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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
using System.Collections.Concurrent;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.VisualStudio.TestTools.UnitTesting;
namespace QtVsTools.Test.Core
{
using Common;
[TestClass]
public class Test_LazyFactory
{
class LazyClass
{
LazyFactory Lazy { get; } = new();
public ConcurrentBag<int> InitThread { get; } = new();
public string LazyProperty => Lazy.Get(() =>
LazyProperty, () =>
{
InitThread.Add(Thread.CurrentThread.ManagedThreadId);
return "LAZYVALUE";
});
}
[TestMethod]
public void Test_ThreadSafety()
{
var lazyObject = new LazyClass();
var task = Task.Run(async () =>
{
var tasks = new Task[3000];
for (int i = 0; i < tasks.Length; i++) {
var n = i;
tasks[i] = Task.Run(() =>
{
var lazyValue = lazyObject.LazyProperty;
Debug.WriteLine($"Lazy value #{n} is {lazyValue}");
});
}
await Task.WhenAll(tasks);
});
while (!task.IsCompleted)
Thread.Sleep(100);
Assert.IsTrue(lazyObject.InitThread.Count == 1);
}
}
}
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