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);
    }

public class CommonPoolUtil {
    private static final Logger logger = Logger.getLogger(CommonPoolUtil.class);

    private CommonPoolUtil() {
        // nothing
    }

    public static void execute(final Runnable task) {
        ForkJoinPool.commonPool().execute(() -> {
            final Thread currentThread = Thread.currentThread();
            final ClassLoader orignal = currentThread.getContextClassLoader();

            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);

    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;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.log.Logger;

/**
 * Timerを扱うクラスです。
 *
 * @author higa
 *
 */
public class TimeoutManager implements Runnable {

    private static final Logger logger = Logger.getLogger(TimeoutManager.class);

    /**
     * シングルトンのためのインスタンスです。
     */
    protected static final TimeoutManager instance = new TimeoutManager();

        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: