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[cellular-automata.git] / 001 / src / life_cell.erl

diff --git a/001/src/life_cell.erl b/001/src/life_cell.erl
deleted file mode 100644 (file)
index e7cebcd..0000000
--- a/001/src/life_cell.erl
+++ /dev/null
@@ -1,141 +0,0 @@
--module(life_cell).
--behaviour(gen_server).
-
-
-%% API
--export([start_link/1]).
-
-%% Callbacks
--export([init/1
-        ,handle_call/3
-        ,handle_cast/2
-        ,handle_info/2
-        ,terminate/2
-        ,code_change/3
-        ]).
-
-
--record(state, {cell_id         :: integer()
-               ,name            :: string()
-               ,cell_state      :: 0 | 1
-               ,neighbors       :: list(atom())
-               ,live_neighbors  :: integer()
-               ,num_neighbors   :: integer()
-               ,replies_pending :: integer()
-               ,gen_id          :: integer()
-               }).
-
-
-%% ============================================================================
-%% API
-%% ============================================================================
-
-start_link({_, Name, _}=Datum) ->
-    ServerName = {local, Name},
-    Args = [Datum],
-    Opts = [],
-    gen_server:start_link(ServerName, ?MODULE, Args, Opts).
-
-
-%% ============================================================================
-%% Callbacks
-%% ============================================================================
-
-init([{CellID, Name, NeighborNames}]) ->
-    State = #state{cell_id         = CellID
-                  ,name            = Name
-                  ,cell_state      = crypto:rand_uniform(0, 2)
-                  ,neighbors       = NeighborNames
-                  ,num_neighbors   = length(NeighborNames)
-                  ,live_neighbors  = 0
-                  ,replies_pending = 0
-                  },
-    {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_gen, GenID},
-    #state{cell_state=CellState
-          ,neighbors=Neighbors
-          ,num_neighbors=NumNeighbors
-          }=State) ->
-
-    ok = cast_all(Neighbors, {state_broadcast, GenID, CellState}),
-    {noreply, State#state{replies_pending=NumNeighbors, gen_id=GenID}};
-
-
-%% If we receive 'state_broadcast' before we receive 'next_gen', throw it back
-%% in the queue. (Took me a while to realize this, but sometimes it is
-%% possible. The more there're cells, the more likely this is to happen.)
-handle_cast({state_broadcast, ReceivedGenID, _NeighborState}=Msg,
-    #state{gen_id=GenID, name=Name}=State) when GenID =/= ReceivedGenID->
-    ok = gen_server:cast(Name, Msg),
-    {noreply, State};
-
-
-%% Now that we can be sure that this request is for the current generation, we
-%% can handle it
-handle_cast({state_broadcast, GenID, NeighborState},
-    #state{cell_id=CellID
-          ,gen_id=GenID
-          ,replies_pending=Pending
-          ,cell_state=CellState
-          ,live_neighbors=LiveNeighbors
-          }=State) ->
-
-    NewPending = Pending - 1,
-    NewLiveNeighbors = LiveNeighbors + NeighborState,
-
-    NewState = State#state{replies_pending=NewPending
-                          ,live_neighbors=NewLiveNeighbors
-                          },
-
-    case NewPending of
-        0 ->
-            NewCellState = new_state(CellState, NewLiveNeighbors),
-            ok = life_time:report_state(CellID, GenID, NewCellState),
-
-            {noreply, NewState#state{live_neighbors=0
-                                    ,cell_state=NewCellState
-                                    }
-            };
-
-        _N ->
-            {noreply, NewState}
-    end;
-
-
-handle_cast(_Msg, State) ->
-    {noreply, State}.
-
-
-handle_info(_Msg, State) ->
-    {noreply, State}.
-
-
-%% ============================================================================
-%% Internal
-%% ============================================================================
-
-cast_all([], _) -> ok;
-cast_all([Server | Servers], Msg) ->
-    ok = gen_server:cast(Server, Msg),
-    cast_all(Servers, Msg).
-
-
-new_state(1, LiveNeighbors) when LiveNeighbors  <  2 -> 0;
-new_state(1, LiveNeighbors) when LiveNeighbors  <  4 -> 1;
-new_state(1, LiveNeighbors) when LiveNeighbors  >  3 -> 0;
-new_state(0, LiveNeighbors) when LiveNeighbors =:= 3 -> 1;
-new_state(State, _LiveNeighbors) -> State.