2 -behaviour(gen_server).
20 -define(INTERVAL, 0). % In milliseconds
22 -define(CHAR_DEAD, 32). % Space
23 -define(CHAR_ALIVE, 111). % o
24 -define(CHAR_BAR, 61). % =
27 -record(state, {x :: integer()
28 ,cells :: list(atom())
29 ,num_cells :: integer()
30 ,state_pairs :: list(tuple(integer(), integer())) | []
31 ,replies_pending :: integer()
32 ,gen_count = 0 :: integer()
36 %% ============================================================================
38 %% ============================================================================
40 start_link(X, Cells) ->
41 ServerName = {local, ?MODULE},
44 gen_server:start_link(ServerName, ?MODULE, Args, Opts).
48 gen_server:cast(?MODULE, Msg).
51 %% ============================================================================
53 %% ============================================================================
58 ,num_cells=length(Cells)
66 terminate(_Reason, State) ->
70 code_change(_Old, State, _Other) ->
74 handle_call(_Msg, _From, State) ->
78 handle_cast(next_tick, #state{cells=Cells, num_cells=NumCells, state_pairs=[]}=State) ->
79 ok = send_all(Cells, tick),
80 {noreply, State#state{replies_pending=NumCells}};
82 handle_cast({tock, {ID, CellState}},
84 ,state_pairs=StatePairs
85 ,replies_pending=RepliesPending
89 NewStatePairs = [{ID, CellState} | StatePairs],
90 NewRepliesPending = RepliesPending - 1,
91 NewState = State#state{replies_pending=NewRepliesPending},
93 case NewRepliesPending of
95 NewGenCount = GenCount + 1,
96 SortedStatePairs = lists:sort(NewStatePairs),
97 StateChars = [state_to_char(S) || {_, S} <- SortedStatePairs],
99 ok = io:format("GENERATIONS: ~b~n", [NewGenCount]),
100 ok = do_print_bar(X),
101 ok = do_print_state_chars(X, StateChars),
102 ok = do_print_bar(X),
103 ok = timer:sleep(?INTERVAL),
105 {noreply, NewState#state{state_pairs=[], gen_count=NewGenCount}};
108 {noreply, NewState#state{state_pairs=NewStatePairs}}
111 handle_cast(_Msg, State) ->
115 handle_info(_Msg, State) ->
119 %% ============================================================================
121 %% ============================================================================
123 send_all([], _) -> ok;
124 send_all([PID | PIDs], Msg) ->
129 state_to_char(0) -> ?CHAR_DEAD;
130 state_to_char(1) -> ?CHAR_ALIVE.
133 do_print_state_chars(_, []) -> ok;
134 do_print_state_chars(X, Chars) ->
135 {XChars, RestChars} = lists:split(X, Chars),
136 ok = io:format([XChars, $\n]),
137 do_print_state_chars(X, RestChars).
141 io:format("~s~n", [[?CHAR_BAR || _ <- lists:seq(1, X - 1)]]).