/// <summary>
/// 同一时间只有一个客户端取到锁，取不到的直接返回
/// 需要判断lock的Locked属性
/// </summary>
/// <param name="lockId">lock key</param>
/// <returns></returns>
public async Task <IDistributeLock> GetLock(string lockId)
{
var _lock = new ZkLock(this);
if (!_zooKeeper.LockedAble)
{
return(_lock);
}
try
{
await CreateLockNodeIfNotExist(ZookeeperConst.OneLockRoot, _systemid);
_lock.Locked = false;
//判断是否已锁，如果已有，则表示本次未取到，直接返回
var lockExist = await _zooKeeper.ExistAsync($"{_oneLockRoot}/{lockId}");
if (lockExist)
{
return(_lock);
}
//尝试写入节点，如果写入成功，表示成功获取到锁
_lock.LockValue = Guid.NewGuid().ToString("N");
_lock.Id = await _zooKeeper.CreateEphemeralNode($"{_oneLockRoot}/{lockId}", _lock.LockValue);
//LastLockValue[_lock.Id] = _lock.LockValue;
_lock.Locked = true;
_zooKeeper.IncremLock();
return(_lock);
}
catch (KeeperException.NoNodeException)
{
try
{
await CreateLockNodeIfNotExist(ZookeeperConst.WaitLockRoot, _systemid);
}
catch (Exception)
{
//
}
return(_lock);
}
catch (Exception ex)
{
_log?.Error(ex);
return(_lock);
}
}
/// <summary>
/// 获取一个等待锁
/// </summary>
/// <param name="lockId"></param>
/// <returns></returns>
public async Task <IDistributeLock> GetWaitLock(string lockId)
{
var _lock = new ZkLock(this);
if (!_zooKeeper.LockedAble)
{
return(_lock);
}
try
{
_lock.Locked = false;
//尝试写入节点，如果写入成功，表示成功获取到锁
_lock.LockValue = Guid.NewGuid().ToString("N");
_lock.Id =
await
_zooKeeper.CreateEphemeralSequentialNode($"{_waitLockRoot}/{lockId}", _lock.LockValue);
var children =
await _zooKeeper.GetChildren($"{_waitLockRoot}");
children.Sort();
_lock.Locked = true;
var splitIndex = _lock.Id.LastIndexOf('/') + 1;
var index = children.IndexOf(_lock.Id.Substring(splitIndex, _lock.Id.Length - splitIndex));
//LastLockValue[_lock.Id] = _lock.LockValue;
if (index == 0)
{
_zooKeeper.IncremLock();
return(_lock);
}
SemaphoreSlim slim = new SemaphoreSlim(0);
await _zooKeeper.WatchNode($"{_waitLockRoot}/{children[index - 1]}", new NodeWatcher(slim));
await slim.WaitAsync();
_zooKeeper.IncremLock();
return(_lock);
}
catch (KeeperException.ConnectionLossException)
{
return(_lock);
}
catch (KeeperException.NoNodeException)
{
try
{
await CreateLockNodeIfNotExist(ZookeeperConst.WaitLockRoot, _systemid);
}
catch (Exception)
{
//
}
return(_lock);
}
catch (Exception ex)
{
_log?.Error(ex);
await Release(_lock);
throw;
}
}
