anchor.diff:                  cb :: 'undefined' | {Module::atom(), State::term()}
                  }).
   
  +-define(DEFAULT_MSG_CB,
  +        {logplex_worker, logplex_worker:init_state()}).
  +
   -include("logplex_logging.hrl").
   
   %%====================================================================
  
positive.code: %% gen_server callbacks
  %%====================================================================
  init([]) ->
      {ok, #state{}}.
  
  handle_call(Msg, _From, State) ->
      ?WARN("err=unexpected_call data=~p", [Msg]),
  
negative.code:                 buffer = Buffer,
                  peername = PeerName,
                  connect_time = ConnectTime,
                  cb = ?DEFAULT_MSG_CB}};
  
  code_change(v33, {state, Sock, Buffer, PeerName}, _Extra) ->
      %% Can't easily obtain a connection timestamp for an established connection.
  