private ScheduledFuture<@Nullable Void> submitToExecutor(Schedule schedule) {
        return executor.schedule(this, schedule.delay, schedule.unit);
      }
    }

    /**
     * Contains the most recently submitted {@code Future}, which may be cancelled or updated,
     * always under a lock.
     */
    private static final class SupplantableFuture implements Cancellable {
      private final ReentrantLock lock;

    }

    /**
     * Retrieves scheduler settings with pagination.
     *
     * @param body the search parameters for filtering and pagination
     * @return JSON response containing scheduler settings list
     */
    // GET /api/admin/scheduler
    // PUT /api/admin/scheduler
    @Execute
    public JsonResponse<ApiResult> settings(final SearchBody body) {

      private ScheduledFuture<@Nullable Void> submitToExecutor(Schedule schedule) {
        return executor.schedule(this, schedule.delay, schedule.unit);
      }
    }

    /**
     * Contains the most recently submitted {@code Future}, which may be cancelled or updated,
     * always under a lock.
     */
    private static final class SupplantableFuture implements Cancellable {
      private final ReentrantLock lock;

            ThreadUtil.sleep(500);
            count++;
            final Map<String, Object> scheduler = getSchedulerItem(namePrefix);
            assertTrue(scheduler.containsKey("running"));
            isRunning = (Boolean) scheduler.get("running");
        }
        if (300 <= count) {
            logger.info("Time out: Failed to start crawler)");
            fail(); // Time Out

    /**
     * Shutdown the directory lease manager
     */
    public void shutdown() {
        scheduler.shutdown();
        try {
            if (!scheduler.awaitTermination(5, TimeUnit.SECONDS)) {
                scheduler.shutdownNow();
            }
        } catch (InterruptedException e) {
            scheduler.shutdownNow();
            Thread.currentThread().interrupt();
        }

        this.asyncNotifyTasks = new ConcurrentHashMap<>();
        this.scheduler = Executors.newScheduledThreadPool(3); // Increased for async notifications
        this.rpcClient = rpcClient;

        // Schedule periodic tasks
        schedulePeriodicTasks();
    }

    /**
     * Schedules periodic tasks for heartbeat and registration monitoring.
     */

import jakarta.annotation.Resource;

/**
 * Admin action for Scheduler management.
 *
 */
public class AdminSchedulerAction extends FessAdminAction {

    /**
     * Default constructor.
     */
    public AdminSchedulerAction() {
        super();
    }

    /** Role name for admin scheduler operations */
    public static final String ROLE = "admin-scheduler";

        this.listeners = new ConcurrentHashMap<>();
        this.scheduler = Executors.newScheduledThreadPool(2);
        this.rpcClient = new WitnessRpcClient(witnessServer, context);
        
        // Schedule periodic tasks
        schedulePeriodicTasks();
    }
    
    private void schedulePeriodicTasks() {
        // Heartbeat monitoring
        scheduler.scheduleAtFixedRate(this::checkHeartbeats, 30, 30, TimeUnit.SECONDS);

            log.error("Failed to create handle state directory: " + stateDirectory, e);
        }

        // Load persisted handles on startup
        loadPersistedHandles();

        // Schedule periodic persistence and cleanup
        scheduler.scheduleAtFixedRate(this::periodicMaintenance, 30, 30, TimeUnit.SECONDS);
    }

    /**
     * Request a new durable handle
     * @param path the file path
     * @param type the handle type

    /** The path of the HTML: /admin/scheduler/admin_scheduler.jsp */
    HtmlNext path_AdminScheduler_AdminSchedulerJsp = new HtmlNext("/admin/scheduler/admin_scheduler.jsp");

    /** The path of the HTML: /admin/scheduler/admin_scheduler_details.jsp */
    HtmlNext path_AdminScheduler_AdminSchedulerDetailsJsp = new HtmlNext("/admin/scheduler/admin_scheduler_details.jsp");