/// <summary>
/// The Jones client constructor
/// </summary>
/// <param name="service">Service Name</param>
/// <param name="hostname">Hostname</param>
/// <param name="zkclient">Zookeeper Client connection object</param>
/// <param name="callback">Callback function for any changes to the config tree</param>
public SimpleJonesClient(string service, string hostname = null, IZookClient zkclient = null, Action <Dictionary <string, string> > callback = null)
{
// initialize the hostname
if (String.IsNullOrEmpty(hostname))
{
// get FDQN
// http://stackoverflow.com/questions/804700/how-to-find-fqdn-of-local-machine-in-c-net
// http://support.microsoft.com/kb/303902
HostName = System.Net.Dns.GetHostEntry("LocalHost").HostName.ToLower();
int idx = HostName.IndexOf(".");
if (idx > 0)
{
HostName = HostName.Substring(0, idx);
}
}
if (zkclient != null)
{
_zkclient = zkclient;
}
// initialize the dictionary to hold the configurations
Config = new Dictionary <string, string>();
// set the service name
ServiceName = service;
// this is our callback for Config View ZNode changes, to refresh our
// this.Config
ConfigViewNodeChangeWatcher = new WatcherWrapper(e =>
{
_zkclient.GetData(e.Path, ConfigViewNodeChangeWatcher).ContinueWith(d =>
{
string conf_data = Encoding.UTF8.GetString(d.Result.Data);
Config = DeserializeNodeMap(conf_data);
if (callback != null)
{
callback.Invoke(Config);
}
});
});
NodeMapPath = String.Format(@"/services/{0}/nodemaps", ServiceName);
#region get the current Config from the view
string current_conf_path = "";
var tnm = _zkclient.GetData(NodeMapPath, false).ContinueWith(c =>
{
string conf_path_json = Encoding.UTF8.GetString(c.Result.Data);
try
{
current_conf_path = DeserializeNodeMap(conf_path_json)[HostName];
}
catch (Exception)
{
// fail-safe default configs when there's no machine-specific config is found
current_conf_path = String.Format(@"/services/{0}/conf", ServiceName);
}
var td = _zkclient.GetData(current_conf_path, ConfigViewNodeChangeWatcher).ContinueWith(d =>
{
// this part is important so this.Config will not be empty on constructor completion!
string conf_data = Encoding.UTF8.GetString(d.Result.Data);
Config = DeserializeNodeMap(conf_data);
});
td.Wait(); // synchronous wait
});
tnm.Wait(); // synchronous wait
#endregion
}
