anchor.diff:  
       { noreply, State#state{ query_queue = [{Ref, From, Pid}|Q] } };
   
  -handle_call( {get, queue, size}, _From, #state{query_queue = Q} = State ) ->
  +handle_call( {get, queue, size}, _From, #state{ query_queue = Q} = State ) ->
   	{reply, {ok, erlang:length( Q ) }, State};
   
  -handle_call( {get, queue, list}, _From, #state{query_queue = Q} = State ) ->
  +handle_call( {get, queue, list}, _From, #state{ query_queue = Q} = State ) ->
   	{reply, {ok, Q}, State};
   
   handle_call( {stop, Reason}, _From, State) ->
  
positive.code: 
  get_qqueue_size( Node ) ->
  	gen_server:call( Node, {get, queue, size } ).
  
  
  %% init/1
  
negative.code: 	NewState :: term(),
  	Timeout :: non_neg_integer() | infinity.
  %% ====================================================================
  handle_cast( {message, Ref, From, Msg, Options }, State ) ->
  	{noreply, State};
  
  
  handle_cast( {reply, Ref, From, Msg, Options }, State ) ->
  	{noreply, State};
  
  
  handle_cast(Msg, State) ->
      {noreply, State}.
  
  