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

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
2026-10-26 02:01:31 +00:00
parent 2e25042a68
commit c93a1fffbb
37 changed files with 1351 additions and 0 deletions
@@ -0,0 +1,21 @@
+$ javac src/Joiners.java && java Joiners     (28-beta+21-ea)
+-- allSuccessfulOrThrow(): List in FORK order, not completion order
+  [slow, fast, medium]
+-- allSuccessfulOrThrow(): one failure cancels the others, join() throws ExecutionException
+  ExecutionException, cause = java.lang.IllegalStateException: broken failed
+  interrupted: [slow]
+-- anySuccessfulOrThrow(): the race; losers are interrupted
+  winner: B-50ms
+  interrupted: [A-300ms, C-300ms]
+-- anySuccessfulOrThrow(): when every subtask fails
+  ExecutionException, cause = java.lang.IllegalStateException: one failed
+-- awaitAllSuccessfulOrThrow(): returns null (Void), like the zero-argument open()
+  join() = null, a=a, b=b
+-- allUntil(predicate): stop when two subtasks have completed
+  SUCCESS t1
+  SUCCESS t2
+  UNAVAILABLE
+  UNAVAILABLE
+  interrupted: [t3, t4]
+-- the Function overload: join() throws OUR exception type
+  caught ServiceException: service call failed: orders failed