/
lock_fsm.erl
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/
lock_fsm.erl
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%% -*- erlang-indent-level: 4;indent-tabs-mode: nil -*-
%% ex: ts=4 sw=4 et
%%
%% This file is part of Triq - Trifork QuickCheck
%%
%% Copyright (c) 2013 Tuncer Ayaz
%%
%% 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.
%%
%%
%% Trivial gen_fsm based on example from gen_fsm Users' Guide
%% http://www.erlang.org/doc/design_principles/fsm.html
%%
-module(lock_fsm).
-behaviour(gen_fsm).
-export([start/1,
stop/0,
init/1,
handle_event/3,
handle_info/3,
handle_sync_event/4,
code_change/4,
terminate/3]).
-export([button/1,
locked/2,
unlocked/2]).
-export([initial_state/0,
initial_state_data/0,
precondition/4,
postcondition/5,
next_state_data/5]).
-export([locked/1,
unlocked/1]).
-include("triq.hrl").
-include_lib("eunit/include/eunit.hrl").
-define(TIMEOUT, 1000).
-define(CODE, [1, 2, 3, 4]).
-type digit() :: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9.
-type code() :: [digit()].
-record(state_data, {sofar :: code(),
code :: code()}).
%%=====================================================================
%% API
%%=====================================================================
start(Code) ->
gen_fsm:start({local, ?MODULE}, ?MODULE, lists:reverse(Code), []).
stop() ->
gen_fsm:send_all_state_event(?MODULE, stop).
button(Digit) ->
gen_fsm:send_event(?MODULE, {button, Digit}).
%%=====================================================================
%% gen_fsm callbacks
%%=====================================================================
init(Code) ->
{ok, locked, #state_data{sofar=[], code=Code}}.
locked({button, Digit}, #state_data{sofar=SoFar, code=Code}=StateData) ->
case [Digit|SoFar] of
Code ->
{next_state, unlocked, StateData#state_data{sofar=[]}, ?TIMEOUT};
Incomplete when length(Incomplete) < length(Code) ->
{next_state, locked, StateData#state_data{sofar=Incomplete}};
_Wrong ->
{next_state, locked, StateData#state_data{sofar=[]}}
end.
unlocked(timeout, State) ->
{next_state, locked, State};
unlocked({button, _}, State) ->
{next_state, locked, State, ?TIMEOUT}.
handle_event(stop, _StateName, StateData) ->
{stop, normal, StateData}.
handle_sync_event(_Event, _From, StateName, StateData) ->
{next_state, StateName, StateData}.
handle_info(_Info, _StateName, _StateData) ->
ok.
terminate(normal, _StateName, _StateData) ->
ok.
code_change(_OldVsn, StateName, StateData, _Extra) ->
{ok, StateName, StateData}.
%%=====================================================================
%% Triq fsm callbacks/specification
%%=====================================================================
locked(_State) ->
[{unlocked, {call, ?MODULE, button, [digit()]}}].
unlocked(_State) ->
[{locked, {call, ?MODULE, button, [digit()]}}].
digit() ->
choose(0,9).
initial_state() ->
locked.
initial_state_data() ->
#state_data{}.
precondition(_From, _Target, _StateData, {call,_,_,_}) ->
true.
postcondition(_From, _Target, _StateData, {call,_,_,_}, Result) ->
Result =:= ok.
next_state_data(_From, _Target, StateData, _Result, {call,_,_,_}) ->
StateData.
%%=====================================================================
%% Properties and unit tests
%%=====================================================================
prop_lock_fsm() ->
?FORALL(
Cmds, triq_fsm:commands(?MODULE),
begin
start(?CODE),
{History, State, Result} = triq_fsm:run_commands(?MODULE, Cmds),
stop(),
?WHENFAIL(io:format(user,
"History: ~p~n"
"State: ~p~n"
"Result: ~p~n",
[History, State, Result]),
Result =:= ok)
end).
lock_fsm_test_() ->
{timeout, 10,
fun() ->
?assert(triq:module(?MODULE))
end}.