annotate Implab/PromiseExtensions.cs @ 156:97fbbf816844 v2

Promises: SignalXXX methods merged into SignalHandler method. Components: RunnableComponent In progress
author cin
date Mon, 15 Feb 2016 04:22:15 +0300
parents ec91a6dfa5b3
children 822aab37b107
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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 public static IPromise Then(this IPromise that, Action success, Action<Exception> error, Action<Exception> cancel) {
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179 Safe.ArgumentNotNull(that, "that");
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180
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181 var d = new ActionTask(success, error, cancel, false);
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182 that.On(d.Resolve, d.Reject, d.CancelOperation);
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183 if (success != null)
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184 d.CancellationRequested(that.Cancel);
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185 return d;
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186 }
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187
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188 public static IPromise Then(this IPromise that, Action success, Action<Exception> error) {
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189 return Then(that, success, error, null);
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190 }
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191
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192 public static IPromise Then(this IPromise that, Action success) {
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193 return Then(that, success, null, null);
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194 }
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195
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196 public static IPromise<T> Then<T>(this IPromise that, Func<T> success, Func<Exception, T> error, Func<Exception, T> cancel) {
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197 Safe.ArgumentNotNull(that, "that");
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198
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199 var d = new FuncTask<T>(success, error, cancel, false);
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200 that.On(d.Resolve, d.Reject, d.CancelOperation);
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201 if (success != null)
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202 d.CancellationRequested(that.Cancel);
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203 return d;
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204 }
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205
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206 public static IPromise<T> Then<T>(this IPromise that, Func<T> success, Func<Exception, T> error) {
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207 return Then(that, success, error, null);
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208 }
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209
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210 public static IPromise<T> Then<T>(this IPromise that, Func<T> success) {
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211 return Then(that, success, null, null);
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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, Func<Exception, T2> cancel) {
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215 Safe.ArgumentNotNull(that, "that");
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216 var d = new FuncTask<T,T2>(success, error, cancel, false);
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217 that.On(d.Resolve, d.Reject, d.CancelOperation);
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218 if (success != null)
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219 d.CancellationRequested(that.Cancel);
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220 return d;
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221 }
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222
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223 public static IPromise<T2> Then<T, T2>(this IPromise<T> that, Func<T, T2> success, Func<Exception, T2> error) {
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224 return Then(that, success, error, null);
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225 }
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226
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227 public static IPromise<T2> Then<T, T2>(this IPromise<T> that, Func<T, T2> success) {
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228 return Then(that, success, null, null);
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229 }
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230
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231 #region chain traits
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232 public static IPromise Chain(this IPromise that, Func<IPromise> success, Func<Exception,IPromise> error, Func<Exception,IPromise> cancel) {
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233 Safe.ArgumentNotNull(that, "that");
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234
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235 var d = new ActionChainTask(success, error, cancel, false);
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236 that.On(d.Resolve, d.Reject, d.CancelOperation);
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237 if (success != null)
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238 d.CancellationRequested(that.Cancel);
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239 return d;
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240 }
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241
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242 public static IPromise Chain(this IPromise that, Func<IPromise> success, Func<Exception,IPromise> error) {
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243 return Chain(that, success, error, null);
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244 }
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245
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246 public static IPromise Chain(this IPromise that, Func<IPromise> success) {
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247 return Chain(that, success, null, null);
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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, Func<Exception, IPromise<T>> cancel) {
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251 Safe.ArgumentNotNull(that, "that");
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252
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253 var d = new FuncChainTask<T>(success, error, cancel, false);
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254 that.On(d.Resolve, d.Reject, d.CancelOperation);
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255 if (success != null)
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256 d.CancellationRequested(that.Cancel);
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257 return d;
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258 }
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259
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260 public static IPromise<T> Chain<T>(this IPromise that, Func<IPromise<T>> success, Func<Exception, IPromise<T>> error) {
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261 return Chain(that, success, error, null);
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262 }
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263
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264 public static IPromise<T> Chain<T>(this IPromise that, Func<IPromise<T>> success) {
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265 return Chain(that, success, null, null);
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266 }
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267
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268 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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269 Safe.ArgumentNotNull(that, "that");
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270 var d = new FuncChainTask<T,T2>(success, error, cancel, false);
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271 that.On(d.Resolve, d.Reject, d.CancelOperation);
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272 if (success != null)
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273 d.CancellationRequested(that.Cancel);
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274 return d;
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275 }
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276
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277 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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278 return Chain(that, success, error, null);
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279 }
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280
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281 public static IPromise<T2> Chain<T, T2>(this IPromise<T> that, Func<T, IPromise<T2>> success) {
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282 return Chain(that, success, null, null);
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283 }
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284
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285 #endregion
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286
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287
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288 #if NET_4_5
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289
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290 public static PromiseAwaiter<T> GetAwaiter<T>(this IPromise<T> that) {
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291 Safe.ArgumentNotNull(that, "that");
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292
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293 return new PromiseAwaiter<T>(that);
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294 }
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295
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296 #endif
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297 }
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298 }
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299