%% API
--export([start_link/2
- ,tock/2
+-export([start_link/3
+ ,report_state/3
]).
%% Callbacks
]).
--define(INTERVAL, 100). % In milliseconds
+-define(GEN_INTERVAL, 100). % In milliseconds
--define(CHAR_DEAD, 32). % Space
--define(CHAR_ALIVE, 111). % o
--define(CHAR_BAR, 45). % -
+-define(CHAR_DEAD, 32). % " "
+-define(CHAR_ALIVE, 111). % "o"
+-define(CHAR_BAR, 45). % "-"
-record(state, {x :: integer()
+ ,y :: integer()
,cells :: list(atom())
,num_cells :: integer()
+ ,num_dead :: integer()
+ ,num_alive :: integer()
,state_pairs :: list(tuple(integer(), integer())) | []
,replies_pending :: integer()
- ,gen_count = 0 :: integer()
+ ,gen_id :: integer()
+ ,gen_began :: erlang:timestamp()
}).
%% API
%% ============================================================================
-start_link(X, Cells) ->
+start_link(X, Y, Cells) ->
ServerName = {local, ?MODULE},
- Args = [X, Cells],
+ Args = [X, Y, Cells],
Opts = [],
gen_server:start_link(ServerName, ?MODULE, Args, Opts).
-tock(CellID, CellState) ->
- gen_server:cast(?MODULE, {tock, {CellID, CellState}}).
+report_state(CellID, GenID, CellState) ->
+ gen_server:cast(?MODULE, {report_state, {CellID, GenID, CellState}}).
%% ============================================================================
-%% Callbacks
+%% Callbacks (unused)
%% ============================================================================
-init([X, Cells]) ->
- State = #state{x=X
- ,cells=Cells
- ,num_cells=length(Cells)
- ,state_pairs=[]
- ,replies_pending=0
- },
- schedule_next_tick(),
- {ok, State}.
-
+handle_call(_Msg, _From, State) -> {reply, ok, State}.
+code_change(_Old, State, _Other) -> {ok, State}.
+terminate(_Reason, State) -> {ok, State}.
-terminate(_Reason, State) ->
- {ok, State}.
+%% ============================================================================
+%% Callbacks
+%% ============================================================================
-code_change(_Old, State, _Other) ->
+init([X, Y, Cells]) ->
+ State = #state{x = X
+ ,y = Y
+ ,cells = Cells
+ ,num_cells = length(Cells)
+ ,state_pairs = []
+ ,replies_pending = 0
+ ,gen_id = 0
+ },
+ NextGenDelay = 0,
+ ok = schedule_next_gen(NextGenDelay),
{ok, State}.
-handle_call(_Msg, _From, State) ->
- {reply, ok, State}.
-
-
-handle_cast(next_tick,
+handle_info(next_gen,
#state{cells=Cells
,num_cells=NumCells
,state_pairs=[]
+ ,gen_id=GenID
}=State) ->
- ok = cast_all(Cells, tick),
- {noreply, State#state{replies_pending=NumCells}};
+ GenBegan = os:timestamp(),
+ NewGenID = GenID + 1,
+ ok = life_lib:cast_one2all(Cells, {next_gen, NewGenID}),
+ NewState = State#state{replies_pending=NumCells
+ ,gen_id=NewGenID
+ ,gen_began=GenBegan
+ ,num_dead=0
+ ,num_alive=0
+ },
+ {noreply, NewState};
-handle_cast({tock, {ID, CellState}},
+handle_info(_Msg, State) ->
+ {noreply, State}.
+
+
+handle_cast({report_state, {CellID, GenID, CellState}},
#state{x=X
+ ,y=Y
+ ,num_dead=NDead
+ ,num_alive=NAlive
,state_pairs=StatePairs
,replies_pending=RepliesPending
- ,gen_count=GenCount
+ ,gen_id=GenID
+ ,gen_began=GenBegan
,num_cells=NumCells
}=State) ->
- NewStatePairs = [{ID, CellState} | StatePairs],
+ NewStatePairs = [{CellID, CellState} | StatePairs],
NewRepliesPending = RepliesPending - 1,
- NewState = State#state{replies_pending=NewRepliesPending},
+ {NewNDead, NewNAlive} = increment_dead_or_alive(CellState, NDead, NAlive),
+ NewState = State#state{replies_pending=NewRepliesPending
+ ,num_dead=NewNDead
+ ,num_alive=NewNAlive
+ },
case NewRepliesPending of
0 ->
- NewGenCount = GenCount + 1,
SortedStatePairs = lists:sort(
fun({A, _}, {B, _}) -> A < B end,
NewStatePairs
),
StateChars = [state_to_char(S) || {_, S} <- SortedStatePairs],
+ GenDurationMic = timer:now_diff(os:timestamp(), GenBegan),
+ GenDurationMil = GenDurationMic / 1000,
+ GenDurationSec = GenDurationMic / 1000000,
+ NextGenDelay = round(?GEN_INTERVAL - GenDurationMil),
+
+ ok = life_observer:log_generation(GenID, GenDurationSec, NewNDead, NewNAlive),
+
ok = io:format(
- "CELLS: ~b GENERATIONS: ~b~n",
- [NumCells, NewGenCount]
+ "X: ~b Y: ~b CELLS: ~b DEAD: ~b ALIVE: ~b GENERATION: ~b DURATION: ~f~n",
+ [X, Y, NumCells, NewNDead, NewNAlive, GenID, GenDurationSec]
),
ok = do_print_bar(X),
-
ok = do_print_state_chars(X, StateChars),
- ok = timer:sleep(?INTERVAL),
- schedule_next_tick(),
- {noreply, NewState#state{state_pairs=[], gen_count=NewGenCount}};
+ ok = schedule_next_gen(NextGenDelay),
+ {noreply, NewState#state{state_pairs=[]}};
_N ->
{noreply, NewState#state{state_pairs=NewStatePairs}}
{noreply, State}.
-handle_info(_Msg, State) ->
- {noreply, State}.
-
-
%% ============================================================================
%% Internal
%% ============================================================================
-schedule_next_tick() ->
- gen_server:cast(?MODULE, next_tick).
+increment_dead_or_alive(0, NDead, NAlive) -> {NDead + 1, NAlive};
+increment_dead_or_alive(1, NDead, NAlive) -> {NDead, NAlive + 1}.
+
+schedule_next_gen(Delay) when Delay > 0 ->
+ erlang:send_after(Delay, self(), next_gen),
+ ok;
-cast_all([], _) -> ok;
-cast_all([Server | Servers], Msg) ->
- ok = gen_server:cast(Server, Msg),
- cast_all(Servers, Msg).
+schedule_next_gen(_) ->
+ erlang:send(self(), next_gen),
+ ok.
state_to_char(0) -> ?CHAR_DEAD;