assertExecutionException(future, ex);
    assertEquals(5, runnable.count);
    assertEquals(0, delegate.getQueue().size());

    runnable = new ThrowingRunnable(5, ex);
    future = service.scheduleWithFixedDelay(runnable, 1, 1, MILLISECONDS);
    assertExecutionException(future, ex);
    assertEquals(5, runnable.count);
    assertEquals(0, delegate.getQueue().size());
  }

   * @author Luke Sandberg
   * @since 11.0
   */
  public abstract static class Scheduler {
    /**
     * Returns a {@link Scheduler} that schedules the task using the {@link
     * ScheduledExecutorService#scheduleWithFixedDelay} method.
     *
     * @param initialDelay the time to delay first execution
     * @param delay the delay between the termination of one execution and the commencement of the
     *     next

     * Start the cleanup task
     */
    private void startCleanupTask() {
        if (cleanupTask != null) {
            cleanupTask.cancel(false);
        }

        cleanupTask = cleanupExecutor.scheduleWithFixedDelay(() -> {
            try {
                checkForLeaks();
                performCleanup();
            } catch (Exception e) {
                log.error("Error during resource cleanup", e);
            }

            Thread t = new Thread(r, "AuthRateLimiter-Cleanup");
            t.setDaemon(true);
            return t;
        });

        cleanupScheduler.scheduleWithFixedDelay(this::cleanup, cleanupInterval.toMillis(), cleanupInterval.toMillis(),
                TimeUnit.MILLISECONDS);

        }
        log.info("[{}] Circuit breaker closed and resources cleaned up", name);
    }

    private void startDynamicThresholdAdjustment() {
        thresholdAdjustmentTask = scheduler.scheduleWithFixedDelay(this::performDynamicThresholdAdjustment, 30, 30, TimeUnit.SECONDS);
        log.debug("[{}] Started dynamic threshold adjustment task", name);
    }

    private void performDynamicThresholdAdjustment() {

            throw new CIFSException("Failed to create CIFSContext for multi-channel transport", e);
        }
    }

    private void startHealthCheckTask() {
        healthCheckExecutor.scheduleWithFixedDelay(this::performHealthCheck, healthCheckInterval, healthCheckInterval,
                TimeUnit.MILLISECONDS);
    }

    private void performHealthCheck() {

        if (cleanupInterval <= 0) {
            cleanupInterval = DEFAULT_LEASE_CLEANUP_INTERVAL;
        }

        final long finalCleanupInterval = cleanupInterval;
        this.cleanupExecutor.scheduleWithFixedDelay(() -> cleanupExpiredLeases(finalCleanupInterval * 2), cleanupInterval, cleanupInterval,
                TimeUnit.MILLISECONDS);
    }

    /**
     * Lease entry containing lease state information
     */

     * Start proactive health checking
     */
    private void startProactiveHealthChecking() {
        if (proactiveHealthCheckEnabled && healthCheckTask == null) {
            healthCheckTask = healthCheckExecutor.scheduleWithFixedDelay(this::performProactiveHealthCheck, proactiveCheckInterval,
                    proactiveCheckInterval, TimeUnit.MILLISECONDS);

        if (rotationTask != null) {
            rotationTask.cancel(false);
        }

        // Schedule new rotation task
        if (intervalMillis > 0) {
            rotationTask = rotationScheduler.scheduleWithFixedDelay(this::rotateExpiredKeys, intervalMillis, intervalMillis,
                    java.util.concurrent.TimeUnit.MILLISECONDS);
            log.info("Key rotation configured with interval: {} ms", intervalMillis);
        }