Mercurial > pub > ImplabNet

annotate Implab/Promise.cs @ 128:6241bff0cd64 v2

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Added Signal class a lightweight alternative to ManualResetEvent
author cin
date Thu, 29 Jan 2015 05:09:31 +0300
parents 2573b562e328
children f75cfa58e3d4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 using System;
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2 using System.Diagnostics;
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3
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4 namespace Implab {
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5 public class Promise : AbstractPromise<Promise.HandlerDescriptor>, IPromise, IDeferred {
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6
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7 public struct HandlerDescriptor {
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8 readonly Action m_success;
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9 readonly Action<Exception> m_error;
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10 readonly Action m_cancel;
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11 readonly IDeferred m_deferred;
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12
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13 public HandlerDescriptor(Action success, Action<Exception> error, Action cancel, IDeferred deferred) {
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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 m_deferred = deferred;
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18 }
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19
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20 public void SignalSuccess() {
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21 if (m_success != null) {
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22 try {
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23 m_success();
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24 if (m_deferred != null)
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25 m_deferred.Resolve();
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26 } catch (Exception err) {
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27 SignalError(err);
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28 }
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29 }
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30 }
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31
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32 public void SignalError(Exception err) {
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33 if (m_error != null) {
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34 try {
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35 m_error(err);
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36 if (m_deferred != null)
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37 m_deferred.Resolve();
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38 } catch (Exception err2) {
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39 if (m_deferred != null)
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40 m_deferred.Reject(err2);
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41 }
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42 } else {
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43 if (m_deferred != null)
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44 m_deferred.Reject(err);
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45 }
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46 }
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47
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48 public void SignalCancel() {
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49 if (m_cancel != null) {
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50 try {
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51 m_cancel();
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52 if (m_deferred != null)
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53 m_deferred.Resolve();
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54 } catch (Exception err) {
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55 SignalError(err);
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56 }
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57 } else {
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58 if (m_deferred != null)
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59 m_deferred.Cancel();
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60 }
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61 }
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62 }
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63
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64 public void Resolve() {
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65 BeginSetResult();
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66 EndSetResult();
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67 }
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68
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69 public void Reject(Exception error) {
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70 SetError(error);
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71 }
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72
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73 #region implemented abstract members of AbstractPromise
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74
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75 protected override void SignalSuccess(HandlerDescriptor handler) {
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76 handler.SignalSuccess();
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77 }
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78
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79 protected override void SignalError(HandlerDescriptor handler, Exception error) {
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80 handler.SignalError(error);
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81 }
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82
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83 protected override void SignalCancelled(HandlerDescriptor handler) {
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84 handler.SignalCancel();
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85 }
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86
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87 protected override void Listen(PromiseEventType events, Action handler) {
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88 AddHandler(new HandlerDescriptor(
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89 events.HasFlag(PromiseEventType.Success) ? handler : null,
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90 events.HasFlag(PromiseEventType.Error) ? new Action<Exception>(err => handler()) : null,
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91 events.HasFlag(PromiseEventType.Cancelled) ? handler : null,
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92 null
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93 ));
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94 }
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95
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96 #endregion
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97
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98
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99 public Type PromiseType {
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100 get {
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101 return typeof(void);
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102 }
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103 }
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104
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105 public IPromise Then(Action success, Action<Exception> error, Action cancel) {
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106 var promise = new Promise();
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107 if (success != null)
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108 promise.On(Cancel, PromiseEventType.Cancelled);
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109
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110 AddHandler(new HandlerDescriptor(success, error, cancel, promise));
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111
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112 return promise;
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113 }
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114
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115 public IPromise Then(Action success, Action<Exception> error) {
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116 return Then(success, error, null);
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117 }
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118
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119 public IPromise Then(Action success) {
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120 return Then(success, null, null);
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121 }
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122
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123 public IPromise On(Action success, Action<Exception> error, Action cancel) {
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124 AddHandler(new HandlerDescriptor(success, error, cancel, null));
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125 return this;
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126 }
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127
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128 public IPromise On(Action success, Action<Exception> error) {
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129 return On(success, error, null);
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130 }
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131
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132 public IPromise On(Action success) {
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133 return On(success, null, null);
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134 }
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135
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136 public IPromise On(Action handler, PromiseEventType events) {
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137 return On(
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138 events.HasFlag(PromiseEventType.Success) ? handler : null,
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139 events.HasFlag(PromiseEventType.Error) ? new Action<Exception>(err => handler()) : null,
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140 events.HasFlag(PromiseEventType.Cancelled) ? handler : null
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141 );
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142 }
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143
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144 public IPromise<T> Cast<T>() {
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145 throw new InvalidCastException();
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146 }
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147
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148 public IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error, Func<IPromise> cancel) {
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149 var medium = new Promise();
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150
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151 On(
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152 () => {
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153 if (medium.IsCancelled)
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154 return;
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155 if (chained != null)
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156 ConnectPromise(chained(), medium);
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157 },
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158 ex => {
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159 if (medium.IsCancelled)
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160 return;
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161 if (error != null) {
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162 try {
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163 ConnectPromise(error(ex), medium);
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164 } catch (Exception ex2) {
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165 medium.Reject(ex2);
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166 }
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167 } else {
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168 medium.Reject(ex);
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169 }
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170 },
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171 () => {
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172 if (medium.IsCancelled)
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173 return;
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174 if (cancel != null)
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175 ConnectPromise(cancel(), medium);
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176 else
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177 medium.Cancel();
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178 }
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179 );
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180
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181 if (chained != null)
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182 medium.On(Cancel, PromiseEventType.Cancelled);
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183
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184 return medium;
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185 }
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186
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187 static void ConnectPromise(IPromise result, Promise medium) {
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188 if (result != null) {
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189 result.On(
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190 medium.Resolve,
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191 medium.Reject,
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192 () => medium.Reject(new OperationCanceledException())
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193 );
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194 medium.On(result.Cancel, PromiseEventType.Cancelled);
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195 } else {
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196 medium.Reject(
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197 new NullReferenceException(
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198 "The chained asynchronous operation returned" +
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199 " 'null' where the promise instance is expected"
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200 )
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201 );
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202 }
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203 }
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204
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205 public IPromise Chain(Func<IPromise> chained, Func<Exception, IPromise> error) {
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206 return Chain(chained, error, null);
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207 }
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208
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209 public IPromise Chain(Func<IPromise> chained) {
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210 return Chain(chained, null, null);
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211 }
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212
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213 public IPromise Error(Action<Exception> error) {
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214 var promise = new Promise();
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215 On(
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216 null,
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217 err => {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
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218 if (error != null)
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219 try {
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220 error(err);
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221 promise.Resolve();
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222 } catch (Exception err2) {
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223 promise.Reject(err2);
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224 }
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225 else
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226 promise.Reject(err);
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227 }
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228 );
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229
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230 return promise;
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231 }
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232
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233 public IPromise Cancelled(Action handler) {
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234 var promise = new Promise();
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235 On(
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236 null,
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237 null,
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238 () => {
2573b562e328 Promises rewritten, added improved version of AsyncQueue
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239 if (handler != null) {
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240 try {
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241 handler();
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242 promise.Resolve();
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243 } catch (Exception err) {
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244 promise.Reject(err);
2573b562e328 Promises rewritten, added improved version of AsyncQueue
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245 }
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246 } else {
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247 promise.Cancel();
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248 }
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249 }
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250 );
2573b562e328 Promises rewritten, added improved version of AsyncQueue
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251
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252 return promise;
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253 }
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254
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255
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256 }
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257 }
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258