
7 | readonly Action<Exception> m_error; | |||
|
8 | readonly Action<Exception> m_cancel; | |||
|
9 | ||||
|
10 | int m_cancelationLock; | |||
|
11 | ||||
|
12 | public ChainTask(Func<IPromise> task, Func<Exception> error, Func<Exception> cancel) { | |||
|
13 | m_task = task; | |||
|
14 | } | |||
|
15 | ||||
|
16 | public void Resolve() { | |||
|
17 | if (m_task != null && LockCancelation()) { | |||
|
18 | try { | |||
|
19 | var operation = m_task(); | |||
|
20 | if (operation == null) | |||
|
21 | throw new NullReferenceException("The task returned null promise"); | |||
|
22 | ||||
|
23 | operation.On(SetResult, SetError, SetCancelled); | |||
|
24 | ||||
|
25 | CancelationRequested(operation.Cancel); | |||
|
26 | } catch(Exception err) { | |||
|
27 | HandleErrorInternal(err); | |||
|
28 | } | |||
|
29 | } | |||
|
30 | } | |||
|
31 | ||||
|
32 | public void Reject(Exception error) { | |||
|
33 | throw new NotImplementedException(); | |||
|
34 | } | |||
|
35 | ||||
|
36 | protected void HandleErrorInternal(Exception error) { | |||
|
37 | if (m_error != null) { | |||
|
38 | try { | |||
|
39 | m_error(error); | |||
|
40 | SetResult(); | |||
|
41 | } catch(Exception err) { | |||
|
42 | SetError(err); | |||
|
43 | } | |||
|
44 | } else { | |||
|
45 | SetError(error); | |||
|
46 | } | |||
|
47 | } | |||
|
48 | ||||
|
49 | protected bool LockCancelation() { | |||
|
50 | return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0); | |||
|
51 | } | |||
|
52 | } | |||
|
53 | } | |||
|
54 |
@@ -0,0 +1,23 | |||||
|
1 | using System; | |||
|
2 | using System.Threading; | |||
|
3 | ||||
|
4 | namespace Implab { | |||
|
5 | public class FuncTask<T> : FuncTaskBase<T>, IDeferred { | |||
|
6 | readonly Func<T> m_task; | |||
|
7 | ||||
|
8 | public FuncTask(Func<T> task, Func<Exception, T> error, Func<Exception, T> cancel) : base(error,cancel) { | |||
|
9 | m_task = task; | |||
|
10 | } | |||
|
11 | ||||
|
12 | public void Resolve() { | |||
|
13 | if (m_task != null && LockCancelation()) { | |||
|
14 | try { | |||
|
15 | SetResult(m_task()); | |||
|
16 | } catch(Exception err) { | |||
|
17 | HandleErrorInternal(err); | |||
|
18 | } | |||
|
19 | } | |||
|
20 | } | |||
|
21 | } | |||
|
22 | } | |||
|
23 |
@@ -0,0 +1,53 | |||||
|
1 | using System; | |||
|
2 | using System.Threading; | |||
|
3 | ||||
|
4 | namespace Implab { | |||
|
5 | public class FuncTaskBase<TResult> : AbstractPromise<TResult> { | |||
|
6 | readonly Func<Exception, TResult> m_cancel; | |||
|
7 | readonly Func<Exception, TResult> m_error; | |||
|
8 | ||||
|
9 | int m_cancelationLock; | |||
|
10 | ||||
|
11 | protected FuncTaskBase( Func<Exception, TResult> error, Func<Exception, TResult> cancel) { | |||
|
12 | m_error = error; | |||
|
13 | m_cancel = cancel; | |||
|
14 | } | |||
|
15 | ||||
|
16 | public void Reject(Exception error) { | |||
|
17 | Safe.ArgumentNotNull(error, "error"); | |||
|
18 | if (LockCancelation()) | |||
|
19 | HandleErrorInternal(error); | |||
|
20 | } | |||
|
21 | ||||
|
22 | protected void HandleErrorInternal(Exception error) { | |||
|
23 | if (m_error != null) { | |||
|
24 | try { | |||
|
25 | SetResult(m_error(error)); | |||
|
26 | } catch(Exception err) { | |||
|
27 | SetError(err); | |||
|
28 | } | |||
|
29 | } else { | |||
|
30 | SetError(error); | |||
|
31 | } | |||
|
32 | } | |||
|
33 | ||||
|
34 | public override void CancelOperation(Exception reason) { | |||
|
35 | if (LockCancelation()) { | |||
|
36 | if (m_cancel != null) { | |||
|
37 | try { | |||
|
38 | SetResult(m_cancel(reason)); | |||
|
39 | } catch (Exception err) { | |||
|
40 | HandleErrorInternal(err); | |||
|
41 | } | |||
|
42 | } else { | |||
|
43 | SetCancelled(reason); | |||
|
44 | } | |||
|
45 | } | |||
|
46 | } | |||
|
47 | ||||
|
48 | protected bool LockCancelation() { | |||
|
49 | return 0 == Interlocked.CompareExchange(ref m_cancelationLock, 1, 0); | |||
|
50 | } | |||
|
51 | } | |||
|
52 | } | |||
|
53 |
@@ -0,0 +1,22 | |||||
|
1 | using System; | |||
|
2 | ||||
|
3 | namespace Implab { | |||
|
4 | public class FuncTask<TArg, TResult> : FuncTaskBase<TResult>, IDeferred<TArg> { | |||
|
5 | readonly Func<TArg, TResult> m_task; | |||
|
6 | ||||
|
7 | public FuncTask(Func<TArg, TResult> task, Func<Exception, TResult> error,Func<Exception, TResult> cancel) : base(error,cancel) { | |||
|
8 | m_task = task; | |||
|
9 | } | |||
|
10 | ||||
|
11 | public void Resolve(TArg value) { | |||
|
12 | if (m_task != null && LockCancelation()) { | |||
|
13 | try { | |||
|
14 | SetResult(m_task(value)); | |||
|
15 | } catch (Exception err) { | |||
|
16 | HandleErrorInternal(err); | |||
|
17 | } | |||
|
18 | } | |||
|
19 | } | |||
|
20 | } | |||
|
21 | } | |||
|
22 |
@@ -1,295 +1,135 | |||||
1 | using System; |
|
1 | using System; | |
2 | using Implab.Parallels; |
|
2 | using Implab.Parallels; | |
3 | using System.Threading; |
|
|||
4 | using System.Reflection; |
|
|||
5 |
|
3 | |||
6 | namespace Implab { |
|
4 | namespace Implab { | |
7 |
public abstract class AbstractPromise< |
|
5 | public abstract class AbstractPromise : AbstractEvent<AbstractPromise.HandlerDescriptor>, IPromise { | |
8 |
|
6 | public struct HandlerDescriptor { | ||
9 | const int UNRESOLVED_SATE = 0; |
|
7 | readonly Action m_handler; | |
10 | const int TRANSITIONAL_STATE = 1; |
|
8 | readonly Action<Exception> m_error; | |
11 | const int SUCCEEDED_STATE = 2; |
|
9 | readonly Action<Exception> m_cancel; | |
12 | const int REJECTED_STATE = 3; |
|
10 | readonly PromiseEventType m_mask; | |
13 | const int CANCELLED_STATE = 4; |
|
|||
14 |
|
||||
15 | const int RESERVED_HANDLERS_COUNT = 4; |
|
|||
16 |
|
11 | |||
17 | int m_state; |
|
12 | public HandlerDescriptor(Action success, Action<Exception> error, Action<Exception> cancel) { | |
18 | Exception m_error; |
|
13 | m_handler = success; | |
19 | int m_handlersCount; |
|
14 | m_error = error; | |
20 |
|
15 | m_cancel = cancel; | ||
21 | readonly THandler[] m_handlers = new THandler[RESERVED_HANDLERS_COUNT]; |
|
16 | m_mask = PromiseEventType.Success; | |
22 | MTQueue<THandler> m_extraHandlers; |
|
|||
23 | int m_handlerPointer = -1; |
|
|||
24 | int m_handlersCommited; |
|
|||
25 |
|
||||
26 | #region state managment |
|
|||
27 | bool BeginTransit() { |
|
|||
28 | return UNRESOLVED_SATE == Interlocked.CompareExchange(ref m_state, TRANSITIONAL_STATE, UNRESOLVED_SATE); |
|
|||
29 | } |
|
17 | } | |
30 |
|
18 | |||
31 | void CompleteTransit(int state) { |
|
19 | public HandlerDescriptor(Action handler, PromiseEventType mask) { | |
32 | if (TRANSITIONAL_STATE != Interlocked.CompareExchange(ref m_state, state, TRANSITIONAL_STATE)) |
|
20 | m_handler = handler; | |
33 | throw new InvalidOperationException("Can't complete transition when the object isn't in the transitional state"); |
|
21 | m_mask = mask; | |
34 | } |
|
22 | } | |
35 |
|
23 | |||
36 | void WaitTransition() { |
|
24 | public void SignalSuccess() { | |
37 | while (m_state == TRANSITIONAL_STATE) { |
|
25 | if (m_mask & PromiseEventType.Success && m_handler != null) { | |
38 | Thread.MemoryBarrier(); |
|
26 | try { | |
|
27 | m_handler(); | |||
|
28 | } catch (Exception err) { | |||
|
29 | // avoid calling handler twice in case of error | |||
|
30 | if (m_error != null) | |||
|
31 | SignalError(err); | |||
|
32 | } | |||
39 | } |
|
33 | } | |
40 | } |
|
34 | } | |
41 |
|
35 | |||
42 | protected bool BeginSetResult() { |
|
36 | public void SignalError(Exception err) { | |
43 | if (!BeginTransit()) { |
|
37 | if (m_error != null) { | |
44 |
|
|
38 | try { | |
45 | if (m_state != CANCELLED_STATE) |
|
39 | m_error(err); | |
46 | throw new InvalidOperationException("The promise is already resolved"); |
|
40 | // Analysis disable once EmptyGeneralCatchClause | |
47 |
|
|
41 | } catch { | |
48 | } |
|
42 | } | |
49 | return true; |
|
43 | } else if (m_mask & PromiseEventType.Error && m_handler != null) { | |
|
44 | try { | |||
|
45 | m_handler(); | |||
|
46 | // Analysis disable once EmptyGeneralCatchClause | |||
|
47 | } catch { | |||
|
48 | } | |||
|
49 | } | |||
50 | } |
|
50 | } | |
51 |
|
51 | |||
52 | protected void EndSetResult() { |
|
52 | public void SignalCancel(Exception reason) { | |
53 | CompleteTransit(SUCCEEDED_STATE); |
|
53 | if (m_cancel != null) { | |
54 | OnSuccess(); |
|
54 | try { | |
|
55 | m_cancel(reason); | |||
|
56 | } catch (Exception err) { | |||
|
57 | SignalError(err); | |||
|
58 | } | |||
|
59 | } else if (m_mask & PromiseEventType.Cancelled && m_handler != null) { | |||
|
60 | try { | |||
|
61 | m_handler(); | |||
|
62 | // Analysis disable once EmptyGeneralCatchClause | |||
|
63 | } catch { | |||
|
64 | } | |||
|
65 | } | |||
|
66 | } | |||
55 | } |
|
67 | } | |
56 |
|
68 | |||
57 |
|
69 | |||
|
70 | #region implemented abstract members of AbstractPromise | |||
58 |
|
71 | |||
59 | /// <summary> |
|
72 | protected override void SignalSuccess(HandlerDescriptor handler) { | |
60 | /// ΠΡΠΏΠΎΠ»Π½ΡΠ΅Ρ ΠΎΠ±Π΅ΡΠ°Π½ΠΈΠ΅, ΡΠΎΠΎΠ±ΡΠ°Ρ ΠΎΠ± ΠΎΡΠΈΠ±ΠΊΠ΅ |
|
73 | handler.SignalSuccess(); | |
61 | /// </summary> |
|
|||
62 | /// <remarks> |
|
|||
63 | /// ΠΠΎΡΠΊΠΎΠ»ΡΠΊΡ ΠΎΠ±Π΅ΡΠ°Π½ΠΈΠ΅ Π΄ΠΎΠ»ΠΆΠ½ΠΎ ΡΠ°Π±ΠΎΡΠ°ΡΡ Π² ΠΌΠ½ΠΎΠ³ΠΎΠΏΡΠΎΡΠ½ΠΎΠΉ ΡΡΠ΅Π΄Π΅, ΠΏΡΠΈ Π΅Π³ΠΎ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠΈ ΡΡΠ°Π·Ρ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΎ ΠΏΠΎΡΠΎΠΊΠΎΠ² |
|
|||
64 | /// ΠΌΠΎΠ³Ρ Π²Π΅ΡΠ½ΡΡΡ ΠΎΡΠΈΠ±ΠΊΡ, ΠΏΡΠΈ ΡΡΠΎΠΌ ΡΠΎΠ»ΡΠΊΠΎ ΠΏΠ΅ΡΠ²Π°Ρ Π±ΡΠ΄Π΅Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½Π° Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΠ°, ΠΎΡΡΠ°Π»ΡΠ½ΡΠ΅ |
|
|||
65 | /// Π±ΡΠ΄ΡΡ ΠΏΡΠΎΠΈΠ³Π½ΠΎΡΠΈΡΠΎΠ²Π°Π½Ρ. |
|
|||
66 | /// </remarks> |
|
|||
67 | /// <param name="error">ΠΡΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅ Π²ΠΎΠ·Π½ΠΈΠΊΡΠ΅Π΅ ΠΏΡΠΈ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ</param> |
|
|||
68 | /// <exception cref="InvalidOperationException">ΠΠ°Π½Π½ΠΎΠ΅ ΠΎΠ±Π΅ΡΠ°Π½ΠΈΠ΅ ΡΠΆΠ΅ Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΎ</exception> |
|
|||
69 | protected void SetError(Exception error) { |
|
|||
70 | if (BeginTransit()) { |
|
|||
71 | if (error is OperationCanceledException) { |
|
|||
72 | CompleteTransit(CANCELLED_STATE); |
|
|||
73 | m_error = error.InnerException; |
|
|||
74 | OnCancelled(); |
|
|||
75 | } else { |
|
|||
76 | m_error = error is PromiseTransientException ? error.InnerException : error; |
|
|||
77 | CompleteTransit(REJECTED_STATE); |
|
|||
78 | OnError(); |
|
|||
79 | } |
|
|||
80 | } else { |
|
|||
81 | WaitTransition(); |
|
|||
82 | if (m_state == SUCCEEDED_STATE) |
|
|||
83 | throw new InvalidOperationException("The promise is already resolved"); |
|
|||
84 | } |
|
|||
85 | } |
|
|||
86 |
|
||||
87 | /// <summary> |
|
|||
88 | /// ΠΡΠΌΠ΅Π½ΡΠ΅Ρ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΡ, Π΅ΡΠ»ΠΈ ΡΡΠΎ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎ. |
|
|||
89 | /// </summary> |
|
|||
90 | /// <remarks>ΠΠ»Ρ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ Π±ΡΠ»Π° Π»ΠΈ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΡ ΠΎΡΠΌΠ΅Π½Π΅Π½Π° ΡΠ»Π΅Π΄ΡΠ΅Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ ΡΠ²ΠΎΠΉΡΡΠ²ΠΎ <see cref="IsCancelled"/>.</remarks> |
|
|||
91 | protected void SetCancelled(Exception reason) { |
|
|||
92 | if (BeginTransit()) { |
|
|||
93 | m_error = reason; |
|
|||
94 | CompleteTransit(CANCELLED_STATE); |
|
|||
95 | OnCancelled(); |
|
|||
96 | } |
|
|||
97 | } |
|
74 | } | |
98 |
|
75 | |||
99 |
protected |
|
76 | protected override void SignalError(HandlerDescriptor handler, Exception error) { | |
100 |
|
77 | handler.SignalError(error); | ||
101 | protected abstract void SignalError(THandler handler, Exception error); |
|
|||
102 |
|
||||
103 | protected abstract void SignalCancelled(THandler handler, Exception reason); |
|
|||
104 |
|
||||
105 | void OnSuccess() { |
|
|||
106 | var hp = m_handlerPointer; |
|
|||
107 | var slot = hp +1 ; |
|
|||
108 | while (slot < m_handlersCommited) { |
|
|||
109 | if (Interlocked.CompareExchange(ref m_handlerPointer, slot, hp) == hp) { |
|
|||
110 | SignalSuccess(m_handlers[slot]); |
|
|||
111 | } |
|
|||
112 | hp = m_handlerPointer; |
|
|||
113 | slot = hp +1 ; |
|
|||
114 | } |
|
|||
115 |
|
||||
116 |
|
||||
117 | if (m_extraHandlers != null) { |
|
|||
118 | THandler handler; |
|
|||
119 | while (m_extraHandlers.TryDequeue(out handler)) |
|
|||
120 | SignalSuccess(handler); |
|
|||
121 | } |
|
|||
122 | } |
|
78 | } | |
123 |
|
79 | |||
124 | void OnError() { |
|
80 | protected override void SignalCancelled(HandlerDescriptor handler, Exception reason) { | |
125 | var hp = m_handlerPointer; |
|
81 | handler.SignalCancel(reason); | |
126 | var slot = hp +1 ; |
|
|||
127 | while (slot < m_handlersCommited) { |
|
|||
128 | if (Interlocked.CompareExchange(ref m_handlerPointer, slot, hp) == hp) { |
|
|||
129 | SignalError(m_handlers[slot],m_error); |
|
|||
130 | } |
|
|||
131 | hp = m_handlerPointer; |
|
|||
132 | slot = hp +1 ; |
|
|||
133 |
|
|
82 | } | |
134 |
|
83 | |||
135 | if (m_extraHandlers != null) { |
|
84 | protected override Signal GetResolveSignal() { | |
136 | THandler handler; |
|
85 | var signal = new Signal(); | |
137 | while (m_extraHandlers.TryDequeue(out handler)) |
|
86 | On(signal.Set, PromiseEventType.All); | |
138 | SignalError(handler, m_error); |
|
|||
139 | } |
|
|||
140 | } |
|
|||
141 |
|
||||
142 | void OnCancelled() { |
|
|||
143 | var hp = m_handlerPointer; |
|
|||
144 | var slot = hp +1 ; |
|
|||
145 | while (slot < m_handlersCommited) { |
|
|||
146 | if (Interlocked.CompareExchange(ref m_handlerPointer, slot, hp) == hp) { |
|
|||
147 | SignalCancelled(m_handlers[slot], m_error); |
|
|||
148 | } |
|
|||
149 | hp = m_handlerPointer; |
|
|||
150 | slot = hp +1 ; |
|
|||
151 | } |
|
|||
152 |
|
||||
153 | if (m_extraHandlers != null) { |
|
|||
154 | THandler handler; |
|
|||
155 | while (m_extraHandlers.TryDequeue(out handler)) |
|
|||
156 | SignalCancelled(handler, m_error); |
|
|||
157 | } |
|
|||
158 | } |
|
87 | } | |
159 |
|
88 | |||
160 | #endregion |
|
89 | #endregion | |
161 |
|
90 | |||
162 | protected abstract void Listen(PromiseEventType events, Action handler); |
|
|||
163 |
|
91 | |||
164 | #region synchronization traits |
|
92 | public Type PromiseType { | |
165 | protected void WaitResult(int timeout) { |
|
93 | get { | |
166 | if (!IsResolved) { |
|
94 | return typeof(void); | |
167 | var lk = new object(); |
|
|||
168 |
|
||||
169 | Listen(PromiseEventType.All, () => { |
|
|||
170 | lock(lk) { |
|
|||
171 | Monitor.Pulse(lk); |
|
|||
172 | } |
|
|||
173 | }); |
|
|||
174 |
|
||||
175 | lock (lk) { |
|
|||
176 | while(!IsResolved) { |
|
|||
177 | if(!Monitor.Wait(lk,timeout)) |
|
|||
178 | throw new TimeoutException(); |
|
|||
179 |
|
|
95 | } | |
180 |
|
|
96 | } | |
181 |
|
97 | |||
|
98 | public IPromise On(Action success, Action<Exception> error, Action<Exception> cancel) { | |||
|
99 | AddHandler(new HandlerDescriptor(success, error, cancel)); | |||
|
100 | return this; | |||
182 |
|
|
101 | } | |
183 | switch (m_state) { |
|
|||
184 | case SUCCEEDED_STATE: |
|
|||
185 | return; |
|
|||
186 | case CANCELLED_STATE: |
|
|||
187 | throw new OperationCanceledException(); |
|
|||
188 | case REJECTED_STATE: |
|
|||
189 | throw new TargetInvocationException(m_error); |
|
|||
190 | default: |
|
|||
191 | throw new ApplicationException(String.Format("Invalid promise state {0}", m_state)); |
|
|||
192 | } |
|
|||
193 | } |
|
|||
194 | #endregion |
|
|||
195 |
|
102 | |||
196 | #region handlers managment |
|
103 | public IPromise On(Action success, Action<Exception> error) { | |
197 |
|
104 | AddHandler(new HandlerDescriptor(success, error, null)); | ||
198 | protected void AddHandler(THandler handler) { |
|
105 | return this; | |
199 |
|
||||
200 | if (m_state > 1) { |
|
|||
201 | // the promise is in the resolved state, just invoke the handler |
|
|||
202 | InvokeHandler(handler); |
|
|||
203 | } else { |
|
|||
204 | var slot = Interlocked.Increment(ref m_handlersCount) - 1; |
|
|||
205 |
|
||||
206 | if (slot < RESERVED_HANDLERS_COUNT) { |
|
|||
207 | m_handlers[slot] = handler; |
|
|||
208 |
|
||||
209 | while (slot != Interlocked.CompareExchange(ref m_handlersCommited, slot + 1, slot)) { |
|
|||
210 |
|
|
106 | } | |
211 |
|
107 | |||
212 | if (m_state > 1) { |
|
108 | public IPromise On(Action success) { | |
213 | do { |
|
109 | AddHandler(new HandlerDescriptor(success, null, null)); | |
214 | var hp = m_handlerPointer; |
|
110 | return this; | |
215 | slot = hp + 1; |
|
|||
216 | if (slot < m_handlersCommited) { |
|
|||
217 | if (Interlocked.CompareExchange(ref m_handlerPointer, slot, hp) != hp) |
|
|||
218 | continue; |
|
|||
219 | InvokeHandler(m_handlers[slot]); |
|
|||
220 | } |
|
|||
221 | break; |
|
|||
222 | } while(true); |
|
|||
223 | } |
|
|||
224 | } else { |
|
|||
225 | if (slot == RESERVED_HANDLERS_COUNT) { |
|
|||
226 | m_extraHandlers = new MTQueue<THandler>(); |
|
|||
227 | } else { |
|
|||
228 | while (m_extraHandlers == null) |
|
|||
229 | Thread.MemoryBarrier(); |
|
|||
230 |
|
|
111 | } | |
231 |
|
112 | |||
232 | m_extraHandlers.Enqueue(handler); |
|
113 | public IPromise On(Action handler, PromiseEventType events) { | |
233 |
|
114 | AddHandler(new HandlerDescriptor(handler,events)); | ||
234 | if (m_state > 1 && m_extraHandlers.TryDequeue(out handler)) |
|
115 | return this; | |
235 | // if the promise have been resolved while we was adding the handler to the queue |
|
|||
236 | // we can't guarantee that someone is still processing it |
|
|||
237 | // therefore we need to fetch a handler from the queue and execute it |
|
|||
238 | // note that fetched handler may be not the one that we have added |
|
|||
239 | // even we can fetch no handlers at all :) |
|
|||
240 | InvokeHandler(handler); |
|
|||
241 | } |
|
|||
242 | } |
|
|||
243 | } |
|
116 | } | |
244 |
|
117 | |||
245 | protected void InvokeHandler(THandler handler) { |
|
118 | public IPromise<T> Cast<T>() { | |
246 | switch (m_state) { |
|
119 | throw new InvalidCastException(); | |
247 | case SUCCEEDED_STATE: |
|
|||
248 | SignalSuccess(handler); |
|
|||
249 | break; |
|
|||
250 | case CANCELLED_STATE: |
|
|||
251 | SignalCancelled(handler, m_error); |
|
|||
252 | break; |
|
|||
253 | case REJECTED_STATE: |
|
|||
254 | SignalError(handler, m_error); |
|
|||
255 | break; |
|
|||
256 | default: |
|
|||
257 | throw new Exception(String.Format("Invalid promise state {0}", m_state)); |
|
|||
258 | } |
|
|||
259 | } |
|
|||
260 |
|
||||
261 | #endregion |
|
|||
262 |
|
||||
263 | #region IPromise implementation |
|
|||
264 |
|
||||
265 | public void Join(int timeout) { |
|
|||
266 | WaitResult(timeout); |
|
|||
267 | } |
|
120 | } | |
268 |
|
121 | |||
269 | public void Join() { |
|
122 | public void Join() { | |
270 | WaitResult(-1); |
|
123 | WaitResult(-1); | |
271 | } |
|
124 | } | |
272 |
|
125 | |||
273 | public bool IsResolved { |
|
126 | public void Join(int timeout) { | |
274 | get { |
|
127 | WaitResult(timeout); | |
275 | Thread.MemoryBarrier(); |
|
|||
276 | return m_state > 1; |
|
|||
277 | } |
|
|||
278 | } |
|
128 | } | |
279 |
|
129 | |||
280 | public bool IsCancelled { |
|
130 | protected void SetResult() { | |
281 |
|
|
131 | BeginSetResult(); | |
282 | Thread.MemoryBarrier(); |
|
132 | EndSetResult(); | |
283 | return m_state == CANCELLED_STATE; |
|
|||
284 | } |
|
|||
285 | } |
|
|||
286 |
|
||||
287 | #endregion |
|
|||
288 |
|
||||
289 | public Exception Error { |
|
|||
290 | get { |
|
|||
291 | return m_error; |
|
|||
292 | } |
|
|||
293 | } |
|
133 | } | |
294 | } |
|
134 | } | |
295 | } |
|
135 | } |
@@ -22,14 +22,14 namespace Implab { | |||||
22 | /// Sets the token to cancelled state. |
|
22 | /// Sets the token to cancelled state. | |
23 | /// </summary> |
|
23 | /// </summary> | |
24 | /// <param name="reason">The reason why the operation was cancelled.</param> |
|
24 | /// <param name="reason">The reason why the operation was cancelled.</param> | |
25 |
void |
|
25 | void CancelOperation(Exception reason); | |
26 |
|
26 | |||
27 | /// <summary> |
|
27 | /// <summary> | |
28 | /// Adds the listener for the cancellation request, is the cancellation was requested the <paramref name="handler"/> |
|
28 | /// Adds the listener for the cancellation request, is the cancellation was requested the <paramref name="handler"/> | |
29 | /// is executed immediatelly. |
|
29 | /// is executed immediatelly. | |
30 | /// </summary> |
|
30 | /// </summary> | |
31 | /// <param name="handler">The handler which will be executed if the cancel occurs.</param> |
|
31 | /// <param name="handler">The handler which will be executed if the cancel occurs.</param> | |
32 |
void Cancel |
|
32 | void CancelationRequested(Action<Exception> handler); | |
33 |
|
33 | |||
34 | } |
|
34 | } | |
35 | } |
|
35 | } |
@@ -58,13 +58,13 namespace Implab { | |||||
58 | /// exception it will be passed to the dependent promise. |
|
58 | /// exception it will be passed to the dependent promise. | |
59 | /// </para> |
|
59 | /// </para> | |
60 | /// </remarks> |
|
60 | /// </remarks> | |
61 | IPromise Then(Action success, Action<Exception> error, Action<Exception> cancel); |
|
61 | /* IPromise Then(Action success, Action<Exception> error, Action<Exception> cancel); | |
62 | IPromise Then(Action success, Action<Exception> error); |
|
62 | IPromise Then(Action success, Action<Exception> error); | |
63 | IPromise Then(Action success); |
|
63 | IPromise Then(Action success); | |
64 |
|
|
64 | ||
65 | IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error, Func<Exception, IPromise> cancel); |
|
65 | IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error, Func<Exception, IPromise> cancel); | |
66 | IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error); |
|
66 | IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error); | |
67 |
|
|
67 | IPromise Chain(Func<IPromise> chained);*/ | |
68 |
|
68 | |||
69 | /// <summary> |
|
69 | /// <summary> | |
70 | /// Adds specified listeners to the current promise. |
|
70 | /// Adds specified listeners to the current promise. |
@@ -3,28 +3,23 | |||||
3 | namespace Implab { |
|
3 | namespace Implab { | |
4 | public interface IPromise<out T> : IPromise { |
|
4 | public interface IPromise<out T> : IPromise { | |
5 |
|
5 | |||
6 | new T Join(); |
|
|||
7 |
|
||||
8 | new T Join(int timeout); |
|
|||
9 |
|
||||
10 | IPromise<T> On(Action<T> success, Action<Exception> error, Action<Exception> cancel); |
|
6 | IPromise<T> On(Action<T> success, Action<Exception> error, Action<Exception> cancel); | |
11 |
|
7 | |||
12 | IPromise<T> On(Action<T> success, Action<Exception> error); |
|
8 | IPromise<T> On(Action<T> success, Action<Exception> error); | |
13 |
|
9 | |||
14 | IPromise<T> On(Action<T> success); |
|
10 | IPromise<T> On(Action<T> success); | |
15 |
|
11 | |||
|
12 | new T Join(); | |||
|
13 | ||||
|
14 | new T Join(int timeout); | |||
|
15 | ||||
|
16 | new IPromise<T> On(Action success, Action<Exception> error, Action<Exception> cancel); | |||
|
17 | ||||
|
18 | new IPromise<T> On(Action success, Action<Exception> error); | |||
|
19 | ||||
|
20 | new IPromise<T> On(Action success); | |||
|
21 | ||||
16 | new IPromise<T> On(Action handler, PromiseEventType events); |
|
22 | new IPromise<T> On(Action handler, PromiseEventType events); | |
17 |
|
23 | |||
18 | IPromise<T2> Then<T2>(Func<T, T2> mapper, Func<Exception, T2> error, Func<Exception, T2> cancel); |
|
|||
19 |
|
||||
20 | IPromise<T2> Then<T2>(Func<T, T2> mapper, Func<Exception, T2> error); |
|
|||
21 |
|
||||
22 | IPromise<T2> Then<T2>(Func<T, T2> mapper); |
|
|||
23 |
|
||||
24 | IPromise<T2> Chain<T2>(Func<T, IPromise<T2>> chained, Func<Exception, IPromise<T2>> error, Func<Exception, IPromise<T2>> cancel); |
|
|||
25 |
|
||||
26 | IPromise<T2> Chain<T2>(Func<T, IPromise<T2>> chained, Func<Exception, IPromise<T2>> error); |
|
|||
27 |
|
||||
28 | IPromise<T2> Chain<T2>(Func<T, IPromise<T2>> chained); |
|
|||
29 | } |
|
24 | } | |
30 | } |
|
25 | } |
@@ -150,7 +150,6 | |||||
150 | <Compile Include="PromiseT.cs" /> |
|
150 | <Compile Include="PromiseT.cs" /> | |
151 | <Compile Include="IDeferred.cs" /> |
|
151 | <Compile Include="IDeferred.cs" /> | |
152 | <Compile Include="IDeferredT.cs" /> |
|
152 | <Compile Include="IDeferredT.cs" /> | |
153 | <Compile Include="AbstractPromise.cs" /> |
|
|||
154 | <Compile Include="Promise.cs" /> |
|
153 | <Compile Include="Promise.cs" /> | |
155 | <Compile Include="PromiseTransientException.cs" /> |
|
154 | <Compile Include="PromiseTransientException.cs" /> | |
156 | <Compile Include="Parallels\Signal.cs" /> |
|
155 | <Compile Include="Parallels\Signal.cs" /> | |
@@ -159,6 +158,13 | |||||
159 | <Compile Include="Diagnostics\ListenerBase.cs" /> |
|
158 | <Compile Include="Diagnostics\ListenerBase.cs" /> | |
160 | <Compile Include="Parallels\BlockingQueue.cs" /> |
|
159 | <Compile Include="Parallels\BlockingQueue.cs" /> | |
161 | <Compile Include="ICancelationToken.cs" /> |
|
160 | <Compile Include="ICancelationToken.cs" /> | |
|
161 | <Compile Include="AbstractEvent.cs" /> | |||
|
162 | <Compile Include="AbstractPromise.cs" /> | |||
|
163 | <Compile Include="AbstractPromiseT.cs" /> | |||
|
164 | <Compile Include="FuncTask.cs" /> | |||
|
165 | <Compile Include="FuncTaskBase.cs" /> | |||
|
166 | <Compile Include="FuncTaskT.cs" /> | |||
|
167 | <Compile Include="ChainTask.cs" /> | |||
162 | </ItemGroup> |
|
168 | </ItemGroup> | |
163 | <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" /> |
|
169 | <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" /> | |
164 | <ItemGroup /> |
|
170 | <ItemGroup /> |
@@ -1,222 +1,22 | |||||
1 | using System; |
|
1 | using System; | |
2 | using System.Diagnostics; |
|
2 | using Implab.Parallels; | |
3 |
|
3 | |||
4 | namespace Implab { |
|
4 | namespace Implab { | |
5 |
public class Promise : AbstractPromise |
|
5 | public class Promise : AbstractPromise, IDeferred { | |
6 |
|
6 | public static readonly Promise SUCCESS; | ||
7 | public struct HandlerDescriptor { |
|
|||
8 | readonly Action m_success; |
|
|||
9 | readonly Action<Exception> m_error; |
|
|||
10 | readonly Action<Exception> m_cancel; |
|
|||
11 | readonly IDeferred m_deferred; |
|
|||
12 |
|
||||
13 | public HandlerDescriptor(Action success, Action<Exception> error, Action<Exception> cancel, IDeferred deferred) { |
|
|||
14 | m_success = success; |
|
|||
15 | m_error = error; |
|
|||
16 | m_cancel = cancel; |
|
|||
17 | m_deferred = deferred; |
|
|||
18 | } |
|
|||
19 |
|
||||
20 | public void SignalSuccess() { |
|
|||
21 | if (m_success != null) { |
|
|||
22 | try { |
|
|||
23 | m_success(); |
|
|||
24 | if (m_deferred != null) |
|
|||
25 | m_deferred.Resolve(); |
|
|||
26 | } catch (Exception err) { |
|
|||
27 | SignalError(err); |
|
|||
28 | } |
|
|||
29 | } |
|
|||
30 | } |
|
|||
31 |
|
7 | |||
32 | public void SignalError(Exception err) { |
|
8 | static Promise() { | |
33 | if (m_error != null) { |
|
9 | SUCCESS = new Promise(); | |
34 | try { |
|
10 | SUCCESS.Resolve(); | |
35 | m_error(err); |
|
|||
36 | if (m_deferred != null) |
|
|||
37 | m_deferred.Resolve(); |
|
|||
38 | } catch (Exception err2) { |
|
|||
39 | if (m_deferred != null) |
|
|||
40 | m_deferred.Reject(err2); |
|
|||
41 | } |
|
|||
42 | } else { |
|
|||
43 | if (m_deferred != null) |
|
|||
44 | m_deferred.Reject(err); |
|
|||
45 | } |
|
|||
46 | } |
|
|||
47 |
|
||||
48 | public void SignalCancel(Exception reason) { |
|
|||
49 | if (m_cancel != null) { |
|
|||
50 | try { |
|
|||
51 | m_cancel(reason); |
|
|||
52 | if (m_deferred != null) |
|
|||
53 | m_deferred.Resolve(); |
|
|||
54 | } catch (Exception err) { |
|
|||
55 | SignalError(err); |
|
|||
56 | } |
|
|||
57 | } else if (reason != null && m_error != null) { |
|
|||
58 | try { |
|
|||
59 | m_error(new OperationCanceledException("The operation was canceled.", reason)); |
|
|||
60 | if (m_deferred != null) |
|
|||
61 | m_deferred.Resolve(); |
|
|||
62 | } catch (Exception err) { |
|
|||
63 | SignalError(err); |
|
|||
64 | } |
|
|||
65 | } else { |
|
|||
66 | if (m_deferred != null) |
|
|||
67 | m_deferred.Cancel(reason); |
|
|||
68 | } |
|
|||
69 | } |
|
|||
70 | } |
|
11 | } | |
71 |
|
12 | |||
72 | public void Resolve() { |
|
13 | public void Resolve() { | |
73 |
|
|
14 | SetResult(); | |
74 | EndSetResult(); |
|
|||
75 | } |
|
15 | } | |
76 |
|
16 | |||
77 | public void Reject(Exception error) { |
|
17 | public void Reject(Exception error) { | |
78 | SetError(error); |
|
18 | SetError(error); | |
79 | } |
|
19 | } | |
80 |
|
||||
81 | #region implemented abstract members of AbstractPromise |
|
|||
82 |
|
||||
83 | protected override void SignalSuccess(HandlerDescriptor handler) { |
|
|||
84 | handler.SignalSuccess(); |
|
|||
85 | } |
|
|||
86 |
|
||||
87 | protected override void SignalError(HandlerDescriptor handler, Exception error) { |
|
|||
88 | handler.SignalError(error); |
|
|||
89 | } |
|
|||
90 |
|
||||
91 | protected override void SignalCancelled(HandlerDescriptor handler, Exception reason) { |
|
|||
92 | handler.SignalCancel(reason); |
|
|||
93 | } |
|
|||
94 |
|
||||
95 | protected override void Listen(PromiseEventType events, Action handler) { |
|
|||
96 | AddHandler(new HandlerDescriptor( |
|
|||
97 | events.HasFlag(PromiseEventType.Success) ? handler : null, |
|
|||
98 | events.HasFlag(PromiseEventType.Error) ? new Action<Exception>(err => handler()) : null, |
|
|||
99 | events.HasFlag(PromiseEventType.Cancelled) ? new Action<Exception>(reason => handler()) : null, |
|
|||
100 | null |
|
|||
101 | )); |
|
|||
102 | } |
|
|||
103 |
|
||||
104 | #endregion |
|
|||
105 |
|
||||
106 |
|
||||
107 | public Type PromiseType { |
|
|||
108 | get { |
|
|||
109 | return typeof(void); |
|
|||
110 | } |
|
20 | } | |
111 | } |
|
21 | } | |
112 |
|
22 | |||
113 | public IPromise Then(Action success, Action<Exception> error, Action<Exception> cancel) { |
|
|||
114 | var promise = new Promise(); |
|
|||
115 | if (success != null) |
|
|||
116 | promise.On(Cancel, PromiseEventType.Cancelled); |
|
|||
117 |
|
||||
118 | AddHandler(new HandlerDescriptor(success, error, cancel, promise)); |
|
|||
119 |
|
||||
120 | return promise; |
|
|||
121 | } |
|
|||
122 |
|
||||
123 | public IPromise Then(Action success, Action<Exception> error) { |
|
|||
124 | return Then(success, error, null); |
|
|||
125 | } |
|
|||
126 |
|
||||
127 | public IPromise Then(Action success) { |
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128 | return Then(success, null, null); |
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129 | } |
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130 |
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131 | public IPromise On(Action success, Action<Exception> error, Action<Exception> cancel) { |
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132 | AddHandler(new HandlerDescriptor(success, error, cancel, null)); |
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133 | return this; |
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134 | } |
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135 |
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136 | public IPromise On(Action success, Action<Exception> error) { |
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137 | return On(success, error, null); |
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138 | } |
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139 |
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140 | public IPromise On(Action success) { |
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141 | return On(success, null, null); |
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142 | } |
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143 |
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144 | public IPromise On(Action handler, PromiseEventType events) { |
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145 | return On( |
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146 | events.HasFlag(PromiseEventType.Success) ? handler : null, |
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147 | events.HasFlag(PromiseEventType.Error) ? new Action<Exception>(err => handler()) : null, |
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148 | events.HasFlag(PromiseEventType.Cancelled) ? new Action<Exception>(reason => handler()) : null |
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149 | ); |
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150 | } |
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151 |
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152 | public IPromise<T> Cast<T>() { |
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153 | throw new InvalidCastException(); |
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154 | } |
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155 |
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156 | public IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error, Func<Exception,IPromise> cancel) { |
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157 | var medium = new Promise(); |
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158 |
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159 | On( |
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160 | () => { |
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161 | if (medium.IsCancelled) |
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162 | return; |
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163 | if (chained != null) |
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164 | ConnectPromise(chained(), medium); |
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165 | }, |
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166 | ex => { |
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167 | if (medium.IsCancelled) |
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168 | return; |
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169 | if (error != null) { |
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170 | try { |
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171 | ConnectPromise(error(ex), medium); |
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172 | } catch (Exception ex2) { |
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173 | medium.Reject(ex2); |
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174 | } |
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175 | } else { |
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176 | medium.Reject(ex); |
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177 | } |
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178 | }, |
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179 | reason => { |
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180 | if (medium.IsCancelled) |
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181 | return; |
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182 | if (cancel != null) |
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183 | ConnectPromise(cancel(reason), medium); |
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184 | else |
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185 | medium.Cancel(reason); |
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186 | } |
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187 | ); |
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188 |
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189 | if (chained != null) |
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190 | medium.On(Cancel, PromiseEventType.Cancelled); |
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191 |
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192 | return medium; |
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193 | } |
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194 |
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195 | static void ConnectPromise(IPromise result, Promise medium) { |
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196 | if (result != null) { |
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197 | result.On( |
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198 | medium.Resolve, |
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199 | medium.Reject, |
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200 | medium.Cancel |
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201 | ); |
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202 | medium.On(null,null,result.Cancel); |
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203 | } else { |
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204 | medium.Reject( |
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205 | new NullReferenceException( |
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206 | "The chained asynchronous operation returned" + |
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207 | " 'null' where the promise instance is expected" |
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208 | ) |
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209 | ); |
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210 | } |
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211 | } |
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212 |
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213 | public IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error) { |
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214 | return Chain(chained, error, null); |
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215 | } |
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216 |
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217 | public IPromise Chain(Func<IPromise> chained) { |
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218 | return Chain(chained, null, null); |
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219 | } |
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220 | } |
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221 | } |
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222 |
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This diff has been collapsed as it changes many lines, (533 lines changed) Show them Hide them | |||||
@@ -1,5 +1,6 | |||||
1 | using System; |
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1 | using System; | |
2 | using System.Diagnostics; |
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2 | using System.Diagnostics; | |
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3 | using Implab.Parallels; | |||
3 |
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4 | |||
4 | namespace Implab { |
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5 | namespace Implab { | |
5 |
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6 | |||
@@ -37,538 +38,26 namespace Implab { | |||||
37 | /// ΡΠΎΠ»ΡΠΊΠΎ ΠΈΠ½ΠΈΡΠΈΠ°ΡΠΎΡ ΠΎΠ±Π΅ΡΠ°Π½ΠΈΡ ΠΈΠ½Π°ΡΠ΅ ΠΌΠΎΠ³ΡΡ Π²ΠΎΠ·Π½ΠΈΠΊΠ½ΡΡΡ ΠΏΡΠΎΡΠΈΠ²ΠΎΡΠ΅ΡΠΈΡ. |
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38 | /// ΡΠΎΠ»ΡΠΊΠΎ ΠΈΠ½ΠΈΡΠΈΠ°ΡΠΎΡ ΠΎΠ±Π΅ΡΠ°Π½ΠΈΡ ΠΈΠ½Π°ΡΠ΅ ΠΌΠΎΠ³ΡΡ Π²ΠΎΠ·Π½ΠΈΠΊΠ½ΡΡΡ ΠΏΡΠΎΡΠΈΠ²ΠΎΡΠ΅ΡΠΈΡ. | |
38 | /// </para> |
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39 | /// </para> | |
39 | /// </remarks> |
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40 | /// </remarks> | |
40 |
public class Promise<T> : AbstractPromise< |
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41 | public class Promise<T> : AbstractPromise<T>, IDeferred<T> { | |
41 |
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42 | class StubDeferred : IDeferred, IDeferred<T> { |
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43 | public static readonly StubDeferred instance = new StubDeferred(); |
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44 |
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45 | StubDeferred() { |
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46 | } |
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47 |
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48 | #region IDeferred implementation |
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49 |
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50 | public void Resolve(T value) { |
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51 | } |
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52 |
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53 | public void Resolve() { |
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54 | } |
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55 |
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56 | public void Reject(Exception error) { |
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57 | } |
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58 |
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59 | #endregion |
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60 |
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61 | #region ICancellable implementation |
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62 |
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63 | public void Cancel() { |
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64 | } |
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65 |
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66 | public void Cancel(Exception reason) { |
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67 | } |
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68 |
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69 | #endregion |
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70 |
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71 |
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72 | } |
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73 |
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74 | class RemapDescriptor<T2> : IDeferred<T> { |
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75 | readonly Func<T,T2> m_remap; |
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76 | readonly Func<Exception, T2> m_failed; |
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77 | readonly Func<Exception, T2> m_cancel; |
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78 | readonly IDeferred<T2> m_deferred; |
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79 |
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80 | public RemapDescriptor(Func<T,T2> remap, Func<Exception,T2> failed, Func<Exception, T2> cancel, IDeferred<T2> deferred ) { |
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81 | Debug.Assert(deferred != null); |
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82 | m_remap = remap; |
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83 | m_failed = failed; |
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84 | m_cancel = cancel; |
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85 | m_deferred = deferred; |
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86 | } |
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87 |
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88 |
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89 |
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90 | #region IDeferred implementation |
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91 |
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92 | public void Resolve(T value) { |
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93 | if (m_remap != null) { |
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94 | try { |
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95 | m_deferred.Resolve(m_remap(value)); |
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96 | } catch (Exception ex) { |
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97 | Reject(ex); |
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98 | } |
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99 | } |
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100 | } |
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101 |
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42 | |||
102 | public void Reject(Exception error) { |
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43 | public static IPromise<T> FromResult(T value) { | |
103 | if (m_failed != null) { |
|
44 | var p = new Promise<T>(); | |
104 | try { |
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45 | p.Resolve(value); | |
105 | m_deferred.Resolve(m_failed(error)); |
|
46 | return p; | |
106 | } catch (Exception ex) { |
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107 | m_deferred.Reject(ex); |
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108 | } |
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109 | } else { |
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110 | m_deferred.Reject(error); |
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111 | } |
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112 | } |
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113 |
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114 |
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115 | #endregion |
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116 |
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117 | #region ICancellable implementation |
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118 |
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119 | public void Cancel(Exception reason) { |
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120 | if (m_cancel != null) { |
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121 | try { |
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122 | m_deferred.Resolve(m_cancel(reason)); |
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123 | } catch (Exception ex) { |
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124 | Reject(ex); |
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125 | } |
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126 | } else { |
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127 | m_deferred.Cancel(reason); |
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128 | } |
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129 | } |
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130 |
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131 | public void Cancel() { |
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132 | Cancel(null); |
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133 | } |
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134 | #endregion |
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135 | } |
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136 |
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137 | class ListenerDescriptor : IDeferred<T> { |
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138 | readonly Action m_handler; |
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139 | readonly PromiseEventType m_events; |
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140 |
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141 | public ListenerDescriptor(Action handler, PromiseEventType events) { |
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142 | Debug.Assert(handler != null); |
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143 |
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144 | m_handler = handler; |
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145 | m_events = events; |
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146 | } |
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147 |
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148 | #region IDeferred implementation |
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149 |
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150 | public void Resolve(T value) { |
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151 | if (m_events.HasFlag(PromiseEventType.Success)) { |
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152 | try { |
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153 | m_handler(); |
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154 | // Analysis disable once EmptyGeneralCatchClause |
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155 | } catch { |
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156 | } |
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157 | } |
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158 | } |
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159 |
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160 | public void Reject(Exception error) { |
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161 | if (m_events.HasFlag(PromiseEventType.Error)){ |
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162 | try { |
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163 | m_handler(); |
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164 | // Analysis disable once EmptyGeneralCatchClause |
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165 | } catch { |
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166 | } |
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167 | } |
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168 | } |
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169 |
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170 | #endregion |
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171 |
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172 | #region ICancellable implementation |
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173 |
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174 | public void Cancel() { |
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175 | Cancel(null); |
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176 |
|
|
47 | } | |
177 |
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48 | |||
178 |
|
|
49 | public static IPromise<T> FromException(Exception error) { | |
179 | if (m_events.HasFlag(PromiseEventType.Cancelled)){ |
|
50 | var p = new Promise<T>(); | |
180 | try { |
|
51 | p.Reject(error); | |
181 | m_handler(); |
|
52 | return p; | |
182 | // Analysis disable once EmptyGeneralCatchClause |
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183 | } catch { |
|
|||
184 | } |
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185 | } |
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186 | } |
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187 |
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188 | #endregion |
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189 | } |
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190 |
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191 | class ValueEventDescriptor : IDeferred<T> { |
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192 | readonly Action<T> m_success; |
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193 | readonly Action<Exception> m_failed; |
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194 | readonly Action<Exception> m_cancelled; |
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195 | readonly IDeferred<T> m_deferred; |
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196 |
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197 | public ValueEventDescriptor(Action<T> success, Action<Exception> failed, Action<Exception> cancelled, IDeferred<T> deferred) { |
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198 | Debug.Assert(deferred != null); |
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199 |
|
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200 | m_success = success; |
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201 | m_failed = failed; |
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202 | m_cancelled = cancelled; |
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203 | m_deferred = deferred; |
|
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204 | } |
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205 |
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206 | #region IDeferred implementation |
|
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207 |
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208 | public void Resolve(T value) { |
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|||
209 | if (m_success != null) { |
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210 | try { |
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211 | m_success(value); |
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212 | m_deferred.Resolve(value); |
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213 | } catch (Exception ex) { |
|
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214 | Reject(ex); |
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|||
215 | } |
|
|||
216 | } |
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|||
217 | } |
|
|||
218 |
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219 | public void Reject(Exception error) { |
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|||
220 | if (m_failed != null) { |
|
|||
221 | try { |
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|||
222 | m_failed(error); |
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223 | m_deferred.Resolve(default(T)); |
|
|||
224 | } catch(Exception ex) { |
|
|||
225 | m_deferred.Reject(ex); |
|
|||
226 | } |
|
|||
227 | } else { |
|
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228 | m_deferred.Reject(error); |
|
|||
229 | } |
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|||
230 | } |
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|||
231 |
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232 | #endregion |
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233 |
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234 | #region ICancellable implementation |
|
|||
235 |
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||||
236 | public void Cancel(Exception reason) { |
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|||
237 | if (m_cancelled != null) { |
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|||
238 | try { |
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|||
239 | m_cancelled(reason); |
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240 | m_deferred.Resolve(default(T)); |
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|||
241 | } catch (Exception ex) { |
|
|||
242 | Reject(ex); |
|
|||
243 | } |
|
|||
244 | } else { |
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245 | m_deferred.Cancel(reason); |
|
|||
246 | } |
|
|||
247 | } |
|
|||
248 |
|
||||
249 | public void Cancel() { |
|
|||
250 | Cancel(null); |
|
|||
251 |
|
|
53 | } | |
252 |
|
54 | |||
253 | #endregion |
|
|||
254 | } |
|
|||
255 |
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||||
256 | public class EventDescriptor : IDeferred<T> { |
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|||
257 | readonly Action m_success; |
|
|||
258 | readonly Action<Exception> m_failed; |
|
|||
259 | readonly Action<Exception> m_cancelled; |
|
|||
260 | readonly IDeferred m_deferred; |
|
|||
261 |
|
||||
262 | public EventDescriptor(Action success, Action<Exception> failed, Action<Exception> cancelled, IDeferred deferred) { |
|
|||
263 | Debug.Assert(deferred != null); |
|
|||
264 |
|
||||
265 | m_success = success; |
|
|||
266 | m_failed = failed; |
|
|||
267 | m_cancelled = cancelled; |
|
|||
268 | m_deferred = deferred; |
|
|||
269 | } |
|
|||
270 |
|
||||
271 | #region IDeferred implementation |
|
|||
272 |
|
||||
273 | public void Resolve(T value) { |
|
|||
274 | if (m_success != null) { |
|
|||
275 | try { |
|
|||
276 | m_success(); |
|
|||
277 | m_deferred.Resolve(); |
|
|||
278 | } catch (Exception ex) { |
|
|||
279 | Reject(ex); |
|
|||
280 | } |
|
|||
281 | } |
|
|||
282 | } |
|
|||
283 |
|
||||
284 | public void Reject(Exception error) { |
|
|||
285 | if (m_failed != null) { |
|
|||
286 | try { |
|
|||
287 | m_failed(error); |
|
|||
288 | m_deferred.Resolve(); |
|
|||
289 | } catch (Exception ex) { |
|
|||
290 | m_deferred.Reject(ex); |
|
|||
291 | } |
|
|||
292 | } else { |
|
|||
293 | m_deferred.Reject(error); |
|
|||
294 | } |
|
|||
295 | } |
|
|||
296 |
|
||||
297 | #endregion |
|
|||
298 |
|
||||
299 | #region ICancellable implementation |
|
|||
300 |
|
||||
301 | public void Cancel(Exception reason) { |
|
|||
302 | if (m_cancelled != null) { |
|
|||
303 | try { |
|
|||
304 | m_cancelled(reason); |
|
|||
305 | m_deferred.Resolve(); |
|
|||
306 | } catch (Exception ex) { |
|
|||
307 | Reject(ex); |
|
|||
308 | } |
|
|||
309 | } else { |
|
|||
310 | m_deferred.Cancel(reason); |
|
|||
311 | } |
|
|||
312 | } |
|
|||
313 |
|
||||
314 | public void Cancel() { |
|
|||
315 | Cancel(null); |
|
|||
316 | } |
|
|||
317 |
|
||||
318 | #endregion |
|
|||
319 | } |
|
|||
320 |
|
||||
321 | T m_result; |
|
|||
322 |
|
||||
323 | public virtual void Resolve(T value) { |
|
55 | public virtual void Resolve(T value) { | |
324 |
|
|
56 | SetResult(value); | |
325 | m_result = value; |
|
|||
326 | EndSetResult(); |
|
|||
327 | } |
|
|||
328 | } |
|
57 | } | |
329 |
|
58 | |||
330 | public void Reject(Exception error) { |
|
59 | public void Reject(Exception error) { | |
331 | SetError(error); |
|
60 | SetError(error); | |
332 | } |
|
61 | } | |
333 |
|
||||
334 | public Type PromiseType { |
|
|||
335 | get { |
|
|||
336 | return typeof(T); |
|
|||
337 | } |
|
|||
338 | } |
|
|||
339 |
|
||||
340 | public new T Join() { |
|
|||
341 | WaitResult(-1); |
|
|||
342 | return m_result; |
|
|||
343 | } |
|
|||
344 | public new T Join(int timeout) { |
|
|||
345 | WaitResult(timeout); |
|
|||
346 | return m_result; |
|
|||
347 | } |
|
|||
348 |
|
||||
349 | public IPromise<T> On(Action<T> success, Action<Exception> error, Action<Exception> cancel) { |
|
|||
350 | AddHandler(new ValueEventDescriptor(success, error, cancel, StubDeferred.instance)); |
|
|||
351 | return this; |
|
|||
352 | } |
|
|||
353 |
|
||||
354 | public IPromise<T> On(Action<T> success, Action<Exception> error) { |
|
|||
355 | AddHandler(new ValueEventDescriptor(success, error, null, StubDeferred.instance)); |
|
|||
356 | return this; |
|
|||
357 | } |
|
|||
358 |
|
||||
359 | public IPromise<T> On(Action<T> success) { |
|
|||
360 | AddHandler(new ValueEventDescriptor(success, null, null, StubDeferred.instance)); |
|
|||
361 | return this; |
|
|||
362 | } |
|
|||
363 |
|
||||
364 | public IPromise<T> On(Action handler, PromiseEventType events) { |
|
|||
365 | Listen(events, handler); |
|
|||
366 | return this; |
|
|||
367 | } |
|
|||
368 |
|
||||
369 | public IPromise<T2> Then<T2>(Func<T, T2> mapper, Func<Exception, T2> error, Func<Exception, T2> cancel) { |
|
|||
370 | var promise = new Promise<T2>(); |
|
|||
371 | if (mapper != null) |
|
|||
372 | promise.On((Action)null, null, Cancel); |
|
|||
373 | AddHandler(new RemapDescriptor<T2>(mapper, error, cancel, promise)); |
|
|||
374 | return promise; |
|
|||
375 | } |
|
|||
376 |
|
||||
377 | public IPromise<T2> Then<T2>(Func<T, T2> mapper, Func<Exception, T2> error) { |
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378 | var promise = new Promise<T2>(); |
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379 | if (mapper != null) |
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380 | promise.On((Action)null, null, Cancel); |
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381 | AddHandler(new RemapDescriptor<T2>(mapper, error, null, promise)); |
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382 | return promise; |
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383 | } |
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384 |
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385 | public IPromise<T2> Then<T2>(Func<T, T2> mapper) { |
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386 | var promise = new Promise<T2>(); |
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387 | if (mapper != null) |
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388 | promise.On((Action)null, null, Cancel); |
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389 | AddHandler(new RemapDescriptor<T2>(mapper, null, null, promise)); |
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390 | return promise; |
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391 | } |
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392 |
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393 | public IPromise<T2> Chain<T2>(Func<T, IPromise<T2>> chained, Func<Exception, IPromise<T2>> error, Func<Exception, IPromise<T2>> cancel) { |
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394 | // this promise will be resolved when an asyc operation is started |
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395 | var promise = new Promise<IPromise<T2>>(); |
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396 |
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397 | AddHandler(new RemapDescriptor<IPromise<T2>>( |
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398 | chained, |
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399 | error, |
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400 | cancel, |
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401 | promise |
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402 | )); |
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403 |
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404 | var medium = new Promise<T2>(); |
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405 |
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406 | if (chained != null) |
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407 | medium.On(Cancel, PromiseEventType.Cancelled); |
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408 |
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409 | // we need to connect started async operation with the medium |
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410 | // if the async operation hasn't been started by the some reason |
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411 | // report is to the medium |
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412 | promise.On( |
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413 | result => ConnectPromise<T2>(result, medium), |
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414 | medium.Reject, |
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415 | medium.Cancel |
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416 | ); |
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417 |
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418 | return medium; |
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|||
419 | } |
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420 |
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||||
421 | static void ConnectPromise<T2>(IPromise<T2> result, Promise<T2> medium) { |
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422 | if (result != null) { |
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423 | result.On( |
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424 | medium.Resolve, |
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425 | medium.Reject, |
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426 | medium.Cancel |
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427 | ); |
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428 | medium.On(result.Cancel, PromiseEventType.Cancelled); |
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429 | } else { |
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430 | medium.Reject( |
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431 | new NullReferenceException( |
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432 | "The chained asynchronous operation returned" + |
|
|||
433 | " 'null' where the promise instance is expected" |
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|||
434 | ) |
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|||
435 | ); |
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|||
436 | } |
|
62 | } | |
437 | } |
|
63 | } | |
438 |
|
||||
439 | public IPromise<T2> Chain<T2>(Func<T, IPromise<T2>> chained, Func<Exception, IPromise<T2>> error) { |
|
|||
440 | return Chain(chained, error, null); |
|
|||
441 | } |
|
|||
442 |
|
||||
443 | public IPromise<T2> Chain<T2>(Func<T, IPromise<T2>> chained) { |
|
|||
444 | return Chain(chained, null, null); |
|
|||
445 | } |
|
|||
446 |
|
||||
447 | public IPromise Then(Action success, Action<Exception> error, Action<Exception> cancel) { |
|
|||
448 | var promise = new Promise(); |
|
|||
449 | if (success != null) |
|
|||
450 | promise.On(null, null, Cancel); |
|
|||
451 |
|
||||
452 | AddHandler(new EventDescriptor(success, error, cancel, promise)); |
|
|||
453 |
|
||||
454 | return promise; |
|
|||
455 | } |
|
|||
456 |
|
||||
457 | public IPromise Then(Action success, Action<Exception> error) { |
|
|||
458 | return Then(success, error, null); |
|
|||
459 | } |
|
|||
460 |
|
||||
461 | public IPromise Then(Action success) { |
|
|||
462 | return Then(success, null, null); |
|
|||
463 | } |
|
|||
464 |
|
||||
465 | public IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error, Func<Exception, IPromise> cancel) { |
|
|||
466 | var promise = new Promise<IPromise>(); |
|
|||
467 |
|
||||
468 | AddHandler( |
|
|||
469 | new RemapDescriptor<IPromise>( |
|
|||
470 | x => chained(), |
|
|||
471 | error, |
|
|||
472 | cancel, |
|
|||
473 | promise |
|
|||
474 | ) |
|
|||
475 | ); |
|
|||
476 |
|
||||
477 | var medium = new Promise(); |
|
|||
478 | if (chained != null) |
|
|||
479 | medium.On(null, null, Cancel); |
|
|||
480 |
|
||||
481 | promise.On( |
|
|||
482 | result => ConnectPromise(result, medium), |
|
|||
483 | medium.Reject, |
|
|||
484 | medium.Cancel |
|
|||
485 | ); |
|
|||
486 |
|
||||
487 | return medium; |
|
|||
488 | } |
|
|||
489 |
|
||||
490 | static void ConnectPromise(IPromise result, Promise medium) { |
|
|||
491 | if (result != null) { |
|
|||
492 | result.On( |
|
|||
493 | medium.Resolve, |
|
|||
494 | medium.Reject, |
|
|||
495 | medium.Cancel |
|
|||
496 | ); |
|
|||
497 | medium.On(null, null, result.Cancel); |
|
|||
498 | } else { |
|
|||
499 | medium.Reject( |
|
|||
500 | new NullReferenceException( |
|
|||
501 | "The chained asynchronous operation returned" + |
|
|||
502 | " 'null' where the promise instance is expected" |
|
|||
503 | ) |
|
|||
504 | ); |
|
|||
505 | } |
|
|||
506 | } |
|
|||
507 |
|
||||
508 | public IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error) { |
|
|||
509 | return Chain(chained, error, null); |
|
|||
510 | } |
|
|||
511 |
|
||||
512 | public IPromise Chain(Func<IPromise> chained) { |
|
|||
513 | return Chain(chained, null, null); |
|
|||
514 | } |
|
|||
515 |
|
||||
516 | public IPromise On(Action success, Action<Exception> error, Action<Exception> cancel) { |
|
|||
517 | AddHandler(new EventDescriptor(success,error,cancel, StubDeferred.instance)); |
|
|||
518 | return this; |
|
|||
519 | } |
|
|||
520 |
|
||||
521 | public IPromise On(Action success, Action<Exception> error) { |
|
|||
522 | AddHandler(new EventDescriptor(success, error, null, StubDeferred.instance)); |
|
|||
523 | return this; |
|
|||
524 | } |
|
|||
525 |
|
||||
526 | public IPromise On(Action success) { |
|
|||
527 | Listen(PromiseEventType.Success, success); |
|
|||
528 | return this; |
|
|||
529 | } |
|
|||
530 |
|
||||
531 | IPromise IPromise.On(Action handler, PromiseEventType events) { |
|
|||
532 | Listen(events,handler); |
|
|||
533 | return this; |
|
|||
534 | } |
|
|||
535 |
|
||||
536 | public IPromise<T2> Cast<T2>() { |
|
|||
537 | return (IPromise<T2>)this; |
|
|||
538 | } |
|
|||
539 |
|
||||
540 | #region implemented abstract members of AbstractPromise |
|
|||
541 |
|
||||
542 | protected override void SignalSuccess(IDeferred<T> handler) { |
|
|||
543 | handler.Resolve(m_result); |
|
|||
544 | } |
|
|||
545 |
|
||||
546 | protected override void SignalError(IDeferred<T> handler, Exception error) { |
|
|||
547 | handler.Reject(error); |
|
|||
548 | } |
|
|||
549 |
|
||||
550 | protected override void SignalCancelled(IDeferred<T> handler, Exception reason) { |
|
|||
551 | handler.Cancel(reason); |
|
|||
552 | } |
|
|||
553 |
|
||||
554 | protected override void Listen(PromiseEventType events, Action handler) { |
|
|||
555 | if (handler != null) |
|
|||
556 | AddHandler(new ListenerDescriptor(handler, events)); |
|
|||
557 | } |
|
|||
558 |
|
||||
559 | #endregion |
|
|||
560 |
|
||||
561 | public static IPromise<T> ResultToPromise(T value) { |
|
|||
562 | var p = new Promise<T>(); |
|
|||
563 | p.Resolve(value); |
|
|||
564 | return p; |
|
|||
565 | } |
|
|||
566 |
|
||||
567 | public static IPromise<T> ExceptionToPromise(Exception error) { |
|
|||
568 | var p = new Promise<T>(); |
|
|||
569 | p.Reject(error); |
|
|||
570 | return p; |
|
|||
571 | } |
|
|||
572 |
|
||||
573 | } |
|
|||
574 | } |
|
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