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.
17 lines
635 B
Plaintext
17 lines
635 B
Plaintext
# A cached null is a real entry called NullValue
|
|
|
|
searchCachingNulls("xyz") returns null, called twice -> 1 invocations
|
|
|
|
cache "nulls":
|
|
key xyz -> null [org.springframework.cache.support.NullValue]
|
|
|
|
The abstraction stores org.springframework.cache.support.NullValue.INSTANCE
|
|
so a hit on null is distinguishable from a miss. This is usually what you
|
|
want - it is the cheap defence against a hot lookup for a row that is not
|
|
there - and occasionally exactly what you do not want.
|
|
|
|
--- unless = "#result == null" ---
|
|
searchNullable("xyz") twice -> 2 invocations <- the null was never stored
|
|
cache "terms":
|
|
(empty)
|