private static SystemHelper systemHelper;

    private static FessConfig fessConfig;

    private static List<Runnable> initProcesses = new ArrayList<>();

    private ComponentUtil() {
    }

    public static void processAfterContainerInit(final Runnable process) {
        if (available()) {
            process.run();
        } else {
            initProcesses.add(process);
        }

    //                                                                        ============
    protected void async(final AsyncManager asyncManager, final Runnable runnable) {
        asyncManager.async(new ConcurrentAsyncCall() {
            @Override
            public void callback() {
                runnable.run();
            }

            @Override
            public boolean asPrimary() {

            return curlHelper.delete(path);
        default:
            break;
        }
        return null;
    }

    private HtmlResponse asListHtml(final Runnable runnable) {
        if (runnable != null) {
            runnable.run();
        }
        return asHtml(path_AdminEsreq_AdminEsreqJsp).useForm(UploadForm.class);
    }

    protected LoadingCache<String, List<Map<String, String>>> langItemsCache;

    protected String filterPathEncoding;

    protected String[] supportedLanguages;

    protected List<Runnable> shutdownHookList = new ArrayList<>();

    protected AtomicInteger previousClusterState = new AtomicInteger(0);

    protected String version;

    protected int majorVersion;

            Thread webFsCrawlerThread = null;
            Thread dataCrawlerThread = null;

            if (runAll || webConfigIdList != null || fileConfigIdList != null) {
                webFsCrawlerThread = new Thread((Runnable) () -> {
                    // crawl web
                    writeTimeToSessionInfo(crawlingInfoHelper, Constants.WEB_FS_CRAWLER_START_TIME);

        thumbnailTaskQueue = new LinkedBlockingQueue<>(thumbnailTaskQueueSize);
        generating = !Constants.TRUE.equalsIgnoreCase(System.getProperty("fess.thumbnail.process"));
        thumbnailQueueThread = new Thread((Runnable) () -> {
            final List<Tuple3<String, String, String>> taskList = new ArrayList<>();
            while (generating) {
                try {

            }
        } catch (final Exception e) {
            logger.warn("Failed to flush config files.", e);
        }
    }

    public void flushConfigFiles(final Runnable callback) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        final String fesenType = fessConfig.getFesenType();
        switch (fesenType) {
        case Constants.FESEN_TYPE_CLOUD:

appearance:none;appearance:none}@media (prefers-reduced-motion:reduce){.custom-range::-webkit-slider-thumb{-webkit-transition:none;transition:none}}.custom-range::-webkit-slider-thumb:active{background-color:#b3d7ff}.custom-range::-webkit-slider-runnable-track{width:100%;height:.5rem;color:transparent;cursor:pointer;background-color:#dee2e6;border-color:transparent;border-radius:1rem}.custom-range::-moz-range-thumb{width:1rem;height:1rem;background-color:#007bff;border:0;border-radius:1rem;-moz-...

appearance:none;appearance:none}@media (prefers-reduced-motion:reduce){.custom-range::-webkit-slider-thumb{-webkit-transition:none;transition:none}}.custom-range::-webkit-slider-thumb:active{background-color:#b3d7ff}.custom-range::-webkit-slider-runnable-track{width:100%;height:.5rem;color:transparent;cursor:pointer;background-color:#dee2e6;border-color:transparent;border-radius:1rem;box-shadow:inset 0 .25rem .25rem rgba(0,0,0,.1)}.custom-range::-moz-range-thumb{width:1rem;height:1rem;background...

(prefers-reduced-motion: reduce) {\n  .custom-range::-webkit-slider-thumb {\n    -webkit-transition: none;\n    transition: none;\n  }\n}\n\n.custom-range::-webkit-slider-thumb:active {\n  background-color: #b3d7ff;\n}\n\n.custom-range::-webkit-slider-runnable-track {\n  width: 100%;\n  height: 0.5rem;\n  color: transparent;\n  cursor: pointer;\n  background-color: #dee2e6;\n  border-color: transparent;\n  border-radius: 1rem;\n  box-shadow: inset 0 0.25rem 0.25rem rgba(0, 0, 0, 0.1);\n}\n\n.custom-ra...