content: package com.sky.controller.user;
  
  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.beans.factory.annotation.Autowired;
  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.RestController;
  import java.util.List;
  
  @RestController("userDishController")
  @RequestMapping("/user/dish")
  @Slf4j
  @Api(tags = "C端-菜品浏览接口")
  public class DishController {
      @Autowired
      private DishService dishService;
  
      @Autowired
      private RedisTemplate<String, Object> redisTemplate;
  
      /**
       * 根据分类id查询菜品
       *
       * @param categoryId
       * @return
       */
      @GetMapping("/list")
      @SuppressWarnings("unchecked")
      public Result<List<DishVO>> list(Long categoryId) {
          //构造redis中是否存在菜品数据
          String cacheKey = "dish_" + categoryId;
          List<DishVO> list = (List<DishVO>) redisTemplate.opsForValue().get(cacheKey);
          if (list != null && list.size() > 0) {
              //如果存在，直接返回，无须查询数据库
              return Result.success(list);
          }
  
          Dish dish = new Dish();
          dish.setCategoryId(categoryId);
          dish.setStatus(StatusConstant.ENABLE);// 查询起售中的菜品
          list = dishService.listWithFlavor(dish);
          // 如果不存在，查询数据库，将查询到的数据放入redis中
          redisTemplate.opsForValue().set(cacheKey, list);
  
          return Result.success(list);
      }
  
  }
  