fix: thread memory leak in InProcessResolver

[paul-kraftlauget]

This PR

• fixes a memory leak in InProcessResolver

Related Issues

Fixes #1677

How to test

Please see the unit test in this PR

[gemini-code-assist]

Summary of Changes

Hello @paul-kraftlauget, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical memory leak in the InProcessResolver by implementing a robust thread shutdown mechanism. The changes ensure that a background thread responsible for watching state changes is properly terminated when the resolver is no longer needed, preventing it from consuming resources indefinitely. This improves the overall stability and resource management of the application.

Highlights

• Thread Shutdown Mechanism: Introduced an AtomicBoolean named shutdown in InProcessResolver to manage the termination state of the stateWatcher thread.
• Memory Leak Fix: Modified the stateWatcher thread's main loop condition from while (true) to while (!shutdown.get()), ensuring the thread gracefully exits when the resolver is shut down.
• Shutdown Method Enhancement: Implemented shutdown.set(true) within the shutdown() method of InProcessResolver to signal the stateWatcher thread to terminate, preventing resource leaks.
• Unit Test for Thread Cleanup: Added a new unit test, testStateWatcherThreadIsCleanedUpDuringShutdown, to InProcessResolverTest to verify that the stateWatcher thread is properly terminated and cleaned up upon calling shutdown().

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[gemini-code-assist]

Code Review

This pull request fixes a thread leak in InProcessResolver by introducing a shutdown flag to allow the stateWatcher thread to terminate gracefully. The change is correct and addresses the issue.

My review includes two main points for improvement:

1. In InProcessResolver.java, I've suggested a more robust shutdown pattern using thread interruption. This would make the component's shutdown logic more self-contained and less reliant on the behavior of downstream components.
2. In InProcessResolverTest.java, I've pointed out that the new test for the shutdown logic isn't fully representative of the production scenario, as it manually unblocks the thread instead of verifying that the shutdown process does so.

These suggestions aim to improve the robustness and test quality of the solution.

[toddbaert]

@paul-kraftlauget Thanks a lot! can you fix the DCO failure? You can do a git commit --amend --signoff which just gives a legal signoff to the commit.