fix(multiprovider): Properly shutdown multiprovider initialization thread pool

[alxckn]

This PR

This pull request refactors the initialization logic in the MultiProvider class to ensure proper resource management for the thread pool used during provider initialization. The main change is moving the creation and shutdown of the ExecutorService into a try-finally block, which guarantees that the thread pool is always shut down, even if an exception occurs.

We observed issues with some of our apps that fail to shutdown properly because of a hanging non-daemon thread, the changes proposed in this PR fix the issue (tested on our previously failing app).

[gemini-code-assist]

Summary of Changes

Hello @alxckn, 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 enhances the robustness of the MultiProvider's initialization process by implementing a guaranteed shutdown mechanism for its internal thread pool. By enclosing the thread pool's lifecycle within a try-finally block, it prevents resource leaks and addresses a critical issue where applications would fail to terminate cleanly due to persistent non-daemon threads.

Highlights

• Resource Management: The initialization logic within the MultiProvider class has been refactored to ensure proper resource management for the thread pool used during provider initialization.
• Thread Pool Shutdown: The ExecutorService is now created and shut down within a try-finally block, guaranteeing its termination even if exceptions occur during the initialization process.
• Application Stability: This change addresses issues where applications failed to shut down correctly due to hanging non-daemon threads, thereby improving overall application stability and shutdown behavior.

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[gemini-code-assist]

Code Review

This pull request correctly refactors the provider initialization logic to prevent resource leaks from the thread pool by using a try-finally block. This ensures the ExecutorService is always shut down, even in the case of an exception. The change is a solid improvement for application stability. I have one suggestion to improve the error handling logic within the new try block.

[chrfwow]

Since we always return true and never use this value, could we get rid of this value entirely? Maybe with a Future<Void>?

[chrfwow]

Maybe we should check for result.isCancelled(), and also add a sensible timeout result.get(timeout, TimeUnit.MILLISECONDS);.

[liran2000]

This was moved, treated and depecated, so can be closed?

handled

[chrfwow]

@alxckn The multi provider was moved to the java-sdk repository: https://github.com/open-feature/java-sdk/tree/main/src/main/java/dev/openfeature/sdk/multiprovider
Please migrate to this version. As pointed out by @liran2000, the issues you worked on were fixed there

[alxckn]

@chrfwow @liran2000 thanks for reviewing sorry I hadn't noticed the migration, and happy to see it's been internalized and already fixed :) We'll migrate to fix our issue

[toddbaert]

@alxckn it's migrated but not released! We have a few new things / fixes in Java though, so I'll try to get a release out soon (if not today): open-feature/java-sdk#1770