/// <summary>
/// 订阅节点数据变更。
/// </summary>
/// <param name="path">节点路径。</param>
/// <param name="listener">监听者。</param>
public async Task SubscribeDataChange(string path, NodeDataChangeHandler listener)
{
path = GetZooKeeperPath(path);
var node = GetOrAddNodeEntry(path);
await node.SubscribeDataChange(listener);
}
public async Task UnSubscribeTest()
{
var path = $"/{DateTime.Now:yyyy_MM_dd_HH_mm_ss_ff}";
var count = 0;
var waitEvent = new AutoResetEvent(false);
NodeDataChangeHandler handler = (client, args) =>
{
count++;
waitEvent.Set();
return(Task.CompletedTask);
};
await _client.SubscribeDataChange(path, handler);
await _client.CreateEphemeralAsync(path, null);
waitEvent.WaitOne(10000);
Assert.Equal(1, count);
_client.UnSubscribeDataChange(path, handler);
await _client.DeleteAsync(path);
Assert.Equal(1, count);
}
public async Task SubscribeDataChange(NodeDataChangeHandler listener)
{
_dataChangeHandler += listener;
//监控数据变化
await WatchDataChange();
}
/// <summary>
/// 监听指定的节点
/// </summary>
/// <param name="node">节点名称</param>
/// <param name="callback">节点数据更改或者节点被删除时会触发该事件</param>
/// <returns>Task</returns>
public Task Listen(string node, CacheCallback <string> callback)
{
NodeDataChangeHandler handler = null;
handler = (ct, args) =>
{
//节点被删除或者节点数据改动时清理该节点对应的缓存数据
if (args.Type == Watcher.Event.EventType.NodeDataChanged || args.Type == Watcher.Event.EventType.NodeDeleted)
{
if (callback != null)
{
callback(args.Path);
}
}
return(Task.CompletedTask);
};
NodeDataChangeHandler handlerLast = null;
if (_handlerRecord.ContainsKey(node))
{
handlerLast = _handlerRecord[node];
}
if (handlerLast != null)
{
//取消侦听
_zkClient.UnSubscribeDataChange(node, handlerLast);
}
_handlerRecord[node] = handler;
Task task = _zkClient.SubscribeDataChange(node, handler);
return(task);
}
/// <summary>
/// 取消订阅节点数据变更。
/// </summary>
/// <param name="path">节点路径。</param>
/// <param name="listener">监听者。</param>
public void UnSubscribeDataChange(string path, NodeDataChangeHandler listener)
{
path = GetZooKeeperPath(path);
var node = GetOrAddNodeEntry(path);
node.UnSubscribeDataChange(listener);
}
public void UnSubscribeDataChange(NodeDataChangeHandler listener)
{
_dataChangeHandler -= listener;
}
/// <summary>
/// 订阅节点数据变更
/// </summary>
/// <param name="path">节点路径</param>
/// <param name="listener">监听者</param>
public void SubscribeDataChange(string path, NodeDataChangeHandler listener)
{
client.SubscribeDataChange(path, listener);
}
