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%%%-------------------------------------------------------------------
%%% File: dynomite_prof.erl
%%% @author Cliff Moon <> []
%%% @copyright 2009 Cliff Moon
%%% @doc
%%%
%%% @end
%%%
%%% @since 2009-02-15 by Cliff Moon
%%%-------------------------------------------------------------------
-module(dynomite_prof).
-author('cliff@powerset.com').
-behaviour(gen_server).
%% API
-export([start_link/0, start_prof/1, stop_prof/1, stats/1, averages/0, balance_prof/0]).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-record(state, {ets,balance}).
-record(profile, {name, count, sum}).
%%====================================================================
%% API
%%====================================================================
%%--------------------------------------------------------------------
%% @spec start_link() -> {ok,Pid} | ignore | {error,Error}
%% @doc Starts the server
%% @end
%%--------------------------------------------------------------------
start_link() ->
gen_server:start_link({local, dynomite_prof}, ?MODULE, [], []).
stats(Id) ->
gen_server:call(dynomite_prof, {stats, Id}).
balance_prof() ->
gen_server:cast(dynomite_prof, {balance, self(), lib_misc:now_float()}).
start_prof(Id) ->
gen_server:cast(dynomite_prof, {start, self(), Id, lib_misc:now_float()}).
stop_prof(Id) ->
gen_server:cast(dynomite_prof, {stop, self(), Id, lib_misc:now_float()}).
averages() ->
gen_server:call(dynomite_prof, averages).
%%====================================================================
%% gen_server callbacks
%%====================================================================
%%--------------------------------------------------------------------
%% @spec init(Args) -> {ok, State} |
%% {ok, State, Timeout} |
%% ignore |
%% {stop, Reason}
%% @doc Initiates the server
%% @end
%%--------------------------------------------------------------------
init([]) ->
Tid = ets:new(profiling, [set, {keypos, 2}]),
Bal = ets:new(balance, [set]),
{ok, #state{ets=Tid, balance=Bal}}.
%%--------------------------------------------------------------------
%% @spec
%% handle_call(Request, From, State) -> {reply, Reply, State} |
%% {reply, Reply, State, Timeout} |
%% {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, Reply, State} |
%% {stop, Reason, State}
%% @doc Handling call messages
%% @end
%%--------------------------------------------------------------------
handle_call({stats, Id}, _From, State = #state{ets=Ets}) ->
Reply = ets:lookup(Ets, Id),
{reply, Reply, State};
handle_call(table, _From, State = #state{ets=Ets}) ->
{reply, Ets, State};
handle_call(averages, _From, State = #state{ets=Ets,balance=Bal}) ->
Avgs = ets:foldl(fun(#profile{name=Name,count=Count,sum=Sum}, List) ->
[{Name, Sum/Count}|List]
end, [], Ets),
{_, MaxCount} = ets:foldl(fun
({Pid, Count}, {_P, M}) when Count > M -> {Pid, Count};
(_, {P, M}) -> {P, M}
end, {pid, 0}, Bal),
Balances = ets:foldl(fun({Pid, Count}, List) ->
[{Pid, Count / MaxCount} | List]
end, [], Bal),
{reply, [Balances, Avgs], State}.
%%--------------------------------------------------------------------
%% @spec handle_cast(Msg, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @doc Handling cast messages
%% @end
%%--------------------------------------------------------------------
handle_cast({balance, Pid, _Time}, State = #state{balance=Ets}) ->
case ets:lookup(Ets, Pid) of
[] -> ets:insert(Ets, {Pid, 1});
[{Pid, Count}] -> ets:insert(Ets, {Pid, Count+1})
end,
{noreply, State};
handle_cast({start, Pid, Id, Time}, State = #state{ets=_Ets}) ->
put({Pid,Id}, Time),
{noreply, State};
handle_cast({stop, Pid, Id, Time}, State = #state{ets=Ets}) ->
case get({Pid, Id}) of
undefined -> ok;
OldTime ->
erase({Pid, Id}),
increment_time(Ets, Time-OldTime, Id)
end,
{noreply, State}.
%%--------------------------------------------------------------------
%% @spec handle_info(Info, State) -> {noreply, State} |
%% {noreply, State, Timeout} |
%% {stop, Reason, State}
%% @doc Handling all non call/cast messages
%% @end
%%--------------------------------------------------------------------
handle_info(_Info, State) ->
{noreply, State}.
%%--------------------------------------------------------------------
%% @spec terminate(Reason, State) -> void()
%% @doc This function is called by a gen_server when it is about to
%% terminate. It should be the opposite of Module:init/1 and do any necessary
%% cleaning up. When it returns, the gen_server terminates with Reason.
%% The return value is ignored.
%% @end
%%--------------------------------------------------------------------
terminate(_Reason, _State) ->
ok.
%%--------------------------------------------------------------------
%% @spec code_change(OldVsn, State, Extra) -> {ok, NewState}
%% @doc Convert process state when code is changed
%% @end
%%--------------------------------------------------------------------
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
increment_time(Ets, Time, Id) ->
case ets:lookup(Ets, Id) of
[] -> ets:insert(Ets, #profile{name=Id,count=1,sum=Time});
[#profile{name=Id,count=Count,sum=Sum}] -> ets:insert(Ets, #profile{name=Id,count=Count+1,sum=Sum+Time})
end.
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