executors: ExecutorService lifecycle companion code

Adds the executors module: shutdown() vs shutdownNow(), the graceful
two-phase shutdown pattern, AutoCloseable/try-with-resources (JDK 19+),
newVirtualThreadPerTaskExecutor() timing vs a bounded pool, and the
submit()-without-get() lost-exception trap. 5 runnable demos, 1 JUnit
correctness test class (23 tests), 6 captured output transcripts.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01FhzLY5p6okFva3qsnsRyvM
This commit is contained in:
2026-09-30 06:54:17 +00:00
co-authored by Claude Sonnet 5
parent 55ee850a75
commit bc5153d2a5
17 changed files with 607 additions and 0 deletions
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Test set: com.ankurm.executors.ExecutorShutdownBehaviorTest
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Tests run: 23, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.417 s -- in com.ankurm.executors.ExecutorShutdownBehaviorTest