/// <summary>
/// 搜索共同关注的人
/// </summary>
/// <param name="userId">粉丝的用户ID</param>
/// <param name="pageIndex">页码</param>
/// <param name="pageSize">分页大小</param>
/// <param name="followedUserIdDic">每个相同关注用户中共同关注的用户ID列表</param>
/// <param name="followedUserDic">每个共同关注的用户的ID与User的映射</param>
/// <returns>符合搜索条件的User分页集合</returns>
public PagingDataSet <User> SearchInterestedWithFollows(long userId, int pageIndex, int pageSize, out Dictionary <long, IEnumerable <long> > followedUserIdDic, out Dictionary <long, User> followedUserDic)
{
followedUserIdDic = new Dictionary <long, IEnumerable <long> >();
followedUserDic = new Dictionary <long, User>();
if (userId <= 0)
{
return(new PagingDataSet <User>(new List <User>()));
}
//先查询当前用户关注的人(包括“悄悄关注”的用户)，此处需要调用数据库查询，因为索引中没有存储“是否悄悄关注”属性
IEnumerable <long> myFollowedUserIds = followService.GetPortionFollowedUserIds(userId);
if (myFollowedUserIds != null && myFollowedUserIds.Count() == 0)
{
return(new PagingDataSet <User>(new List <User>()));
}
//黑名单用户
IEnumerable <long> stopUserIds = new PrivacyService().GetStopedUsers(userId).Select(n => n.Key);
//搜索“我”关注的人中包含“共同关注的人”的用户
//使用LuceneSearchBuilder构建Lucene需要Query、Filter、Sort
Query query = null;
Filter filter = null;
Sort sort = null;
LuceneSearchBuilder searchBuilder = new LuceneSearchBuilder();
searchBuilder.WithFields(FollowedUserIds, myFollowedUserIds.Select(n => n.ToString()), true)
.NotWithField(UserId, userId.ToString()) //排除掉当前用户
.NotWithFields(UserId, myFollowedUserIds.Select(n => n.ToString())) //排除掉已关注用户
.NotWithFields(UserIndexDocument.UserId, stopUserIds.Select(n => n.ToString())); //排除掉黑名单用户
searchBuilder.BuildQuery(out query, out filter, out sort);
PagingDataSet <Document> searchResult = searchEngine.Search(query, filter, sort, pageIndex, pageSize);
IEnumerable <Document> docs = searchResult.ToList <Document>();
if (docs == null || docs.Count() == 0)
{
return(new PagingDataSet <User>(new List <User>()));
}
List <long> sameFollowedUserIdList = new List <long>();
//解析出搜索结果中的用户ID
List <long> followerUserIds = new List <long>();
foreach (Document doc in docs)
{
long followerUserId = long.Parse(doc.Get(UserId));
followerUserIds.Add(followerUserId);
//“我”关注的人关注的人
string[] followedUserIds = doc.GetValues(FollowedUserIds);
//比较获取“共同关注的人”
IEnumerable <long> sameFollowedUserIds = myFollowedUserIds.Intersect <long>(followedUserIds.Select(n => Convert.ToInt64(n)));
if (!followedUserIdDic.ContainsKey(followerUserId))
{
followedUserIdDic.Add(followerUserId, sameFollowedUserIds);
}
sameFollowedUserIdList.AddRange(sameFollowedUserIds);
}
//批量查询“共同关注的用户”列表
IEnumerable <User> followerUserList = userService.GetFullUsers(followerUserIds).Where(n => n.IsCanbeFollow == true && n.IsActivated == true && n.IsBanned == false);
//组装分页对象
PagingDataSet <User> users = new PagingDataSet <User>(followerUserList)
{
TotalRecords = searchResult.TotalRecords,
PageSize = searchResult.PageSize,
PageIndex = searchResult.PageIndex,
QueryDuration = searchResult.QueryDuration
};
//批量查询“共同关注的用户”关注的“共同关注用户”列表
IEnumerable <User> sameFollowedUserList = userService.GetFullUsers(sameFollowedUserIdList.Distinct());
followedUserDic = sameFollowedUserList.ToDictionary(n => n.UserId);
return(users);
}
/// <summary>
/// 搜索“使用了相同标签”的用户
/// </summary>
/// <param name="userId">当前用户的ID（浏览者）</param>
/// <param name="pageIndex">分页页码</param>
/// <param name="pageSize">分页大小</param>
/// <param name="tagNameDic">存储用户ID到标签列表的映射，用于页面列表输出</param>
/// <returns></returns>
public PagingDataSet <User> SearchInterestedWithTags(long userId, int pageIndex, int pageSize, out Dictionary <long, IEnumerable <string> > tagNameDic)
{
//Dictionary，用于页面列表输出
tagNameDic = new Dictionary <long, IEnumerable <string> >();
//无效用户ID，直接返回空列表
if (userId <= 0)
{
return(new PagingDataSet <User>(new List <User>()));
}
Query query = null;
Filter filter = null;
Sort sort = null;
//先搜索出当前用户的标签
//使用LuceneSearchBuilder构建Lucene需要Query、Filter、Sort
LuceneSearchBuilder searchBuilder = new LuceneSearchBuilder();
searchBuilder.WithField(UserIndexDocument.UserId, userId.ToString(), true);
searchBuilder.BuildQuery(out query, out filter, out sort);
IEnumerable <Document> docs = searchEngine.Search(query, filter, sort, 1);
//索引中无此用户，直接返回空列表
if (docs == null || docs.Count <Document>() == 0)
{
return(new PagingDataSet <User>(new List <User>()));
}
string[] myTagNames = docs.First <Document>().GetValues(UserIndexDocument.TagName);
//当前用户无标签，直接返回空列表
if (myTagNames != null && myTagNames.Count() == 0)
{
return(new PagingDataSet <User>(new List <User>()));
}
//查找有相同标签的用户
//先查询当前用户关注的人(包括“悄悄关注”的用户)，此处需要调用数据库查询，因为索引中没有存储“是否悄悄关注”属性
IEnumerable <long> myFollowedUserIds = followService.GetPortionFollowedUserIds(userId);
//黑名单用户
IEnumerable <long> stopUserIds = new PrivacyService().GetStopedUsers(userId).Select(n => n.Key);
//使用LuceneSearchBuilder构建Lucene需要Query、Filter、Sort
searchBuilder = new LuceneSearchBuilder(0);
//搜索条件需要排除掉当前用户本身
searchBuilder.WithPhrases(UserIndexDocument.TagName, myTagNames.ToList <string>())
.NotWithField(UserIndexDocument.UserId, userId.ToString()) //排除掉当前用户
.NotWithFields(UserIndexDocument.UserId, myFollowedUserIds.Select(n => n.ToString())) //排除掉已关注用户
.NotWithFields(UserIndexDocument.UserId, stopUserIds.Select(n => n.ToString())); //排除掉黑名单用户
searchBuilder.BuildQuery(out query, out filter, out sort);
PagingDataSet <Document> searchResult = searchEngine.Search(query, filter, sort, pageIndex, pageSize);
docs = searchResult.ToList <Document>();
//如果没有使用相同标签的用户，直接返回空列表
if (docs == null || docs.Count <Document>() == 0)
{
return(new PagingDataSet <User>(new List <User>()));
}
//“使用了相同标签”的用户ID列表
List <long> sameUserIds = new List <long>();
foreach (Document doc in docs)
{
long sameUserId = long.Parse(doc.Get(UserIndexDocument.UserId));
sameUserIds.Add(sameUserId);
string[] tagNames = doc.GetValues(UserIndexDocument.TagName);
//比较获取“相同的标签”
IEnumerable <string> sameTagNames = myTagNames.Intersect <string>(tagNames);
//加入Dictionary，用于页面列表输出
if (!tagNameDic.ContainsKey(sameUserId))
{
tagNameDic.Add(sameUserId, sameTagNames);
}
}
//批量查询“使用了相同标签”的用户列表
IEnumerable <User> sameUsers = userService.GetFullUsers(sameUserIds).Where(n => n.IsCanbeFollow == true && n.IsActivated == true && n.IsBanned == false);
//组装分页对象
PagingDataSet <User> users = new PagingDataSet <User>(sameUsers)
{
TotalRecords = searchResult.TotalRecords,
PageSize = searchResult.PageSize,
PageIndex = searchResult.PageIndex,
QueryDuration = searchResult.QueryDuration
};
return(users);
}