{
  "assetKey": "a11-f001-close-leak",
  "kind": "terminal",
  "command": "set -e\nD=$(mktemp -d); trap 'rm -rf \"$D\"' EXIT\nH=/shared/codebase/clean-architecture-backend-template/src/adapter/outbound/httpclient\nJAR=$H/build/libs/httpclient-0.0.1+21234e38cdb9.jar\njava -version 2>&1 | head -1\njavac -encoding UTF-8 -cp \"$JAR\" -d \"$D\" \\\n  \"$H/src/testkit/java/dev/caskeleton/adapter/outbound/httpclient/testkit/ClientProfiles.java\"\ncat > \"$D/DrainThreadProbe.java\" <<'JAVA'\nimport dev.caskeleton.adapter.outbound.httpclient.profile.ClientRuntime;\nimport dev.caskeleton.adapter.outbound.httpclient.profile.ClientRuntimeLease;\nimport dev.caskeleton.adapter.outbound.httpclient.profile.ClientRuntimeRegistry;\nimport dev.caskeleton.adapter.outbound.httpclient.profile.ClientRuntimeState;\nimport dev.caskeleton.adapter.outbound.httpclient.profile.RuntimeGeneration;\nimport dev.caskeleton.adapter.outbound.httpclient.testkit.ClientProfiles;\nimport java.time.Duration;\nimport java.util.Map;\nimport java.util.concurrent.atomic.AtomicInteger;\n\npublic final class DrainThreadProbe {\n\n  private static final String DRAIN = \"httpclient-runtime-drain\";\n\n  private static ClientRuntime runtime(long generation, Runnable closer) {\n    return new ClientRuntime(\n        ClientProfiles.builder(\"payment\").build(), new RuntimeGeneration(generation), closer);\n  }\n\n  private static long drainThreads() {\n    return Thread.getAllStackTraces().keySet().stream()\n        .filter(t -> t.getName().startsWith(DRAIN))\n        .count();\n  }\n\n  private static String close(ClientRuntimeRegistry registry) {\n    try {\n      registry.close();\n      return \"정상 반환\";\n    } catch (RuntimeException failure) {\n      return failure.getClass().getSimpleName() + \": \" + failure.getMessage();\n    }\n  }\n\n  /** The shape the resource-bound suite rotates in: no lease is held. */\n  private static void suiteShape() {\n    System.out.println(\"[자원 경계 묶음이 도는 모양] 임차를 쥐지 않고 회전한다\");\n    AtomicInteger closed = new AtomicInteger();\n    ClientRuntime first = runtime(1, closed::incrementAndGet);\n    long peak = 0;\n    try (ClientRuntimeRegistry registry = new ClientRuntimeRegistry(Map.of(first.name(), first))) {\n      for (int generation = 2; generation <= 50; generation++) {\n        registry.swap(first.name(), runtime(generation, closed::incrementAndGet), Duration.ofSeconds(1));\n        peak = Math.max(peak, drainThreads());\n      }\n    }\n    System.out.println(\"  회전 49회 동안 관측된 drain 스레드 최대치 : \" + peak);\n    System.out.println(\"  닫힌 세대 : \" + closed.get() + \" / close() 후 drain 스레드 : \" + drainThreads());\n    System.out.println();\n  }\n\n  /** The path the record describes: one forceClose throws. */\n  private static void refusingPool() {\n    System.out.println(\"[강제 닫기 하나가 던지는 경로]\");\n    AtomicInteger released = new AtomicInteger();\n    ClientRuntime first = runtime(1, () -> {});\n    ClientRuntime second =\n        runtime(\n            2,\n            () -> {\n              released.incrementAndGet();\n              throw new IllegalStateException(\"pool refused to close\");\n            });\n    ClientRuntimeRegistry registry = new ClientRuntimeRegistry(Map.of(first.name(), first));\n    ClientRuntimeLease lease = registry.acquire(first.name());\n    registry.swap(first.name(), second, Duration.ofSeconds(30));\n    System.out.println(\"  swap 직후 drain 스레드 : \" + drainThreads());\n    System.out.println(\"  1회차 close() : \" + close(registry) + \" / drain 스레드 \" + drainThreads());\n    System.out.println(\"  거부한 런타임 state : \" + second.state()\n        + \" / 자원 닫기 호출 \" + released.get() + \"회\");\n    second.forceClose();\n    System.out.println(\"  다시 forceClose 후 자원 닫기 호출 : \" + released.get() + \"회\");\n    System.out.println(\"  2회차 close() : \" + close(registry) + \" / drain 스레드 \" + drainThreads());\n    lease.close();\n    System.out.println();\n  }\n\n  /** No forceClose fails, yet the thread survives: the shutdown block throws on its own. */\n  private static void slowScheduler() throws Exception {\n    System.out.println(\"[강제 닫기가 하나도 던지지 않는데 스레드가 남는 경로]\");\n    ClientRuntime first =\n        runtime(\n            1,\n            () -> {\n              long until = System.nanoTime() + Duration.ofSeconds(8).toNanos();\n              while (System.nanoTime() < until) {\n                try {\n                  Thread.sleep(50);\n                } catch (InterruptedException ignored) {\n                  // The pool's own close ignores the interrupt, which shutdownNow can only send.\n                }\n              }\n            });\n    ClientRuntime second = runtime(2, () -> {});\n    ClientRuntimeRegistry registry = new ClientRuntimeRegistry(Map.of(first.name(), first));\n    ClientRuntimeLease lease = registry.acquire(first.name());\n    registry.swap(first.name(), second, Duration.ofMillis(50));\n    Thread.sleep(400);\n    System.out.println(\"  마감 작업이 도는 중 drain 스레드 : \" + drainThreads());\n    long started = System.nanoTime();\n    String outcome = close(registry);\n    long elapsed = (System.nanoTime() - started) / 1_000_000L;\n    System.out.println(\"  강제 닫기가 던진 것 : 없음\");\n    System.out.println(\"  1회차 close() : \" + outcome + \"  (\" + elapsed + \"ms)\");\n    System.out.println(\"  1회차 후 drain 스레드 : \" + drainThreads());\n    System.out.println(\"  2회차 close() : \" + close(registry) + \" / drain 스레드 \" + drainThreads());\n    lease.close();\n  }\n\n  public static void main(String[] args) throws Exception {\n    System.out.println(\"test 가 검증하는 성질 : close() 뒤에 \" + DRAIN + \" 스레드가 없어야 한다\");\n    System.out.println();\n    suiteShape();\n    refusingPool();\n    slowScheduler();\n  }\n}\nJAVA\njavac -encoding UTF-8 -cp \"$JAR:$D\" -d \"$D\" \"$D/DrainThreadProbe.java\"\njava -Dstdout.encoding=UTF-8 -cp \"$JAR:$D\" DrainThreadProbe\n",
  "cwd": "/shared/codebase/clean-architecture-backend-template/src/adapter/outbound/httpclient",
  "exitCode": 0,
  "executedAt": "2026-09-02T13:21:50+00:00",
  "sourceRevision": "21234e38cdb9a926cbc92bb97a2aee2e4a7d2916",
  "raw": "evidence/raw/a11-f001-close-leak.txt",
  "svg": "evidence/rendered/a11-f001-close-leak.svg",
  "rawSha256": "c953ce70bba5f0a05e085b80ac3321768ed80d9742ed6303e40f82448b825d39",
  "lines": 20,
  "redaction": "none — 밀폐 탐침 실행 출력, 자격증명 없음"
}