annotate Implab.Fx/PromiseHelpers.cs @ 42:3ba6778ed336

fixed ArgumentNullException in StartLogicalOperation
author cin
date Wed, 16 Apr 2014 00:33:09 +0400
parents 381095ad0a69
children d67b95eddaf4 0fdaf280c797
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Linq;
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4 using System.Text;
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5 using System.Windows.Forms;
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6 using System.Threading;
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7
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8 namespace Implab.Fx
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9 {
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10 public static class PromiseHelpers
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11 {
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12 /// <summary>
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13 /// Перенаправляет обработку обещания в поток указанного элемента управления.
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14 /// </summary>
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15 /// <typeparam name="T">Тип результата обещания</typeparam>
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16 /// <param name="that">Исходное обещание</param>
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17 /// <param name="ctl">Элемент управления</param>
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18 /// <returns>Новое обещание, обработчики которого будут выполнены в потоке элемента управления.</returns>
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19 /// <exception cref="ArgumentNullException">Параметр не может быть <c>null</c>.</exception>
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20 /// <example>
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21 /// client
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22 /// .Get("description.txt") // returns a promise
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23 /// .DirectToControl(m_ctl) // handle the promise in the thread of the control
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24 /// .Then(
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25 /// description => m_ctl.Text = description // now it's safe
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26 /// )
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27 /// </example>
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28 public static Promise<T> DispatchToControl<T>(this Promise<T> that, Control ctl)
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29 {
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30 if (that == null)
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31 throw new ArgumentNullException("that");
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32 if (ctl == null)
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33 throw new ArgumentNullException("ctl");
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34
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35 var directed = new Promise<T>();
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36
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37 that.Then(
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38 res =>
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39 {
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40 if (ctl.InvokeRequired)
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41 ctl.Invoke(new Action<T>(directed.Resolve), res);
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42 else
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43 directed.Resolve(res);
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44 },
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45 err =>
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46 {
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47 if (ctl.InvokeRequired)
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48 ctl.Invoke(new Action<Exception>(directed.Reject), err);
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49 else
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50 directed.Reject(err);
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51 }
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52 );
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53
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54 return directed;
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55 }
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56
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57 /// <summary>
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58 /// Направляет обработку обещания в текущий поток, если у него существует контекст синхронизации.
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59 /// </summary>
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60 /// <typeparam name="T">Тип результата обещания.</typeparam>
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61 /// <param name="that">Обещание которое нужно обработать в текущем потоке.</param>
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62 /// <returns>Перенаправленное обещание.</returns>
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63 public static Promise<T> DispatchToCurrentThread<T>(this Promise<T> that)
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64 {
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65 var sync = SynchronizationContext.Current;
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66 if (sync == null)
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67 throw new InvalidOperationException("The current thread doesn't have a syncronization context");
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68 return DispatchToSyncContext(that, sync);
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69 }
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70
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71 /// <summary>
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72 /// Направляет обработку обещания в указанный контекст синхронизации.
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73 /// </summary>
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74 /// <typeparam name="T">Тип результата обещания.</typeparam>
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75 /// <param name="that">Обещание, которое требуется обработать в указанном контексте синхронизации.</param>
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76 /// <param name="sync">Контекст синхронизации в который будет направлено обещание.</param>
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77 /// <returns>Новое обещание, которое будет обрабатываться в указанном контексте.</returns>
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78 public static Promise<T> DispatchToSyncContext<T>(this Promise<T> that, SynchronizationContext sync)
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79 {
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80 if (that == null)
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81 throw new ArgumentNullException("that");
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82 if (sync == null)
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83 throw new ArgumentNullException("sync");
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84
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85 var d = new Promise<T>();
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86
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87 that.Then(
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88 res => sync.Post(state => d.Resolve(res), null),
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89 err => sync.Post(state => d.Reject(err), null)
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90 );
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91
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92 return d;
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93 }
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94 }
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95 }