asmhatre
a9867c0423
A Spring Boot 4.1.1 module whose test suite is the evidence for the article: 20 tests producing 22 transcripts under docs/output/, plus 12 documentation chapters. Findings the build pins: - @EnableCaching has no exposeProxy attribute; the widely-copied @EnableCaching(exposeProxy = true) does not compile. - Two methods sharing a cache name and an argument type share a key space, and one silently serves the other's answers. - The documented cache-provider detection order does not match CacheType's enum order in 4.1.1: COUCHBASE before INFINISPAN, and CACHE2K before CAFFEINE. - beforeInvocation = true is NOT deferred by TransactionAwareCacheManagerProxy on 7.0.9 - doEvict picks evictIfPresent, which the decorator does not intercept. - Four of five invalid declarations start a clean context and throw at the first call. - Caffeine on the classpath silently displaces the simple provider.
23 lines
804 B
Plaintext
23 lines
804 B
Plaintext
# A rollback does not roll the cache back
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cacheManager : org.springframework.cache.concurrent.ConcurrentMapCacheManager
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nameOf(1) -> Alice
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An outer @Transactional method calls the @CachePut update, which succeeds,
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and then fails on the next step. The transaction rolls back.
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what the cache serves : Alice Cooper
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what the database has : Alice
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The cache is now holding a name that no transaction ever committed. Nothing
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will correct it until the entry expires or something evicts it.
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--- the same shape with @CacheEvict ---
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nameOf(2) -> Bob
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after the rollback, nameOf(2) -> Bob
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database loads: 2 <- the entry was evicted, so this one reloaded
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An eviction that fires too early is self-healing: the next read goes to the
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database and re-populates correctly. A @CachePut that fires too early is not.
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