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Add locking module: optimistic vs pessimistic locking on Hibernate 7.4.14.Final

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Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01YPgGH6aMbSLANL3E2HHmS6
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asmhatre
2026-10-25 17:01:49 +00:00
co-authored by Claude Sonnet 5.5
parent 807f681ed1
commit 357ba84e5c
18 changed files with 758 additions and 0 deletions
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locking/output/04-pessimistic-write.txt
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A locks row 1 with PESSIMISTIC_WRITE, holds it 600 ms, deposits 10
B asks for the same lock, then deposits 20
B waited at least 400 ms for the lock: true
final balance: 130 (correct: 130)
select statements Hibernate sent (one per transaction):
select a1_0.id,a1_0.balance,a1_0.owner from Account a1_0 where a1_0.id=? for update
select a1_0.id,a1_0.balance,a1_0.owner from Account a1_0 where a1_0.id=? for update