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.
25 lines
1.1 KiB
Plaintext
25 lines
1.1 KiB
Plaintext
# TTL and size bounds are the provider's job, not the abstraction's
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cacheManager : org.springframework.cache.caffeine.CaffeineCacheManager
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configured : expireAfterWrite=400ms, maximumSize=3, recordStats
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two calls, same key, immediately -> 1 repository calls
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one more call 600 ms later -> 2 repository calls <- the entry expired
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--- size bound ---
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five distinct keys written, maximumSize = 3
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estimated size after eviction settles : 3
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stats : hits=1 misses=5 evictions=3
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--- recordStats is not on by default ---
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a Caffeine cache built without recordStats(), after 1 hit and 1 miss:
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CacheStats{hitCount=0, missCount=0, loadSuccessCount=0, loadFailureCount=0, totalLoadTime=0, evictionCount=0, evictionWeight=0}
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Every counter is zero. Micrometer's cache.gets and cache.evictions will
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exist and report zero too, which looks exactly like a cache nobody uses.
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The Spring cache abstraction has no TTL, no size limit and no eviction
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policy of its own - it is an interface over whatever you plug in. On the
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default simple provider, a ConcurrentHashMap, an entry stays until something
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evicts it by hand or the process ends.
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