private async Task <bool> IfLockDeadAsync(string key, TimeSpan expireTime)
{
RedisValue redisValue = await this.database.StringGetAsync(key);
if (!redisValue.HasValue)
{
return(false);
}
LockObject lockObject = redisValue.ToString().FromJson <LockObject>();
return(lockObject.CreateTime.Add(-expireTime) > DateTime.UtcNow);
}
private async Task <bool> SetLockAsync(string key, LockObject redisValue, TimeSpan expireTime)
{
bool succeeded;
try
{
succeeded = await this.database.StringSetAsync(key, redisValue.ToJson(), expireTime, When.NotExists);
}
catch (Exception)
{
succeeded = false;
}
return(succeeded);
}
/// <summary>
/// 锁操作
/// </summary>
/// <param name="redisKey">Redis键</param>
/// <param name="expireTime">过期时间，增强对超时操作的可操作性</param>
/// <returns>System.Threading.Tasks.Task<System.Tuple<System.Boolean, Jinyinmao.OperativeCenter.Lib.RedisLock.LockObject>>.</returns>
public async Task <Tuple <bool, LockObject> > LockAsync(RedisKey redisKey, TimeSpan expireTime)
{
int i = 0;
while (true)
{
LockObject lockObject = null;
try
{
lockObject = new LockObject(redisKey, DateTime.Now.ToString(CultureInfo.InvariantCulture), DateTime.UtcNow);
if (!await this.SetLockAsync(redisKey, lockObject, expireTime))
{
await Task.Delay(this.retryEveryMilliseconds);
if (await this.IfLockDeadAsync(redisKey, expireTime))
{
await this.ReleaseLockAsync(redisKey);
}
if (i > this.maxRetryCount)
{
await this.ReleaseLockAsync(redisKey);
return(Tuple.Create(true, lockObject));
}
i++;
continue;
}
}
catch (Exception)
{
await this.ReleaseLockAsync(redisKey);
return(Tuple.Create(false, lockObject));
}
return(Tuple.Create(true, lockObject));
}
}
/// <summary>
/// 锁操作,无自定义超时操作,直到功能运行结束
/// </summary>
/// <param name="redisKey">The redis key.</param>
/// <param name="action">The action.</param>
/// <returns>Task<Tuple<System.Boolean, LockObject>>.</returns>
public async Task <Tuple <bool, LockObject> > LockUntilCompleteAsync(RedisKey redisKey, Task <Action> action)
{
LockObject lockObject = null;
try
{
lockObject = new LockObject(redisKey, DateTime.Now.ToString(CultureInfo.InvariantCulture), DateTime.UtcNow);
if (await this.SetLockAsync(redisKey, lockObject, TimeSpan.FromHours(5)))
{
await action;
await this.ReleaseLockAsync(redisKey);
}
}
catch (Exception)
{
await this.ReleaseLockAsync(redisKey);
return(Tuple.Create(false, lockObject));
}
return(Tuple.Create(true, lockObject));
}