Claude
6b5a918278
gatherers/: windowFixed, windowSliding, fold, scan, mapConcurrent, a custom Gatherer (dedupeConsecutive, takeUntil), and a Collector-vs-Gatherer comparison. Verified: windowSliding emits one short window on a too-short stream rather than shrinking to empty like windowFixed; mapConcurrent waits for in-flight siblings to finish (~901ms) rather than cancelling them when one mapper throws. scoped-values/: ScopedValue API and rebinding, why plain threads (virtual or platform) do not inherit a binding while a StructuredTaskScope subtask does, and the memory cost vs InheritableThreadLocal measured two ways -- a noisy heap-delta first pass, then a precise jcmd GC.class_histogram object census (5 shared Carrier objects vs ~700,000 copied ThreadLocalMap/Entry objects for 100,000 threads). Companion code for the ankurm.com posts "Java Stream Gatherers (JEP 485)" and "Scoped Values vs ThreadLocal in Java 25: Migration Guide with Virtual Threads". Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01FtpJvZfg4nvLvtzgJTDWpB
16 lines
1.0 KiB
Plaintext
16 lines
1.0 KiB
Plaintext
$ java ScopedValuesBasics (JDK 25, no preview flag -- JEP 506 is final)
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CHECK ok : isBound() is true inside where().run()
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CHECK ok : get() returns "ankur" inside the binding
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CHECK ok : a method several frames deep, given no parameter, still sees the binding
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CHECK ok : isBound() is false again once run() has returned
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CHECK ok : get() outside a binding throws NoSuchElementException, not null or a default value
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CHECK ok : orElse(fallback) returns the fallback when unbound, no exception
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CHECK ok : orElse(fallback) returns the real value when bound
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CHECK ok : orElseThrow(supplier) throws exactly the supplied exception when unbound
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CHECK ok : outer binding: ankur
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CHECK ok : inner binding shadows the outer one: support-bot
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CHECK ok : a method called from inside the inner scope sees the REBOUND value, not the original
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CHECK ok : outer binding is restored, unchanged, once the inner where() block exits: ankur
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CHECK ok : call(...) returns whatever the lambda returns -- USER.get().length() == 5
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exit=0
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