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);
}
/// <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);
}
public Task StopAsync(CancellationToken cancellationToken = default(CancellationToken))
{
if (_client != null && !cancellationToken.IsCancellationRequested)
{
_client.UnSubscribeDataChange(ListenerPath, (ct, args) => { return(Task.CompletedTask); });
}
return(Task.CompletedTask);
}
