业务场景:
比如:给某条记录点赞时, 有两个条件:(1)本条记录有点赞限制 (2) 点赞人有点赞限制。
问题: 并发时,需要加锁, 而且需要同时加两把锁。
工具类:
@Service public class RedissonService{ @Autowired private RedissonClient redissonClient; public RedissonClient getRedissonClient() throws IOException { return redissonClient; }
/** * 获取锁 */ public RLock getRLock(String objectName) { return redissonClient.getLock(objectName); } /** * @desc : 同时加多个锁 **/ public RLock getMultiLock(RLock... locks){ return redissonClient.getMultiLock(locks); } } 业务逻辑:
// 加锁1 RLock lock1 = redissonService.getRLock("xxx1"); // 加锁2 RLock lock2 = redissonService.getRLock("xxx2"); RLock multiLock = redissonService.getMultiLock(lock1, lock2); try { boolean bs = multiLock.tryLock(2, 3, TimeUnit.SECONDS); if (!bs) { log.info("没有获取到分布式锁"); ApiResult.fail("并发错误,请重试"); } // 业务逻辑
}catch (Exception ex){ log.error("异常,{}", ex); return ApiResult.fail("请求异常"); }finally { if(multiLock.isHeldByCurrentThread()) { multiLock.unlock(); } } } 参考:https://www.modb.pro/db/193555 https://baijiahao.baidu.com/s?id=1736377262695968742&wfr=spider&for=pc