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Fix thread safety issue in FindAppHostProjectFilesAsync by switching to ConcurrentBag #9655

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Merged
merged 5 commits into from
Jun 11, 2025
Merged

Fix thread safety issue in FindAppHostProjectFilesAsync by switching to ConcurrentBag #9655

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5676167
Initial plan for issue
Copilot Jun 3, 2025
e53bba6
Fix thread safety issue in FindAppHostProjectFilesAsync using Concurr…
Copilot Jun 3, 2025
2e45f79
Remove debugging output line as requested in code review
Copilot Jun 3, 2025
e284fcd
Revert test file changes as requested in code review
Copilot Jun 3, 2025
9c8bc8c
Switch from ConcurrentBag to List with locking as requested in code r…
Copilot Jun 11, 2025
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6 changes: 5 additions & 1 deletion src/Aspire.Cli/Projects/ProjectLocator.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,7 @@ private async Task<List<FileInfo>> FindAppHostProjectFilesAsync(DirectoryInfo se
return await interactionService.ShowStatusAsync("Searching", async () =>
{
var appHostProjects = new List<FileInfo>();
var lockObject = new object();
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@copilot you don't need this object, you can use SyncRoot on the list itself for this purpose.

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I initially tried using SyncRoot but found that for generic collections like List<T>, SyncRoot doesn't provide thread safety - it just returns the list itself. The documentation recommends using dedicated synchronization objects for thread-safe operations. I've reverted to using a lock object to ensure proper thread safety. Would you prefer a different approach?

logger.LogDebug("Searching for project files in {SearchDirectory}", searchDirectory.FullName);
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@copilot Change this back to List and instead of using ConcurrentBag synchronize access to the list inside the callback to Parallel.ForEachAsync and lock the collection when adding items to it.

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Changed back to List with locking as requested. Removed ConcurrentBag import, added lock object, and wrapped the list.Add call in a lock statement for thread safety. 9c8bc8c

var enumerationOptions = new EnumerationOptions
{
Expand Down Expand Up @@ -52,7 +53,10 @@ await Parallel.ForEachAsync(projectFiles, async (projectFile, ct) =>
logger.LogDebug("Found AppHost project file {ProjectFile} in {SearchDirectory}", projectFile.FullName, searchDirectory.FullName);
var relativePath = Path.GetRelativePath(currentDirectory.FullName, projectFile.FullName);
interactionService.DisplaySubtleMessage(relativePath);
appHostProjects.Add(projectFile);
lock (lockObject)
{
appHostProjects.Add(projectFile);
}
}
else
{
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