annotate Implab/PromiseExtensions.cs @ 195:ea485487a424 v2

minor changes
author cin
date Wed, 04 May 2016 12:28:08 +0300
parents 822aab37b107
children 8200ab154c8a
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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 namespace Implab {
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7 public static class PromiseExtensions {
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8 public static IPromise<T> DispatchToCurrentContext<T>(this IPromise<T> that) {
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9 Safe.ArgumentNotNull(that, "that");
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10 var context = SynchronizationContext.Current;
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11 if (context == null)
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12 return that;
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13
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14 var p = new SyncContextPromise<T>(context);
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15 p.CancellationRequested(that.Cancel);
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16
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17 that.On(
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18 p.Resolve,
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19 p.Reject,
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20 p.CancelOperation
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21 );
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22 return p;
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23 }
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24
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25 public static IPromise<T> DispatchToContext<T>(this IPromise<T> that, SynchronizationContext context) {
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26 Safe.ArgumentNotNull(that, "that");
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27 Safe.ArgumentNotNull(context, "context");
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28
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29 var p = new SyncContextPromise<T>(context);
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30 p.CancellationRequested(that.Cancel);
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31
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32 that.On(
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33 p.Resolve,
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34 p.Reject,
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35 p.CancelOperation
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36 );
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37 return p;
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38 }
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39
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40 /// <summary>
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41 /// Ensures the dispatched.
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42 /// </summary>
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43 /// <returns>The dispatched.</returns>
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44 /// <param name="that">That.</param>
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45 /// <param name="head">Head.</param>
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46 /// <param name="cleanup">Cleanup.</param>
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47 /// <typeparam name="TPromise">The 1st type parameter.</typeparam>
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48 /// <typeparam name="T">The 2nd type parameter.</typeparam>
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49 public static TPromise EnsureDispatched<TPromise,T>(this TPromise that, IPromise<T> head, Action<T> cleanup) where TPromise : IPromise{
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50 Safe.ArgumentNotNull(that, "that");
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51 Safe.ArgumentNotNull(head, "head");
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52
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53 that.On(() => head.On(cleanup), PromiseEventType.Cancelled);
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54
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55 return that;
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56 }
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57
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58 public static AsyncCallback AsyncCallback<T>(this Promise<T> that, Func<IAsyncResult,T> callback) {
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59 Safe.ArgumentNotNull(that, "that");
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60 Safe.ArgumentNotNull(callback, "callback");
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61 var op = TraceContext.Instance.CurrentOperation;
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62 return ar => {
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63 TraceContext.Instance.EnterLogicalOperation(op,false);
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64 try {
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65 that.Resolve(callback(ar));
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66 } catch (Exception err) {
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67 that.Reject(err);
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68 } finally {
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69 TraceContext.Instance.Leave();
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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 static void CancelByTimeoutCallback(object cookie) {
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75 ((ICancellable)cookie).Cancel(new TimeoutException());
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76 }
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78 /// <summary>
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79 /// Cancells promise after the specified timeout is elapsed.
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80 /// </summary>
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81 /// <param name="that">The promise to cancel on timeout.</param>
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82 /// <param name="milliseconds">The timeout in milliseconds.</param>
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83 /// <typeparam name="TPromise">The 1st type parameter.</typeparam>
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84 public static TPromise Timeout<TPromise>(this TPromise that, int milliseconds) where TPromise : IPromise {
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85 Safe.ArgumentNotNull(that, "that");
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86 var timer = new Timer(CancelByTimeoutCallback, that, milliseconds, -1);
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87 that.On(timer.Dispose, PromiseEventType.All);
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88 return that;
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89 }
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90
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91 public static IPromise Bundle(this ICollection<IPromise> that) {
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92 Safe.ArgumentNotNull(that, "that");
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93
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94 int count = that.Count;
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95 int errors = 0;
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96 var medium = new Promise();
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97
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98 if (count == 0) {
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99 medium.Resolve();
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100 return medium;
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101 }
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102
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103 medium.On(() => {
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104 foreach(var p2 in that)
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105 p2.Cancel();
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106 }, PromiseEventType.ErrorOrCancel);
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107
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108 foreach (var p in that)
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109 p.On(
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110 () => {
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111 if (Interlocked.Decrement(ref count) == 0)
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112 medium.Resolve();
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113 },
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114 error => {
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115 if (Interlocked.Increment(ref errors) == 1)
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116 medium.Reject(
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117 new Exception("The dependency promise is failed", error)
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118 );
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119 },
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120 reason => {
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121 if (Interlocked.Increment(ref errors) == 1)
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122 medium.Cancel(
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123 new Exception("The dependency promise is cancelled")
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124 );
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125 }
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126 );
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127
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128 return medium;
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129 }
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130
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131 public static IPromise<T[]> Bundle<T>(this ICollection<IPromise<T>> that) {
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132 Safe.ArgumentNotNull(that, "that");
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133
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134 int count = that.Count;
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135 int errors = 0;
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136 var medium = new Promise<T[]>();
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137 var results = new T[that.Count];
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138
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139 medium.On(() => {
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140 foreach(var p2 in that)
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141 p2.Cancel();
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142 }, PromiseEventType.ErrorOrCancel);
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143
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144 int i = 0;
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145 foreach (var p in that) {
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146 var idx = i;
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147 p.On(
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148 x => {
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149 results[idx] = x;
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150 if (Interlocked.Decrement(ref count) == 0)
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151 medium.Resolve(results);
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152 },
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153 error => {
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154 if (Interlocked.Increment(ref errors) == 1)
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155 medium.Reject(
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156 new Exception("The dependency promise is failed", error)
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157 );
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158 },
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159 reason => {
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160 if (Interlocked.Increment(ref errors) == 1)
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161 medium.Cancel(
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162 new Exception("The dependency promise is cancelled", reason)
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163 );
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164 }
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165 );
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166 i++;
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167 }
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168
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169 return medium;
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170 }
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171
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172 public static IPromise Then(this IPromise that, Action success, Action<Exception> error, Action<Exception> cancel) {
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173 Safe.ArgumentNotNull(that, "that");
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174
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175 var d = new ActionTask(success, error, cancel, false);
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176 that.On(d.Resolve, d.Reject, d.CancelOperation);
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177 d.CancellationRequested(that.Cancel);
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178 return d;
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179 }
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180
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181 public static IPromise Then(this IPromise that, Action success, Action<Exception> error) {
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182 return Then(that, success, error, null);
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183 }
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184
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185 public static IPromise Then(this IPromise that, Action success) {
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186 return Then(that, success, null, null);
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187 }
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188
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189 public static IPromise<T> Then<T>(this IPromise that, Func<T> success, Func<Exception, T> error, Func<Exception, T> cancel) {
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190 Safe.ArgumentNotNull(that, "that");
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191
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192 var d = new FuncTask<T>(success, error, cancel, false);
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193 that.On(d.Resolve, d.Reject, d.CancelOperation);
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194 d.CancellationRequested(that.Cancel);
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195 return d;
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196 }
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197
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198 public static IPromise<T> Then<T>(this IPromise that, Func<T> success, Func<Exception, T> error) {
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199 return Then(that, success, error, null);
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200 }
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201
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202 public static IPromise<T> Then<T>(this IPromise that, Func<T> success) {
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203 return Then(that, success, null, null);
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204 }
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205
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206 public static IPromise<T2> Then<T, T2>(this IPromise<T> that, Func<T, T2> success, Func<Exception, T2> error, Func<Exception, T2> cancel) {
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207 Safe.ArgumentNotNull(that, "that");
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208 var d = new FuncTask<T,T2>(success, error, cancel, false);
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209 that.On(d.Resolve, d.Reject, d.CancelOperation);
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210 d.CancellationRequested(that.Cancel);
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211 return d;
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212 }
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213
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214 public static IPromise<T2> Then<T, T2>(this IPromise<T> that, Func<T, T2> success, Func<Exception, T2> error) {
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215 return Then(that, success, error, null);
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216 }
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217
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218 public static IPromise<T2> Then<T, T2>(this IPromise<T> that, Func<T, T2> success) {
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219 return Then(that, success, null, null);
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220 }
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221
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222 #region chain traits
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223 public static IPromise Chain(this IPromise that, Func<IPromise> success, Func<Exception,IPromise> error, Func<Exception,IPromise> cancel) {
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224 Safe.ArgumentNotNull(that, "that");
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225
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226 var d = new ActionChainTask(success, error, cancel, false);
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227 that.On(d.Resolve, d.Reject, d.CancelOperation);
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228 d.CancellationRequested(that.Cancel);
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229 return d;
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230 }
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231
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232 public static IPromise Chain(this IPromise that, Func<IPromise> success, Func<Exception,IPromise> error) {
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233 return Chain(that, success, error, null);
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234 }
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235
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236 public static IPromise Chain(this IPromise that, Func<IPromise> success) {
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237 return Chain(that, success, null, null);
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238 }
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239
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240 public static IPromise<T> Chain<T>(this IPromise that, Func<IPromise<T>> success, Func<Exception, IPromise<T>> error, Func<Exception, IPromise<T>> cancel) {
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241 Safe.ArgumentNotNull(that, "that");
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242
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243 var d = new FuncChainTask<T>(success, error, cancel, false);
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244 that.On(d.Resolve, d.Reject, d.CancelOperation);
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245 if (success != null)
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246 d.CancellationRequested(that.Cancel);
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247 return d;
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248 }
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249
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250 public static IPromise<T> Chain<T>(this IPromise that, Func<IPromise<T>> success, Func<Exception, IPromise<T>> error) {
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251 return Chain(that, success, error, null);
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252 }
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253
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254 public static IPromise<T> Chain<T>(this IPromise that, Func<IPromise<T>> success) {
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255 return Chain(that, success, null, null);
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256 }
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257
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258 public static IPromise<T2> Chain<T, T2>(this IPromise<T> that, Func<T, IPromise<T2>> success, Func<Exception, IPromise<T2>> error, Func<Exception, IPromise<T2>> cancel) {
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259 Safe.ArgumentNotNull(that, "that");
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260 var d = new FuncChainTask<T,T2>(success, error, cancel, false);
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261 that.On(d.Resolve, d.Reject, d.CancelOperation);
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262 if (success != null)
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263 d.CancellationRequested(that.Cancel);
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264 return d;
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265 }
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266
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267 public static IPromise<T2> Chain<T, T2>(this IPromise<T> that, Func<T, IPromise<T2>> success, Func<Exception, IPromise<T2>> error) {
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268 return Chain(that, success, error, null);
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269 }
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270
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271 public static IPromise<T2> Chain<T, T2>(this IPromise<T> that, Func<T, IPromise<T2>> success) {
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272 return Chain(that, success, null, null);
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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
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278 #if NET_4_5
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279
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280 public static PromiseAwaiter<T> GetAwaiter<T>(this IPromise<T> that) {
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281 Safe.ArgumentNotNull(that, "that");
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282
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283 return new PromiseAwaiter<T>(that);
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284 }
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285
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286 #endif
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287 }
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288 }
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289