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
@@ -0,0 +1,9 @@
+Pointer writes per HashMapLruCache operation, by cache size
+===========================================================
+
+capacity   get(hit)     get(miss)    put(new)       put(new, evicts LRU)  
+10         6            0            4              6                     
+1000       6            0            4              6                     
+100000     6            0            4              6                     
+
+get(hit) is measured on the OLDEST key (position n from the front). Cost is 6 writes anyway: the node is reached through the hash index, not by walking the list.