LruCache optimization to reduce lock contention#5780
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Signed-off-by: pizzi80 <paolo@given2.com>
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I've refactored LRUCache to switch back to a native
synchronized block and move the factory execution outside of it.
With JEP 491, synchronized is now 100% friendly with Virtual Threads (no pinning),
and the previous ReentrantLock approach with computeIfAbsent
created a sequential bottleneck inside the lock that heavily penalized performance under high concurrency.