Add IAsyncLock implementation

src/Infrastructure.VS.UnitTests/AsyncLockFactoryTests.cs

@@ -0,0 +1,48 @@
+/*
+ * SonarLint for Visual Studio
+ * Copyright (C) 2016-2024 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using SonarLint.VisualStudio.Core.Synchronization;
+using SonarLint.VisualStudio.TestInfrastructure;
+
+namespace SonarLint.VisualStudio.Infrastructure.VS.UnitTests;
+
+[TestClass]
+public class AsyncLockFactoryTests
+{
+    [TestMethod]
+    public void MefCtor_CheckIsExported()
+    {
+        MefTestHelpers.CheckTypeCanBeImported<AsyncLockFactory, IAsyncLockFactory>();
+    }
+
+    [TestMethod]
+    public void MefCtor_CheckIsSingleton()
+    {
+        MefTestHelpers.CheckIsSingletonMefComponent<AsyncLockFactory>();
+    }
+
+    [TestMethod]
+    public void Create_ReturnsValue()
+    {
+        new AsyncLockFactory().Create().Should().NotBeNull();
+    }
+}

src/Infrastructure.VS.UnitTests/AsyncLockTests.cs

@@ -0,0 +1,58 @@
+/*
+ * SonarLint for Visual Studio
+ * Copyright (C) 2016-2024 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using SonarLint.VisualStudio.Core.Synchronization;
+
+namespace SonarLint.VisualStudio.Infrastructure.VS.UnitTests;
+
+[TestClass]
+public class AsyncLockTests
+{
+    [TestMethod]
+    public async Task SmokeTest()
+    {
+        var testSubject = new AsyncLock();
+
+        var numbers = new List<int> { 0 };
+        var threadNumbers = new List<int>();
+
+        await Task.WhenAll(Enumerable.Range(0, 10).Select(number => Task.Run(() => AddIncrement(numbers, threadNumbers, number, testSubject))));
+
+        threadNumbers.Should().NotBeAscendingInOrder(); // checks multiple threads actually ran in parallel and not in sequence
+        numbers.Should().BeInAscendingOrder(); // checks threads were correctly synchronized
+    }
+
+    private static async Task AddIncrement(List<int> numbers, List<int> threadNumbers, int assignedThreadNumber, IAsyncLock asyncLock)
+    {
+        for (var i = 0; i < 10000; i++)
+        {
+            using (await asyncLock.AcquireAsync())
+            {
+                threadNumbers.Add(assignedThreadNumber);
+                numbers.Add(numbers[numbers.Count - 1] + 1);
+            }
+        }
+    }
+}

src/Infrastructure.VS/AsyncLock.cs

@@ -0,0 +1,77 @@
+/*
+ * SonarLint for Visual Studio
+ * Copyright (C) 2016-2024 SonarSource SA
+ * mailto:info AT sonarsource DOT com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+using System.ComponentModel.Composition;
+using System.Diagnostics.CodeAnalysis;
+using System.Threading;
+using System.Threading.Tasks;
+using SonarLint.VisualStudio.Core.Synchronization;
+
+namespace SonarLint.VisualStudio.Infrastructure.VS;
+
+
+[Export(typeof(IAsyncLockFactory))]
+[PartCreationPolicy(CreationPolicy.Shared)]
+internal class AsyncLockFactory : IAsyncLockFactory
+{
+    public IAsyncLock Create()
+    {
+        return new AsyncLock();
+    }
+}
+
+[ExcludeFromCodeCoverage]
+internal sealed class AsyncLock : IAsyncLock
+{
+    private readonly SemaphoreSlim semaphoreSlim = new (1, 1);
+
+    public IReleaseAsyncLock Acquire()
+    {
+        semaphoreSlim.Wait();
+
+        return new AsyncLockToken(this);
+    }
+
+    public async Task<IReleaseAsyncLock> AcquireAsync()
+    {
+        await semaphoreSlim.WaitAsync();
+
+        return new AsyncLockToken(this);
+    }
+
+    private void Release() => semaphoreSlim.Release();
+
+    public void Dispose() => semaphoreSlim.Dispose();
+
+    private sealed class AsyncLockToken : IReleaseAsyncLock
+    {
+        private readonly AsyncLock asyncLock;
+
+        public AsyncLockToken(AsyncLock asyncLock)
+        {
+            this.asyncLock = asyncLock;
+        }
+
+        public void Dispose()
+        {
+            asyncLock.Release();
+        }
+    }
+}