gamecenter-xoa-旧版结构-stable

gamecenter-xoa-旧版结构-stable
1、renren-wap-fuxi-service-def
model和service（接口） 接口的粒度以实际业务为接口
不以单独的dao为接口，如userplay相关的业务为统一接口
如：

/**
 * $Id: IUserPlayService.java 43455 2011-07-27 12:30:44Z [email protected] $
 * Copyright 2009-2010 Oak Pacific Interactive. All rights reserved.
 */
package com.xiaonei.wap.fuxi.service;

import java.util.List;

import com.xiaonei.wap.fuxi.model.AppPageResult;
import com.xiaonei.wap.fuxi.model.UserPlayFlowResult;

//--------------------- Change Logs----------------------
// <p>@author wangqiao Initial Created at 2011-7-26<p>
//好友在玩相关接口初始化
//-------------------------------------------------------
public interface IUserPlayService {

    /**
     * 分页 取我的pageId list,包含总数
     * 
     * @param userId
     * @param pageNum
     * @param pageSize
     * @return
     */
    AppPageResult getMyPlayPageList(int userId, int pageNum, int pageSize);

    /**
     * 取好友玩过的page列表，带总数 从库中取时根据过期天数expiredDays进行过滤，负数-1不过滤，os=-1不过滤
     * 
     * @param userId
     * @param os
     * @param expiredDays
     * @param pageNum
     * @param pageSize
     * @return
     */
    AppPageResult getFriendPlayPageList(int userId, int os, int expiredDays, int pageNum,
            int pageSize);

    /**
     * 获取某apppage的好友
     * 
     * @param userId
     * @param pageId
     * @param expiredDays
     * @return
     */
    List<Integer> getFriendPlayByPageId(int userId, int pageId, int expiredDays);

    /**
     * 批量获取apppage的好友
     * 
     * @param userId
     * @param pageIds
     * @param expiredDays
     * @return
     */
    List<UserPlayFlowResult> getFriendPlayByPageIds(int userId, List<Integer> pageIds,
            int expiredDays);

}

2、renren-wap-fuxi-service-impl
DAO及impl、util
DAO多使用in函数实现对多条记录的查询，不过使用in则建立的mysql索引不起作用，sql只有在==时 索引才会起作用
如：

/**
 * $Id$
 * Copyright 2009-2010 Oak Pacific Interactive. All rights reserved.
 */
package com.xiaonei.wap.fuxi.service.impl;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.MapUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.Assert;

import com.xiaonei.wap.fuxi.dao.IUserPlayFlowDAO;
import com.xiaonei.wap.fuxi.model.AppPage;
import com.xiaonei.wap.fuxi.model.AppPageResult;
import com.xiaonei.wap.fuxi.model.UserPlayFlowResult;
import com.xiaonei.wap.fuxi.service.IUserPlayService;
import com.xiaonei.wap.fuxi.util.ComparatorAppPage;

//--------------------- Change Logs----------------------
//<p>@author zhanghua Initial Created at 2011-7-26<p>
//好友玩过的app增加os过滤条件，os=-1不过滤
//拆分接口
//-------------------------------------------------------
public class UserPlayServiceImpl extends BaseBusinessService implements IUserPlayService,
        InitializingBean {

    /**
     * Logger for this class
     */
    private static final Log logger = LogFactory.getLog(UserPlayServiceImpl.class);

    private IUserPlayFlowDAO userPlayFlowDAO;

    @Override
    public AppPageResult getMyPlayPageList(int userId, int pageNum, int pageSize) {
        if (pageNum <= 0 || userId <= 0 || pageSize <= 0) {
            return null;
        }
        List<AppPage> pageList = null;
        // 取我玩过的page id
        List<Integer> pageIdList = getMyPlayPageIds(userId);
        if (CollectionUtils.isNotEmpty(pageIdList)) {
            // TODO 如果需要带好友玩过的信息，请用getPagesWithFriendPlay方法
            pageList = getAppPagesByPageIds(pageIdList);
        }
        //封装返回值
        AppPageResult appPageResult = new AppPageResult();
        appPageResult.setCount(pageList == null ? 0 : pageList.size());
        //分页
        pageList = page(pageList, pageNum, pageSize);
        appPageResult.setAppPageList(pageList);
        return appPageResult;
    }

    @Override
    public AppPageResult getFriendPlayPageList(int userId, int os, int expiredDays, int pageNum,
            int pageSize) {
        if (userId <= 0 || pageNum <= 0 || pageSize <= 0) {
            return null;
        }
        //取所有好友玩过的信息
        Map<String, List<Integer>> playedMap = getFriendPlayMap(userId, expiredDays);
        if (logger.isDebugEnabled()) {
            logger.debug("playedMap size: " + playedMap.size());
        }
        if (MapUtils.isEmpty(playedMap)) {
            return null;
        }
        //进一步组装
        List<AppPage> resultList = wrapAppPageList(playedMap);
        if (logger.isDebugEnabled()) {
            if (resultList != null) logger.debug("resultList size: " + resultList.size());
        }
        //根据os过滤
        if (os >= 0) {
            filterByOs(resultList, os);
        }
        if (CollectionUtils.isEmpty(resultList)) {
            return null;
        }
        if (logger.isDebugEnabled()) {
            if (resultList != null) logger.debug("os filter resultList size: " + resultList.size());
        }
        //按玩过的人数从多到少排序
        sort(resultList, new ComparatorAppPage());
        //封装返回值
        AppPageResult appPageResult = new AppPageResult();
        appPageResult.setCount(resultList == null ? 0 : resultList.size());
        //分页
        resultList = page(resultList, pageNum, pageSize);
        appPageResult.setAppPageList(resultList);
        return appPageResult;
    }

    @Override
    public List<Integer> getFriendPlayByPageId(int userId, int pageId, int expiredDays) {
        //取好友玩过的信息
        Map<String, List<Integer>> playedMap = getFriendPlayMap(userId, expiredDays);
        if (MapUtils.isEmpty(playedMap)) {
            return null;
        }
        if(CollectionUtils.isNotEmpty(playedMap.get(pageId+""))){
            return playedMap.get(pageId+"");
        }
        return null;
    }

    @Override
    public List<UserPlayFlowResult> getFriendPlayByPageIds(int userId, List<Integer> pageIds,
            int expiredDays) {
        UserPlayFlowResult userPlayFlowResult;
        List<UserPlayFlowResult> resultList = new ArrayList<UserPlayFlowResult>();
        //取好友玩过的信息
        Map<String, List<Integer>> playedMap = getFriendPlayMap(userId, expiredDays);
        if (MapUtils.isEmpty(playedMap)) {
            return null;
        }
        for(int pageId : pageIds){
            if(CollectionUtils.isNotEmpty(playedMap.get(pageId+""))){
                userPlayFlowResult = new UserPlayFlowResult();
                userPlayFlowResult.setPageId(pageId);
                userPlayFlowResult.setFriends(playedMap.get(pageId+""));
                resultList.add(userPlayFlowResult);
            }
        }
        return resultList;
    }

    @Override
    public void afterPropertiesSet() throws Exception {
        Assert.notNull(userPlayFlowDAO, "appCategoryDAO is required!");
        Assert.notNull(friendsFacade, "friendsFacade is required!");
        Assert.notNull(userLastPlayFlowDAO, "userLastPlayFlowDAO is required!");
    }

    @Autowired
    public void setUserPlayFlowDAO(IUserPlayFlowDAO userPlayFlowDAO) {
        this.userPlayFlowDAO = userPlayFlowDAO;
    }


}

3、renren-wap-fuxi-xoa-client（xoa）
实现对xoa的调用，包括Delegate和XoaClientFactory（注册xoa和调用方法）
如FuxiXoaClientFactory

/**
 * $Id$
 * Copyright 2009-2010 Oak Pacific Interactive. All rights reserved.
 */
package com.xiaonei.wap.fuxi.xoa;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.apache.log4j.Logger;

import com.renren.xoa.ContentParseException;
import com.renren.xoa.Method;
import com.renren.xoa.StatusNotOkException;
import com.renren.xoa.XoaClient;
import com.renren.xoa.XoaResponse;
import com.renren.xoa.methods.XoaMethodName;
import com.renren.xoa.registry.impl.SimpleXoaRegistry;
import com.xiaonei.wap.fuxi.exception.ServiceTimeoutException;
import com.xiaonei.wap.fuxi.exception.ServiceUnableException;

/**
 * Xoa的Client工厂定义
 * 
 * 将服务器端异常直接捕获，从而不需要再使用者捕获异常。 对于无法获取到数据的接口，Object但对象返回为null 集合对象返回的是空的集合
 * 
 */
public class FuxiXoaClientFactory {

    private static final Logger logger = Logger.getLogger(FuxiXoaClientFactory.class);

    public static final String pubdate = "110513";

    private static final String SERVICE_ID = "fuxi.xoa.renren.com";

    public static final String XOA_SERVICE_URL = "xoa://" + SERVICE_ID;

    //TODO 需要修改 当前是测试ip
    private static final String SERVER_HOST = "10.3.19.200";

    //TODO 需要修改 当前是测试端口
    private static final int SERVER_PORT = 8388;

    /** 超时设置 3秒 */
    public static final int XOA_GET_TIMEOUT = 3000;

    /** 超时设置 5秒 */
    public static final int XOA_POST_TIMEOUT = 5000;

    private static XoaClient client = null;

    /**
     * 取一个可用的客户端
     * 
     * @return
     */
    public static XoaClient getXoaClient() {
        if (client != null) {
            return client;
        }
        synchronized (SERVICE_ID) {
            //此处的SERVICE_ID指出client会调用哪个服务器上的server端
            SimpleXoaRegistry reg = new SimpleXoaRegistry();
            reg.register(SERVICE_ID, SERVER_HOST, SERVER_PORT);
            //            reg.register(SERVICE_ID, "10.3.19.157", 8388);
            //            reg.register(SERVICE_ID, "10.3.18.204", 8188);
            //            reg.register(SERVICE_ID, "10.3.18.210", 8188);
            //            reg.register(SERVICE_ID, "10.3.19.189", 8188);
            //            reg.register(SERVICE_ID, "10.3.19.163", 8188);
            client = new XoaClient(reg);
        }
        return client;
    }

    /**
     * 执行无返回的方法，异常将会被直接拦截掉
     * 
     * @param method
     */
    public static void execute(Method method) {
        long startTime = System.currentTimeMillis();
        method.setParam("v", pubdate);
        try {
            getXoaClient().execute(method);
        } catch (Exception e) {
            logger.error("execute," + method.getName() + " error:", e);
        } finally {
            long used = (System.currentTimeMillis() - startTime);
            logger.info(method.getName() + "|" + method.getPath() + "|" + used);
        }
    }

    /**
     * 直接得到返回，按照默认超时时间返回结果
     * 
     * @param method
     * @return
     */
    public static XoaResponse getResponse(Method method) {
        int timeout = XOA_GET_TIMEOUT;
        if (!XoaMethodName.GET.equals(method.getName())) {
            timeout = XOA_POST_TIMEOUT;
        }
        return getResponse(method, timeout);
    }

    /**
     * 直接得到返回
     * 
     * @param method
     * @return
     */
    private static XoaResponse getResponse(Method method, int timeout) {
        long startTime = System.currentTimeMillis();
        method.setParam("v", pubdate);
        Future<XoaResponse> fs = getXoaClient().submit(method);
        try {
            return fs.get(timeout, TimeUnit.MILLISECONDS);
        } catch (ContentParseException e) {
            logger.error("XOA.getResponse ContentParseException", e);
            throw new ServiceUnableException();
        } catch (InterruptedException e) {
            logger.error("XOA.getResponse InterruptedException", e);
            throw new ServiceUnableException();
        } catch (ExecutionException e) {
            logger.error("XOA.getResponse ExecutionException", e);
            throw new ServiceUnableException();
        } catch (TimeoutException e) {
            logger.error("XOA.getResponse TimeoutException", e);
            throw new ServiceTimeoutException();
        } finally {
            long used = (System.currentTimeMillis() - startTime);
            logger.info(method.getName() + "|" + method.getPath() + "|" + used);
        }
    }

    /**
     * 直接得到转换后的结果
     * 
     * @param <T>
     * @param method
     * @param klass
     * @return
     */
    public static <T> T getContent(Method method, Class<T> klass, int timeout) {
        try {
            return getResponse(method, timeout).getContentAs(klass);
        } catch (ContentParseException e) {
            logger.error("request:" + method.getName() + "|" + method.getPath() + " error", e);
            return null;
        } catch (ServiceUnableException sue) {
            logger.error("request:" + method.getName() + "|" + method.getPath() + " error", sue);
            return null;
        } catch (ServiceTimeoutException ste) {
            logger.error("request:" + method.getName() + "|" + method.getPath() + " error", ste);
            return null;
        } catch (StatusNotOkException e) {
            logger.error("request:" + method.getName() + "|" + method.getPath() + " error", e);
            return null;
        } catch (Exception e) {
            logger.error("request:" + method.getName() + "|" + method.getPath() + " error", e);
            return null;
        }
    }

    /**
     * 直接得到转换后的结果列表
     * 
     * @param <T>
     * @param method
     * @param klass
     * @return
     * 
     */
    public static <T> List<T> getList(Method method, Class<T[]> t, int timeout) {
        T[] array = getContent(method, t, timeout);
        List<T> listEntity = new ArrayList<T>();
        if (array != null) {
            listEntity = Arrays.asList(array);
        }
        return listEntity;
    }
}

Delegate实现了接口，完成url的映射，带上相关的参数，如下：

/**
 * $Id: UserPlayServiceDelegate.java 43518 2011-07-28 04:13:08Z [email protected] $
 * Copyright 2009-2010 Oak Pacific Interactive. All rights reserved.
 */
package com.xiaonei.wap.fuxi.xoa.client;

import java.util.List;

import org.apache.commons.collections.CollectionUtils;

import com.renren.xoa.Method;
import com.xiaonei.wap.fuxi.model.AppPageResult;
import com.xiaonei.wap.fuxi.model.UserPlayFlowResult;
import com.xiaonei.wap.fuxi.service.IUserPlayService;
import com.xiaonei.wap.fuxi.xoa.FuxiXoaClientFactory;

//--------------------- Change Logs----------------------
// <p>@author anbingquan Initial Created at 2011-7-26<p>
//去掉没用的import
//-------------------------------------------------------
public class UserPlayServiceDelegate extends BaseDelegate implements IUserPlayService {

    final static String _PREFIX_FRIENDPLAYED = FuxiXoaClientFactory.XOA_SERVICE_URL + "/friendplay";

    final static String _MYPLAYLIST = _PREFIX_FRIENDPLAYED + "/myplaylist";

    final static String _LIST = _PREFIX_FRIENDPLAYED + "/list";

    final static String _FRIENDLIST = _PREFIX_FRIENDPLAYED + "/friendlist";

    final static String _FRIENDLIST_BATCH = _PREFIX_FRIENDPLAYED + "/friendlistbatch";

    @Override
    public AppPageResult getMyPlayPageList(int userId, int pageNum, int pageSize) {
        Method method = Method.get(_MYPLAYLIST);
        method.setParam("userId", String.valueOf(userId));
        method.setParam("pageNum", String.valueOf(pageNum));
        method.setParam("pageSize", String.valueOf(pageSize));
        return FuxiXoaClientFactory.getContent(method, AppPageResult.class, XOA_GET_TIMEOUT);
    }

    @Override
    public AppPageResult getFriendPlayPageList(int userId, int os, int expiredDays, int pageNum,
            int pageSize) {
        Method method = Method.get(_LIST);
        method.setParam("userId", String.valueOf(userId));
        method.setParam("os", String.valueOf(os));
        method.setParam("expiredDays", String.valueOf(expiredDays));
        method.setParam("pageNum", String.valueOf(pageNum));
        method.setParam("pageSize", String.valueOf(pageSize));
        return FuxiXoaClientFactory.getContent(method, AppPageResult.class, XOA_GET_TIMEOUT);
    }

    @Override
    public List<Integer> getFriendPlayByPageId(int userId, int pageId, int expiredDays) {
        Method method = Method.get(_FRIENDLIST);
        method.setParam("userId", String.valueOf(userId));
        method.setParam("pageId", String.valueOf(pageId));
        method.setParam("expiredDays", String.valueOf(expiredDays));
        return FuxiXoaClientFactory.getList(method, Integer[].class, XOA_GET_TIMEOUT);
    }

    @Override
    public List<UserPlayFlowResult> getFriendPlayByPageIds(int userId, List<Integer> pageIds,
            int expiredDays) {
        Method method = Method.get(_FRIENDLIST_BATCH);
        method.setParam("userId", String.valueOf(userId));
        method.setParam("expiredDays", String.valueOf(expiredDays));
        if (CollectionUtils.isNotEmpty(pageIds)) {
            for (Integer pageId : pageIds) {
                method.setParam("pageIds", String.valueOf(pageId));
            }
        }
        return FuxiXoaClientFactory.getList(method, UserPlayFlowResult[].class, XOA_GET_TIMEOUT);
    }
}

4、renren-wap-fuxi-xoa-server
通过@Get或@Post的映射关系，来调用service层内部接口中的方法

/**
 * $Id$
 * Copyright 2009-2010 Oak Pacific Interactive. All rights reserved.
 */
package com.xiaonei.wap.fuxi.controllers;

import java.util.List;

import net.paoding.rose.web.annotation.Param;
import net.paoding.rose.web.annotation.Path;
import net.paoding.rose.web.annotation.rest.Get;

import org.springframework.beans.factory.annotation.Autowired;

import com.xiaonei.wap.fuxi.model.AppPageResult;
import com.xiaonei.wap.fuxi.model.UserPlayFlowResult;
import com.xiaonei.wap.fuxi.service.IUserPlayService;

//--------------------- Change Logs----------------------
// <p>@author anbingquan Initial Created at 2011-7-26<p>
//-------------------------------------------------------

@Path("/friendplay")
public class FriendPlayController {

    @Autowired
    private IUserPlayService userPlayService;

    final static String _MYPLAYLIST = "/myplaylist";

    final static String _LIST = "/list";

    final static String _FRIENDLIST = "/friendlist";

    final static String _FRIENDLIST_BATCH = "/friendlistbatch";

    /**
     * 分页取自己玩过的page列表,带总数
     * 
     * @param userId
     * @param pageNum
     * @param pageSize
     * @return
     */
    @Get(_MYPLAYLIST)
    public AppPageResult getMyPlayPageList(@Param("userId") int userId,
            @Param("pageNum") int pageNum, @Param("pageSize") int pageSize) {

        return userPlayService.getMyPlayPageList(userId, pageNum, pageSize);
    }

    /**
     * 分页取好友玩过的page列表，根据os过滤，带总数
     * 
     * @param userId
     * @param os
     * @param expiredDays
     * @param pageNum
     * @param pageSize
     * @return
     */
    @Get(_LIST)
    public AppPageResult getFriendPlayPageList(@Param("userId") int userId, @Param("os") int os,
            @Param("expiredDays") int expiredDays, @Param("pageNum") int pageNum,
            @Param("pageSize") int pageSize) {

        return userPlayService.getFriendPlayPageList(userId, os, expiredDays, pageNum, pageSize);
    }

    /**
     * 获取某apppage的好友
     * 
     * @param userId
     * @param pageId
     * @param expiredDays
     * @return
     */
    @Get(_FRIENDLIST)
    public List<Integer> getFriendPlayByPageId(@Param("userId") int userId,
            @Param("pageId") int pageId, @Param("expiredDays") int expiredDays) {
        return userPlayService.getFriendPlayByPageId(userId, pageId, expiredDays);
    }

    /**
     * 批量获取apppage的好友
     * 
     * @param userId
     * @param pageIds
     * @param expiredDays
     * @return
     */
    @Get(_FRIENDLIST_BATCH)
    public List<UserPlayFlowResult> getFriendPlayByPageIds(@Param("userId") int userId,
            @Param("pageIds") List<Integer> pageIds, @Param("expiredDays") int expiredDays) {
        return userPlayService.getFriendPlayByPageIds(userId, pageIds, expiredDays);
    }

}

5、renren-wap-fuxi（wap层）
调用client的delegate接口，实现分布式调用接口的目的

package com.renren.wap.fuxi.controller;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.math.NumberUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.CollectionUtils;
import org.springframework.web.servlet.ModelAndView;

import com.renren.wap.fuxi.vo.AppPageVO;
import com.xiaonei.platform.core.model.WUserCache;
import com.xiaonei.platform.core.opt.ice.WUserCacheAdapter;
import com.xiaonei.wap.fuxi.model.AppPage;
import com.xiaonei.wap.fuxi.model.AppPageResult;

/**
 * @author <a href="mailto:[email protected]">安炳全</a>
 * @createTime 2011-07-15 16:00:00
 */

public class FriendPlayedingController extends BaseController {

    private static final Log logger = LogFactory.getLog(FriendPlayedingController.class);

    private final String ATTRIBUTE_METHOD = "method";
    
    private final String ATTRIBUTE_PAGEVO_LIST = "voList";

    private final String ATTRIBUTE_PAGE_CURPAGE = "curpage";

    private final String ATTRIBUTE_PAGE_SUM = "navCount";

    private final String ATTRIBUTE_PAGE_ITEMPERSIZE = "itemPerPage";

    private final int SHOW_FRIEND_COUNT = 2;

    public ModelAndView list(HttpServletRequest request, HttpServletResponse response)
            throws Exception {

        if (logger.isDebugEnabled()) {
            logger.debug("FriendPlayedingController begin......");
        }
        ModelAndView mav = new ModelAndView("/pages/wap/friendsplay");

        //int hostId = getUserId(request);
        int hostId = 1;
        if(hostId==0){
            //去登录
        }
        int os = NumberUtils.toInt(request.getParameter("os"), 0);
        int curpage = NumberUtils.toInt(request.getParameter("curpage"), 0);

        if (logger.isDebugEnabled()) {
            logger.debug("hostId ：" + hostId);
            logger.debug("os ：" + os);
            logger.debug("currentPage ：" + curpage);
            logger.debug("itemPerPage ：" + itemPerPage);
        }

        AppPageResult appPageResult = userPlayService.getFriendPlayPageList(hostId, os, EXPIRED_NO,
                curpage, itemPerPage); //调delegate
        //AppPageResult appPageResult = tempData(); 本地测试
        if (logger.isDebugEnabled()) {
            if (appPageResult != null && appPageResult.getAppPageList() != null) {
                logger.debug("appPageResult count: " + appPageResult.getCount());
            }
        }
        List<AppPageVO> voList = buildVOList(
                (appPageResult != null) ? appPageResult.getAppPageList() : new ArrayList<AppPage>(),
                (appPageResult != null) ? appPageResult.getCount() : 0);
        mav.addObject(ATTRIBUTE_PAGE_CURPAGE, curpage);
        mav.addObject(ATTRIBUTE_PAGE_SUM, (appPageResult != null) ? appPageResult.getCount() : 0);
        mav.addObject(ATTRIBUTE_PAGE_ITEMPERSIZE, itemPerPage);
        mav.addObject(ATTRIBUTE_PAGEVO_LIST, voList);
        mav.addObject(ATTRIBUTE_METHOD, "list");
        return mav;
    }

    private List<AppPageVO> buildVOList(List<AppPage> pageList, int count) {

        List<AppPageVO> voList = new ArrayList<AppPageVO>();//封装了好友在玩（名字，数量）用于页面显示
        AppPageVO vo;
        for (AppPage page : pageList) {
            vo = new AppPageVO();
            vo.setId(page.getId());
            vo.setPageName(page.getPageName());
            vo.setCompany(page.getCompany());
            vo.setIntroduction(page.getIntroduction());
            vo.setWapLogoUrl(page.getWapLogoUrl());
            vo.setShowText(getFriendNames(page));
            vo.setPlayCount(count);
            voList.add(vo);
        }

        return voList;
    }

    private String getFriendNames(AppPage page) {
        String friendNames = "";
        List<Integer> friendIds = String2List(page.getFriends());
        List<WUserCache> users;
        if (CollectionUtils.isEmpty(friendIds)) {
            return null;
        }
        if (friendIds.size() > SHOW_FRIEND_COUNT) {
            users = WUserCacheAdapter.getInstance().getUsersCacheList(
                    friendIds.subList(0, SHOW_FRIEND_COUNT));
        } else {
            users = WUserCacheAdapter.getInstance().getUsersCacheList(friendIds);
        }
        for (int i = 0; i < users.size(); i++) {
            if (i < users.size() - 1) {
                friendNames += users.get(i).getName();
            } else {
                friendNames += "," + users.get(i).getName();
            }
        }
        return friendNames;
    }
}