public void onGroupLifecycle(final String group, final LifecycleOperation op)
{
ServerGroup serverGroup = serverGroups.get(group);
if (serverGroup != null)
{
ServerGroupLifecycleCallback lifecycleCallback = new ServerGroupLifecycleCallback(hostInfoStore,
serverGroup.serversPerHost, op, new SimpleCallback<List<Server>>()
{
@Override
public void onSuccess(final List<Server> result)
{