* @param size the maximum number of items to return
     * @return a PagingList containing the requested subset of mapping items
     */
    @Override
    public synchronized PagingList<CharMappingItem> selectList(final int offset, final int size) {
        if (mappingItemList == null) {
            reload(null);
        }

        if (offset >= mappingItemList.size() || offset < 0) {

    }

    @Override
    public synchronized void insert(final StemmerOverrideItem item) {
        try (StemmerOverrideUpdater updater = new StemmerOverrideUpdater(item)) {
            reload(updater);
        }
    }

    @Override
    public synchronized void update(final StemmerOverrideItem item) {

     */
    protected short getSystemCpuPercent() {
        final long now = getCurrentTimeAsLong();
        if (now - systemCpuCheckTime > systemCpuCheckInterval) {
            synchronized (this) {
                if (now - systemCpuCheckTime > systemCpuCheckInterval) {
                    try {
                        final OsProbe osProbe = OsProbe.getInstance();