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()
33 ,gen_count = 0 :: integer()
37 %% ============================================================================
39 %% ============================================================================
41 start_link(X, Y, Cells) ->
42 ServerName = {local, ?MODULE},
45 gen_server:start_link(ServerName, ?MODULE, Args, Opts).
48 tock(CellID, CellState) ->
49 gen_server:cast(?MODULE, {tock, {CellID, CellState}}).
52 %% ============================================================================
54 %% ============================================================================
56 init([X, Y, Cells]) ->
60 ,num_cells=length(Cells)
68 terminate(_Reason, State) ->
72 code_change(_Old, State, _Other) ->
76 handle_call(_Msg, _From, State) ->
80 handle_cast(next_tick,
86 ok = cast_all(Cells, tick),
87 {noreply, State#state{replies_pending=NumCells}};
89 handle_cast({tock, {ID, CellState}},
92 ,state_pairs=StatePairs
93 ,replies_pending=RepliesPending
98 NewStatePairs = [{ID, CellState} | StatePairs],
99 NewRepliesPending = RepliesPending - 1,
100 NewState = State#state{replies_pending=NewRepliesPending},
102 case NewRepliesPending of
104 NewGenCount = GenCount + 1,
105 SortedStatePairs = lists:sort(
106 fun({A, _}, {B, _}) -> A < B end,
109 StateChars = [state_to_char(S) || {_, S} <- SortedStatePairs],
112 "X: ~b Y: ~b CELLS: ~b GENERATIONS: ~b~n",
113 [X, Y, NumCells, NewGenCount]
115 ok = do_print_bar(X),
117 ok = do_print_state_chars(X, StateChars),
119 ok = timer:sleep(?INTERVAL),
120 schedule_next_tick(),
121 {noreply, NewState#state{state_pairs=[], gen_count=NewGenCount}};
124 {noreply, NewState#state{state_pairs=NewStatePairs}}
127 handle_cast(_Msg, State) ->
131 handle_info(_Msg, State) ->
135 %% ============================================================================
137 %% ============================================================================
139 schedule_next_tick() ->
140 gen_server:cast(?MODULE, next_tick).
143 cast_all([], _) -> ok;
144 cast_all([Server | Servers], Msg) ->
145 ok = gen_server:cast(Server, Msg),
146 cast_all(Servers, Msg).
149 state_to_char(0) -> ?CHAR_DEAD;
150 state_to_char(1) -> ?CHAR_ALIVE.
153 do_print_state_chars(_, []) -> ok;
154 do_print_state_chars(X, Chars) ->
155 {XChars, RestChars} = lists:split(X, Chars),
156 ok = io:format([XChars, $\n]),
157 do_print_state_chars(X, RestChars).
161 io:format("~s~n", [[?CHAR_BAR || _ <- lists:seq(1, X - 1)]]).