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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 | using namespace boost::msm::front; | |
20 | namespace msm = boost::msm; | |
21 | ||
22 | // entry/exit/action/guard logging functors | |
23 | #include "logging_functors.h" | |
24 | ||
25 | namespace // Concrete FSM implementation | |
26 | { | |
27 | // events | |
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 | BOOST_MSM_EUML_EVENT(internal_event) | |
34 | ||
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) | |
40 | ||
41 | // Concrete FSM implementation | |
42 | ||
43 | // The list of FSM states | |
44 | BOOST_MSM_EUML_STATE(( Empty_Entry,Empty_Exit ),Empty) | |
45 | BOOST_MSM_EUML_STATE(( Open_Entry,Open_Exit ),Open) | |
46 | BOOST_MSM_EUML_STATE(( Stopped_Entry,Stopped_Exit ),Stopped) | |
47 | BOOST_MSM_EUML_STATE(( Playing_Entry,Playing_Exit ),Playing) | |
48 | // state not needing any entry or exit | |
49 | BOOST_MSM_EUML_STATE((),Paused) | |
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 | Playing == Stopped + play / start_playback , | |
71 | Playing == Paused + end_pause / resume_playback, | |
72 | // +------------------------------------------------------------------------------+ | |
73 | Empty == Open + open_close / close_drawer, | |
74 | // +------------------------------------------------------------------------------+ | |
75 | Open == Empty + open_close / open_drawer, | |
76 | Open == Paused + open_close / stop_and_open, | |
77 | Open == Stopped + open_close / open_drawer, | |
78 | Open == Playing + open_close / stop_and_open, | |
79 | Open + open_close [internal_guard1] / internal_action1, | |
80 | Open + open_close [internal_guard2] / internal_action2, | |
81 | Open + internal_event / internal_action , | |
82 | // +------------------------------------------------------------------------------+ | |
83 | Paused == Playing + pause / pause_playback, | |
84 | // +------------------------------------------------------------------------------+ | |
85 | Stopped == Playing + stop / stop_playback, | |
86 | Stopped == Paused + stop / stop_playback, | |
87 | Stopped == Empty + cd_detected [good_disk_format&& | |
88 | (event_(cd_type)==Int_<DISK_CD>())] | |
89 | / (store_cd_info,process_(play)), | |
90 | Stopped == Stopped + stop | |
91 | // +------------------------------------------------------------------------------+ | |
92 | ),transition_table) | |
93 | ||
94 | ||
95 | // create a state machine "on the fly" | |
96 | BOOST_MSM_EUML_DECLARE_STATE_MACHINE(( transition_table, //STT | |
97 | init_ << Empty, // Init State | |
98 | no_action, // Entry | |
99 | no_action, // Exit | |
100 | attributes_ << no_attributes_, // Attributes | |
101 | configure_ << no_configure_, // configuration | |
102 | Log_No_Transition // no_transition handler | |
103 | ), | |
104 | player_) //fsm name | |
105 | // choice of back-end | |
106 | typedef msm::back::state_machine<player_> player; | |
107 | ||
108 | // | |
109 | // Testing utilities. | |
110 | // | |
111 | static char const* const state_names[] = { "Stopped", "Paused", "Open", "Empty", "Playing" }; | |
112 | void pstate(player const& p) | |
113 | { | |
114 | std::cout << " -> " << state_names[p.current_state()[0]] << std::endl; | |
115 | } | |
116 | ||
117 | void test() | |
118 | { | |
119 | player p; | |
120 | // needed to start the highest-level SM. This will call on_entry and mark the start of the SM | |
121 | p.start(); | |
122 | // go to Open, call on_exit on Empty, then action, then on_entry on Open | |
123 | p.process_event(open_close); pstate(p); | |
124 | std::cout << "sending internal event (not rejected)" << std::endl; | |
125 | p.process_event(internal_event); | |
126 | std::cout << "sending open_close event. Conflict with internal transitions (rejecting event)" << std::endl; | |
127 | p.process_event(open_close); pstate(p); | |
128 | // will be rejected, wrong disk type | |
129 | p.process_event( | |
130 | cd_detected("louie, louie",DISK_DVD)); pstate(p); | |
131 | p.process_event( | |
132 | cd_detected("louie, louie",DISK_CD)); pstate(p); | |
133 | // no need to call play() as the previous event does it in its action method | |
134 | //p.process_event(play); | |
135 | ||
136 | // at this point, Play is active | |
137 | p.process_event(pause); pstate(p); | |
138 | // go back to Playing | |
139 | p.process_event(end_pause); pstate(p); | |
140 | p.process_event(pause); pstate(p); | |
141 | p.process_event(stop); pstate(p); | |
142 | // event leading to the same state | |
143 | // no action method called as none is defined in the transition table | |
144 | p.process_event(stop); pstate(p); | |
145 | // test call to no_transition | |
146 | p.process_event(pause); pstate(p); | |
147 | } | |
148 | } | |
149 | ||
150 | int main() | |
151 | { | |
152 | test(); | |
153 | return 0; | |
154 | } |