1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
-module(dummy_server).
-behaviour(gen_server).
-export([start_link/0, set_state/1, get_state/0]).
-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, [], []).
set_state(What) ->
gen_server:call(?MODULE, {set_state, What}).
get_state() ->
gen_server:call(?MODULE, get_state).
%%
init([]) ->
say("init, setting state to 0", []),
{ok, 0}.
handle_call({set_state, NewState}, _From, _State) ->
{reply, {ok, NewState}, NewState};
handle_call(get_state, _From, State) ->
{reply, State, State}.
handle_cast('__not_implemented', State) ->
{noreply, State}.
handle_info(_Info, State) ->
say("info ~p, ~p.", [_Info, State]),
{noreply, State}.
terminate(_Reason, _State) ->
say("terminate ~p, ~p", [_Reason, _State]),
ok.
code_change(_OldVsn, State, _Extra) ->
say("code_change ~p, ~p, ~p", [_OldVsn, State, _Extra]),
{ok, State}.
%% Internal
say(Format, Data) ->
io:format("~p:~p: ~s~n", [?MODULE, self(), io_lib:format(Format, Data)]).
|
