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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 <vector>
- #include <iostream>
- #include <boost/msm/back/state_machine.hpp>
- #include <boost/msm/front/euml/euml.hpp>
- using namespace std;
- using namespace boost::msm::front::euml;
- using namespace boost::msm::front;
- namespace msm = boost::msm;
- // entry/exit/action/guard logging functors
- #include "logging_functors.h"
- namespace // Concrete FSM implementation
- {
- // events
- // note that unlike the SimpleTutorial, events must derive from euml_event.
- BOOST_MSM_EUML_EVENT(play)
- BOOST_MSM_EUML_EVENT(end_pause)
- BOOST_MSM_EUML_EVENT(stop)
- BOOST_MSM_EUML_EVENT(pause)
- BOOST_MSM_EUML_EVENT(open_close)
- BOOST_MSM_EUML_EVENT(internal_event)
- BOOST_MSM_EUML_EVENT(next_song)
- BOOST_MSM_EUML_EVENT(previous_song)
- // A "complicated" event type that carries some data.
- BOOST_MSM_EUML_DECLARE_ATTRIBUTE(std::string,cd_name)
- BOOST_MSM_EUML_DECLARE_ATTRIBUTE(DiskTypeEnum,cd_type)
- BOOST_MSM_EUML_ATTRIBUTES((attributes_ << cd_name << cd_type ), cd_detected_attributes)
- BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES(cd_detected,cd_detected_attributes)
- // Concrete FSM implementation
- // The list of FSM states
- BOOST_MSM_EUML_STATE(( Empty_Entry,Empty_Exit ),Empty)
- // we just declare a state type but do not create any instance as we want to inherit from this type
- BOOST_MSM_EUML_DECLARE_STATE((Open_Entry,Open_Exit),Open_def)
- // derive to be able to add an internal transition table
- struct Open_impl : public Open_def
- {
- BOOST_MSM_EUML_DECLARE_INTERNAL_TRANSITION_TABLE((
- open_close [internal_guard1] / internal_action1 ,
- open_close [internal_guard2] / internal_action2 ,
- internal_event / internal_action
- ))
- };
- // declare an instance for the stt as we are manually declaring a state
- Open_impl const Open;
- BOOST_MSM_EUML_STATE(( Stopped_Entry,Stopped_Exit ),Stopped)
- // Playing is a state machine itself.
- // It has 3 substates
- BOOST_MSM_EUML_STATE(( Song1_Entry,Song1_Exit ),Song1)
- BOOST_MSM_EUML_STATE(( Song2_Entry,Song2_Exit ),Song2)
- BOOST_MSM_EUML_STATE(( Song3_Entry,Song3_Exit ),Song3)
- // Playing has a transition table
- BOOST_MSM_EUML_TRANSITION_TABLE((
- // +------------------------------------------------------------------------------+
- Song2 == Song1 + next_song / start_next_song,
- Song1 == Song2 + previous_song / start_prev_song,
- Song3 == Song2 + next_song / start_next_song,
- Song2 == Song3 + previous_song / start_prev_song
- // +------------------------------------------------------------------------------+
- ),playing_transition_table )
- BOOST_MSM_EUML_DECLARE_STATE_MACHINE( (playing_transition_table, //STT
- init_ << Song1 // Init State
- ),Playing_def)
- // some action for the internal transition
- BOOST_MSM_EUML_ACTION(playing_internal_action)
- {
- template <class FSM,class EVT,class SourceState,class TargetState>
- void operator()(EVT const&, FSM& ,SourceState& ,TargetState& )
- {
- cout << "Playing::internal action" << endl;
- }
- };
- // derive to be able to add an internal transition table
- struct Playing_ : public Playing_def
- {
- BOOST_MSM_EUML_DECLARE_INTERNAL_TRANSITION_TABLE((
- internal_event / playing_internal_action
- ))
- };
- // choice of back-end
- typedef msm::back::state_machine<Playing_> Playing_type;
- Playing_type const Playing;
- // state not needing any entry or exit
- BOOST_MSM_EUML_STATE((),Paused)
- // guard conditions
- BOOST_MSM_EUML_ACTION(good_disk_format)
- {
- template <class FSM,class EVT,class SourceState,class TargetState>
- bool operator()(EVT const& evt,FSM&,SourceState& ,TargetState& )
- {
- // to test a guard condition, let's say we understand only CDs, not DVD
- if (evt.get_attribute(cd_type)!=DISK_CD)
- {
- std::cout << "wrong disk, sorry" << std::endl;
- // just for logging, does not block any transition
- return true;
- }
- std::cout << "good disk" << std::endl;
- return true;
- }
- };
- // replaces the old transition table
- BOOST_MSM_EUML_TRANSITION_TABLE((
- Stopped + play / start_playback == Playing ,
- Stopped + open_close / open_drawer == Open ,
- Stopped + stop == Stopped ,
- // +------------------------------------------------------------------------------+
- Open + open_close / close_drawer == Empty ,
- // +------------------------------------------------------------------------------+
- Empty + open_close / open_drawer == Open ,
- Empty + cd_detected
- [good_disk_format&&(event_(cd_type)==Int_<DISK_CD>())]
- / (store_cd_info,process_(play))
- == Stopped ,
- // +------------------------------------------------------------------------------+
- Playing + stop / stop_playback == Stopped ,
- Playing + pause / pause_playback == Paused ,
- Playing + open_close / stop_and_open == Open ,
- // +------------------------------------------------------------------------------+
- Paused + end_pause / resume_playback == Playing ,
- Paused + stop / stop_playback == Stopped ,
- Paused + open_close / stop_and_open == Open
- // +------------------------------------------------------------------------------+
- ),transition_table)
- // create a state machine "on the fly"
- BOOST_MSM_EUML_DECLARE_STATE_MACHINE(( transition_table, //STT
- init_ << Empty, // Init State
- no_action, // Entry
- no_action, // Exit
- attributes_ << no_attributes_, // Attributes
- configure_ << no_configure_, // configuration
- Log_No_Transition // no_transition handler
- ),
- player_) //fsm name
- // choice of back-end
- 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;
- }
- void test()
- {
- player p;
- // needed to start the highest-level SM. This will call on_entry and mark the start of the SM
- p.start();
- // go to Open, call on_exit on Empty, then action, then on_entry on Open
- p.process_event(open_close); pstate(p);
- std::cout << "sending internal event (not rejected)" << std::endl;
- p.process_event(internal_event);
- std::cout << "sending open_close event. Conflict with internal transitions (rejecting event)" << std::endl;
- p.process_event(open_close); pstate(p);
- // will be rejected, wrong disk type
- p.process_event(
- cd_detected("louie, louie",DISK_DVD)); pstate(p);
- p.process_event(
- cd_detected("louie, louie",DISK_CD)); pstate(p);
- // no need to call play as the previous event does it in its action method
- //p.process_event(play);
- // at this point, Play is active
- // make transition happen inside it. Player has no idea about this event but it's ok.
- p.process_event(next_song);pstate(p); //2nd song active
- p.process_event(next_song);pstate(p);//3rd song active
- p.process_event(previous_song);pstate(p);//2nd song active
- // event handled internally in Playing, without region checking
- std::cout << "sending internal event (not rejected)" << std::endl;
- p.process_event(internal_event);
- p.process_event(pause); pstate(p);
- // go back to Playing
- p.process_event(end_pause); pstate(p);
- p.process_event(pause); pstate(p);
- p.process_event(stop); pstate(p);
- // event leading to the same state
- // no action method called as none is defined in the transition table
- p.process_event(stop); pstate(p);
- // test call to no_transition
- p.process_event(pause); pstate(p);
- }
- }
- int main()
- {
- test();
- return 0;
- }
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