* Cancels the task.
     */
    public void cancel() {
        status = CANCELED;
    }

    /**
     * Returns whether the task is stopped.
     *
     * @return whether the task is stopped
     */
    public boolean isStopped() {
        return status == STOPPED;
    }

    /**
     * Stops the timer.
     */
    public void stop() {
        if (status != ACTIVE) {

            final TimeoutTask task = e.getElement();
            if (task.isCanceled()) {
                e.remove();
            } else if (!task.isStopped() && task.isExpired()) {
                expiredTask.add(task);
                if (!task.isPermanent()) {
                    e.remove();
                }
            }
        }
        return expiredTask;

        } catch (final ContainerNotAvailableException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("SuggestCreator is stopped.", e);
            } else if (logger.isInfoEnabled()) {
                logger.info("SuggestCreator is stopped.");
            }
            exitCode = Constants.EXIT_FAIL;
        } catch (final Throwable t) {

        } catch (final ContainerNotAvailableException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("ThumbnailGenerator is stopped.", e);
            } else if (logger.isInfoEnabled()) {
                logger.info("ThumbnailGenerator is stopped.");
            }
            exitCode = Constants.EXIT_FAIL;
        } catch (final Throwable t) {

            } catch (InterruptedException e) {
                Thread.currentThread().interrupt();
            }
        }

        registrations.clear();
        log.info("Mock witness service stopped");
    }

    /**
     * Get the address the service is listening on
     *
     * @return the service address
     * @throws IOException if address cannot be determined
     */

    }

    /**
     * Stops the timeout target by setting the running flag to false.
     */
    public void stop() {
        if (logger.isDebugEnabled()) {
            logger.debug("Timeout target has been stopped.");
        }
        running.set(false);
    }

                } finally {
                    if (systemHelper.isForceStop()) {
                        finishCrawling = true;
                        if (logger.isDebugEnabled()) {
                            logger.debug("Stopped indexUpdater.");
                        }
                    }
                }

                if (emptyListCount >= maxEmptyListCount) {
                    if (logger.isInfoEnabled()) {

        CompletableFuture<Void> task = asyncNotifyTasks.remove(registrationId);
        if (task != null) {
            task.cancel(true);
            log.debug("Stopped async notification monitoring for {}", registrationId);
        }
    }

    /**
     * Processes an async notification message and converts it to a WitnessNotification.
     *

        } catch (final ContainerNotAvailableException e) {
            if (logger.isDebugEnabled()) {
                logger.debug("Crawler is stopped.", e);
            } else if (logger.isInfoEnabled()) {
                logger.info("Crawler is stopped.");
            }
            exitCode = Constants.EXIT_FAIL;
        } catch (final Throwable t) {
            logger.error("Crawler terminated unexpectedly.", t);

     */
    public void stopProactiveHealthChecking() {
        if (healthCheckTask != null) {
            healthCheckTask.cancel(false);
            healthCheckTask = null;
            log.info("Stopped proactive health checking");
        }
    }

    /**
     * Perform proactive health check on all connections
     */
    private void performProactiveHealthCheck() {