public void UnSubscribeDataChanges(string path, IZKDataListener dataListener)
{
ConcurrentHashSet <IZKDataListener> listeners;
_dataListeners.TryGetValue(path, out listeners);
if (listeners != null)
{
listeners.Remove(dataListener);
}
if (listeners == null || listeners.IsEmpty)
{
ConcurrentHashSet <IZKDataListener> _listeners;
_dataListeners.TryRemove(path, out _listeners);
}
}
public void SubscribeDataChanges(string path, IZKDataListener listener)
{
ConcurrentHashSet <IZKDataListener> listeners;
//Monitor.Enter(_dataListener);
_dataListener.TryGetValue(path, out listeners);
if (listeners == null)
{
listeners = new ConcurrentHashSet <IZKDataListener>();
_dataListener.TryAdd(path, listeners);
}
listeners.Add(listener);
//Monitor.Exit(_dataListener);
WatchForData(path);
LOG.Debug("Subscribed data changes for " + path);
}
public void SubscribeDataChanges(string path, IZKDataListener listener)
{
ConcurrentHashSet <IZKDataListener> listeners;
_dataListeners.TryGetValue(path, out listeners);
if (listeners == null)
{
listeners = new ConcurrentHashSet <IZKDataListener>();
_dataListeners.TryAdd(path, listeners);
}
listeners.Add(listener);
Task.Run(async() =>
{
await WatchForDataAsync(path);
}).ConfigureAwait(false).GetAwaiter().GetResult();
LOG.Debug($"Subscribed data changes for {path}");
}
public ZKDistributedDelayLock(ZKClient client, string lockPach)
{
this.client = client;
this.lockPath = lockPach;
cancellationTokenSource = new CancellationTokenSource();
factory = new TaskFactory(
cancellationTokenSource.Token,
TaskCreationOptions.None,
TaskContinuationOptions.None,
new LimitedConcurrencyLevelTaskScheduler(1));
nodeListener = new ZKDataListener().DataDeleted(
(path) =>
{
factory.StartNew(() =>
{
if (!factory.CancellationToken.IsCancellationRequested)
{
if (!hasLock)
{
//如果当前没有持有锁
//为了解决网络闪断问题，先等待一段时间，再重新竞争锁
Thread.Sleep(delayTimeMillis);
//如果之前获得锁的线程解除了锁定，则所有等待的线程都重新尝试，这里使得信号量加1
semaphore.Release();
}
}
}, factory.CancellationToken);
});
stateListener = new ZKStateListener().StateChanged((state) =>
{
if (state == KeeperState.SyncConnected)
{
//如果重新连接
factory.StartNew(() =>
{
if (!factory.CancellationToken.IsCancellationRequested)
{
if (hasLock)
{
//现在持有锁
//重新创建节点
try
{
client.Create(lockPath + "/lock", lockNodeData, CreateMode.Ephemeral);
}
catch (ZKNodeExistsException e)
{
try
{
if (lockNodeData != client.ReadData <string>(lockPath + "/lock"))
{
hasLock = false;
}
}
catch (ZKNoNodeException e2)
{
//ignore
}
}
}
}
}, factory.CancellationToken);
}
});
}
