sky-take-out/sky-server/src/main/java/com/sky/controller/user/DishController.java

package com.sky.controller.user;

import com.alibaba.fastjson.JSON;
import com.sky.constant.StatusConstant;
import com.sky.entity.Dish;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.util.List;
import java.util.concurrent.TimeUnit;

@RestController("userDishController")
@RequestMapping("/user/dish")
@Slf4j
@Api(tags = "C端-菜品浏览接口")
public class DishController {
    @Resource
    private DishService dishService;
    @Resource
    private RedisTemplate redisTemplate;

    /**
     * 根据分类id查询菜品
     *
     * @param categoryId Long
     * @return Result<List < DishVO>>
     */
    @GetMapping("/list")
    @ApiOperation("根据分类id查询菜品")
    public Result<List<DishVO>> list(@RequestParam Long categoryId) {
        // 设置Redis中key
        String key = "dish_" + categoryId;
        // 查询Redis中数据
        List<DishVO> list = (List<DishVO>) redisTemplate.opsForValue().get(key);
        // 如果不为空返回集合
        if (list != null && !list.isEmpty()) {
            return Result.success(list);
        }

        // 如果Redis中没有，将值放入
        Dish dish = new Dish();
        dish.setCategoryId(categoryId);
        dish.setStatus(StatusConstant.ENABLE);// 查询起售中的菜品
        // 将这个数据保存到redis中
        list = dishService.listWithFlavor(dish);
        redisTemplate.opsForValue().set(key, JSON.toJSON(list), 7, TimeUnit.DAYS);
        // 如果Redis中没有，返回这个数据并保存这个数据
        return Result.success(list);
    }

}