while (!finishCrawling || !accessResultList.isEmpty()) {
                try {
                    final int sessionIdListSize = finishedSessionIdList.size();
                    intervalControlHelper.setCrawlerRunning(true);

                    docList.clear();
                    accessResultList.clear();

                    updateTime = systemHelper.getCurrentTimeAsLong() - updateTime;

        }
    }

    private static class TestIntervalControlHelper extends IntervalControlHelper {
        private boolean crawlerRunning = true;

        @Override
        public void setCrawlerRunning(boolean running) {
            this.crawlerRunning = running;
        }

        @Override
        public boolean isCrawlerRunning() {
            return crawlerRunning;
        }