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Add lazy-constants module: LazyConstant (JEP 531) against the holder idiom and double-checked locking

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Basics, failure semantics on 26 vs 27, lazy collections, API across 25/26/27, preview-flag traps and a JMH read-path benchmark (jars fetched and sha1-checked, not committed).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 12:27:27 +00:00
parent af44e59e7f
commit 814c32b5ce
25 changed files with 606 additions and 0 deletions
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lazy-constants/output/02-basics.txt
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$ javac --enable-preview --release 27 src/Basics.java && java --enable-preview Basics (27+35)
supplier calls before get: 0
get() returns: loaded
get() again: loaded
supplier calls after two gets: 1
16 threads asked at once, supplier calls: 1
$ javac --enable-preview --release 27 src/ToStringStates.java && java --enable-preview ToStringStates (27+35)
before get: [computing function=ToStringStates$$Lambda]
after get: [loaded]
after failed get: [failed with=java.lang.IllegalStateException]
$ javac --enable-preview --release 27 src/Service.java && java --enable-preview Service (27+35)
service created
[load] reading configuration
url: https://example.test
url again: https://example.test
[compile] building the e-mail pattern
isEmail([email protected]): true
isEmail(nope): false