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path: root/src/pbx_invoke.erl
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-module(pbx_invoke).
-behaviour(gen_server).
-define(SERVER, ?MODULE).

-export([start_link/0]).
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
	 terminate/2, code_change/3]).

-export([next/0, get/0, set/1]).

-define(MAXCOUNT, 32767).

start_link() ->
	gen_server:start_link({local, ?SERVER}, ?MODULE, [], []).

%%%

init(_Args) ->
	{ok, 0}.

handle_call(next, _From, N) when N >= ?MAXCOUNT ->
	{reply, 0, 0};
handle_call(next, _From, N) ->
	{reply, N + 1, N + 1};
handle_call(get, _From, N) ->
	{reply, N, N};
handle_call({set, N}, _From, _N) ->
	{reply, ok, N}.

handle_cast(_Msg, State) ->
	{noreply, State}.

handle_info(_Info, State) ->
	{noreply, State}.

terminate(_Reason, _State) ->
	ok.

code_change(_OldVsn, State, _Extra) ->
	{ok, State}.

%%%

set({present, N}) ->
	gen_server:call(?SERVER, {set, N}).

next() ->
	N = gen_server:call(?SERVER, next),
	{present, N}.

get() ->
	N = gen_server:call(?SERVER, gete),
	{present, N}.