/// <summary>
/// 注册监控关系，并返回在注册监控之前变更过的znode完整路径对应的configName
/// </summary>
public IEnumerable <string> RegisterWatcher()
{
var configs = new HashSet <string>();
if (_builder != null)
{
long mtime = _mtime;
var znodes = _builder.GetAllZnodes();
foreach (var node in znodes)
{
var path = _builder.GetZkPath(node);
try
{
var stat = ZooKeeper.Exists(path, true);
if (stat != null)
{
if (_mtime > 0 && stat.Mtime > _mtime)
{
//通过_mtime是否大于0进行判断是第一次还是Expired后重连，只有重连时才需要返回变更过的节点
configs.Add(_builder.GetConfigName(node));
}
ZooKeeper.AddTmpChildNode(path, _clientName);
mtime = Math.Max(mtime, stat.Mtime);
}
}
catch (Exception)
{
//TODO:可能需要判断Expired
}
}
_mtime = mtime;
}
return(configs);
}
/// <summary>
/// 监控进程
/// </summary>
/// <param name="event"></param>
public override void Process(WatchedEvent @event)
{
base.Process(@event);
switch (@event.Type)
{
case EventType.NodeDataChanged:
var path = @event.Path;
if (NodeChanged != null && !string.IsNullOrWhiteSpace(path))
{
NodeChanged(_builder.GetConfigName(Path.GetFileName(path)));
try
{
//重新注册监控
//这里可能会存在Expired问题
var stat = ZooKeeper.Exists(path, true);
ZooKeeper.AddTmpChildNode(path, _clientName);
//按正常逻辑，最后更新的节点，mtime肯定比目前记录的mtime大，所以这里不进行Math.Max处理
_mtime = stat.Mtime;
}
catch (Exception)
{
//TODO:可能需要判断Expired
}
}
break;
}
}