public static async Task <(bool Success, string LockValue)> LockAsync(this IDatabase redisDb, string cacheKey, int timeoutSeconds = 5, bool autoDelay = true)
{
ArgumentCheck.NotNullOrWhiteSpace(cacheKey, nameof(cacheKey));
ArgumentCheck.NotLessThanOrEqualZero(timeoutSeconds, nameof(timeoutSeconds));
var lockKey = GetLockKey(cacheKey);
var lockValue = Guid.NewGuid().ToString();
var timeoutMilliseconds = timeoutSeconds * 1000;
var expiration = TimeSpan.FromMilliseconds(timeoutMilliseconds);
bool flag = await redisDb.StringSetAsync(lockKey, lockValue, expiration, When.NotExists);
if (flag && autoDelay)
{
var refreshMilliseconds = (int)(timeoutMilliseconds / 2.0);
var autoDelayTimer = new Timer(timerState => Delay(redisDb, lockKey, lockValue, timeoutMilliseconds), null, refreshMilliseconds, refreshMilliseconds);
var addResult = AutoDelayTimers.Instance.TryAdd(lockKey, autoDelayTimer);
if (!addResult)
{
autoDelayTimer?.Dispose();
await redisDb.SafedUnLockAsync(lockKey, lockValue);
return(false, null);
}
}
return(flag, flag ? lockValue : null);
}
