示例#1
0
        /// <summary>
        /// 重建索引
        /// </summary>
        public void RebuildIndex()
        {
            //pageSize参数决定了每次批量取多少条数据进行索引。要注意的是,如果是分布式搜索,客户端会将这部分数据通过WCF传递给服务器端,而WCF默认的最大传输数据量是65535B,pageSize较大时这个设置显然是不够用的,WCF会报400错误;系统现在将最大传输量放宽了,但仍要注意一次不要传输过多,如遇异常,可适当调小pageSize的值
            int       pageSize     = 1000;
            int       pageIndex    = 1;
            long      totalRecords = 0;
            bool      isBeginning  = true;
            bool      isEndding    = false;
            UserQuery query        = new UserQuery();

            long     followedUserId = 0;
            Document doc            = null;

            do
            {
                //分页获取粉丝列表
                PagingDataSet <User> users = userService.GetUsers(query, pageSize, pageIndex);

                totalRecords = users.TotalRecords;
                IEnumerable <long> followerUserIds = users.Select(n => n.UserId);

                isEndding = (pageSize * pageIndex < totalRecords) ? false : true;

                //根据粉丝列表批量查询关注用户列表
                IEnumerable <FollowEntity> followedUsers = followService.GetFollowedUsers(followerUserIds);

                //循环关注用户列表(已按照UserId排序),对每个UserId建立索引
                List <Document> docs = new List <Document>();
                foreach (FollowEntity followedUser in followedUsers)
                {
                    //判断当前记录的被关注用户的ID是否与上一条的被关注用户的ID相同。
                    //如果相同,说明属于同一个用户的关注对象
                    if (followedUser.UserId == followedUserId)
                    {
                        doc.Add(new Field(FollowedUserIds, followedUser.FollowedUserId.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));
                    }
                    else
                    {
                        //fixed by jiangshl

                        //对于下一个用户,需要重新构建Document对象
                        doc = new Document();
                        doc.Add(new Field(UserId, followedUser.UserId.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));
                        doc.Add(new Field(FollowedUserIds, followedUser.FollowedUserId.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));
                        docs.Add(doc);

                        followedUserId = followedUser.UserId;
                    }
                }

                searchEngine.RebuildIndex(docs, isBeginning, isEndding);

                isBeginning = false;
                pageIndex++;
            }while (!isEndding);
        }