asmhatre
66208bcd97
A Spring Boot 4.1.1 module whose test suite is the evidence for the article: 19 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. - 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.
26 lines
991 B
Plaintext
26 lines
991 B
Plaintext
# The collision the default key generator makes easy
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countLetters(String) and countDigits(String) both write into cache "shared".
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countLetters("a1b2") -> letters=2 (repository calls: letters=1 digits=0)
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countDigits("a1b2") -> letters=2 (repository calls: letters=1 digits=0)
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countDigits never ran. It found the key "a1b2" already populated and
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returned the answer to a different question.
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cache "shared":
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key a1b2 [String] -> letters=2
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--- no-argument methods collide even harder ---
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currentBanner() -> banner-from-currentBanner
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currentFooter() -> banner-from-currentBanner <- both key on SimpleKey.EMPTY
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cache "noargs":
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key SimpleKey [] [SimpleKey] -> banner-from-currentBanner
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--- the fix: put the method into the key ---
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countLettersScoped("a1b2") -> letters=2
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countDigitsScoped("a1b2") -> digits=2
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cache "scoped":
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key digits:a1b2 [String] -> digits=2
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key letters:a1b2 [String] -> letters=2
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