* Any {@link InterruptedException} is caught and logged at debug level.
     *
     * @param millis
     *            the length of time to sleep in milliseconds
     */
    public static void sleepQuietly(final long millis) {
        if (millis < 1L) {
            return;
        }
        try {
            Thread.sleep(millis);
        } catch (final InterruptedException e) {

    @Test
    public void test_sleep() throws Exception {
        ThreadUtil.sleep(1L);
        assertTrue(true);
        ThreadUtil.sleepQuietly(1L);
    }

    /**
     * @throws Exception
     */
    @Test
    public void test_sleepQuietly() throws Exception {
        ThreadUtil.sleepQuietly(1L);
        assertTrue(true);
    }

            if (logger.isDebugEnabled()) {
                logger.debug("Interrupt {}", runningThread);
            }
            runningThread.interrupt();
            ThreadUtil.sleepQuietly(1000L);
            count++;
        }
    }

    /**
     * Stops the timeout target by setting the running flag to false.
     */
    public void stop() {
        if (logger.isDebugEnabled()) {

        return readInterval;
    }

    /**
     * Sleep for the specified interval.
     * @param interval The interval.
     */
    protected void sleep(final long interval) {
        ThreadUtil.sleepQuietly(interval);
    }

    /**
     * Store the data.
     * @param dataConfig The data configuration.
     * @param callback The callback.
     * @param paramMap The parameters.

        /**
         * Runs the monitor thread, sleeping for the timeout duration and terminating the process if needed.
         */
        @Override
        public void run() {
            ThreadUtil.sleepQuietly(timeout);

            if (!finished) {
                try {
                    process.destroy();
                    teminated = true;
                } catch (final Exception e) {

     * This method blocks until the crawler is running again.
     */
    public void checkCrawlerStatus() {
        while (!crawlerRunning) {
            ThreadUtil.sleepQuietly(crawlerWaitMillis);
        }
    }

    /**
     * Applies delay based on the configured interval rules.
     * This method calculates the appropriate delay for the current time