default void setDayForCleanup(final int value) {
        setSystemPropertyAsInt(Constants.DAY_FOR_CLEANUP_PROPERTY, value);
    }

    default int getDayForCleanup() {
        return getSystemPropertyAsInt(Constants.DAY_FOR_CLEANUP_PROPERTY, Constants.DEFAULT_DAY_FOR_CLEANUP);
    }

    default void setCrawlingThreadCount(final int value) {
        setSystemPropertyAsInt(Constants.CRAWLING_THREAD_COUNT_PROPERTY, value);
    }