test

My project/Library/PackageCache/com.unity.ide.visualstudio/Editor/AsyncOperation.cs

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+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Unity Technologies.
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+using System;
+using System.Threading;
+
+namespace Microsoft.Unity.VisualStudio.Editor
+{
+	internal class AsyncOperation<T>
+	{
+		private readonly Func<T> _producer;
+		private readonly Func<Exception, T> _exceptionHandler;
+		private readonly Action _finalHandler;
+		private readonly ManualResetEventSlim _resetEvent;
+
+		private T _result;
+		private Exception _exception;
+
+		private AsyncOperation(Func<T> producer, Func<Exception, T> exceptionHandler, Action finalHandler)
+		{
+			_producer = producer;
+			_exceptionHandler = exceptionHandler;
+			_finalHandler = finalHandler;
+			_resetEvent = new ManualResetEventSlim(initialState: false);
+		}
+
+		public static AsyncOperation<T> Run(Func<T> producer, Func<Exception, T> exceptionHandler = null, Action finalHandler = null)
+		{
+			var task = new AsyncOperation<T>(producer, exceptionHandler, finalHandler);
+			task.Run();
+			return task;
+		}
+
+		private void Run()
+		{
+			ThreadPool.QueueUserWorkItem(_ =>
+			{
+				try
+				{
+					_result = _producer();
+				}
+				catch (Exception e)
+				{
+					_exception = e;
+
+					if (_exceptionHandler != null)
+					{
+						_result = _exceptionHandler(e);
+					}
+				}
+				finally
+				{
+					_finalHandler?.Invoke();
+					_resetEvent.Set();
+				}
+			});
+		}
+
+		private void CheckCompletion()
+		{
+			if (!_resetEvent.IsSet)
+				_resetEvent.Wait();
+		}
+
+
+		public T Result
+		{
+			get
+			{
+				CheckCompletion();
+				return _result;
+			}
+		}
+
+		public Exception Exception
+		{
+			get
+			{
+				CheckCompletion();
+				return _exception;
+			}
+		}
+	}
+}