juicewcode opened a new pull request, #7197:
URL: https://github.com/apache/shenyu/pull/7197
Fixes #6686
## Summary
- Replace `ArrayList` with `CopyOnWriteArrayList` in
`DiscoveryDataChangedEventSyncListener`.
- Add a deterministic concurrency test reproducing the issue scenario.
## Test
- Added `testOnChangeIsSafeWhenListenerIsAddedConcurrently`.
- The test pauses `onChange` while processing a listener, adds another
listener concurrently, then verifies that
`onChange` completes without throwing an exception.
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