Mercurial > pub > ImplabNet
annotate Implab/PromiseExtensions.cs @ 210:5dc21f6a3222 v2
Code review for RunnableComponent
Added StaApartment class based on System.Windows.Forms.Application message loop
author | cin |
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date | Mon, 20 Mar 2017 17:44:18 +0300 |
parents | a867536c68fc |
children | 5cb4826c2c2a |
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72 | 1 using System.Threading; |
75 | 2 using System; |
109 | 3 using Implab.Diagnostics; |
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4 using System.Collections.Generic; |
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5 using System.Linq; |
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6 |
72 | 7 namespace Implab { |
8 public static class PromiseExtensions { | |
9 public static IPromise<T> DispatchToCurrentContext<T>(this IPromise<T> that) { | |
75 | 10 Safe.ArgumentNotNull(that, "that"); |
72 | 11 var context = SynchronizationContext.Current; |
12 if (context == null) | |
13 return that; | |
14 | |
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15 var p = new SyncContextPromise<T>(context); |
185 | 16 p.CancellationRequested(that.Cancel); |
72 | 17 |
104 | 18 that.On( |
76 | 19 p.Resolve, |
20 p.Reject, | |
185 | 21 p.CancelOperation |
72 | 22 ); |
23 return p; | |
24 } | |
25 | |
26 public static IPromise<T> DispatchToContext<T>(this IPromise<T> that, SynchronizationContext context) { | |
75 | 27 Safe.ArgumentNotNull(that, "that"); |
72 | 28 Safe.ArgumentNotNull(context, "context"); |
29 | |
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30 var p = new SyncContextPromise<T>(context); |
185 | 31 p.CancellationRequested(that.Cancel); |
72 | 32 |
104 | 33 that.On( |
76 | 34 p.Resolve, |
35 p.Reject, | |
185 | 36 p.CancelOperation |
72 | 37 ); |
38 return p; | |
39 } | |
75 | 40 |
101 | 41 /// <summary> |
42 /// Ensures the dispatched. | |
43 /// </summary> | |
44 /// <returns>The dispatched.</returns> | |
45 /// <param name="that">That.</param> | |
46 /// <param name="head">Head.</param> | |
47 /// <param name="cleanup">Cleanup.</param> | |
48 /// <typeparam name="TPromise">The 1st type parameter.</typeparam> | |
49 /// <typeparam name="T">The 2nd type parameter.</typeparam> | |
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50 public static TPromise EnsureDispatched<TPromise, T>(this TPromise that, IPromise<T> head, Action<T> cleanup) where TPromise : IPromise { |
101 | 51 Safe.ArgumentNotNull(that, "that"); |
52 Safe.ArgumentNotNull(head, "head"); | |
53 | |
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54 that.On(() => head.On(cleanup), PromiseEventType.Cancelled); |
101 | 55 |
56 return that; | |
57 } | |
58 | |
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59 /// <summary> |
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60 /// Adds a cancellation point to the chain of promises. When a cancellation request reaches the cancellation point the operation is |
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61 /// cancelled immediatelly, and the request is passed towards. If the operation at the higher level can not be cancelled is't result |
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62 /// will be collected with <paramref name="cleanup"/> callback. |
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63 /// </summary> |
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64 /// <typeparam name="T">The type of the promise result.</typeparam> |
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65 /// <param name="that">The promise to which the cancellation point should be attached.</param> |
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66 /// <param name="cleanup">The callback which is used to cleanup the result of the operation if the cancellation point is cancelled already.</param> |
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67 /// <returns>The promise</returns> |
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68 public static IPromise<T> CancellationPoint<T>(this IPromise<T> that, Action<T> cleanup) { |
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69 var meduim = new Promise<T>(); |
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70 |
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71 that.On(meduim.Resolve, meduim.Reject, meduim.CancelOperation); |
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72 |
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73 meduim.CancellationRequested(that.Cancel); |
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74 meduim.CancellationRequested(meduim.CancelOperation); |
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75 |
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76 if (cleanup != null) |
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77 meduim.On((Action<T>)null, null, (e) => { |
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78 that.On(cleanup); |
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79 }); |
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80 |
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81 return meduim; |
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82 } |
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83 |
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84 public static AsyncCallback AsyncCallback<T>(this Promise<T> that, Func<IAsyncResult, T> callback) { |
75 | 85 Safe.ArgumentNotNull(that, "that"); |
86 Safe.ArgumentNotNull(callback, "callback"); | |
109 | 87 var op = TraceContext.Instance.CurrentOperation; |
75 | 88 return ar => { |
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89 TraceContext.Instance.EnterLogicalOperation(op, false); |
75 | 90 try { |
91 that.Resolve(callback(ar)); | |
92 } catch (Exception err) { | |
93 that.Reject(err); | |
109 | 94 } finally { |
95 TraceContext.Instance.Leave(); | |
75 | 96 } |
97 }; | |
98 } | |
110 | 99 |
185 | 100 static void CancelByTimeoutCallback(object cookie) { |
101 ((ICancellable)cookie).Cancel(new TimeoutException()); | |
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102 } |
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103 |
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104 /// <summary> |
110 | 105 /// Cancells promise after the specified timeout is elapsed. |
106 /// </summary> | |
107 /// <param name="that">The promise to cancel on timeout.</param> | |
108 /// <param name="milliseconds">The timeout in milliseconds.</param> | |
109 /// <typeparam name="TPromise">The 1st type parameter.</typeparam> | |
110 public static TPromise Timeout<TPromise>(this TPromise that, int milliseconds) where TPromise : IPromise { | |
111 Safe.ArgumentNotNull(that, "that"); | |
185 | 112 var timer = new Timer(CancelByTimeoutCallback, that, milliseconds, -1); |
110 | 113 that.On(timer.Dispose, PromiseEventType.All); |
114 return that; | |
115 } | |
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116 |
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117 public static IPromise PromiseAll(this IEnumerable<IPromise> that) { |
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118 Safe.ArgumentNotNull(that, "that"); |
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119 return PromiseAll(that.ToList()); |
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120 } |
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121 |
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122 public static IPromise<T[]> PromiseAll<T>(this IEnumerable<IPromise<T>> that) { |
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123 return PromiseAll(that, null); |
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124 } |
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125 |
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126 public static IPromise<T[]> PromiseAll<T>(this IEnumerable<IPromise<T>> that, Action<T> cleanup) { |
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127 Safe.ArgumentNotNull(that, "that"); |
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128 return PromiseAll(that.ToList(), cleanup); |
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129 } |
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130 |
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131 public static IPromise PromiseAll(this ICollection<IPromise> that) { |
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132 Safe.ArgumentNotNull(that, "that"); |
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133 |
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134 int count = that.Count; |
124 | 135 int errors = 0; |
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136 var medium = new Promise(); |
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137 |
136 | 138 if (count == 0) { |
139 medium.Resolve(); | |
140 return medium; | |
141 } | |
142 | |
124 | 143 medium.On(() => { |
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144 foreach (var p2 in that) |
124 | 145 p2.Cancel(); |
146 }, PromiseEventType.ErrorOrCancel); | |
147 | |
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148 foreach (var p in that) |
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149 p.On( |
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150 () => { |
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151 if (Interlocked.Decrement(ref count) == 0) |
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152 medium.Resolve(); |
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153 }, |
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154 error => { |
124 | 155 if (Interlocked.Increment(ref errors) == 1) |
156 medium.Reject( | |
157 new Exception("The dependency promise is failed", error) | |
158 ); | |
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159 }, |
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160 reason => { |
124 | 161 if (Interlocked.Increment(ref errors) == 1) |
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162 medium.Cancel( |
124 | 163 new Exception("The dependency promise is cancelled") |
164 ); | |
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165 } |
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166 ); |
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167 |
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168 return medium; |
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169 } |
124 | 170 |
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171 public static IPromise<T[]> PromiseAll<T>(this ICollection<IPromise<T>> that) { |
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172 return PromiseAll(that, null); |
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173 } |
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174 |
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175 /// <summary> |
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176 /// Creates a new promise which will be satisfied when all promises are satisfied. |
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177 /// </summary> |
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178 /// <typeparam name="T"></typeparam> |
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179 /// <param name="that"></param> |
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180 /// <param name="cleanup">A callback used to cleanup already resolved promises in case of an error</param> |
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181 /// <returns></returns> |
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182 public static IPromise<T[]> PromiseAll<T>(this ICollection<IPromise<T>> that, Action<T> cleanup) { |
209 | 183 Safe.ArgumentNotNull(that, "that"); |
184 | |
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185 int count = that.Count; |
124 | 186 |
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187 if (count == 0) |
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188 return Promise<T[]>.FromResult(new T[0]); |
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189 |
124 | 190 int errors = 0; |
191 var medium = new Promise<T[]>(); | |
192 var results = new T[that.Count]; | |
193 | |
194 medium.On(() => { | |
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195 foreach (var p2 in that) { |
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196 p2.Cancel(); |
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197 if (cleanup != null) |
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198 p2.On(cleanup); |
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199 } |
124 | 200 }, PromiseEventType.ErrorOrCancel); |
201 | |
202 int i = 0; | |
203 foreach (var p in that) { | |
204 var idx = i; | |
205 p.On( | |
206 x => { | |
207 results[idx] = x; | |
208 if (Interlocked.Decrement(ref count) == 0) | |
209 medium.Resolve(results); | |
210 }, | |
211 error => { | |
212 if (Interlocked.Increment(ref errors) == 1) | |
213 medium.Reject( | |
214 new Exception("The dependency promise is failed", error) | |
215 ); | |
216 }, | |
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217 reason => { |
124 | 218 if (Interlocked.Increment(ref errors) == 1) |
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219 medium.Cancel( |
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220 new Exception("The dependency promise is cancelled", reason) |
124 | 221 ); |
222 } | |
223 ); | |
224 i++; | |
225 } | |
226 | |
227 return medium; | |
228 } | |
145 | 229 |
230 public static IPromise Then(this IPromise that, Action success, Action<Exception> error, Action<Exception> cancel) { | |
231 Safe.ArgumentNotNull(that, "that"); | |
232 | |
149 | 233 var d = new ActionTask(success, error, cancel, false); |
145 | 234 that.On(d.Resolve, d.Reject, d.CancelOperation); |
185 | 235 d.CancellationRequested(that.Cancel); |
145 | 236 return d; |
237 } | |
238 | |
239 public static IPromise Then(this IPromise that, Action success, Action<Exception> error) { | |
240 return Then(that, success, error, null); | |
241 } | |
242 | |
243 public static IPromise Then(this IPromise that, Action success) { | |
244 return Then(that, success, null, null); | |
245 } | |
246 | |
247 public static IPromise<T> Then<T>(this IPromise that, Func<T> success, Func<Exception, T> error, Func<Exception, T> cancel) { | |
248 Safe.ArgumentNotNull(that, "that"); | |
249 | |
149 | 250 var d = new FuncTask<T>(success, error, cancel, false); |
145 | 251 that.On(d.Resolve, d.Reject, d.CancelOperation); |
185 | 252 d.CancellationRequested(that.Cancel); |
145 | 253 return d; |
254 } | |
255 | |
256 public static IPromise<T> Then<T>(this IPromise that, Func<T> success, Func<Exception, T> error) { | |
257 return Then(that, success, error, null); | |
258 } | |
259 | |
260 public static IPromise<T> Then<T>(this IPromise that, Func<T> success) { | |
261 return Then(that, success, null, null); | |
262 } | |
263 | |
264 public static IPromise<T2> Then<T, T2>(this IPromise<T> that, Func<T, T2> success, Func<Exception, T2> error, Func<Exception, T2> cancel) { | |
265 Safe.ArgumentNotNull(that, "that"); | |
209 | 266 Safe.ArgumentNotNull(success, "success"); |
267 | |
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268 var d = new FuncTask<T, T2>(success, error, cancel, false); |
145 | 269 that.On(d.Resolve, d.Reject, d.CancelOperation); |
185 | 270 d.CancellationRequested(that.Cancel); |
145 | 271 return d; |
272 } | |
273 | |
207
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274 public static IPromise<T> Then<T>(this IPromise<T> that, Action<T> success, Func<Exception, T> error, Func<Exception, T> cancel) { |
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275 Safe.ArgumentNotNull(that, "that"); |
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276 var d = new FuncTask<T, T>( |
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277 x => { |
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278 success(x); |
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279 return x; |
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280 }, |
209 | 281 error, |
282 cancel, | |
207
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283 false |
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284 ); |
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285 that.On(d.Resolve, d.Reject, d.CancelOperation); |
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286 d.CancellationRequested(that.Cancel); |
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287 return d; |
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288 } |
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289 |
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290 public static IPromise<T> Then<T>(this IPromise<T> that, Action<T> success, Func<Exception, T> error) { |
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291 return Then(that, success, error, null); |
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292 } |
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293 |
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294 public static IPromise<T> Then<T>(this IPromise<T> that, Action<T> success) { |
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295 return Then(that, success, null, null); |
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296 } |
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297 |
145 | 298 public static IPromise<T2> Then<T, T2>(this IPromise<T> that, Func<T, T2> success, Func<Exception, T2> error) { |
299 return Then(that, success, error, null); | |
300 } | |
301 | |
302 public static IPromise<T2> Then<T, T2>(this IPromise<T> that, Func<T, T2> success) { | |
303 return Then(that, success, null, null); | |
304 } | |
305 | |
207
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306 public static IPromise<T> Always<T>(this IPromise<T> that, Action handler) { |
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307 Func<Exception, T> errorOrCancel; |
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308 if (handler != null) |
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309 errorOrCancel = e => { |
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310 handler(); |
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311 throw new PromiseTransientException(e); |
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312 }; |
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313 else |
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314 errorOrCancel = null; |
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315 |
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316 return Then( |
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317 that, |
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318 x => { |
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319 handler(); |
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320 return x; |
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321 }, |
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322 errorOrCancel, |
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323 errorOrCancel); |
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324 } |
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325 |
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326 public static IPromise Always(this IPromise that, Action handler) { |
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327 Action<Exception> errorOrCancel; |
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328 if (handler != null) |
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329 errorOrCancel = e => { |
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330 handler(); |
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331 throw new PromiseTransientException(e); |
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332 }; |
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333 else |
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334 errorOrCancel = null; |
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335 |
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336 return Then( |
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337 that, |
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338 handler, |
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339 errorOrCancel, |
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340 errorOrCancel); |
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341 } |
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342 |
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343 public static IPromise Error(this IPromise that, Action<Exception> handler, bool handleCancellation) { |
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344 Action<Exception> errorOrCancel; |
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345 if (handler != null) |
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346 errorOrCancel = e => { |
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347 handler(e); |
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348 throw new PromiseTransientException(e); |
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349 }; |
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350 else |
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351 errorOrCancel = null; |
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352 |
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353 return Then(that, null, errorOrCancel, handleCancellation ? errorOrCancel : null); |
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354 } |
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355 |
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356 public static IPromise Error(this IPromise that, Action<Exception> handler) { |
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357 return Error(that, handler, false); |
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358 } |
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359 |
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360 public static IPromise<T> Error<T>(this IPromise<T> that, Action<Exception> handler, bool handleCancellation) { |
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361 Func<Exception, T> errorOrCancel; |
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362 if (handler != null) |
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363 errorOrCancel = e => { |
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364 handler(e); |
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365 throw new PromiseTransientException(e); |
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366 }; |
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367 else |
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368 errorOrCancel = null; |
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369 |
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370 return Then(that, null, errorOrCancel, handleCancellation ? errorOrCancel : null); |
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371 } |
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372 |
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373 public static IPromise<T> Error<T>(this IPromise<T> that, Action<Exception> handler) { |
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374 return Error(that, handler, false); |
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375 } |
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376 |
145 | 377 #region chain traits |
207
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378 public static IPromise Chain(this IPromise that, Func<IPromise> success, Func<Exception, IPromise> error, Func<Exception, IPromise> cancel) { |
145 | 379 Safe.ArgumentNotNull(that, "that"); |
380 | |
149 | 381 var d = new ActionChainTask(success, error, cancel, false); |
145 | 382 that.On(d.Resolve, d.Reject, d.CancelOperation); |
185 | 383 d.CancellationRequested(that.Cancel); |
145 | 384 return d; |
385 } | |
386 | |
207
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387 public static IPromise Chain(this IPromise that, Func<IPromise> success, Func<Exception, IPromise> error) { |
145 | 388 return Chain(that, success, error, null); |
389 } | |
390 | |
391 public static IPromise Chain(this IPromise that, Func<IPromise> success) { | |
392 return Chain(that, success, null, null); | |
393 } | |
394 | |
395 public static IPromise<T> Chain<T>(this IPromise that, Func<IPromise<T>> success, Func<Exception, IPromise<T>> error, Func<Exception, IPromise<T>> cancel) { | |
396 Safe.ArgumentNotNull(that, "that"); | |
397 | |
149 | 398 var d = new FuncChainTask<T>(success, error, cancel, false); |
145 | 399 that.On(d.Resolve, d.Reject, d.CancelOperation); |
400 if (success != null) | |
401 d.CancellationRequested(that.Cancel); | |
402 return d; | |
403 } | |
404 | |
405 public static IPromise<T> Chain<T>(this IPromise that, Func<IPromise<T>> success, Func<Exception, IPromise<T>> error) { | |
406 return Chain(that, success, error, null); | |
407 } | |
408 | |
409 public static IPromise<T> Chain<T>(this IPromise that, Func<IPromise<T>> success) { | |
410 return Chain(that, success, null, null); | |
411 } | |
412 | |
413 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) { | |
414 Safe.ArgumentNotNull(that, "that"); | |
207
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415 var d = new FuncChainTask<T, T2>(success, error, cancel, false); |
145 | 416 that.On(d.Resolve, d.Reject, d.CancelOperation); |
417 if (success != null) | |
418 d.CancellationRequested(that.Cancel); | |
419 return d; | |
420 } | |
421 | |
422 public static IPromise<T2> Chain<T, T2>(this IPromise<T> that, Func<T, IPromise<T2>> success, Func<Exception, IPromise<T2>> error) { | |
423 return Chain(that, success, error, null); | |
424 } | |
425 | |
426 public static IPromise<T2> Chain<T, T2>(this IPromise<T> that, Func<T, IPromise<T2>> success) { | |
427 return Chain(that, success, null, null); | |
207
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428 } |
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429 |
145 | 430 #endregion |
207
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431 |
209 | 432 public static IPromise<T2> Guard<T, T2>(this IPromise<T> that, Func<IPromise<T>, IPromise<T2>> continuation, Action<T> cleanup) { |
433 Safe.ArgumentNotNull(that, "that"); | |
434 Safe.ArgumentNotNull(continuation, "continuation"); | |
435 return continuation(that).Error((err) => { | |
436 that.On(cleanup); | |
437 }, true); | |
438 } | |
207
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439 |
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440 #if NET_4_5 |
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441 |
151 | 442 public static PromiseAwaiter<T> GetAwaiter<T>(this IPromise<T> that) { |
75 | 443 Safe.ArgumentNotNull(that, "that"); |
444 | |
151 | 445 return new PromiseAwaiter<T>(that); |
207
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446 } |
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447 |
208
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448 public static PromiseAwaiter GetAwaiter(this IPromise that) { |
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449 Safe.ArgumentNotNull(that, "that"); |
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450 |
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451 return new PromiseAwaiter(that); |
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452 } |
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453 |
209 | 454 public static IPromise BoundCancellationToken(this IPromise that, CancellationToken ct) { |
455 Safe.ArgumentNotNull(that, "that"); | |
456 ct.Register(that.Cancel); | |
457 return that.Then(null, null, (err) => { | |
458 ct.ThrowIfCancellationRequested(); | |
459 throw new PromiseTransientException(err); | |
460 }); | |
461 } | |
462 | |
463 public static IPromise<T> BoundCancellationToken<T>(this IPromise<T> that, CancellationToken ct) { | |
464 Safe.ArgumentNotNull(that, "that"); | |
465 ct.Register(that.Cancel); | |
466 return that.Then(null, null, (err) => { | |
467 ct.ThrowIfCancellationRequested(); | |
468 throw new PromiseTransientException(err); | |
469 }); | |
470 } | |
471 | |
207
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472 #endif |
72 | 473 } |
474 } | |
475 |