prime_server.erl

-module (prime_server).
-behaviour (gen_server).

-export ([start_link/0, new_prime/1]).

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

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

new_prime(N) -> gen_server:call(?MODULE, {prime, N}, 20000).

init([]) ->
    process_flag(trap_exit, true),
    io:format("~p starting~n", [?MODULE]),
    {ok, 0}.

handle_call({prime, K}, _From, N) ->
    {reply, make_new_prime(K), N+1}.

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

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

terminate(_Reason, _N) ->
    io:format("~p stopping~n", [?MODULE]),
    ok.

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

make_new_prime(K) ->
    if
        K > 100 ->
            alarm_handler:set_alarm(tooHot),
            N = lib_primes:make_prime(K),
            alarm_handler:clear_alarm(tooHot),
            N;
        true ->
            lib_primes:make_prime(K)
    end.