private async Task OnChildrenChangeHandle(WatchedEvent watchedEvent)
{
if (!HasChildrenChangeHandler)
{
return;
}
//获取当前节点最新的子节点信息
var getCurrentChildrens = new Func <Task <Dictionary <string, DataResult> > >(() => _client.RetryUntilConnected(
async() =>
{
try
{
return(await GetChildrenDatasAsync());
}
catch (KeeperException.NoNodeException)
{
return(null);
}
}));
//根据事件类型构建节点子节点变更事件参数
NodeChildrenChangeArgs args;
switch (watchedEvent.get_Type())
{
case Watcher.Event.EventType.NodeCreated:
args = new NodeChildrenChangeArgs(Path, Watcher.Event.EventType.NodeCreated,
await getCurrentChildrens());
break;
case Watcher.Event.EventType.NodeDeleted:
args = new NodeChildrenChangeArgs(Path, Watcher.Event.EventType.NodeDeleted, null);
break;
case Watcher.Event.EventType.NodeChildrenChanged:
case Watcher.Event.EventType.None: //重连时触发
args = new NodeChildrenChangeArgs(Path, Watcher.Event.EventType.NodeChildrenChanged,
await getCurrentChildrens());
break;
default:
throw new NotSupportedException($"不支持的事件类型：{watchedEvent.get_Type()}");
}
await _childrenChangeHandler(_client, args);
//重新监听
await WatchChildrenChange();
}
internal async Task HandleChildrenChange(IZookeeperClient client, NodeChildrenChangeArgs args)
{
Watcher.Event.EventType eventType = args.Type;
var path = args.Path;
var watcher = new ChildrenMonitorWatcher(path, _action);
switch (eventType)
{
case Watcher.Event.EventType.NodeCreated:
await client.SubscribeChildrenChange(path, watcher.HandleChildrenChange);
break;
case Watcher.Event.EventType.NodeDataChanged:
try
{
var currentChildrens = new string[0];
if (args.CurrentChildrens != null && args.CurrentChildrens.Any())
{
currentChildrens = args.CurrentChildrens.ToArray();
}
_action(_currentData, currentChildrens);
watcher.SetCurrentData(currentChildrens);
}
catch (KeeperException.NoNodeException)
{
_action(_currentData, new string[0]);
watcher.SetCurrentData(new string[0]);
}
break;
case Watcher.Event.EventType.NodeDeleted:
_action(_currentData, new string[0]);
watcher.SetCurrentData(new string[0]);
break;
}
}
