anchor.diff:  -record(state, {
     max_backends,             % maximum number of backends on this host
     available_ports,          % available ports on this node
  +  app_pids,                 % pids that are running the apps
     current_backends  = []    % backends hosted on this app_handler
   }).
   -define(SERVER, ?MODULE).
  
positive.code: %%                                       {stop, Reason, State}
  %% Description: Handling all non call/cast messages
  %%--------------------------------------------------------------------
  handle_info(Info, State) ->
    ?LOG(info, "~p caught info: ~p", [?MODULE, Info]),
    {noreply, State}.
  
negative.code:   
    {ok, #state{
      max_backends = MaxBackends,
      app_pids        = [],
      available_ports = AvailablePorts
    }}.
  
  