Redis——实现关注与取关等功能

目录

实现关注与取关

实现共同关注功能

关注推送

Feed流的模式

拉模式

推模式

推拉结合模式

总结

基于推模式实现关注推送功能

Feed流的分页问题

实现关注推送页面的分页查询

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实现关注与取关

实现

Controller层

@RestController
@RequestMapping("/follow")
public class FollowController {
    @Resource
    private IFollowService followService;
    @PutMapping("/{id}/{isFollow}")
    public Result follow(@PathVariable("id")Long followUserId,@PathVariable("isFollow") Boolean isFollow){
        return followService.follow(followUserId,isFollow);
    }

    @GetMapping("/or/not/{id}")
    public Result follow(@PathVariable("id")Long followUserId){
        return followService.isFollow(followUserId);
    }
}

 

Service层

    @Override
    public Result follow(Long followUserId, Boolean isFollow) {
        //1.获取登录用户
        UserDTO user = UserHolder.getUser();
        Long userId = user.getId();
        //判断是取关还是关注
        if(isFollow){
            //2.关注，新增数据
            Follow follow = new Follow();
            follow.setUserId(userId);
            follow.setFollowUserId(followUserId);
            follow.setCreateTime(LocalDateTime.now());
            boolean isSuccess = save(follow);
        }
        else{
            //取关，删除数据
            //sql: delete from tb_follow where user_id = ? and follow_user_id = ?
            remove(new QueryWrapper<Follow>()
                    .eq("user_id",userId)
                    .eq("follow_user_id",followUserId)
            );
        }
        return Result.ok();
    }

    @Override
    public Result isFollow(Long followUserId) {
        //1.获取用户
        UserDTO user = UserHolder.getUser();
        Long userId = user.getId();
        //查询是否关注
        //sql: select * from tb_follow where user_id = ? and follow_user_id
        Integer count = query().eq("user_id", userId).eq("follow_user_id", followUserId).count();

        return Result.ok(count>0);
    }

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实现共同关注功能

 

修改前面的关注接口，关注的对象不仅仅存入数据库中，还需存入redis中（共同关注功能需要set数据结构完成） 

修改

    @Override
    public Result follow(Long followUserId, Boolean isFollow) {
        //1.获取登录用户
        UserDTO user = UserHolder.getUser();
        Long userId = user.getId();
        String key = "follows:"+userId;
        //判断是取关还是关注
        if(isFollow){
            //2.关注，新增数据
            Follow follow = new Follow();
            follow.setUserId(userId);
            follow.setFollowUserId(followUserId);