需求

1.⼩滴课堂官⽹需要⼀个视频学习榜单，每天更新⼀次
2.需要⽀持⼈⼯运营替换榜单位置

企业中流程

1.定时任务计算昨天最多⼈学习的视频
2.晚上12点到1点更新到榜单上
3.预留⼀个接⼝，⽀持⼈⼯运营

类似场景

京东：热销⼿机榜单、电脑榜单等
百度：搜索热榜
疑惑：为啥不是实时计算?
真正⾼并发下项⽬，都是预先计算好结果，然后直接返回数据，且存储结构最简单

开发接⼝

import net.xdclass.xdclassredis.model.VideoDO;
import net.xdclass.xdclassredis.util.JsonData;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.List;@RestController
@RequestMapping("api/v1/rank")
public class RankController {@Autowiredprivate RedisTemplate<String, Object> redisTemplate;private static final String DAILY_RANK_KEY = "video:rank:daily";@RequestMapping("daily_rank")public JsonData videoDailyRank(){List<VideoDO> list =  redisTemplate.opsForList().range(DAILY_RANK_KEY,0,-1);return JsonData.buildSuccess(list);}}

测试数据

import net.xdclass.xdclassredis.model.UserDO;
import net.xdclass.xdclassredis.model.VideoDO;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;import java.io.Serializable;
import java.util.UUID;
import java.util.concurrent.TimeUnit;@SpringBootTest
class XdclassRedisApplicationTests {@Autowiredprivate RedisTemplate<String, Object> redisTemplate;@Testpublic void saveRank(){String DAILY_RANK_KEY = "video:rank:daily";VideoDO video1 = new VideoDO(3,"PaaS工业级微服务大课","xdclass.net",1099);VideoDO video2 = new VideoDO(5,"AlibabaCloud全家桶实战","xdclass.net",59);VideoDO video3 = new VideoDO(53,"SpringBoot2.X+Vue3综合实战","xdclass.net",49);VideoDO video4 = new VideoDO(15,"玩转23种设计模式+最近实战","xdclass.net",49);VideoDO video5 = new VideoDO(45,"Nginx网关+LVS+KeepAlive","xdclass.net",89);redisTemplate.opsForList().leftPushAll(DAILY_RANK_KEY,video5,video4,video3,video2,video1);}}

人工运营操作榜单

import net.xdclass.xdclassredis.model.UserDO;
import net.xdclass.xdclassredis.model.VideoDO;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;import java.io.Serializable;
import java.util.UUID;
import java.util.concurrent.TimeUnit;@SpringBootTest
class XdclassRedisApplicationTests {@Autowiredprivate RedisTemplate<String, Object> redisTemplate;@Testpublic void replaceRank(){String DAILY_RANK_KEY = "video:rank:daily";VideoDO video = new VideoDO(5432,"小滴课堂面试专题第一季","xdclass.net",323);redisTemplate.opsForList().set(DAILY_RANK_KEY,1,video);}}