```erlang %%%------------------------------------------------------------------- %%% @author yujian %%% @doc %%%------------------------------------------------------------------- -module(test_fsm). -behaviour(gen_fsm). -export([start_link/0, init/1, handle_event/3, handle_sync_event/4, handle_info/3, terminate/3, code_change/4]). -export([send_event/1, role_login/2, role_logined/2, role_ping_role/2 ]). -define(SERVER, ?MODULE). -record(state, {}). start_link() -> gen_fsm:start_link({local, ?SERVER}, ?MODULE, [], []). init([]) -> io:format( "111:~n" ), {ok, role_login, #state{}}. handle_event(_Event, StateName, State) -> io:format( "222:~w~n", [[_Event, StateName, State]] ), {next_state, StateName, State}. handle_sync_event(_Event, _From, StateName, State) -> io:format( "333:~w~n", [[_Event, _From, StateName, State]] ), Reply = ok, {reply, Reply, StateName, State}. handle_info(_Info, StateName, State) -> io:format( "444:~w~n", [[_Info, StateName, State]] ), {next_state, StateName, State}. terminate(_Reason, _StateName, _State) -> io:format( "555:~w~n", [[_Reason, _StateName, _State]] ), ok. code_change(_OldVsn, StateName, State, _Extra) -> {ok, StateName, State}. role_login(_Event, State) -> io:format( "666:~w~n", [[_Event, State]] ), {next_state, role_logined, State}. role_logined(_Event, State) -> io:format( "777:~w~n", [ [_Event, State] ] ), {next_state, role_ping_role, State}. role_ping_role(_Event, State) -> io:format( "888:~w~n", [ [_Event, State] ] ), {next_state, role_ping_role, State}. send_event(Event) -> io:format( "999:~w~n", [Event] ), gen_fsm:send_event(?MODULE, Event).  ```