public async Task Subscribe(string serviceName, string groupName, List <string> clusters, IEventListener listener)
{
if (listener == null)
{
return;
}
string clusterString = string.Join(",", clusters);
_changeNotifier.RegisterListener(groupName, serviceName, clusterString, listener);
await _clientProxy.Subscribe(serviceName, groupName, clusterString).ConfigureAwait(false);
}
