public async Task SnapUpCommodity()
{
string guid = Guid.NewGuid().ToString(); //设置唯一key，互斥锁，只能解锁自己上的锁
var threadId = Thread.CurrentThread.ManagedThreadId.ToString(); //线程id 模拟UserID
var commoditySum = int.Parse(await _redis.StringGetAsync(commodityKey, CommandFlags.PreferSlave)); //模拟库存库存 如果库存不足，则直接返回
if (commoditySum <= 0 || _redis.HashExists(RushBuySuccessUser, threadId, CommandFlags.PreferSlave)) //根据业务，防止超抢情况，如果抢购成功则直接返回
{
return;
}
var lockResult = await _redisClient.LockTakeAsync(lockKey, guid, lockKeyOutTime); //获取锁，设置定期时间，一般为30秒，防止执行过程中服务器宕机导致死锁
if (lockResult) //如果获取成功则执行业务
{
try
{
//_redisClient.LockWatchDogStart(lockKey, guid, lockKeyOutTime);
Thread.Sleep(4000);
await SanpUpCommodity();//模拟抢购成功，减库存
}
catch (Exception ex)
{
throw ex;
}
finally
{
//_redisClient.LockWatchDogStop();
_redis.HashIncrement(RushBuySuccessUser, threadId); //如果抢购成功则存入hashkey，避免超抢
await _redisClient.LockReleaseAsync(lockKey, guid); //抢购成功则释放锁
Console.WriteLine($"用户：{threadId}已抢到商品，时间为:{DateTime.Now}");
}
}
}
