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- // 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 <iostream>
- // back-end
- #include <boost/msm/back/state_machine.hpp>
- //front-end
- #include <boost/msm/front/state_machine_def.hpp>
- #ifndef BOOST_MSM_NONSTANDALONE_TEST
- #define BOOST_TEST_MODULE MyTest
- #endif
- #include <boost/test/unit_test.hpp>
- namespace msm = boost::msm;
- namespace mpl = boost::mpl;
- namespace
- {
- // events
- struct play {};
- struct end_pause {};
- struct stop {};
- struct pause {};
- struct open_close {};
- // A "complicated" event type that carries some data.
- enum DiskTypeEnum
- {
- DISK_CD=0,
- DISK_DVD=1
- };
- struct cd_detected
- {
- cd_detected(std::string name, DiskTypeEnum diskType)
- : name(name),
- disc_type(diskType)
- {}
- std::string name;
- DiskTypeEnum disc_type;
- };
- // front-end: define the FSM structure
- struct player_ : public msm::front::state_machine_def<player_>
- {
- unsigned int start_playback_counter;
- unsigned int can_close_drawer_counter;
- player_():
- start_playback_counter(0),
- can_close_drawer_counter(0)
- {}
- // The list of FSM states
- struct Empty : public msm::front::state<>
- {
- template <class Event,class FSM>
- void on_entry(Event const&,FSM& ) {++entry_counter;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {++exit_counter;}
- int entry_counter;
- int exit_counter;
- };
- struct Open : public msm::front::state<>
- {
- template <class Event,class FSM>
- void on_entry(Event const&,FSM& ) {++entry_counter;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {++exit_counter;}
- int entry_counter;
- int exit_counter;
- };
- // sm_ptr still supported but deprecated as functors are a much better way to do the same thing
- struct Stopped : public msm::front::state<>
- {
- template <class Event,class FSM>
- void on_entry(Event const&,FSM& ) {++entry_counter;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {++exit_counter;}
- int entry_counter;
- int exit_counter;
- };
- struct Playing : public msm::front::state<>
- {
- template <class Event,class FSM>
- void on_entry(Event const&,FSM& ) {++entry_counter;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {++exit_counter;}
- int entry_counter;
- int exit_counter;
- };
- // state not defining any entry or exit
- struct Paused : public msm::front::state<>
- {
- template <class Event,class FSM>
- void on_entry(Event const&,FSM& ) {++entry_counter;}
- template <class Event,class FSM>
- void on_exit(Event const&,FSM& ) {++exit_counter;}
- int entry_counter;
- int exit_counter;
- };
- // the initial state of the player SM. Must be defined
- typedef Empty initial_state;
- // transition actions
- void start_playback(play const&) {++start_playback_counter; }
- void open_drawer(open_close const&) { }
- void store_cd_info(cd_detected const&) { }
- 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
- bool good_disk_format(cd_detected const& evt)
- {
- // to test a guard condition, let's say we understand only CDs, not DVD
- if (evt.disc_type != DISK_CD)
- {
- return false;
- }
- return true;
- }
- bool can_close_drawer(open_close const&)
- {
- ++can_close_drawer_counter;
- return true;
- }
- 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 >,
- _row < Stopped , stop , Stopped >,
- // +---------+-------------+---------+---------------------+----------------------+
- g_row < Open , open_close , Empty , &p::can_close_drawer >,
- // +---------+-------------+---------+---------------------+----------------------+
- a_row < Empty , open_close , Open , &p::open_drawer >,
- row < Empty , cd_detected , Stopped , &p::store_cd_info ,&p::good_disk_format >,
- // +---------+-------------+---------+---------------------+----------------------+
- 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& , FSM&,int)
- {
- BOOST_FAIL("no_transition called!");
- }
- // init counters
- template <class Event,class FSM>
- void on_entry(Event const&,FSM& fsm)
- {
- fsm.template get_state<player_::Stopped&>().entry_counter=0;
- fsm.template get_state<player_::Stopped&>().exit_counter=0;
- fsm.template get_state<player_::Open&>().entry_counter=0;
- fsm.template get_state<player_::Open&>().exit_counter=0;
- fsm.template get_state<player_::Empty&>().entry_counter=0;
- fsm.template get_state<player_::Empty&>().exit_counter=0;
- fsm.template get_state<player_::Playing&>().entry_counter=0;
- fsm.template get_state<player_::Playing&>().exit_counter=0;
- fsm.template get_state<player_::Paused&>().entry_counter=0;
- fsm.template get_state<player_::Paused&>().exit_counter=0;
- }
- };
- // Pick a back-end
- typedef msm::back::state_machine<player_> player;
- // static char const* const state_names[] = { "Stopped", "Open", "Empty", "Playing", "Paused" };
- BOOST_AUTO_TEST_CASE( my_test )
- {
- player p;
- p.start();
- BOOST_CHECK_MESSAGE(p.get_state<player_::Empty&>().entry_counter == 1,"Empty entry not called correctly");
- p.process_event(open_close());
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 1,"Open should be active"); //Open
- BOOST_CHECK_MESSAGE(p.get_state<player_::Empty&>().exit_counter == 1,"Empty exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Open&>().entry_counter == 1,"Open entry not called correctly");
- p.process_event(open_close());
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 2,"Empty should be active"); //Empty
- BOOST_CHECK_MESSAGE(p.get_state<player_::Open&>().exit_counter == 1,"Open exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Empty&>().entry_counter == 2,"Empty entry not called correctly");
- BOOST_CHECK_MESSAGE(p.can_close_drawer_counter == 1,"guard not called correctly");
- p.process_event(
- cd_detected("louie, louie",DISK_DVD));
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 2,"Empty should be active"); //Empty
- BOOST_CHECK_MESSAGE(p.get_state<player_::Open&>().exit_counter == 1,"Open exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Empty&>().entry_counter == 2,"Empty entry not called correctly");
- p.process_event(
- cd_detected("louie, louie",DISK_CD));
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 0,"Stopped should be active"); //Stopped
- BOOST_CHECK_MESSAGE(p.get_state<player_::Empty&>().exit_counter == 2,"Empty exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Stopped&>().entry_counter == 1,"Stopped entry not called correctly");
- p.process_event(play());
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 3,"Playing should be active"); //Playing
- BOOST_CHECK_MESSAGE(p.get_state<player_::Stopped&>().exit_counter == 1,"Stopped exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Playing&>().entry_counter == 1,"Playing entry not called correctly");
- BOOST_CHECK_MESSAGE(p.start_playback_counter == 1,"action not called correctly");
- p.process_event(pause());
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 4,"Paused should be active"); //Paused
- BOOST_CHECK_MESSAGE(p.get_state<player_::Playing&>().exit_counter == 1,"Playing exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Paused&>().entry_counter == 1,"Paused entry not called correctly");
- // go back to Playing
- p.process_event(end_pause());
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 3,"Playing should be active"); //Playing
- BOOST_CHECK_MESSAGE(p.get_state<player_::Paused&>().exit_counter == 1,"Paused exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Playing&>().entry_counter == 2,"Playing entry not called correctly");
- p.process_event(pause());
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 4,"Paused should be active"); //Paused
- BOOST_CHECK_MESSAGE(p.get_state<player_::Playing&>().exit_counter == 2,"Playing exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Paused&>().entry_counter == 2,"Paused entry not called correctly");
- p.process_event(stop());
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 0,"Stopped should be active"); //Stopped
- BOOST_CHECK_MESSAGE(p.get_state<player_::Paused&>().exit_counter == 2,"Paused exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Stopped&>().entry_counter == 2,"Stopped entry not called correctly");
- p.process_event(stop());
- BOOST_CHECK_MESSAGE(p.current_state()[0] == 0,"Stopped should be active"); //Stopped
- BOOST_CHECK_MESSAGE(p.get_state<player_::Stopped&>().exit_counter == 2,"Stopped exit not called correctly");
- BOOST_CHECK_MESSAGE(p.get_state<player_::Stopped&>().entry_counter == 3,"Stopped entry not called correctly");
- }
- }
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