if (available) {
                cb.query().setAvailable_Equal(Constants.T);
            }
            if (idList != null) {
                cb.query().setId_InScope(idList);
            }
            cb.query().setName_NotEqual(ComponentUtil.getFessConfig().getFormAdminDefaultTemplateName());
            cb.query().addOrderBy_SortOrder_Asc();

            final List<UserInfo> updateList = new ArrayList<>();
            final UserInfoBhv userInfoBhv = ComponentUtil.getComponent(UserInfoBhv.class);
            userInfoBhv.selectList(cb -> {
                cb.query().setId_InScope(userInfoMap.keySet());
                cb.fetchFirst(userInfoMap.size());
            }).forEach(userInfo -> {
                final String code = userInfo.getId();

            }
        });

        if (!idList.isEmpty()) {
            thumbnailQueueBhv.queryDelete(cb -> {
                cb.query().setId_InScope(idList);
            });
            thumbnailQueueBhv.refresh();
        }
        return idList.size();
    }

    /**
     * Processes a single thumbnail generation task.
     *