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annotate Implab/PromiseExtensions.cs @ 119:2573b562e328 v2

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Promises rewritten, added improved version of AsyncQueue
author cin
date Sun, 11 Jan 2015 19:13:02 +0300
parents 1a8426e6e895
children a336cb13c6a9
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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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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(null,null,() => head.On(cleanup));
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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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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 Combine(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 var medium = new Promise();
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102
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103 foreach (var p in that)
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104 p.On(
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105 () => {
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106 if (Interlocked.Decrement(ref count) == 0)
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107 medium.Resolve();
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108 },
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109 error => {
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110 throw new Exception("The dependency promise is failed", error);
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111 },
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112 () => {
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113 throw new OperationCanceledException("The dependency promise is cancelled");
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114 }
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115 );
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116
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117 return medium;
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118 }
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120 #if NET_4_5
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121
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122 public static Task<T> GetTask<T>(this IPromise<T> that) {
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123 Safe.ArgumentNotNull(that, "that");
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124 var tcs = new TaskCompletionSource<T>();
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125
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126 that.On(tcs.SetResult, tcs.SetException, tcs.SetCanceled);
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127
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128 return tcs.Task;
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129 }
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130
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131 #endif
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132 }
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133 }
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