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| 1 | +using System.Threading.Tasks; |
| 2 | +using ThreadHelper = Microsoft.VisualStudio.Shell.ThreadHelper; |
| 3 | +using GitHub.Extensions; |
| 4 | +using System.Runtime.CompilerServices; |
| 5 | +using System; |
| 6 | +using static Microsoft.VisualStudio.Threading.JoinableTaskFactory; |
| 7 | +using static Microsoft.VisualStudio.Threading.AwaitExtensions; |
| 8 | + |
| 9 | +namespace GitHub.Helpers |
| 10 | +{ |
| 11 | + public interface IAwaitable |
| 12 | + { |
| 13 | + IAwaiter GetAwaiter(); |
| 14 | + } |
| 15 | + |
| 16 | + public interface IAwaiter : INotifyCompletion |
| 17 | + { |
| 18 | + bool IsCompleted { get; } |
| 19 | + void GetResult(); |
| 20 | + } |
| 21 | + |
| 22 | + public static class ThreadingHelper |
| 23 | + { |
| 24 | + /// <summary> |
| 25 | + /// Switch to the UI thread using ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync |
| 26 | + /// Auto-disables switching when running in unit test mode |
| 27 | + /// </summary> |
| 28 | + /// <returns></returns> |
| 29 | + public static IAwaitable SwitchToMainThreadAsync() |
| 30 | + { |
| 31 | + return Guard.InUnitTestRunner() ? |
| 32 | + new AwaitableWrapper() : |
| 33 | + new AwaitableWrapper(ThreadHelper.JoinableTaskFactory.SwitchToMainThreadAsync()); |
| 34 | + } |
| 35 | + |
| 36 | + /// <summary> |
| 37 | + /// Switch to a thread pool background thread if the current thread isn't one, otherwise does nothing |
| 38 | + /// Auto-disables switching when running in unit test mode |
| 39 | + /// </summary> |
| 40 | + /// <param name="scheduler"></param> |
| 41 | + /// <returns></returns> |
| 42 | + public static IAwaitable SwitchToPoolThreadAsync(TaskScheduler scheduler) |
| 43 | + { |
| 44 | + return Guard.InUnitTestRunner() ? |
| 45 | + new AwaitableWrapper() : |
| 46 | + new AwaitableWrapper(scheduler); |
| 47 | + } |
| 48 | + |
| 49 | + class AwaitableWrapper : IAwaitable |
| 50 | + { |
| 51 | + Func<IAwaiter> getAwaiter; |
| 52 | + |
| 53 | + public AwaitableWrapper() |
| 54 | + { |
| 55 | + getAwaiter = () => new AwaiterWrapper(); |
| 56 | + } |
| 57 | + |
| 58 | + public AwaitableWrapper(MainThreadAwaitable awaitable) |
| 59 | + { |
| 60 | + getAwaiter = () => new AwaiterWrapper(awaitable.GetAwaiter()); |
| 61 | + } |
| 62 | + |
| 63 | + public AwaitableWrapper(TaskScheduler scheduler) |
| 64 | + { |
| 65 | + getAwaiter = () => new AwaiterWrapper(new TaskSchedulerAwaiter(scheduler)); |
| 66 | + } |
| 67 | + |
| 68 | + public IAwaiter GetAwaiter() => getAwaiter(); |
| 69 | + } |
| 70 | + |
| 71 | + class AwaiterWrapper : IAwaiter |
| 72 | + { |
| 73 | + Func<bool> isCompleted; |
| 74 | + Action<Action> onCompleted; |
| 75 | + Action getResult; |
| 76 | + |
| 77 | + public AwaiterWrapper() |
| 78 | + { |
| 79 | + isCompleted = () => true; |
| 80 | + onCompleted = c => c(); |
| 81 | + getResult = () => {}; |
| 82 | + } |
| 83 | + |
| 84 | + public AwaiterWrapper(MainThreadAwaiter awaiter) |
| 85 | + { |
| 86 | + isCompleted = () => awaiter.IsCompleted; |
| 87 | + onCompleted = c => awaiter.OnCompleted(c); |
| 88 | + getResult = () => awaiter.GetResult(); |
| 89 | + } |
| 90 | + |
| 91 | + public AwaiterWrapper(TaskSchedulerAwaiter awaiter) |
| 92 | + { |
| 93 | + isCompleted = () => awaiter.IsCompleted; |
| 94 | + onCompleted = c => awaiter.OnCompleted(c); |
| 95 | + getResult = () => awaiter.GetResult(); |
| 96 | + } |
| 97 | + |
| 98 | + public bool IsCompleted => isCompleted(); |
| 99 | + |
| 100 | + public void OnCompleted(Action continuation) => onCompleted(continuation); |
| 101 | + |
| 102 | + public void GetResult() => getResult(); |
| 103 | + } |
| 104 | + } |
| 105 | +} |
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