+++ /dev/null
--module(life_time).
--behaviour(gen_server).
-
-
-%% API
--export([start_link/2
- ,tock/2
- ]).
-
-%% Callbacks
--export([init/1
- ,handle_call/3
- ,handle_cast/2
- ,handle_info/2
- ,terminate/2
- ,code_change/3
- ]).
-
-
--define(INTERVAL, 0). % In milliseconds
-
--define(CHAR_DEAD, 32). % Space
--define(CHAR_ALIVE, 111). % o
--define(CHAR_BAR, 61). % =
-
-
--record(state, {x :: integer()
- ,cells :: list(atom())
- ,num_cells :: integer()
- ,state_pairs :: list(tuple(integer(), integer())) | []
- ,replies_pending :: integer()
- ,gen_count = 0 :: integer()
- }).
-
-
-%% ============================================================================
-%% API
-%% ============================================================================
-
-start_link(X, Cells) ->
- ServerName = {local, ?MODULE},
- Args = [X, Cells],
- Opts = [],
- gen_server:start_link(ServerName, ?MODULE, Args, Opts).
-
-
-tock(CellID, CellState) ->
- gen_server:cast(?MODULE, {tock, {CellID, CellState}}).
-
-
-%% ============================================================================
-%% Callbacks
-%% ============================================================================
-
-init([X, Cells]) ->
- State = #state{x=X
- ,cells=Cells
- ,num_cells=length(Cells)
- ,state_pairs=[]
- ,replies_pending=0
- },
- schedule_next_tick(),
- {ok, State}.
-
-
-terminate(_Reason, State) ->
- {ok, State}.
-
-
-code_change(_Old, State, _Other) ->
- {ok, State}.
-
-
-handle_call(_Msg, _From, State) ->
- {reply, ok, State}.
-
-
-handle_cast(next_tick,
- #state{cells=Cells
- ,num_cells=NumCells
- ,state_pairs=[]
- }=State) ->
-
- ok = cast_all(Cells, tick),
- {noreply, State#state{replies_pending=NumCells}};
-
-handle_cast({tock, {ID, CellState}},
- #state{x=X
- ,state_pairs=StatePairs
- ,replies_pending=RepliesPending
- ,gen_count=GenCount
- ,num_cells=NumCells
- }=State) ->
-
- NewStatePairs = [{ID, CellState} | StatePairs],
- NewRepliesPending = RepliesPending - 1,
- NewState = State#state{replies_pending=NewRepliesPending},
-
- case NewRepliesPending of
- 0 ->
- NewGenCount = GenCount + 1,
- SortedStatePairs = lists:sort(NewStatePairs),
- StateChars = [state_to_char(S) || {_, S} <- SortedStatePairs],
- ok = do_print_bar(X),
- ok = io:format(
- "CELLS: ~b GENERATIONS: ~b~n",
- [NumCells, NewGenCount]
- ),
- ok = do_print_bar(X),
- ok = do_print_state_chars(X, StateChars),
- ok = do_print_bar(X),
- ok = timer:sleep(?INTERVAL),
- schedule_next_tick(),
- {noreply, NewState#state{state_pairs=[], gen_count=NewGenCount}};
-
- _N ->
- {noreply, NewState#state{state_pairs=NewStatePairs}}
- end;
-
-handle_cast(_Msg, State) ->
- {noreply, State}.
-
-
-handle_info(_Msg, State) ->
- {noreply, State}.
-
-
-%% ============================================================================
-%% Internal
-%% ============================================================================
-
-schedule_next_tick() ->
- gen_server:cast(?MODULE, next_tick).
-
-
-cast_all([], _) -> ok;
-cast_all([Server | Servers], Msg) ->
- ok = gen_server:cast(Server, Msg),
- cast_all(Servers, Msg).
-
-
-state_to_char(0) -> ?CHAR_DEAD;
-state_to_char(1) -> ?CHAR_ALIVE.
-
-
-do_print_state_chars(_, []) -> ok;
-do_print_state_chars(X, Chars) ->
- {XChars, RestChars} = lists:split(X, Chars),
- ok = io:format([XChars, $\n]),
- do_print_state_chars(X, RestChars).
-
-
-do_print_bar(X) ->
- io:format("~s~n", [[?CHAR_BAR || _ <- lists:seq(1, X - 1)]]).