anchor.diff:  %%--------------------------------------------------------------------
   init([]) ->
       ets:new(?TABLE, [public, named_table, {read_concurrency, true}]),
  -    vmq_plugin_mgr:enable_module_plugin(?MODULE, change_config, 0),
  +    vmq_plugin_mgr:enable_module_plugin(?MODULE, change_config, 1),
       {ok, []}.
   
   %%--------------------------------------------------------------------
  
positive.code: 
  
  %%% VMQ_SERVER CONFIG HOOK
  change_config() ->
      Env = filter_out_unchanged(get_all_env(vmq_server), []),
      %% change session configurations
      case lists:keyfind(vmq_session, 1, validate_session_config(Env, [])) of
          {_, SessionConfigs} ->
  
negative.code: 
  %% API
  -export([start_link/0,
           change_config/1,
           configure_node/0,
           table_defs/0,
           reset/0,
  