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 {

    @Autowired
    private 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 {


	@Autowired
	private RedisTemplate<String, Object> redisTemplate;


	@Test
	public 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 {


	@Autowired
	private RedisTemplate<String, Object> redisTemplate;

	@Test
	public 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);

	}

}