苍穹外卖-Redis缓存数据

缓存菜品

缓存实现逻辑路线如图：

使用redis缓存：

代码实现

@RestController("userDishController")
@RequestMapping("/user/dish")
@Slf4j
@Api(tags = "c用户端-菜品浏览接口")
public class DishController {
    @Autowired
    private DishService dishService;
    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 根据分类id查询菜品
     */
    @GetMapping("list")
    public Result<List<DishVO>> list(long categoryId) {
        //构造redis中的key，规则： dish_分类id
        String key = "dish_" + categoryId;

        //查询redis中是否存在菜品数据
        List<DishVO> list = (List<DishVO>) redisTemplate.opsForValue().get(key);
        if ( list!= null && list.size() > 0){
            //如果存在，直接返回
            return Result.success(list);
        }

        Dish dish = new Dish();
        dish.setCategoryId(categoryId);
        dish.setStatus(StatusConstant.ENABLE);//查询起售种的菜品
        //如果不存在，查询数据库，将查询到的数据放入redis中
        list= dishService.listWithFlavor(dish);
        redisTemplate.opsForValue().set(key,list);

        return   Result.success(list);

    }


}

更新缓存

数据库发生如下变化时，清理缓存。

代码实现：

@Slf4j
@RestController
@Api(tags = "菜品管理")
@RequestMapping("/admin/dish")
public class DishController {
    @Autowired
    private DishService dishService;
    @Autowired
    private CommonController commonController;
    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 新增菜品
     * @return
     */
    @PostMapping
    @ApiOperation(value = "新增菜品")
    public Result save(@RequestBody DishDTO dishDTO){
        log.info("新增菜品：{}", dishDTO);
        dishService.savewithflavor(dishDTO);

        //  清理缓存数据
        String key = "dish_" + dishDTO.getCategoryId();
        redisTemplate.delete(key);
        return Result.success();
    }
    /**
     * 菜品分页查询
     */
    @GetMapping("/page")
    @ApiOperation(value = "分页查询菜品")
    public Result<PageResult> page(DishPageQueryDTO dishPageQueryDTO){
        log.info("分页查询菜品：{}", dishPageQueryDTO);
        PageResult pageResult = dishService.pageQuery(dishPageQueryDTO);
        return  Result.success(pageResult);
    }

    /**
     * 批量删除菜品
     * @param ids
     * @return
     */
    @DeleteMapping
    @ApiOperation(value = "批量删除菜品")
    public Result delete(@RequestParam List<Long> ids){
        log.info("批量删除菜品：{}", ids);
        dishService.delete(ids);

        //将所有的菜品缓存数据清理掉，所有以dish开头的key
        Set keys = redisTemplate.keys("*dish_*");
        redisTemplate.delete(keys);
        return Result.success();
    }

    /**
     * 启用或禁用菜品
     * @param status
     * @param id
     * @return
     */
    @PostMapping("/status/{status}")
    @ApiOperation(value = "启用或禁用菜品")
    public Result<String> startOrStop(@PathVariable Integer status, Long id){
        dishService.startOrStop(status, id);

        //将所有的菜品缓存数据清理掉，所有以dish开头的key
        Set keys = redisTemplate.keys("*dish_*");
        redisTemplate.delete(keys);
        return Result.success();
    }


    /**
     * 根据id查询菜品
     *
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    @ApiOperation(value = "根据id查询菜品")
    public Result<DishVO> getById(@PathVariable Long id){
        log.info("根据id查询菜品：{}", id);
        DishVO dishVO = dishService.getByIdandFlavor(id);
        return Result.success(dishVO);
    }

    /**
     * 更新菜品
     * @param dishDTO
     * @return
     */
    @PutMapping
    @ApiOperation(value = "更新菜品")
    public Result update(@RequestBody DishDTO dishDTO){
        log.info("更新菜品：{}", dishDTO);
        dishService.updateWithflavor(dishDTO);

        //将所有的菜品缓存数据清理掉，所有以dish开头的key
        Set keys = redisTemplate.keys("*dish_*");
        redisTemplate.delete(keys);
        return Result.success();
    }



    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    @GetMapping("/list")
    @ApiOperation("根据分类id查询菜品")
    public Result<List<DishVO>> list(Long categoryId) {
        Dish dish = new Dish();
        dish.setCategoryId(categoryId);
        dish.setStatus(StatusConstant.ENABLE);//查询起售中的菜品

        List<DishVO> list = dishService.listWithFlavor(dish);

        return Result.success(list);
    }

    /**
     * 清理缓存数据 的统一方法
     */
    private void clearCache(String pattern) {
        Set keys = redisTemplate.keys(pattern);
        redisTemplate.delete(keys);
    }

}