%% %% %CopyrightBegin% %% %% Copyright Ericsson AB 2016. 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(gen_statem_SUITE). -include_lib("common_test/include/ct.hrl"). -compile(export_all). -behaviour(gen_statem). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% suite() -> [{ct_hooks,[ts_install_cth]}, {timetrap,{minutes,1}}]. all() -> [{group, start}, {group, start_handle_event}, {group, stop}, {group, stop_handle_event}, {group, abnormal}, {group, abnormal_handle_event}, shutdown, stop_and_reply, state_enter, event_order, code_change, {group, sys}, hibernate, enter_loop]. groups() -> [{start, [], tcs(start)}, {start_handle_event, [], tcs(start)}, {stop, [], tcs(stop)}, {stop_handle_event, [], tcs(stop)}, {abnormal, [], tcs(abnormal)}, {abnormal_handle_event, [], tcs(abnormal)}, {sys, [], tcs(sys)}, {sys_handle_event, [], tcs(sys)}]. tcs(start) -> [start1, start2, start3, start4, start5, start6, start7, start8, start9, start10, start11, start12, next_events]; tcs(stop) -> [stop1, stop2, stop3, stop4, stop5, stop6, stop7, stop8, stop9, stop10]; tcs(abnormal) -> [abnormal1, abnormal1clean, abnormal1dirty, abnormal2]; tcs(sys) -> [sys1, call_format_status, error_format_status, terminate_crash_format, get_state, replace_state]. init_per_suite(Config) -> Config. end_per_suite(_Config) -> ok. init_per_group(GroupName, Config) when GroupName =:= start_handle_event; GroupName =:= stop_handle_event; GroupName =:= abnormal_handle_event; GroupName =:= sys_handle_event -> [{callback_mode,handle_event_function}|Config]; init_per_group(_GroupName, Config) -> Config. end_per_group(_GroupName, Config) -> Config. init_per_testcase(_CaseName, Config) -> flush(), %%% dbg:tracer(), %%% dbg:p(all, c), %%% dbg:tpl(gen_statem, cx), %%% dbg:tpl(proc_lib, cx), %%% dbg:tpl(gen, cx), %%% dbg:tpl(sys, cx), Config. end_per_testcase(_CaseName, Config) -> %%% dbg:stop(), Config. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -define(EXPECT_FAILURE(Code, Reason), try begin Code end of Reason -> ct:fail({unexpected,Reason}) catch error:Reason -> Reason; exit:Reason -> Reason end). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% anonymous start1(Config) -> %%OldFl = process_flag(trap_exit, true), {ok,Pid0} = gen_statem:start_link(?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid0), ok = do_sync_func_test(Pid0), stop_it(Pid0), %% stopped = gen_statem:call(Pid0, stop), %% timeout = %% ?EXPECT_FAILURE(gen_statem:call(Pid0, hej), Reason), %%process_flag(trap_exit, OldFl), ok = verify_empty_msgq(). %% anonymous w. shutdown start2(Config) -> %% Dont link when shutdown {ok,Pid0} = gen_statem:start(?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid0), ok = do_sync_func_test(Pid0), stopped = gen_statem:call(Pid0, {stop,shutdown}), check_stopped(Pid0), ok = verify_empty_msgq(). %% anonymous with timeout start3(Config) -> %%OldFl = process_flag(trap_exit, true), {ok,Pid0} = gen_statem:start(?MODULE, start_arg(Config, []), [{timeout,5}]), ok = do_func_test(Pid0), ok = do_sync_func_test(Pid0), stop_it(Pid0), {error,timeout} = gen_statem:start( ?MODULE, start_arg(Config, sleep), [{timeout,5}]), %%process_flag(trap_exit, OldFl), ok = verify_empty_msgq(). %% anonymous with ignore start4(Config) -> OldFl = process_flag(trap_exit, true), ignore = gen_statem:start(?MODULE, start_arg(Config, ignore), []), process_flag(trap_exit, OldFl), ok = verify_empty_msgq(). %% anonymous with stop start5(Config) -> OldFl = process_flag(trap_exit, true), {error,stopped} = gen_statem:start(?MODULE, start_arg(Config, stop), []), process_flag(trap_exit, OldFl), ok = verify_empty_msgq(). %% anonymous linked start6(Config) -> {ok,Pid} = gen_statem:start_link(?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid), ok = do_sync_func_test(Pid), stop_it(Pid), ok = verify_empty_msgq(). %% global register linked start7(Config) -> STM = {global,my_stm}, {ok,Pid} = gen_statem:start_link(STM, ?MODULE, start_arg(Config, []), []), {error,{already_started,Pid}} = gen_statem:start_link(STM, ?MODULE, start_arg(Config, []), []), {error,{already_started,Pid}} = gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid), ok = do_sync_func_test(Pid), ok = do_func_test(STM), ok = do_sync_func_test(STM), stop_it(STM), ok = verify_empty_msgq(). %% local register start8(Config) -> %%OldFl = process_flag(trap_exit, true), Name = my_stm, STM = {local,Name}, {ok,Pid} = gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), {error,{already_started,Pid}} = gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid), ok = do_sync_func_test(Pid), ok = do_func_test(Name), ok = do_sync_func_test(Name), stop_it(Pid), %%process_flag(trap_exit, OldFl), ok = verify_empty_msgq(). %% local register linked start9(Config) -> %%OldFl = process_flag(trap_exit, true), Name = my_stm, STM = {local,Name}, {ok,Pid} = gen_statem:start_link(STM, ?MODULE, start_arg(Config, []), []), {error,{already_started,Pid}} = gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid), ok = do_sync_func_test(Pid), ok = do_func_test(Name), ok = do_sync_func_test(Name), stop_it(Pid), %%process_flag(trap_exit, OldFl), ok = verify_empty_msgq(). %% global register start10(Config) -> STM = {global,my_stm}, {ok,Pid} = gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), {error,{already_started,Pid}} = gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), {error,{already_started,Pid}} = gen_statem:start_link(STM, ?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid), ok = do_sync_func_test(Pid), ok = do_func_test(STM), ok = do_sync_func_test(STM), stop_it(STM), ok = verify_empty_msgq(). %% Stop registered processes start11(Config) -> Name = my_stm, LocalSTM = {local,Name}, GlobalSTM = {global,Name}, {ok,Pid} = gen_statem:start_link(LocalSTM, ?MODULE, start_arg(Config, []), []), stop_it(Pid), {ok,_Pid1} = gen_statem:start_link(LocalSTM, ?MODULE, start_arg(Config, []), []), stop_it(Name), {ok,Pid2} = gen_statem:start(GlobalSTM, ?MODULE, start_arg(Config, []), []), stop_it(Pid2), receive after 1 -> true end, Result = gen_statem:start(GlobalSTM, ?MODULE, start_arg(Config, []), []), ct:log("Result = ~p~n",[Result]), {ok,_Pid3} = Result, stop_it(GlobalSTM), ok = verify_empty_msgq(). %% Via register linked start12(Config) -> dummy_via:reset(), VIA = {via,dummy_via,my_stm}, {ok,Pid} = gen_statem:start_link(VIA, ?MODULE, start_arg(Config, []), []), {error,{already_started,Pid}} = gen_statem:start_link(VIA, ?MODULE, start_arg(Config, []), []), {error,{already_started,Pid}} = gen_statem:start(VIA, ?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid), ok = do_sync_func_test(Pid), ok = do_func_test(VIA), ok = do_sync_func_test(VIA), stop_it(VIA), ok = verify_empty_msgq(). %% Anonymous, reason 'normal' stop1(Config) -> {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), ok = gen_statem:stop(Pid), false = erlang:is_process_alive(Pid), noproc = ?EXPECT_FAILURE(gen_statem:stop(Pid), Reason). %% Anonymous, other reason stop2(Config) -> {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), ok = gen_statem:stop(Pid, other_reason, infinity), false = erlang:is_process_alive(Pid), ok. %% Anonymous, invalid timeout stop3(Config) -> {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), _ = ?EXPECT_FAILURE( gen_statem:stop(Pid, other_reason, invalid_timeout), Reason), true = erlang:is_process_alive(Pid), ok = gen_statem:stop(Pid), false = erlang:is_process_alive(Pid), ok. %% Registered name stop4(Config) -> {ok,Pid} = gen_statem:start( {local,to_stop},?MODULE, start_arg(Config, []), []), ok = gen_statem:stop(to_stop), false = erlang:is_process_alive(Pid), noproc = ?EXPECT_FAILURE(gen_statem:stop(to_stop), Reason), ok. %% Registered name and local node stop5(Config) -> Name = to_stop, {ok,Pid} = gen_statem:start( {local,Name},?MODULE, start_arg(Config, []), []), ok = gen_statem:stop({Name,node()}), false = erlang:is_process_alive(Pid), noproc = ?EXPECT_FAILURE(gen_statem:stop({Name,node()}), Reason), ok. %% Globally registered name stop6(Config) -> STM = {global,to_stop}, {ok,Pid} = gen_statem:start(STM, ?MODULE, start_arg(Config, []), []), ok = gen_statem:stop(STM), false = erlang:is_process_alive(Pid), noproc = ?EXPECT_FAILURE(gen_statem:stop(STM), Reason), ok. %% 'via' registered name stop7(Config) -> VIA = {via,dummy_via,to_stop}, dummy_via:reset(), {ok,Pid} = gen_statem:start(VIA, ?MODULE, start_arg(Config, []), []), ok = gen_statem:stop(VIA), false = erlang:is_process_alive(Pid), noproc = ?EXPECT_FAILURE(gen_statem:stop(VIA), Reason), ok. %% Anonymous on remote node stop8(Config) -> Node = gen_statem_stop8, {ok,NodeName} = ct_slave:start(Node), Dir = filename:dirname(code:which(?MODULE)), rpc:call(NodeName, code, add_path, [Dir]), {ok,Pid} = rpc:call( NodeName, gen_statem,start, [?MODULE,start_arg(Config, []),[]]), ok = gen_statem:stop(Pid), false = rpc:call(NodeName, erlang, is_process_alive, [Pid]), noproc = ?EXPECT_FAILURE(gen_statem:stop(Pid), Reason1), {ok,NodeName} = ct_slave:stop(Node), {{nodedown,NodeName},{sys,terminate,_}} = ?EXPECT_FAILURE(gen_statem:stop(Pid), Reason2), ok. %% Registered name on remote node stop9(Config) -> Name = to_stop, LocalSTM = {local,Name}, Node = gen_statem__stop9, {ok,NodeName} = ct_slave:start(Node), STM = {Name,NodeName}, Dir = filename:dirname(code:which(?MODULE)), rpc:call(NodeName, code, add_path, [Dir]), {ok,Pid} = rpc:call( NodeName, gen_statem, start, [LocalSTM,?MODULE,start_arg(Config, []),[]]), ok = gen_statem:stop(STM), undefined = rpc:call(NodeName,erlang,whereis,[Name]), false = rpc:call(NodeName,erlang,is_process_alive,[Pid]), noproc = ?EXPECT_FAILURE(gen_statem:stop(STM), Reason1), {ok,NodeName} = ct_slave:stop(Node), {{nodedown,NodeName},{sys,terminate,_}} = ?EXPECT_FAILURE(gen_statem:stop(STM), Reason2), ok. %% Globally registered name on remote node stop10(Config) -> Node = gen_statem_stop10, STM = {global,to_stop}, {ok,NodeName} = ct_slave:start(Node), Dir = filename:dirname(code:which(?MODULE)), rpc:call(NodeName,code,add_path,[Dir]), {ok,Pid} = rpc:call( NodeName, gen_statem, start, [STM,?MODULE,start_arg(Config, []),[]]), global:sync(), ok = gen_statem:stop(STM), false = rpc:call(NodeName, erlang, is_process_alive, [Pid]), noproc = ?EXPECT_FAILURE(gen_statem:stop(STM), Reason1), {ok,NodeName} = ct_slave:stop(Node), noproc = ?EXPECT_FAILURE(gen_statem:stop(STM), Reason2), ok. %% Check that time outs in calls work abnormal1(Config) -> Name = abnormal1, LocalSTM = {local,Name}, {ok, _Pid} = gen_statem:start(LocalSTM, ?MODULE, start_arg(Config, []), []), %% timeout call. delayed = gen_statem:call(Name, {delayed_answer,1}, 100), {timeout,_} = ?EXPECT_FAILURE( gen_statem:call(Name, {delayed_answer,1000}, 10), Reason), ok = gen_statem:stop(Name), ?t:sleep(1100), ok = verify_empty_msgq(). %% Check that time outs in calls work abnormal1clean(Config) -> Name = abnormal1clean, LocalSTM = {local,Name}, {ok, _Pid} = gen_statem:start(LocalSTM, ?MODULE, start_arg(Config, []), []), %% timeout call. delayed = gen_statem:call(Name, {delayed_answer,1}, {clean_timeout,100}), {timeout,_} = ?EXPECT_FAILURE( gen_statem:call( Name, {delayed_answer,1000}, {clean_timeout,10}), Reason), ok = gen_statem:stop(Name), ?t:sleep(1100), ok = verify_empty_msgq(). %% Check that time outs in calls work abnormal1dirty(Config) -> Name = abnormal1dirty, LocalSTM = {local,Name}, {ok, _Pid} = gen_statem:start(LocalSTM, ?MODULE, start_arg(Config, []), []), %% timeout call. delayed = gen_statem:call(Name, {delayed_answer,1}, {dirty_timeout,100}), {timeout,_} = ?EXPECT_FAILURE( gen_statem:call( Name, {delayed_answer,1000}, {dirty_timeout,10}), Reason), ok = gen_statem:stop(Name), ?t:sleep(1100), case flush() of [{Ref,delayed}] when is_reference(Ref) -> ok end. %% Check that bad return values makes the stm crash. Note that we must %% trap exit since we must link to get the real bad_return_ error abnormal2(Config) -> OldFl = process_flag(trap_exit, true), {ok,Pid} = gen_statem:start_link(?MODULE, start_arg(Config, []), []), %% bad return value in the gen_statem loop {{bad_return_from_state_function,badreturn},_} = ?EXPECT_FAILURE(gen_statem:call(Pid, badreturn), Reason), receive {'EXIT',Pid,{bad_return_from_state_function,badreturn}} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, process_flag(trap_exit, OldFl), ok = verify_empty_msgq(). shutdown(Config) -> process_flag(trap_exit, true), {ok,Pid0} = gen_statem:start_link(?MODULE, start_arg(Config, []), []), ok = do_func_test(Pid0), ok = do_sync_func_test(Pid0), stopped = gen_statem:call(Pid0, {stop,{shutdown,reason}}), receive {'EXIT',Pid0,{shutdown,reason}} -> ok end, process_flag(trap_exit, false), {noproc,_} = ?EXPECT_FAILURE(gen_statem:call(Pid0, hej), Reason), receive Any -> ct:log("Unexpected: ~p", [Any]), ct:fail({unexpected,Any}) after 500 -> ok end. stop_and_reply(_Config) -> process_flag(trap_exit, true), Machine = %% Abusing the internal format of From... #{init => fun () -> {ok,start,undefined} end, start => fun (cast, {echo,From1,Reply1}, undefined) -> {next_state,wait,{reply,From1,Reply1}} end, wait => fun (cast, {stop_and_reply,Reason,From2,Reply2},R1) -> {stop_and_reply,Reason, [R1,{reply,From2,Reply2}]} end}, {ok,STM} = gen_statem:start_link(?MODULE, {map_statem,Machine,[]}, []), Self = self(), Tag1 = make_ref(), gen_statem:cast(STM, {echo,{Self,Tag1},reply1}), Tag2 = make_ref(), gen_statem:cast(STM, {stop_and_reply,reason,{Self,Tag2},reply2}), case flush() of [{Tag1,reply1},{Tag2,reply2},{'EXIT',STM,reason}] -> ok; Other1 -> ct:fail({unexpected,Other1}) end, {noproc,_} = ?EXPECT_FAILURE(gen_statem:call(STM, hej), Reason), case flush() of [] -> ok; Other2 -> ct:fail({unexpected,Other2}) end. state_enter(_Config) -> process_flag(trap_exit, true), Self = self(), Machine = %% Abusing the internal format of From... #{init => fun () -> {ok,start,1} end, start => fun (enter, Prev, N) -> Self ! {enter,start,Prev,N}, {keep_state,N + 1}; (internal, Prev, N) -> Self ! {internal,start,Prev,N}, {keep_state,N + 1}; ({call,From}, echo, N) -> {next_state,wait,N + 1,{reply,From,{echo,start,N}}}; ({call,From}, {stop,Reason}, N) -> {stop_and_reply,Reason,[{reply,From,{stop,N}}],N + 1} end, wait => fun (enter, Prev, N) -> Self ! {enter,wait,Prev,N}, {keep_state,N + 1}; ({call,From}, echo, N) -> {next_state,start,N + 1, [{next_event,internal,wait}, {reply,From,{echo,wait,N}}]} end}, {ok,STM} = gen_statem:start_link( ?MODULE, {map_statem,Machine,[state_enter]}, []), [{enter,start,start,1}] = flush(), {echo,start,2} = gen_statem:call(STM, echo), [{enter,wait,start,3}] = flush(), {wait,[4|_]} = sys:get_state(STM), {echo,wait,4} = gen_statem:call(STM, echo), [{enter,start,wait,5},{internal,start,wait,6}] = flush(), {stop,7} = gen_statem:call(STM, {stop,bye}), [{'EXIT',STM,bye}] = flush(), {noproc,_} = ?EXPECT_FAILURE(gen_statem:call(STM, hej), Reason), case flush() of [] -> ok; Other2 -> ct:fail({unexpected,Other2}) end. event_order(_Config) -> process_flag(trap_exit, true), Machine = %% Abusing the internal format of From... #{init => fun () -> {ok,start,undefined} end, start => fun (cast, _, _) -> {keep_state_and_data,postpone}; %% Handled in 'buffer' ({call,From}, {buffer,Pid,[Tag3,Tag4,Tag5]}, undefined) -> {next_state,buffer,[], [{next_event,internal,{reply,{Pid,Tag3},ok3}}, {next_event,internal,{reply,{Pid,Tag4},ok4}}, {timeout,0,{reply,{Pid,Tag5},ok5}}, %% The timeout should not happen since there %% are events that cancel it i.e next_event %% and postponed {reply,From,ok}]} end, buffer => fun (internal, Reply, Replies) -> {keep_state,[Reply|Replies]}; (timeout, Reply, Replies) -> {keep_state,[Reply|Replies]}; (cast, Reply, Replies) -> {keep_state,[Reply|Replies]}; ({call,From}, {stop,Reason}, Replies) -> {next_state,stop,undefined, lists:reverse( Replies, [{reply,From,ok}, {next_event,internal,{stop,Reason}}])} end, stop => fun (internal, Result, undefined) -> Result end}, {ok,STM} = gen_statem:start_link(?MODULE, {map_statem,Machine,[]}, []), Self = self(), Tag1 = make_ref(), gen_statem:cast(STM, {reply,{Self,Tag1},ok1}), Tag2 = make_ref(), gen_statem:cast(STM, {reply,{Self,Tag2},ok2}), Tag3 = make_ref(), Tag4 = make_ref(), Tag5 = make_ref(), ok = gen_statem:call(STM, {buffer,Self,[Tag3,Tag4,Tag5]}), ok = gen_statem:call(STM, {stop,reason}), case flush() of [{Tag3,ok3},{Tag4,ok4},{Tag1,ok1},{Tag2,ok2}, {'EXIT',STM,reason}] -> ok; Other1 -> ct:fail({unexpected,Other1}) end, {noproc,_} = ?EXPECT_FAILURE(gen_statem:call(STM, hej), Reason), case flush() of [] -> ok; Other2 -> ct:fail({unexpected,Other2}) end. sys1(Config) -> {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), {status, Pid, {module,gen_statem}, _} = sys:get_status(Pid), sys:suspend(Pid), Parent = self(), Tag = make_ref(), Caller = spawn( fun () -> Parent ! {Tag,gen_statem:call(Pid, hej)} end), receive {Tag,_} -> ct:fail(should_be_suspended) after 3000 -> exit(Caller, ok) end, %% {timeout,_} = %% ?EXPECT_FAILURE(gen_statem:call(Pid, hej), Reason), sys:resume(Pid), stop_it(Pid). code_change(_Config) -> {ok,Pid} = gen_statem:start( ?MODULE, {callback_mode,state_functions,[]}, []), {idle,data} = sys:get_state(Pid), sys:suspend(Pid), Mode = handle_event_function, sys:change_code(Pid, ?MODULE, old_vsn, Mode), sys:resume(Pid), {idle,{old_vsn,data,Mode}} = sys:get_state(Pid), Mode = gen_statem:call(Pid, get_callback_mode), stop_it(Pid). call_format_status(Config) -> {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), Status = sys:get_status(Pid), {status,Pid,_Mod,[_PDict,running,_,_, Data]} = Status, [format_status_called|_] = lists:reverse(Data), stop_it(Pid), %% check that format_status can handle a name being an atom (pid is %% already checked by the previous test) {ok, Pid2} = gen_statem:start( {local, gstm}, ?MODULE, start_arg(Config, []), []), Status2 = sys:get_status(gstm), {status,Pid2,_Mod,[_PDict2,running,_,_,Data2]} = Status2, [format_status_called|_] = lists:reverse(Data2), stop_it(Pid2), %% check that format_status can handle a name being a term other than a %% pid or atom GlobalName1 = {global,"CallFormatStatus"}, {ok,Pid3} = gen_statem:start( GlobalName1, ?MODULE, start_arg(Config, []), []), Status3 = sys:get_status(GlobalName1), {status,Pid3,_Mod,[_PDict3,running,_,_,Data3]} = Status3, [format_status_called|_] = lists:reverse(Data3), stop_it(Pid3), GlobalName2 = {global,{name, "term"}}, {ok,Pid4} = gen_statem:start( GlobalName2, ?MODULE, start_arg(Config, []), []), Status4 = sys:get_status(GlobalName2), {status,Pid4,_Mod,[_PDict4,running,_,_, Data4]} = Status4, [format_status_called|_] = lists:reverse(Data4), stop_it(Pid4), %% check that format_status can handle a name being a term other than a %% pid or atom dummy_via:reset(), ViaName1 = {via,dummy_via,"CallFormatStatus"}, {ok,Pid5} = gen_statem:start(ViaName1, ?MODULE, start_arg(Config, []), []), Status5 = sys:get_status(ViaName1), {status,Pid5,_Mod, [_PDict5,running,_,_, Data5]} = Status5, [format_status_called|_] = lists:reverse(Data5), stop_it(Pid5), ViaName2 = {via,dummy_via,{name,"term"}}, {ok, Pid6} = gen_statem:start( ViaName2, ?MODULE, start_arg(Config, []), []), Status6 = sys:get_status(ViaName2), {status,Pid6,_Mod,[_PDict6,running,_,_,Data6]} = Status6, [format_status_called|_] = lists:reverse(Data6), stop_it(Pid6). error_format_status(Config) -> error_logger_forwarder:register(), OldFl = process_flag(trap_exit, true), Data = "called format_status", {ok,Pid} = gen_statem:start( ?MODULE, start_arg(Config, {data,Data}), []), %% bad return value in the gen_statem loop {{bad_return_from_state_function,badreturn},_} = ?EXPECT_FAILURE(gen_statem:call(Pid, badreturn), Reason), receive {error,_, {Pid, "** State machine"++_, [Pid,{{call,_},badreturn}, {formatted,idle,Data}, error,{bad_return_from_state_function,badreturn}|_]}} -> ok; Other when is_tuple(Other), element(1, Other) =:= error -> error_logger_forwarder:unregister(), ct:fail({unexpected,Other}) after 1000 -> error_logger_forwarder:unregister(), ct:fail(timeout) end, process_flag(trap_exit, OldFl), error_logger_forwarder:unregister(), receive %% Comes with SASL {error_report,_,{Pid,crash_report,_}} -> ok after 500 -> ok end, ok = verify_empty_msgq(). terminate_crash_format(Config) -> error_logger_forwarder:register(), OldFl = process_flag(trap_exit, true), Data = crash_terminate, {ok,Pid} = gen_statem:start( ?MODULE, start_arg(Config, {data,Data}), []), stop_it(Pid), Self = self(), receive {error,_GroupLeader, {Pid, "** State machine"++_, [Pid, {{call,{Self,_}},stop}, {formatted,idle,Data}, exit,{crash,terminate}|_]}} -> ok; Other when is_tuple(Other), element(1, Other) =:= error -> error_logger_forwarder:unregister(), ct:fail({unexpected,Other}) after 1000 -> error_logger_forwarder:unregister(), ct:fail(timeout) end, process_flag(trap_exit, OldFl), error_logger_forwarder:unregister(), receive %% Comes with SASL {error_report,_,{Pid,crash_report,_}} -> ok after 500 -> ok end, ok = verify_empty_msgq(). get_state(Config) -> State = self(), {ok,Pid} = gen_statem:start( ?MODULE, start_arg(Config, {data,State}), []), {idle,State} = sys:get_state(Pid), {idle,State} = sys:get_state(Pid, 5000), stop_it(Pid), %% check that get_state can handle a name being an atom (pid is %% already checked by the previous test) {ok,Pid2} = gen_statem:start( {local,gstm}, ?MODULE, start_arg(Config, {data,State}), []), {idle,State} = sys:get_state(gstm), {idle,State} = sys:get_state(gstm, 5000), stop_it(Pid2), %% check that get_state works when pid is sys suspended {ok,Pid3} = gen_statem:start( ?MODULE, start_arg(Config, {data,State}), []), {idle,State} = sys:get_state(Pid3), ok = sys:suspend(Pid3), {idle,State} = sys:get_state(Pid3, 5000), ok = sys:resume(Pid3), stop_it(Pid3), ok = verify_empty_msgq(). replace_state(Config) -> State = self(), {ok, Pid} = gen_statem:start( ?MODULE, start_arg(Config, {data,State}), []), {idle,State} = sys:get_state(Pid), NState1 = "replaced", Replace1 = fun({StateName, _}) -> {StateName,NState1} end, {idle,NState1} = sys:replace_state(Pid, Replace1), {idle,NState1} = sys:get_state(Pid), NState2 = "replaced again", Replace2 = fun({idle, _}) -> {state0,NState2} end, {state0,NState2} = sys:replace_state(Pid, Replace2, 5000), {state0,NState2} = sys:get_state(Pid), %% verify no change in state if replace function crashes Replace3 = fun(_) -> error(fail) end, {callback_failed, {gen_statem,system_replace_state},{error,fail}} = ?EXPECT_FAILURE(sys:replace_state(Pid, Replace3), Reason), {state0, NState2} = sys:get_state(Pid), %% verify state replaced if process sys suspended ok = sys:suspend(Pid), Suffix2 = " and again", NState3 = NState2 ++ Suffix2, Replace4 = fun({StateName, _}) -> {StateName, NState3} end, {state0,NState3} = sys:replace_state(Pid, Replace4), ok = sys:resume(Pid), {state0,NState3} = sys:get_state(Pid, 5000), stop_it(Pid), ok = verify_empty_msgq(). %% Hibernation hibernate(Config) -> OldFl = process_flag(trap_exit, true), {ok,Pid0} = gen_statem:start_link( ?MODULE, start_arg(Config, hiber_now), []), is_in_erlang_hibernate(Pid0), stop_it(Pid0), receive {'EXIT',Pid0,normal} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, {ok,Pid} = gen_statem:start_link(?MODULE, start_arg(Config, hiber), []), true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid,current_function)), hibernating = gen_statem:call(Pid, hibernate_sync), is_in_erlang_hibernate(Pid), good_morning = gen_statem:call(Pid, wakeup_sync), is_not_in_erlang_hibernate(Pid), hibernating = gen_statem:call(Pid, hibernate_sync), is_in_erlang_hibernate(Pid), please_just_five_more = gen_statem:call(Pid, snooze_sync), is_in_erlang_hibernate(Pid), good_morning = gen_statem:call(Pid, wakeup_sync), is_not_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, hibernate_async), is_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, wakeup_async), is_not_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, hibernate_async), is_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, snooze_async), is_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, wakeup_async), is_not_in_erlang_hibernate(Pid), Pid ! hibernate_later, true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid, current_function)), is_in_erlang_hibernate(Pid), 'alive!' = gen_statem:call(Pid, 'alive?'), true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid, current_function)), Pid ! hibernate_now, is_in_erlang_hibernate(Pid), 'alive!' = gen_statem:call(Pid, 'alive?'), true = ({current_function,{erlang,hibernate,3}} =/= erlang:process_info(Pid, current_function)), hibernating = gen_statem:call(Pid, hibernate_sync), is_in_erlang_hibernate(Pid), good_morning = gen_statem:call(Pid, wakeup_sync), is_not_in_erlang_hibernate(Pid), hibernating = gen_statem:call(Pid, hibernate_sync), is_in_erlang_hibernate(Pid), please_just_five_more = gen_statem:call(Pid, snooze_sync), is_in_erlang_hibernate(Pid), good_morning = gen_statem:call(Pid, wakeup_sync), is_not_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, hibernate_async), is_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, wakeup_async), is_not_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, hibernate_async), is_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, snooze_async), is_in_erlang_hibernate(Pid), ok = gen_statem:cast(Pid, wakeup_async), is_not_in_erlang_hibernate(Pid), hibernating = gen_statem:call(Pid, hibernate_sync), is_in_erlang_hibernate(Pid), sys:suspend(Pid), is_in_erlang_hibernate(Pid), sys:resume(Pid), is_in_erlang_hibernate(Pid), receive after 1000 -> ok end, is_in_erlang_hibernate(Pid), good_morning = gen_statem:call(Pid, wakeup_sync), is_not_in_erlang_hibernate(Pid), stop_it(Pid), process_flag(trap_exit, OldFl), receive {'EXIT',Pid,normal} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, ok = verify_empty_msgq(). is_in_erlang_hibernate(Pid) -> receive after 1 -> ok end, is_in_erlang_hibernate_1(200, Pid). is_in_erlang_hibernate_1(0, Pid) -> ct:log("~p\n", [erlang:process_info(Pid, current_function)]), ct:fail(not_in_erlang_hibernate_3); is_in_erlang_hibernate_1(N, Pid) -> {current_function,MFA} = erlang:process_info(Pid, current_function), case MFA of {erlang,hibernate,3} -> ok; _ -> receive after 10 -> ok end, is_in_erlang_hibernate_1(N-1, Pid) end. is_not_in_erlang_hibernate(Pid) -> receive after 1 -> ok end, is_not_in_erlang_hibernate_1(200, Pid). is_not_in_erlang_hibernate_1(0, Pid) -> ct:log("~p\n", [erlang:process_info(Pid, current_function)]), ct:fail(not_in_erlang_hibernate_3); is_not_in_erlang_hibernate_1(N, Pid) -> {current_function,MFA} = erlang:process_info(Pid, current_function), case MFA of {erlang,hibernate,3} -> receive after 10 -> ok end, is_not_in_erlang_hibernate_1(N-1, Pid); _ -> ok end. enter_loop(_Config) -> OldFlag = process_flag(trap_exit, true), dummy_via:reset(), %% Locally registered process + {local,Name} {ok,Pid1a} = proc_lib:start_link(?MODULE, enter_loop, [local,local]), yes = gen_statem:call(Pid1a, 'alive?'), stopped = gen_statem:call(Pid1a, stop), receive {'EXIT',Pid1a,normal} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, %% Unregistered process + {local,Name} {ok,Pid1b} = proc_lib:start_link(?MODULE, enter_loop, [anon,local]), receive {'EXIT',Pid1b,process_not_registered} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, %% Globally registered process + {global,Name} {ok,Pid2a} = proc_lib:start_link(?MODULE, enter_loop, [global,global]), yes = gen_statem:call(Pid2a, 'alive?'), stopped = gen_statem:call(Pid2a, stop), receive {'EXIT',Pid2a,normal} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, %% Unregistered process + {global,Name} {ok,Pid2b} = proc_lib:start_link(?MODULE, enter_loop, [anon,global]), receive {'EXIT',Pid2b,process_not_registered_globally} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, %% Unregistered process + no name {ok,Pid3} = proc_lib:start_link(?MODULE, enter_loop, [anon,anon]), yes = gen_statem:call(Pid3, 'alive?'), stopped = gen_statem:call(Pid3, stop), receive {'EXIT',Pid3,normal} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, %% Process not started using proc_lib Pid4 = spawn_link(gen_statem, enter_loop, [?MODULE,[],state0,[]]), receive {'EXIT',Pid4,process_was_not_started_by_proc_lib} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, %% Make sure I am the parent, ie that ordering a shutdown will %% result in the process terminating with Reason==shutdown {ok,Pid5} = proc_lib:start_link(?MODULE, enter_loop, [anon,anon]), yes = gen_statem:call(Pid5, 'alive?'), exit(Pid5, shutdown), receive {'EXIT',Pid5,shutdown} -> ok after 5000 -> ct:fail(gen_statem_did_not_die) end, %% Make sure gen_statem:enter_loop does not accept {local,Name} %% when it's another process than the calling one which is %% registered under that name register(armitage, self()), {ok,Pid6a} = proc_lib:start_link(?MODULE, enter_loop, [anon,local]), receive {'EXIT',Pid6a,process_not_registered} -> ok after 1000 -> ct:fail(gen_statem_started) end, unregister(armitage), %% Make sure gen_statem:enter_loop does not accept {global,Name} %% when it's another process than the calling one which is %% registered under that name global:register_name(armitage, self()), {ok,Pid6b} = proc_lib:start_link(?MODULE, enter_loop, [anon,global]), receive {'EXIT',Pid6b,process_not_registered_globally} -> ok after 1000 -> ct:fail(gen_statem_started) end, global:unregister_name(armitage), dummy_via:register_name(armitage, self()), {ok,Pid6c} = proc_lib:start_link(?MODULE, enter_loop, [anon,via]), receive {'EXIT',Pid6c,{process_not_registered_via,dummy_via}} -> ok after 1000 -> ct:fail( {gen_statem_started, process_info(self(), messages)}) end, dummy_via:unregister_name(armitage), process_flag(trap_exit, OldFlag), ok = verify_empty_msgq(). enter_loop(Reg1, Reg2) -> process_flag(trap_exit, true), case Reg1 of local -> register(armitage, self()); global -> global:register_name(armitage, self()); via -> dummy_via:register_name(armitage, self()); anon -> ignore end, proc_lib:init_ack({ok, self()}), case Reg2 of local -> gen_statem:enter_loop( ?MODULE, [], state0, [], {local,armitage}); global -> gen_statem:enter_loop( ?MODULE, [], state0, [], {global,armitage}); via -> gen_statem:enter_loop( ?MODULE, [], state0, [], {via, dummy_via, armitage}); anon -> gen_statem:enter_loop(?MODULE, [], state0, []) end. %% Test the order for multiple {next_event,T,C} next_events(Config) -> {ok,Pid} = gen_statem:start(?MODULE, start_arg(Config, []), []), ok = gen_statem:cast(Pid, next_event), {state,next_events,[]} = gen_statem:call(Pid, get), ok = gen_statem:stop(Pid), false = erlang:is_process_alive(Pid), noproc = ?EXPECT_FAILURE(gen_statem:stop(Pid), Reason). %% %% Functionality check %% wfor(Msg) -> receive Msg -> ok after 5000 -> error(timeout) end. stop_it(STM) -> stopped = gen_statem:call(STM, stop), check_stopped(STM). check_stopped(STM) -> Call = there_you_are, {_,{gen_statem,call,[_,Call,infinity]}} = ?EXPECT_FAILURE(gen_statem:call(STM, Call), Reason), ok. do_func_test(STM) -> ok = gen_statem:cast(STM, {'alive?',self()}), wfor(yes), ok = do_connect(STM), ok = gen_statem:cast(STM, {'alive?',self()}), wfor(yes), ?t:do_times(3, ?MODULE, do_msg, [STM]), ok = gen_statem:cast(STM, {'alive?',self()}), wfor(yes), ok = do_disconnect(STM), ok = gen_statem:cast(STM, {'alive?',self()}), wfor(yes), ok. do_connect(STM) -> check_state(STM, idle), gen_statem:cast(STM, {connect,self()}), wfor(accept), check_state(STM, wfor_conf), Tag = make_ref(), gen_statem:cast(STM, {ping,self(),Tag}), gen_statem:cast(STM, confirm), wfor({pong,Tag}), check_state(STM, connected), ok. do_msg(STM) -> check_state(STM, connected), R = make_ref(), ok = gen_statem:cast(STM, {msg,self(),R}), wfor({ack,R}). do_disconnect(STM) -> ok = gen_statem:cast(STM, disconnect), check_state(STM, idle). check_state(STM, State) -> case gen_statem:call(STM, get) of {state, State, _} -> ok end. do_sync_func_test(STM) -> yes = gen_statem:call(STM, 'alive?'), ok = do_sync_connect(STM), yes = gen_statem:call(STM, 'alive?'), ?t:do_times(3, ?MODULE, do_sync_msg, [STM]), yes = gen_statem:call(STM, 'alive?'), ok = do_sync_disconnect(STM), yes = gen_statem:call(STM, 'alive?'), check_state(STM, idle), ok = gen_statem:call(STM, {timeout,200}), yes = gen_statem:call(STM, 'alive?'), check_state(STM, idle), ok. do_sync_connect(STM) -> check_state(STM, idle), accept = gen_statem:call(STM, connect), check_state(STM, wfor_conf), Tag = make_ref(), gen_statem:cast(STM, {ping,self(),Tag}), yes = gen_statem:call(STM, confirm), wfor({pong,Tag}), check_state(STM, connected), ok. do_sync_msg(STM) -> check_state(STM, connected), R = make_ref(), {ack,R} = gen_statem:call(STM, {msg,R}), ok. do_sync_disconnect(STM) -> yes = gen_statem:call(STM, disconnect), check_state(STM, idle). verify_empty_msgq() -> [] = flush(), ok. start_arg(Config, Arg) -> case lists:keyfind(callback_mode, 1, Config) of {_,CallbackMode} -> {callback_mode,CallbackMode,Arg}; false -> Arg end. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% %% The State Machine %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% init(ignore) -> ignore; init(stop) -> {stop,stopped}; init(stop_shutdown) -> {stop,shutdown}; init(sleep) -> ?t:sleep(1000), {ok,idle,data}; init(hiber) -> {ok,hiber_idle,[]}; init(hiber_now) -> {ok,hiber_idle,[],[hibernate]}; init({data, Data}) -> {ok,idle,Data}; init({callback_mode,CallbackMode,Arg}) -> ets:new(?MODULE, [named_table,private]), ets:insert(?MODULE, {callback_mode,CallbackMode}), init(Arg); init({map_statem,#{init := Init}=Machine,Modes}) -> ets:new(?MODULE, [named_table,private]), ets:insert(?MODULE, {callback_mode,[handle_event_function|Modes]}), case Init() of {ok,State,Data,Ops} -> {ok,State,[Data|Machine],Ops}; {ok,State,Data} -> {ok,State,[Data|Machine]}; Other -> Other end; init([]) -> {ok,idle,data}. callback_mode() -> try ets:lookup(?MODULE, callback_mode) of [{callback_mode,CallbackMode}] -> CallbackMode catch error:badarg -> state_functions end. terminate(_, _State, crash_terminate) -> exit({crash,terminate}); terminate({From,stopped}, State, _Data) -> From ! {self(),{stopped,State}}, ok; terminate(_Reason, _State, _Data) -> ok. %% State functions idle(cast, {connect,Pid}, Data) -> Pid ! accept, {next_state,wfor_conf,Data,infinity}; % NoOp timeout just to test API idle({call,From}, connect, Data) -> gen_statem:reply(From, accept), {next_state,wfor_conf,Data,infinity}; % NoOp timeout just to test API idle(cast, badreturn, _Data) -> badreturn; idle({call,_From}, badreturn, _Data) -> badreturn; idle({call,From}, {delayed_answer,T}, Data) -> receive after T -> gen_statem:reply({reply,From,delayed}), throw({keep_state,Data}) end; idle({call,From}, {timeout,Time}, _Data) -> {next_state,timeout,{From,Time}, {timeout,Time,idle}}; idle(cast, next_event, _Data) -> {next_state,next_events,[a,b,c], [{next_event,internal,a}, {next_event,internal,b}, {next_event,internal,c}]}; idle(Type, Content, Data) -> case handle_common_events(Type, Content, idle, Data) of undefined -> case Type of {call,From} -> throw({keep_state,Data,[{reply,From,'eh?'}]}); _ -> throw( {stop,{unexpected,idle,Type,Content}}) end; Result -> Result end. timeout(timeout, idle, {From,Time}) -> TRef = erlang:start_timer(Time, self(), ok), {keep_state,{From,TRef},0}; % Immediate timeout 0 timeout(timeout, 0, {From,TRef}) -> {next_state,timeout2,{From,TRef}, [{timeout,1,should_be_cancelled}, postpone]}; % Should cancel state timeout timeout(_, _, _) -> keep_state_and_data. timeout2(timeout, 0, _) -> keep_state_and_data; timeout2(timeout, Reason, _) -> {stop,Reason}; timeout2(info, {timeout,TRef,Result}, {From,TRef}) -> gen_statem:reply([{reply,From,Result}]), {next_state,idle,state}; timeout2(_, _, _) -> {keep_state_and_data,[]}. wfor_conf({call,From}, confirm, Data) -> {next_state,connected,Data, {reply,From,yes}}; wfor_conf(cast, {ping,_,_}, _) -> {keep_state_and_data,[postpone]}; wfor_conf(cast, confirm, Data) -> {next_state,connected,Data}; wfor_conf(Type, Content, Data) -> case handle_common_events(Type, Content, wfor_conf, Data) of undefined -> case Type of {call,From} -> {next_state,idle,Data, [{reply,From,'eh?'}]}; _ -> throw(keep_state_and_data) end; Result -> Result end. connected({call,From}, {msg,Ref}, Data) -> {keep_state,Data, {reply,From,{ack,Ref}}}; connected(cast, {msg,From,Ref}, Data) -> From ! {ack,Ref}, {keep_state,Data}; connected({call,From}, disconnect, Data) -> {next_state,idle,Data, [{reply,From,yes}]}; connected(cast, disconnect, Data) -> {next_state,idle,Data}; connected(cast, {ping,Pid,Tag}, Data) -> Pid ! {pong,Tag}, {keep_state,Data}; connected(Type, Content, Data) -> case handle_common_events(Type, Content, connected, Data) of undefined -> case Type of {call,From} -> {keep_state,Data, [{reply,From,'eh?'}]}; _ -> {keep_state,Data} end; Result -> Result end. state0({call,From}, stop, Data) -> {stop_and_reply,normal,[{reply,From,stopped}],Data}; state0(Type, Content, Data) -> case handle_common_events(Type, Content, state0, Data) of undefined -> {keep_state,Data}; Result -> Result end. hiber_idle({call,From}, 'alive?', Data) -> {keep_state,Data, [{reply,From,'alive!'}]}; hiber_idle({call,From}, hibernate_sync, Data) -> {next_state,hiber_wakeup,Data, [{reply,From,hibernating}, hibernate]}; hiber_idle(info, hibernate_later, _) -> Tref = erlang:start_timer(1000, self(), hibernate), {keep_state,Tref}; hiber_idle(info, hibernate_now, Data) -> {keep_state,Data, [hibernate]}; hiber_idle(info, {timeout,Tref,hibernate}, Tref) -> {keep_state,[], [hibernate]}; hiber_idle(cast, hibernate_async, Data) -> {next_state,hiber_wakeup,Data, [hibernate]}; hiber_idle(Type, Content, Data) -> case handle_common_events(Type, Content, hiber_idle, Data) of undefined -> {keep_state,Data}; Result -> Result end. hiber_wakeup({call,From}, wakeup_sync, Data) -> {next_state,hiber_idle,Data, [{reply,From,good_morning}]}; hiber_wakeup({call,From}, snooze_sync, Data) -> {keep_state,Data, [{reply,From,please_just_five_more}, hibernate]}; hiber_wakeup(cast, wakeup_async, Data) -> {next_state,hiber_idle,Data}; hiber_wakeup(cast, snooze_async, Data) -> {keep_state,Data, [hibernate]}; hiber_wakeup(Type, Content, Data) -> case handle_common_events(Type, Content, hiber_wakeup, Data) of undefined -> {keep_state,Data}; Result -> Result end. next_events(internal, Msg, [Msg|Msgs]) -> {keep_state,Msgs}; next_events(Type, Content, Data) -> case handle_common_events(Type, Content, next_events, Data) of undefined -> {keep_state,Data}; Result -> Result end. handle_common_events({call,From}, get_callback_mode, _, _) -> {keep_state_and_data,{reply,From,state_functions}}; handle_common_events({call,From}, get, State, Data) -> {keep_state,Data, [{reply,From,{state,State,Data}}]}; handle_common_events(cast, {get,Pid}, State, Data) -> Pid ! {state,State,Data}, {keep_state,Data}; handle_common_events({call,From}, stop, _, Data) -> {stop_and_reply,normal,[{reply,From,stopped}],Data}; handle_common_events(cast, stop, _, _) -> stop; handle_common_events({call,From}, {stop,Reason}, _, Data) -> {stop_and_reply,Reason,{reply,From,stopped},Data}; handle_common_events(cast, {stop,Reason}, _, _) -> {stop,Reason}; handle_common_events({call,From}, 'alive?', _, Data) -> {keep_state,Data, [{reply,From,yes}]}; handle_common_events(cast, {'alive?',Pid}, _, Data) -> Pid ! yes, {keep_state,Data}; handle_common_events(_, _, _, _) -> undefined. handle_event({call,From}, get_callback_mode, _, _) -> {keep_state_and_data,{reply,From,handle_event_function}}; %% Wrapper state machine that uses a map state machine spec handle_event( Type, Event, State, [Data|Machine]) when is_map(Machine) -> #{State := HandleEvent} = Machine, case try HandleEvent(Type, Event, Data) of Result -> Result catch Result -> Result end of {stop,Reason,NewData} -> {stop,Reason,[NewData|Machine]}; {next_state,NewState,NewData} -> {next_state,NewState,[NewData|Machine]}; {next_state,NewState,NewData,Ops} -> {next_state,NewState,[NewData|Machine],Ops}; {keep_state,NewData} -> {keep_state,[NewData|Machine]}; {keep_state,NewData,Ops} -> {keep_state,[NewData|Machine],Ops}; Other -> Other end; %% %% Dispatcher to test callback_mode handle_event_function %% %% Wrap the state in a 1 element list just to test non-atom %% states. Note that the state from init/1 is not wrapped %% so both atom and non-atom states are tested. handle_event(Type, Event, State, Data) -> StateName = unwrap_state(State), try ?MODULE:StateName(Type, Event, Data) of Result -> wrap_result(Result) catch throw:Result -> erlang:raise( throw, wrap_result(Result), erlang:get_stacktrace()) end. unwrap_state([State]) -> State; unwrap_state(State) -> State. wrap_result(Result) -> case Result of {next_state,NewState,NewData} -> {next_state,[NewState],NewData}; {next_state,NewState,NewData,StateOps} -> {next_state,[NewState],NewData,StateOps}; Other -> Other end. code_change(OldVsn, State, Data, CallbackMode) -> io:format( "code_change(~p, ~p, ~p, ~p)~n", [OldVsn,State,Data,CallbackMode]), ets:insert(?MODULE, {callback_mode,CallbackMode}), io:format( "code_change(~p, ~p, ~p, ~p)~n", [OldVsn,State,Data,CallbackMode]), {ok,State,{OldVsn,Data,CallbackMode}}. format_status(terminate, [_Pdict,State,Data]) -> {formatted,State,Data}; format_status(normal, [_Pdict,_State,_Data]) -> [format_status_called]. flush() -> receive Msg -> [Msg|flush()] after 500 -> [] end.