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
9 lines
635 B
Plaintext
9 lines
635 B
Plaintext
$ java --enable-preview InheritanceRequiresStructuredTaskScope (JDK 25)
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Thread.ofVirtual().start(...) from inside the bound block: UNBOUND
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CHECK ok : a plain virtual thread started from inside where().run() does NOT see the binding -- REQUEST_ID.get() threw NoSuchElementException
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new Thread(...) from inside the bound block: UNBOUND
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CHECK ok : a plain platform Thread doesn't see the binding either -- this isn't a virtual-thread-specific rule
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StructuredTaskScope.fork(...) from inside the bound block: req-42
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CHECK ok : a subtask forked from a StructuredTaskScope opened while REQUEST_ID is bound DOES see "req-42"
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exit=0
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