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annotate Implab/PromiseExtensions.cs @ 143:16f926ee499d v2

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DRAFT: refactoring, adding cancelation token
author cin
date Wed, 04 Mar 2015 18:05:39 +0300
parents f75cfa58e3d4
children 706fccb85524
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 using System.Threading;
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2 using System;
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3 using Implab.Diagnostics;
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4 using System.Collections.Generic;
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5
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6
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7 #if NET_4_5
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8 using System.Threading.Tasks;
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9 #endif
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10
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11 namespace Implab {
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12 public static class PromiseExtensions {
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13 public static IPromise<T> DispatchToCurrentContext<T>(this IPromise<T> that) {
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14 Safe.ArgumentNotNull(that, "that");
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15 var context = SynchronizationContext.Current;
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16 if (context == null)
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17 return that;
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18
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19 var p = new SyncContextPromise<T>(context);
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20 p.On(that.Cancel, PromiseEventType.Cancelled);
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21
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22 that.On(
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23 p.Resolve,
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24 p.Reject,
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25 p.Cancel
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26 );
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27 return p;
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28 }
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29
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30 public static IPromise<T> DispatchToContext<T>(this IPromise<T> that, SynchronizationContext context) {
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31 Safe.ArgumentNotNull(that, "that");
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32 Safe.ArgumentNotNull(context, "context");
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33
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34 var p = new SyncContextPromise<T>(context);
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35 p.On(that.Cancel, PromiseEventType.Cancelled);
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36
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37
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38 that.On(
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39 p.Resolve,
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40 p.Reject,
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41 p.Cancel
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42 );
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43 return p;
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44 }
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45
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46 /// <summary>
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47 /// Ensures the dispatched.
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48 /// </summary>
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49 /// <returns>The dispatched.</returns>
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50 /// <param name="that">That.</param>
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51 /// <param name="head">Head.</param>
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52 /// <param name="cleanup">Cleanup.</param>
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53 /// <typeparam name="TPromise">The 1st type parameter.</typeparam>
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54 /// <typeparam name="T">The 2nd type parameter.</typeparam>
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55 public static TPromise EnsureDispatched<TPromise,T>(this TPromise that, IPromise<T> head, Action<T> cleanup) where TPromise : IPromise{
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56 Safe.ArgumentNotNull(that, "that");
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57 Safe.ArgumentNotNull(head, "head");
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58
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59 that.On(() => head.On(cleanup), PromiseEventType.Cancelled);
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60
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61 return that;
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62 }
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63
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64 public static AsyncCallback AsyncCallback<T>(this Promise<T> that, Func<IAsyncResult,T> callback) {
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65 Safe.ArgumentNotNull(that, "that");
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66 Safe.ArgumentNotNull(callback, "callback");
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67 var op = TraceContext.Instance.CurrentOperation;
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68 return ar => {
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69 TraceContext.Instance.EnterLogicalOperation(op,false);
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70 try {
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71 that.Resolve(callback(ar));
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72 } catch (Exception err) {
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73 that.Reject(err);
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74 } finally {
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75 TraceContext.Instance.Leave();
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76 }
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77 };
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78 }
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79
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80 static void CancelCallback(object cookie) {
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81 ((ICancellable)cookie).Cancel();
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82 }
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83
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84 /// <summary>
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85 /// Cancells promise after the specified timeout is elapsed.
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86 /// </summary>
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87 /// <param name="that">The promise to cancel on timeout.</param>
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88 /// <param name="milliseconds">The timeout in milliseconds.</param>
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89 /// <typeparam name="TPromise">The 1st type parameter.</typeparam>
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90 public static TPromise Timeout<TPromise>(this TPromise that, int milliseconds) where TPromise : IPromise {
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91 Safe.ArgumentNotNull(that, "that");
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92 var timer = new Timer(CancelCallback, that, milliseconds, -1);
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93 that.On(timer.Dispose, PromiseEventType.All);
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94 return that;
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95 }
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96
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97 public static IPromise Bundle(this ICollection<IPromise> that) {
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98 Safe.ArgumentNotNull(that, "that");
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99
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100 int count = that.Count;
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101 int errors = 0;
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102 var medium = new Promise();
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103
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104 if (count == 0) {
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105 medium.Resolve();
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106 return medium;
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107 }
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108
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109 medium.On(() => {
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110 foreach(var p2 in that)
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111 p2.Cancel();
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112 }, PromiseEventType.ErrorOrCancel);
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113
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114 foreach (var p in that)
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115 p.On(
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116 () => {
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117 if (Interlocked.Decrement(ref count) == 0)
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118 medium.Resolve();
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119 },
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120 error => {
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121 if (Interlocked.Increment(ref errors) == 1)
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122 medium.Reject(
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123 new Exception("The dependency promise is failed", error)
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124 );
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125 },
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126 reason => {
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127 if (Interlocked.Increment(ref errors) == 1)
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128 medium.Cancel(
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129 new Exception("The dependency promise is cancelled")
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130 );
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131 }
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132 );
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133
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134 return medium;
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135 }
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136
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137 public static IPromise<T[]> Bundle<T>(this ICollection<IPromise<T>> that) {
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138 Safe.ArgumentNotNull(that, "that");
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139
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140 int count = that.Count;
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141 int errors = 0;
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142 var medium = new Promise<T[]>();
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143 var results = new T[that.Count];
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144
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145 medium.On(() => {
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146 foreach(var p2 in that)
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147 p2.Cancel();
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148 }, PromiseEventType.ErrorOrCancel);
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149
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150 int i = 0;
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151 foreach (var p in that) {
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152 var idx = i;
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153 p.On(
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154 x => {
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155 results[idx] = x;
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156 if (Interlocked.Decrement(ref count) == 0)
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157 medium.Resolve(results);
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158 },
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159 error => {
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160 if (Interlocked.Increment(ref errors) == 1)
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161 medium.Reject(
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162 new Exception("The dependency promise is failed", error)
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163 );
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164 },
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165 reason => {
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166 if (Interlocked.Increment(ref errors) == 1)
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167 medium.Cancel(
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168 new Exception("The dependency promise is cancelled", reason)
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169 );
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170 }
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171 );
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172 i++;
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173 }
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174
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175 return medium;
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176 }
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177
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178 #if NET_4_5
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179
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180 public static Task<T> GetTask<T>(this IPromise<T> that) {
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181 Safe.ArgumentNotNull(that, "that");
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182 var tcs = new TaskCompletionSource<T>();
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183
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184 that.On(tcs.SetResult, tcs.SetException, r => tcs.SetCanceled());
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185
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186 return tcs.Task;
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187 }
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188
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189 #endif
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190 }
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191 }
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192