anchor.diff:  			 downloaded = 0,
   			 left = 0}).
   
  +-define(SERVER, ?MODULE).
   -define(DEFAULT_REQUEST_TIMEOUT, 180).
   
  +%% API
  +start_link({Master, StatePid, Url, InfoHash, PeerId}) ->
  +    gen_server:start_link({local, ?SERVER}, ?MODULE, [{Master, StatePid, Url, InfoHash, PeerId}], []).
  +
  +request_tracker_immediately(Pid) ->
  +    gen_server:cast(Pid, tracker_request_now).
  +
  +%% Callbacks
   init({Master, StatePid, Url, InfoHash, PeerId}) ->
       {ok, {Master, StatePid, Url, InfoHash, PeerId}}.
   
  
positive.code: handle_cast(stop, State) ->
      tracker_request(State, "stopped").
  
  %% Operations
  request_tracker_immediately(Pid) ->
      gen_server:cast(Pid, tracker_request_now).
  
  %% Helpers
  build_request_to_send(StatePid) ->
      {data_transfer_amounts, Uploaded, Downloaded, Left} =
  	torrent_state:current_state(StatePid),
  
negative.code: handle_call(_Call, _Who, S) ->
      {noreply, S}.
  
  
  handle_cast(tracker_request_now, State) ->
      tracker_request(State, none);
  