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Add structured-concurrency-final module: StructuredTaskScope final in JDK 28 (JEP 543), run on 28-ea, 27, 26 and 25

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Runnable demos for the ankurm.com structured-concurrency-java article: the ExecutorService thread leak and its fix, every built-in Joiner,
structure violations, timeouts, a custom Joiner, JSON thread dumps (in-process and jcmd), scoped values, javap diffs of the API on 25, 26, 27 and 28-ea,
compiler output for six pieces of 25/26-era code, and the preview class-file trap between 27 and 28. Transcripts in output/.

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01CifR2BE7PBvRy5hT8TS9oz
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Claude
2026-10-26 02:01:31 +00:00
parent 2e25042a68
commit c93a1fffbb
37 changed files with 1351 additions and 0 deletions
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structured-concurrency-final/broken/OldJoiner.java
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import java.util.List;
import java.util.concurrent.*;
import java.util.concurrent.StructuredTaskScope.Joiner;
import java.util.concurrent.StructuredTaskScope.Subtask;
/** A custom Joiner as written for JDK 26: two type parameters and onTimeout(). */
public class OldJoiner<T> implements Joiner<T, List<T>> {
private final java.util.Queue<T> results = new ConcurrentLinkedQueue<>();
public boolean onComplete(Subtask<T> s) { if (s.state() == Subtask.State.SUCCESS) results.add(s.get()); return false; }
public void onTimeout() { }
public List<T> result() { return List.copyOf(results); }
}