*       implementation will effectively put the whole file in memory. On many systems with paging
   *       and virtual memory, this is not a problem - because it is mapped read-only, the kernel
   *       can always page it to disk "for free". However, on systems where killing processes
   *       happens all the time in normal conditions (i.e., android) the OS must make a tradeoff

   * concurrently readable hash table. The map supports non-blocking reads and concurrent writes
   * across different segments.
   *
   * The page replacement algorithm's data structures are kept casually consistent with the map. The
   * ordering of writes to a segment is sequentially consistent. An update to the map and recording

    public Integer page = Constants.DEFAULT_ADMIN_PAGE_NUMBER;

    public int getPageSize() {
        if (size != null) {
            return size;
        }
        return ComponentUtil.getFessConfig().getPagingPageSizeAsInteger();
    }

    public int getCurrentPageNumber() {
        if (page != null) {
            return page;
        }
        return Constants.DEFAULT_ADMIN_PAGE_NUMBER;

                    file.selectList((protwordsPager.getCurrentPageNumber() - 1) * pageSize, pageSize);

            // update pager
            BeanUtil.copyBeanToBean(protwordsList, protwordsPager, option -> option.include(Constants.PAGER_CONVERSION_RULE));
            protwordsList.setPageRangeSize(fessConfig.getPagingPageRangeSizeAsInteger());

                    file.selectList((stopwordsPager.getCurrentPageNumber() - 1) * pageSize, pageSize);

            // update pager
            BeanUtil.copyBeanToBean(stopwordsList, stopwordsPager, option -> option.include(Constants.PAGER_CONVERSION_RULE));
            stopwordsList.setPageRangeSize(fessConfig.getPagingPageRangeSizeAsInteger());

        final PathMapPager pager = copyBeanToNewBean(body, PathMapPager.class);
        final List<PathMapping> list = pathMappingService.getPathMappingList(pager);
        return asJson(
                new ApiResult.ApiConfigsResponse<EditBody>().settings(list.stream().map(this::createEditBody).collect(Collectors.toList()))
                        .total(pager.getAllRecordCount()).status(ApiResult.Status.OK).result());
    }

        validateApi(body, messages -> {});
        final UserPager pager = copyBeanToNewBean(body, UserPager.class);
        final List<User> list = userService.getUserList(pager);
        return asJson(
                new ApiResult.ApiConfigsResponse<EditBody>().settings(list.stream().map(this::createEditBody).collect(Collectors.toList()))
                        .total(pager.getAllRecordCount()).status(ApiResult.Status.OK).result());
    }

            setupListCondition(cb, boostDocumentRulePager);
        });

        // update pager
        BeanUtil.copyBeanToBean(boostDocumentRuleList, boostDocumentRulePager, option -> option.include(Constants.PAGER_CONVERSION_RULE));
        boostDocumentRulePager.setPageNumberList(

            setupListCondition(cb, webAuthenticationPager);
        });

        // update pager
        BeanUtil.copyBeanToBean(webAuthenticationList, webAuthenticationPager, option -> option.include(Constants.PAGER_CONVERSION_RULE));
        webAuthenticationPager.setPageNumberList(webAuthenticationList.pageRange(op -> {

        final RelatedQueryPager pager = copyBeanToNewBean(body, RelatedQueryPager.class);
        final List<RelatedQuery> list = relatedQueryService.getRelatedQueryList(pager);
        return asJson(
                new ApiResult.ApiConfigsResponse<EditBody>().settings(list.stream().map(this::createEditBody).collect(Collectors.toList()))
                        .total(pager.getAllRecordCount()).status(ApiResult.Status.OK).result());