2 -behaviour(gen_server).
20 -define(INTERVAL, 100). % In milliseconds
22 -define(CHAR_DEAD, 32). % Space
23 -define(CHAR_ALIVE, 111). % o
24 -define(CHAR_BAR, 45). % -
27 -record(state, {x :: integer()
29 ,cells :: list(atom())
30 ,num_cells :: integer()
31 ,state_pairs :: list(tuple(integer(), integer())) | []
32 ,replies_pending :: integer()
37 %% ============================================================================
39 %% ============================================================================
41 start_link(X, Y, Cells) ->
42 ServerName = {local, ?MODULE},
45 gen_server:start_link(ServerName, ?MODULE, Args, Opts).
48 report_state(CellID, CellState) ->
49 gen_server:cast(?MODULE, {report_state, {CellID, CellState}}).
52 %% ============================================================================
54 %% ============================================================================
56 init([X, Y, Cells]) ->
60 ,num_cells = length(Cells)
69 terminate(_Reason, State) ->
73 code_change(_Old, State, _Other) ->
77 handle_call(_Msg, _From, State) ->
89 ok = cast_all(Cells, {next_gen, NewGenID}),
90 {noreply, State#state{replies_pending=NumCells, gen_id=NewGenID}};
92 handle_cast({report_state, {ID, CellState}},
95 ,state_pairs=StatePairs
96 ,replies_pending=RepliesPending
101 NewStatePairs = [{ID, CellState} | StatePairs],
102 NewRepliesPending = RepliesPending - 1,
103 NewState = State#state{replies_pending=NewRepliesPending},
105 case NewRepliesPending of
107 SortedStatePairs = lists:sort(
108 fun({A, _}, {B, _}) -> A < B end,
111 StateChars = [state_to_char(S) || {_, S} <- SortedStatePairs],
114 "X: ~b Y: ~b CELLS: ~b GENERATION: ~b~n",
115 [X, Y, NumCells, GenID]
117 ok = do_print_bar(X),
119 ok = do_print_state_chars(X, StateChars),
121 ok = timer:sleep(?INTERVAL),
123 {noreply, NewState#state{state_pairs=[]}};
126 {noreply, NewState#state{state_pairs=NewStatePairs}}
129 handle_cast(_Msg, State) ->
133 handle_info(_Msg, State) ->
137 %% ============================================================================
139 %% ============================================================================
141 schedule_next_gen() ->
142 gen_server:cast(?MODULE, next_gen).
145 cast_all([], _) -> ok;
146 cast_all([Server | Servers], Msg) ->
147 ok = gen_server:cast(Server, Msg),
148 cast_all(Servers, Msg).
151 state_to_char(0) -> ?CHAR_DEAD;
152 state_to_char(1) -> ?CHAR_ALIVE.
155 do_print_state_chars(_, []) -> ok;
156 do_print_state_chars(X, Chars) ->
157 {XChars, RestChars} = lists:split(X, Chars),
158 ok = io:format([XChars, $\n]),
159 do_print_state_chars(X, RestChars).
163 io:format("~s~n", [[?CHAR_BAR || _ <- lists:seq(1, X - 1)]]).