使用 Redis 查询的一般程序实现和击穿、雪崩、穿透

https://www.bilibili.com/video/BV1fb4y147qw/

package io.github.jihch.service;

import io.github.jihch.bean.ExpressInfo;
import io.github.jihch.exception.ClientException;
import io.github.jihch.mapper.ExpressMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;

import java.awt.datatransfer.Clipboard;
import java.time.Duration;

public class ExpressInfoService implements IExpressInfoService {

    @Autowired
    RedisTemplate redisTemplate;

    @Autowired
    ExpressMapper expressMapper;

    /**
     * 通过发货单查询物流信息
     * @param id
     * @return
     */
    @Override
    public ExpressInfo findByDeliveryOrderId(Long id) {
        String key = "xushu-express:express-info:";

        //从 Redis 查询物流信息
        Object obj = redisTemplate.opsForValue().get(key + id);

        if (obj != null) {
            return (ExpressInfo) obj;

        } else {
            ExpressInfo expressInfo = expressMapper.selectByDeliveryOrderId(id);
            if (expressInfo != null) {
                redisTemplate.opsForValue().set(key+id, expressInfo, Duration.ofHours(2));
                return expressInfo;
            } else {
                throw new ClientException("发货单：{} 的物流信息不存在", id);
            }
        }//end else

    }
}