GH-158 Refactor PlayTimeApiProvider to use AtomicReference for thread-safe registration

[imDMK]

Removes explicit synchronization and introduces lock-free thread-safe registration using AtomicReference#compareAndSet.

[gemini-code-assist]

Summary of Changes

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This pull request refactors the PlayTimeApiProvider class to enhance its thread safety and concurrency model. By transitioning from traditional volatile fields and synchronized methods to AtomicReference, the changes ensure that the registration and unregistration of the PlayTimeApi are performed in a non-blocking, atomic manner, leading to a more robust and efficient design for managing a singleton-like API instance.

Highlights

• Thread-Safe Registration: Replaced the volatile field and synchronized methods in PlayTimeApiProvider with AtomicReference to achieve lock-free, thread-safe registration and unregistration of the PlayTimeApi instance.
• Concurrency Improvement: Eliminated explicit synchronization, which can improve performance and reduce contention in highly concurrent environments where the API is registered or unregistered.

Changelog

• playtime-api/src/main/java/com/github/imdmk/playtime/PlayTimeApiProvider.java
  • Replaced the volatile PlayTimeApi API field with an AtomicReference<PlayTimeApi> API.
  • Removed the synchronized keyword from the register and unregister static methods.
  • Updated the get() and isRegistered() methods to interact with the AtomicReference via API.get().
  • Implemented the register and unregister logic using API.compareAndSet() for atomic updates.

Activity

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[gemini-code-assist]

Code Review

This pull request correctly refactors the PlayTimeApiProvider to use AtomicReference for lock-free thread-safe registration, which is a good performance and design improvement. However, I've identified a bug in the unregister method's new implementation that causes it to behave incorrectly when the API is not registered. I've provided a specific suggestion to fix this issue while maintaining the lock-free approach.