Asynchronous user request processing and caching

[katrienkraska]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Great work on this task! I'm approving your solution as it correctly implements all the core requirements for asynchronous processing and caching using CompletableFuture.

For future improvement, consider a subtle race condition: if multiple threads request the same new userId at once, they might all find the cache empty and perform the expensive operation redundantly. A more robust solution would use an atomic map operation like cache.computeIfAbsent() to ensure the task is only initiated once per user.

This is a refinement rather than a blocker, and your current implementation meets all requirements. Well done!

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