]>
git.proxmox.com Git - ceph.git/blob - ceph/src/boost/libs/msm/doc/PDF/examples/HistoryEuml.cpp
1 // Copyright 2010 Christophe Henry
2 // henry UNDERSCORE christophe AT hotmail DOT com
3 // This is an extended version of the state machine available in the boost::mpl library
4 // Distributed under the same license as the original.
5 // Copyright for the original version:
6 // Copyright 2005 David Abrahams and Aleksey Gurtovoy. Distributed
7 // under the Boost Software License, Version 1.0. (See accompanying
8 // file LICENSE_1_0.txt or copy at
9 // http://www.boost.org/LICENSE_1_0.txt)
13 #include <boost/msm/back/state_machine.hpp>
14 #include <boost/msm/front/euml/euml.hpp>
17 using namespace boost::msm::front::euml
;
18 namespace msm
= boost::msm
;
19 namespace mpl
= boost::mpl
;
21 // entry/exit/action/guard logging functors
22 #include "logging_functors.h"
24 namespace // Concrete FSM implementation
27 BOOST_MSM_EUML_EVENT(play
)
28 BOOST_MSM_EUML_EVENT(end_pause
)
29 BOOST_MSM_EUML_EVENT(stop
)
30 BOOST_MSM_EUML_EVENT(pause
)
31 BOOST_MSM_EUML_EVENT(open_close
)
32 BOOST_MSM_EUML_EVENT(next_song
)
33 BOOST_MSM_EUML_EVENT(previous_song
)
35 // A "complicated" event type that carries some data.
36 BOOST_MSM_EUML_DECLARE_ATTRIBUTE(std::string
,cd_name
)
37 BOOST_MSM_EUML_DECLARE_ATTRIBUTE(DiskTypeEnum
,cd_type
)
38 BOOST_MSM_EUML_ATTRIBUTES((attributes_
<< cd_name
<< cd_type
), cd_detected_attributes
)
39 BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES(cd_detected
,cd_detected_attributes
)
41 // Concrete FSM implementation
42 // The list of FSM states
43 // state not defining any entry or exit
44 BOOST_MSM_EUML_STATE((),Paused
)
45 BOOST_MSM_EUML_STATE(( Empty_Entry
,Empty_Exit
),Empty
)
46 BOOST_MSM_EUML_STATE(( Open_Entry
,Open_Exit
),Open
)
47 BOOST_MSM_EUML_STATE(( Stopped_Entry
,Stopped_Exit
),Stopped
)
50 // Playing is now a state machine itself.
53 BOOST_MSM_EUML_STATE(( Song1_Entry
,Song1_Exit
),Song1
)
54 BOOST_MSM_EUML_STATE(( Song2_Entry
,Song2_Exit
),Song2
)
55 BOOST_MSM_EUML_STATE(( Song3_Entry
,Song3_Exit
),Song3
)
58 // Playing has a transition table
59 BOOST_MSM_EUML_TRANSITION_TABLE((
60 // +------------------------------------------------------------------------------+
61 Song2
== Song1
+ next_song
/ start_next_song
,
62 Song1
== Song2
+ previous_song
/ start_prev_song
,
63 Song3
== Song2
+ next_song
/ start_next_song
,
64 Song2
== Song3
+ previous_song
/ start_prev_song
65 // +------------------------------------------------------------------------------+
66 ),playing_transition_table
)
68 // VC9 cannot compile the typedef with build_sm if one is also used for player
69 BOOST_MSM_EUML_DECLARE_STATE_MACHINE( (playing_transition_table
, //STT
70 init_
<< Song1
// Init State
73 typedef msm::back::state_machine
<Playing_
,
74 msm::back::ShallowHistory
<mpl::vector
<BOOST_MSM_EUML_EVENT_NAME(end_pause
)> > > Playing_type
;
75 Playing_type
const Playing
;
78 BOOST_MSM_EUML_ACTION(good_disk_format
)
80 template <class FSM
,class EVT
,class SourceState
,class TargetState
>
81 bool operator()(EVT
const& evt
,FSM
&,SourceState
& ,TargetState
& )
83 // to test a guard condition, let's say we understand only CDs, not DVD
84 if (evt
.get_attribute(cd_type
)!=DISK_CD
)
86 std::cout
<< "wrong disk, sorry" << std::endl
;
87 // just for logging, does not block any transition
90 std::cout
<< "good disk" << std::endl
;
94 // replaces the old transition table
95 BOOST_MSM_EUML_TRANSITION_TABLE((
96 Playing
== Stopped
+ play
/ start_playback
,
97 Playing
== Paused
+ end_pause
/ resume_playback
,
98 // +------------------------------------------------------------------------------+
99 Empty
== Open
+ open_close
/ close_drawer
,
100 // +------------------------------------------------------------------------------+
101 Open
== Empty
+ open_close
/ open_drawer
,
102 Open
== Paused
+ open_close
/ stop_and_open
,
103 Open
== Stopped
+ open_close
/ open_drawer
,
104 Open
== Playing
+ open_close
/ stop_and_open
,
105 // +------------------------------------------------------------------------------+
106 Paused
== Playing
+ pause
/ pause_playback
,
107 // +------------------------------------------------------------------------------+
108 Stopped
== Playing
+ stop
/ stop_playback
,
109 Stopped
== Paused
+ stop
/ stop_playback
,
110 Stopped
== Empty
+ cd_detected
[good_disk_format
&&
111 (event_(cd_type
)==Int_
<DISK_CD
>())]
112 / (store_cd_info
,process_(play
)),
113 Stopped
== Stopped
+ stop
114 // +------------------------------------------------------------------------------+
117 // create a state machine "on the fly"
118 BOOST_MSM_EUML_DECLARE_STATE_MACHINE(( transition_table
, //STT
119 init_
<< Empty
, // Init State
122 attributes_
<< no_attributes_
, // Attributes
123 configure_
<< no_configure_
, // configuration
124 Log_No_Transition
// no_transition handler
128 // choice of back-end
129 typedef msm::back::state_machine
<player_
> player
;
132 // Testing utilities.
134 static char const* const state_names
[] = { "Stopped", "Paused", "Open", "Empty", "Playing" };
135 void pstate(player
const& p
)
137 std::cout
<< " -> " << state_names
[p
.current_state()[0]] << std::endl
;
143 // needed to start the highest-level SM. This will call on_entry and mark the start of the SM
145 // go to Open, call on_exit on Empty, then action, then on_entry on Open
146 p
.process_event(open_close
); pstate(p
);
147 p
.process_event(open_close
); pstate(p
);
148 // will be rejected, wrong disk type
150 cd_detected("louie, louie",DISK_DVD
)); pstate(p
);
152 cd_detected("louie, louie",DISK_CD
)); pstate(p
);
153 // no need to call play as the previous event does it in its action method
154 //p.process_event(play);
156 // make transition happen inside it. Player has no idea about this event but it's ok.
157 p
.process_event(next_song
);pstate(p
); //2nd song active
158 p
.process_event(next_song
);pstate(p
);//3rd song active
159 p
.process_event(previous_song
);pstate(p
);//2nd song active
161 // at this point, Play is active
162 p
.process_event(pause
); pstate(p
);
163 // go back to Playing
164 // as you see, remembers the original state as end_pause is an history trigger
165 p
.process_event(end_pause
); pstate(p
);
166 p
.process_event(pause
); pstate(p
);
167 p
.process_event(stop
); pstate(p
);
168 // event leading to the same state
169 // no action method called as none is defined in the transition table
170 p
.process_event(stop
); pstate(p
);
171 // test call to no_transition
172 p
.process_event(play
); pstate(p
);