java.util.concurrent.Executors#newFixedThreadPool(int)
java.util.concurrent.Executors#newSingleThreadExecutor()
java.util.concurrent.Executors#newCachedThreadPool()
java.util.concurrent.Executors#newSingleThreadScheduledExecutor()
java.util.concurrent.Executors#newScheduledThreadPool(int)
java.util.concurrent.Executors#defaultThreadFactory()
java.util.concurrent.Executors#privilegedThreadFactory()

  public void testScheduleAsync_asyncCallable_nullInsteadOfFuture() throws Exception {
    ExecutorService service = newSingleThreadScheduledExecutor();
    ListenableFuture<?> chainedFuture =
        scheduleAsync(() -> null, 1, NANOSECONDS, newSingleThreadScheduledExecutor());
    ExecutionException expected = assertThrows(ExecutionException.class, () -> chainedFuture.get());

  public void testScheduleAsync_asyncCallable_nullInsteadOfFuture() throws Exception {
    ExecutorService service = newSingleThreadScheduledExecutor();
    ListenableFuture<?> chainedFuture =
        scheduleAsync(() -> null, 1, NANOSECONDS, newSingleThreadScheduledExecutor());
    ExecutionException expected = assertThrows(ExecutionException.class, () -> chainedFuture.get());

        this.lockoutDuration = lockoutDuration;
        this.cleanupInterval = cleanupInterval;

        // Start cleanup scheduler
        this.cleanupScheduler = Executors.newSingleThreadScheduledExecutor(r -> {
            Thread t = new Thread(r, "AuthRateLimiter-Cleanup");
            t.setDaemon(true);
            return t;
        });

            Thread t = new Thread(r, "ResourceManager-Cleanup");
            t.setDaemon(true);
            return t;
        };
        cleanupExecutor = Executors.newSingleThreadScheduledExecutor(threadFactory);

        // Add shutdown hook for cleanup
        Runtime.getRuntime().addShutdownHook(new Thread(this::shutdown, "ResourceManager-Shutdown"));

        startCleanupTask();
    }

    private long lastHealthCheck = System.currentTimeMillis();

    // Advanced health monitoring
    private final ScheduledExecutorService healthCheckExecutor = Executors.newSingleThreadScheduledExecutor(r -> {
        Thread t = new Thread(r, "SmbTransportPool-HealthCheck");
        t.setDaemon(true);
        return t;
    });
    private ScheduledFuture<?> healthCheckTask;

        this.fileCache = new ConcurrentHashMap<>();
        this.lock = new ReentrantReadWriteLock();

        // Start cleanup executor for expired leases
        this.cleanupExecutor = Executors.newSingleThreadScheduledExecutor(r -> {
            Thread t = new Thread(r, "LeaseManager-Cleanup");
            t.setDaemon(true);
            return t;
        });

        // Schedule periodic cleanup

    private final Map<String, Integer> keyVersions = new ConcurrentHashMap<>();
    private final java.util.concurrent.ScheduledExecutorService rotationScheduler =
            java.util.concurrent.Executors.newSingleThreadScheduledExecutor(r -> {
                Thread t = new Thread(r, "SecureKeyManager-Rotation");
                t.setDaemon(true);
                return t;
            });

      @Override
      public Thread newThread(Runnable runnable) {
        return MoreExecutors.newThread(serviceName(), runnable);
      }
    }
    ScheduledExecutorService executor =
        Executors.newSingleThreadScheduledExecutor(new ThreadFactoryImpl());
    // Add a listener to shut down the executor after the service is stopped. This ensures that the
    // JVM shutdown will not be prevented from exiting after this service has stopped or failed.