libs/msm/doc/HTML/examples/MsmComposite.cpp
// Copyright 2010 Christophe Henry // henry UNDERSCORE christophe AT hotmail DOT com // This is an extended version of the state machine available in the boost::mpl library // Distributed under the same license as the original. // Copyright for the original version: // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed // under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) #include <boost/msm/back/state_machine.hpp> #include <boost/msm/front/state_machine_def.hpp> namespace msm = boost::msm; namespace mpl = boost::mpl; #include <iostream> #ifdef WIN32 #include "windows.h" #else #include <sys/time.h> #endif namespace test_fsm // Concrete FSM implementation { // events struct play {}; struct end_pause {}; struct stop {}; struct pause {}; struct open_close {}; struct cd_detected{}; struct NextSong {}; struct PreviousSong {}; // Concrete FSM implementation struct player_ : public msm::front::state_machine_def<player_> { // no need for exception handling or message queue typedef int no_exception_thrown; typedef int no_message_queue; // The list of FSM states struct Empty : public msm::front::state<> { // optional entry/exit methods template <class Event,class FSM> void on_entry(Event const&,FSM& ) {/*std::cout << "entering: Empty" << std::endl;*/} template <class Event,class FSM> void on_exit(Event const&,FSM& ) {/*std::cout << "leaving: Empty" << std::endl;*/} }; struct Open : public msm::front::state<> { template <class Event,class FSM> void on_entry(Event const&,FSM& ) {/*std::cout << "entering: Open" << std::endl;*/} template <class Event,class FSM> void on_exit(Event const&,FSM& ) {/*std::cout << "leaving: Open" << std::endl;*/} }; struct Stopped : public msm::front::state<> { // when stopped, the CD is loaded template <class Event,class FSM> void on_entry(Event const&,FSM& ) {/*std::cout << "entering: Stopped" << std::endl;*/} template <class Event,class FSM> void on_exit(Event const&,FSM& ) {/*std::cout << "leaving: Stopped" << std::endl;*/} }; struct Playing_ : public msm::front::state_machine_def<Playing_> { // no need for exception handling or message queue typedef int no_exception_thrown; typedef int no_message_queue; // The list of FSM states struct Song1 : public msm::front::state<> {}; struct Song2 : public msm::front::state<> {}; struct Song3 : public msm::front::state<> {}; // the initial state. Must be defined typedef Song1 initial_state; // transition actions void start_next_song(NextSong const&) { /*std::cout << "Playing::start_next_song\n";*/ } void start_prev_song(PreviousSong const&) { /*std::cout << "Playing::start_prev_song\n"; */} // guard conditions typedef Playing_ pl; // makes transition table cleaner // Transition table for Playing struct transition_table : mpl::vector4< // Start Event Next Action Guard // +---------+-------------+---------+---------------------+----------------------+ a_row < Song1 , NextSong , Song2 , &pl::start_next_song >, a_row < Song2 , PreviousSong, Song1 , &pl::start_prev_song >, a_row < Song2 , NextSong , Song3 , &pl::start_next_song >, a_row < Song3 , PreviousSong, Song2 , &pl::start_prev_song > // +---------+-------------+---------+---------------------+----------------------+ > {}; // Replaces the default no-transition response. template <class FSM,class Event> void no_transition(Event const& e, FSM&,int state) { std::cout << "no transition from state " << state << " on event " << typeid(e).name() << std::endl; } }; typedef msm::back::state_machine<Playing_> Playing; // state not defining any entry or exit struct Paused : public msm::front::state<> { template <class Event,class FSM> void on_entry(Event const&,FSM& ) {/*std::cout << "entering: Paused" << std::endl;*/} template <class Event,class FSM> void on_exit(Event const&,FSM& ) {/*std::cout << "leaving: Paused" << std::endl;*/} }; // the initial state of the player SM. Must be defined typedef Empty initial_state; // transition actions void start_playback(play const&) { } void open_drawer(open_close const&) { } void close_drawer(open_close const&) { } void store_cd_info(cd_detected const& cd) { } void stop_playback(stop const&) { } void pause_playback(pause const&) { } void resume_playback(end_pause const&) { } void stop_and_open(open_close const&) { } void stopped_again(stop const&){} // guard conditions typedef player_ p; // makes transition table cleaner // Transition table for player struct transition_table : mpl::vector< // Start Event Next Action Guard // +---------+-------------+---------+---------------------+----------------------+ a_row < Stopped , play , Playing , &p::start_playback >, a_row < Stopped , open_close , Open , &p::open_drawer >, a_row < Stopped , stop , Stopped , &p::stopped_again >, // +---------+-------------+---------+---------------------+----------------------+ a_row < Open , open_close , Empty , &p::close_drawer >, // +---------+-------------+---------+---------------------+----------------------+ a_row < Empty , open_close , Open , &p::open_drawer >, a_row < Empty , cd_detected , Stopped , &p::store_cd_info >, // +---------+-------------+---------+---------------------+----------------------+ a_row < Playing , stop , Stopped , &p::stop_playback >, a_row < Playing , pause , Paused , &p::pause_playback >, a_row < Playing , open_close , Open , &p::stop_and_open >, // +---------+-------------+---------+---------------------+----------------------+ a_row < Paused , end_pause , Playing , &p::resume_playback >, a_row < Paused , stop , Stopped , &p::stop_playback >, a_row < Paused , open_close , Open , &p::stop_and_open > // +---------+-------------+---------+---------------------+----------------------+ > {}; // Replaces the default no-transition response. template <class FSM,class Event> void no_transition(Event const& e, FSM&,int state) { std::cout << "no transition from state " << state << " on event " << typeid(e).name() << std::endl; } }; typedef msm::back::state_machine<player_> player; // // Testing utilities. // static char const* const state_names[] = { "Stopped", "Open", "Empty", "Playing", "Paused" }; void pstate(player const& p) { std::cout << " -> " << state_names[p.current_state()[0]] << std::endl; } } #ifndef WIN32 long mtime(struct timeval& tv1,struct timeval& tv2) { return (tv2.tv_sec-tv1.tv_sec) *1000000 + ((tv2.tv_usec-tv1.tv_usec)); } #endif int main() { // for timing #ifdef WIN32 LARGE_INTEGER res; ::QueryPerformanceFrequency(&res); LARGE_INTEGER li,li2; #else struct timeval tv1,tv2; gettimeofday(&tv1,NULL); #endif test_fsm::player p2; p2.start(); // for timing #ifdef WIN32 ::QueryPerformanceCounter(&li); #else gettimeofday(&tv1,NULL); #endif for (int i=0;i<100;++i) { p2.process_event(test_fsm::open_close()); p2.process_event(test_fsm::open_close()); p2.process_event(test_fsm::cd_detected()); p2.process_event(test_fsm::play()); for (int j=0;j<100;++j) { p2.process_event(test_fsm::NextSong()); p2.process_event(test_fsm::NextSong()); p2.process_event(test_fsm::PreviousSong()); p2.process_event(test_fsm::PreviousSong()); } p2.process_event(test_fsm::pause()); // go back to Playing p2.process_event(test_fsm::end_pause()); p2.process_event(test_fsm::pause()); p2.process_event(test_fsm::stop()); // event leading to the same state p2.process_event(test_fsm::stop()); p2.process_event(test_fsm::open_close()); p2.process_event(test_fsm::open_close()); } #ifdef WIN32 ::QueryPerformanceCounter(&li2); #else gettimeofday(&tv2,NULL); #endif #ifdef WIN32 std::cout << "msm took in s:" << (double)(li2.QuadPart-li.QuadPart)/res.QuadPart <<"\n" <<std::endl; #else std::cout << "msm took in us:" << mtime(tv1,tv2) <<"\n" <<std::endl; #endif return 0; }