%%%------------------------------------------------------------------- %%% @author Jesper Louis andersen <> %%% @copyright (C) 2011, Jesper Louis andersen %%% @doc %%% %%% @end %%% Created : 11 Nov 2011 by Jesper Louis andersen <> %%%------------------------------------------------------------------- -module(queue_srv). -behaviour(gen_server). %% API -export([start_link/1, stop/0, len/0, in/1, in/2, is_empty/0, out/0, out/1, pout/0, is_queue/0, to_list/0]). %% gen_server callbacks -export([init/1, handle_call/3, handle_cast/2, handle_info/2, terminate/2, code_change/3]). -define(SERVER, ?MODULE). -record(state, { mod, q }). %%%=================================================================== %%% API %%%=================================================================== %%-------------------------------------------------------------------- %% @doc %% Starts the server %% %% @spec start_link(Mod) -> {ok, Pid} | ignore | {error, Error} %% @end %%-------------------------------------------------------------------- start_link(Mod) -> gen_server:start_link({local, ?SERVER}, ?MODULE, [Mod], []). stop() -> gen_server:stop(?SERVER). call(M) -> gen_server:call(?SERVER, M, infinity). in(I) -> call({in, I}). in(I, P) -> call({in, I, P}). len() -> call(len). is_empty() -> call(is_empty). is_queue() -> call(is_queue). to_list() -> call(to_list). out() -> call(out). out(P) -> call({out, P}). pout() -> call(pout). %%%=================================================================== %%% gen_server callbacks %%%=================================================================== %%-------------------------------------------------------------------- %% @private %% @doc %% Initializes the server %% %% @spec init(Args) -> {ok, State} | %% {ok, State, Timeout} | %% ignore | %% {stop, Reason} %% @end %%-------------------------------------------------------------------- init([Mod]) -> {ok, #state{ mod = Mod, q = Mod:new() }}. %%-------------------------------------------------------------------- %% @private %% @doc %% Handling call messages %% %% @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} %% @end %%-------------------------------------------------------------------- handle_call({in, Item}, _F, #state { q = Q, mod = M } = S) -> NQ = M:in(Item, Q), {reply, ok, S#state { q = NQ }}; handle_call({in, Item, Prio}, _F, #state { q = Q, mod = M } = S) -> NQ = M:in(Item, Prio, Q), {reply, ok, S#state { q = NQ }}; handle_call({out, P}, _F, #state { q = Q, mod = M } = S) -> {R, NQ} = M:out(P, Q), {reply, R, S#state { q = NQ }}; handle_call(Ty, _F, #state { q = Q, mod = M } = S) when Ty == out; Ty == pout -> {R, NQ} = M:Ty(Q), {reply, R, S#state { q = NQ }}; handle_call(Ty, _F, #state { q = Q, mod = M } = S) when Ty == is_queue; Ty == is_empty; Ty == len; Ty == to_list -> R = M:Ty(Q), {reply, R, S}; handle_call(Req, From, State) -> error_logger:info_report([{handle_call, Req, From, State}]), Reply = ok, {reply, Reply, State}. %%-------------------------------------------------------------------- %% @private %% @doc %% Handling cast messages %% %% @spec handle_cast(Msg, State) -> {noreply, State} | %% {noreply, State, Timeout} | %% {stop, Reason, State} %% @end %%-------------------------------------------------------------------- handle_cast(_Msg, State) -> {noreply, State}. %%-------------------------------------------------------------------- %% @private %% @doc %% Handling all non call/cast messages %% %% @spec handle_info(Info, State) -> {noreply, State} | %% {noreply, State, Timeout} | %% {stop, Reason, State} %% @end %%-------------------------------------------------------------------- handle_info(_Info, State) -> {noreply, State}. %%-------------------------------------------------------------------- %% @private %% @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. %% %% @spec terminate(Reason, State) -> void() %% @end %%-------------------------------------------------------------------- terminate(_Reason, _State) -> ok. %%-------------------------------------------------------------------- %% @private %% @doc %% Convert process state when code is changed %% %% @spec code_change(OldVsn, State, Extra) -> {ok, NewState} %% @end %%-------------------------------------------------------------------- code_change(_OldVsn, State, _Extra) -> {ok, State}. %%%=================================================================== %%% Internal functions %%%===================================================================