anchor.diff:  %% List ccm nodes to be used by node manager.
   %% @end
   %%--------------------------------------------------------------------
  --spec ccm_nodes() -> Nodes :: [atom()].
  +-spec ccm_nodes() -> {ok, Nodes :: [atom()]} | undefined.
   ccm_nodes() ->
     application:get_env(?APP_NAME, ccm_nodes).
   
  
positive.code: 
  handle_cast_extension(_Request, State) ->
    ?log_bad_request(_Request),
    {reply, wrong_request, State}.
  
  %%--------------------------------------------------------------------
  %% @private
  
negative.code: %% List db nodes to be used by node manager.
  %% @end
  %%--------------------------------------------------------------------
  -spec db_nodes() -> {ok, Nodes :: [atom()]} | undefined.
  db_nodes() ->
    application:get_env(?APP_NAME, db_nodes).
  
  