Using Java 8 Lambdas and Stampedlock to manage thread safety
summary
Explains using Java 8 StampedLock for optimistic reads ~90% success and when to fall back to a pessimistic read or exclusive write; shows a Position example that moves x and y together and warns StampedLock is non-reentrant so upgrades can fail and are tricky. Compares implementations: AtomicReference CAS and Unsafe/VarHandle approaches (notes VarHandle parity with Unsafe and often similar speed). Presents lambdas to encapsulate lock idioms, notes checked-exception friction and that real benchmarking depends heavily on contention.
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