asmhatre
f506b01389
Companion module for the rewritten post 'Virtual Threads on Spring Boot 4.1: The Benchmarks, Re-Run, and the Pinning Advice That Expired', retitled and re-benchmarked on Boot 4.1.1 / JDK 25.0.4.1 (the original post was written against Boot 3.4 / JDK 21). Covers: I/O-bound and CPU-bound throughput (platform vs virtual threads, including a JIT-warmup benchmarking bug this build caught and fixed), JEP 491 proof that synchronized no longer pins a virtual thread's carrier across a blocking call as of JDK 24 (obsoleting the old avoid-synchronized advice), proof that -Djdk.tracePinnedThreads=full is inert on JDK 25, and JEP 506's finalized ScopedValue API (JDK 25 GA, no --enable-preview, and a different shape than the old preview API). Kept as its own module rather than a new top-level repository, alongside the existing async/ module, which already has a stronger dual-JDK JEP 491 proof that this module's docs cross-link to instead of duplicating.
28 lines
999 B
Java
28 lines
999 B
Java
package com.ankurm.vthreads;
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import org.junit.jupiter.api.Test;
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import static org.assertj.core.api.Assertions.assertThat;
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/**
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* Confirms the finalized JDK 25 ScopedValue API (JEP 506) compiles and runs with no
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* --enable-preview flag, and that ScopedValue.where(...).call(...) actually threads the value
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* through to a method called from inside the scope. Output:
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* docs/output/03c-scoped-value-finalized.txt.
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*/
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class ScopedValueTest {
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@Test
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void whereRunThreadsContextThroughToCalledMethod() {
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Transcript t = Transcript.start("03c-scoped-value-finalized.txt",
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"ScopedValue (JEP 506, finalized JDK 25), JDK " + System.getProperty("java.version"));
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String result = ScopedValueDemo.runWithContext("req-42");
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t.line("ScopedValue.where(CTX, ctx).call(ScopedValueDemo::processRequest) -> " + result);
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t.line("no --enable-preview flag used on this run");
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t.save();
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assertThat(result).isEqualTo("handled req-42");
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}
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}
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