Add lru-cache module: LinkedHashMap and hand-rolled DLL LRU, coarse-lock/striped thread-safe variants, broken ReadWriteLock demo, Caffeine reference, 43 tests, JMH harness

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ
2026-10-29 05:52:27 +00:00
parent 4a376b94e9
commit 0457cf4bfb
31 changed files with 1425 additions and 0 deletions
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+8 threads x 60000 ops (80% get / 20% put), capacity 64, 256 keys
+================================================================
+
+implementation           exceptions   wrong values   size>capacity seen?    invariants       post-stress LRU check
+SynchronizedLruCache     0            0              no                     ok               ok
+ReentrantLockLruCache    0            0              no                     ok               ok
+StripedLruCache(8)       0            0              no                     ok               n/a (per-segment LRU)
+
+Hit/miss counts are deliberately not printed: they differ on every run and nothing asserts them.