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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2017-2022. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(oc_statem).
-behaviour(gen_statem).
%% API
-export([start/1]).
%% gen_statem callbacks
-export([init/1, callback_mode/0, handle_event/4]).
start(Opts) ->
gen_statem:start({local, ?MODULE}, ?MODULE, [], Opts).
init([]) ->
%% Supervise state machine parent i.e the test case, and if it dies
%% (fails due to some reason), kill the state machine,
%% just to not leak resources (process, name, ETS table, etc...)
%%
Parent = gen:get_parent(),
Statem = self(),
_Supervisor =
spawn(
fun () ->
StatemRef = monitor(process, Statem),
ParentRef = monitor(process, Parent),
receive
{'DOWN', StatemRef, _, _, Reason} ->
exit(Reason);
{'DOWN', ParentRef, _, _, _} ->
exit(Statem, kill)
end
end),
{ok, state_2, [undefined]}.
callback_mode() ->
[handle_event_function, state_enter].
handle_event(enter, _OldState, state_2, [undefined|Data]) ->
{keep_state, [enter|Data]};
handle_event({call,From}, get_data, state_2, Data) ->
{keep_state_and_data, [{reply,From,hd(Data)}]};
handle_event(
{call,From}, {push_callback_module,_NewModule} = Action,
state_2, [enter|Data]) ->
{next_state, state_1, [undefined|Data],
[Action,
{reply,From,ok}]};
handle_event(
{call,From}, pop_callback_module = Action,
state_2, [enter|_Data]) ->
{keep_state_and_data,
[Action,
{reply,From,ok}]}.
|
