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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) | |
10 | ||
11 | #include <vector> | |
12 | #include <iostream> | |
13 | ||
14 | #include <boost/msm/back/state_machine.hpp> | |
15 | #include <boost/msm/front/euml/euml.hpp> | |
16 | ||
17 | using namespace std; | |
18 | using namespace boost::msm::front::euml; | |
19 | namespace msm = boost::msm; | |
20 | ||
21 | // entry/exit/action/guard logging functors | |
22 | #include "logging_functors.h" | |
23 | ||
24 | namespace // Concrete FSM implementation | |
25 | { | |
26 | // events | |
27 | // note that unlike the SimpleTutorial, events must derive from euml_event. | |
28 | BOOST_MSM_EUML_EVENT(play) | |
29 | BOOST_MSM_EUML_EVENT(end_pause) | |
30 | BOOST_MSM_EUML_EVENT(stop) | |
31 | BOOST_MSM_EUML_EVENT(pause) | |
32 | BOOST_MSM_EUML_EVENT(open_close) | |
33 | ||
34 | // A "complicated" event type that carries some data. | |
35 | BOOST_MSM_EUML_DECLARE_ATTRIBUTE(std::string,cd_name) | |
36 | BOOST_MSM_EUML_DECLARE_ATTRIBUTE(DiskTypeEnum,cd_type) | |
37 | BOOST_MSM_EUML_ATTRIBUTES((attributes_ << cd_name << cd_type ), cd_detected_attributes) | |
38 | BOOST_MSM_EUML_EVENT_WITH_ATTRIBUTES(cd_detected,cd_detected_attributes) | |
39 | ||
40 | // Concrete FSM implementation | |
41 | ||
42 | // The list of FSM states | |
43 | ||
44 | // state not needing any entry or exit | |
45 | BOOST_MSM_EUML_STATE((),Paused) | |
46 | BOOST_MSM_EUML_STATE(( Empty_Entry,Empty_Exit ),Empty) | |
47 | BOOST_MSM_EUML_STATE(( Open_Entry,Open_Exit ),Open) | |
48 | BOOST_MSM_EUML_STATE(( Stopped_Entry,Stopped_Exit ),Stopped) | |
49 | BOOST_MSM_EUML_STATE(( Playing_Entry,Playing_Exit ),Playing) | |
50 | ||
51 | // guard conditions | |
52 | BOOST_MSM_EUML_ACTION(good_disk_format) | |
53 | { | |
54 | template <class FSM,class EVT,class SourceState,class TargetState> | |
55 | bool operator()(EVT const& evt,FSM&,SourceState& ,TargetState& ) | |
56 | { | |
57 | // to test a guard condition, let's say we understand only CDs, not DVD | |
58 | if (evt.get_attribute(cd_type)!=DISK_CD) | |
59 | { | |
60 | std::cout << "wrong disk, sorry" << std::endl; | |
61 | // just for logging, does not block any transition | |
62 | return true; | |
63 | } | |
64 | std::cout << "good disk" << std::endl; | |
65 | return true; | |
66 | } | |
67 | }; | |
68 | // replaces the old transition table | |
69 | BOOST_MSM_EUML_TRANSITION_TABLE(( | |
70 | Stopped + play / start_playback == Playing , | |
71 | Stopped + open_close / open_drawer == Open , | |
72 | Stopped + stop == Stopped, | |
73 | // +------------------------------------------------------------------------------+ | |
74 | Open + open_close / close_drawer == Empty , | |
75 | // +------------------------------------------------------------------------------+ | |
76 | Empty + open_close / open_drawer == Open , | |
77 | Empty + cd_detected | |
78 | [good_disk_format &&(event_(cd_type)==Int_<DISK_CD>())] | |
79 | / (store_cd_info,process_(play)) == Stopped , | |
80 | // +------------------------------------------------------------------------------+ | |
81 | Playing + stop / stop_playback == Stopped , | |
82 | Playing + pause / pause_playback == Paused , | |
83 | Playing + open_close / stop_and_open == Open , | |
84 | // +------------------------------------------------------------------------------+ | |
85 | Paused + end_pause / resume_playback == Playing , | |
86 | Paused + stop / stop_playback == Stopped , | |
87 | Paused + open_close / stop_and_open == Open | |
88 | // +------------------------------------------------------------------------------+ | |
89 | ),transition_table) | |
90 | ||
91 | // create a state machine "on the fly" | |
92 | BOOST_MSM_EUML_DECLARE_STATE_MACHINE(( transition_table, //STT | |
93 | init_ << Empty, // Init State | |
94 | no_action, // Entry | |
95 | no_action, // Exit | |
96 | attributes_ << no_attributes_, // Attributes | |
97 | configure_ << no_configure_, // configuration | |
98 | Log_No_Transition // no_transition handler | |
99 | ), | |
100 | player_) //fsm name | |
101 | ||
102 | // choice of back-end | |
103 | typedef msm::back::state_machine<player_> player; | |
104 | ||
105 | // | |
106 | // Testing utilities. | |
107 | // | |
108 | static char const* const state_names[] = { "Stopped", "Open", "Empty", "Playing", "Paused" }; | |
109 | void pstate(player const& p) | |
110 | { | |
111 | std::cout << " -> " << state_names[p.current_state()[0]] << std::endl; | |
112 | } | |
113 | ||
114 | void test() | |
115 | { | |
116 | player p; | |
117 | // needed to start the highest-level SM. This will call on_entry and mark the start of the SM | |
118 | p.start(); | |
119 | // go to Open, call on_exit on Empty, then action, then on_entry on Open | |
120 | p.process_event(open_close); pstate(p); | |
121 | p.process_event(open_close); pstate(p); | |
122 | // will be rejected, wrong disk type | |
123 | p.process_event( | |
124 | cd_detected("louie, louie",DISK_DVD)); pstate(p); | |
125 | p.process_event( | |
126 | cd_detected("louie, louie",DISK_CD)); pstate(p); | |
127 | // no need to call play as the previous event does it in its action method | |
128 | //p.process_event(play); | |
129 | ||
130 | // at this point, Play is active | |
131 | p.process_event(pause); pstate(p); | |
132 | // go back to Playing | |
133 | p.process_event(end_pause); pstate(p); | |
134 | p.process_event(pause); pstate(p); | |
135 | p.process_event(stop); pstate(p); | |
136 | // event leading to the same state | |
137 | // no action method called as none is defined in the transition table | |
138 | p.process_event(stop); pstate(p); | |
139 | // test call to no_transition | |
140 | p.process_event(pause); pstate(p); | |
141 | } | |
142 | } | |
143 | ||
144 | int main() | |
145 | { | |
146 | test(); | |
147 | return 0; | |
148 | } | |
149 |