source/libr2c2/trainrouteplanner.h

   1 #ifndef LIBR2C2_TRAINROUTEPLANNER_H_
   2 #define LIBR2C2_TRAINROUTEPLANNER_H_
   3
   4 #include <list>
   5 #include <vector>
   6 #include <msp/core/thread.h>
   7 #include <msp/time/timedelta.h>
   8 #include "trackiter.h"
   9 #include "trainrouter.h"
  10
  11 namespace R2C2 {
  12
  13 class Layout;
  14 class Route;
  15 class Track;
  16 class Train;
  17
  18 class TrainRoutePlanner
  19 {
  20 public:
  21         enum Result
  22         {
  23                 PENDING,
  24                 COMPLETE,
  25                 FAILED
  26         };
  27
  28 private:
  29         struct TrainRoutingState;
  30
  31         struct TrainRoutingInfo
  32         {
  33                 Train *train;
  34                 float speed;
  35                 Block *first_noncritical;
  36                 TrainRouter *router;
  37                 const TrackChain *destination;
  38                 std::vector<const TrackChain *> waypoints;
  39                 std::vector<const TrainRouteMetric *> metrics;
  40                 bool has_duration;
  41                 std::list<Route *> routes;
  42                 Track *track_history[2];
  43                 std::list<TrainRouter::SequencePoint> sequence;
  44
  45                 TrainRoutingInfo(Train &);
  46         };
  47
  48         struct OccupiedTrack
  49         {
  50                 Track *track;
  51                 float path_length;
  52                 OccupiedTrack *next;
  53                 unsigned n_tracks;
  54                 unsigned refcount;
  55
  56                 OccupiedTrack(Track &, unsigned, OccupiedTrack *);
  57                 OccupiedTrack(const OccupiedTrack &);
  58                 ~OccupiedTrack();
  59         };
  60
  61         enum TrainState
  62         {
  63                 MOVING,
  64                 WAITING,
  65                 BLOCKED,
  66                 ARRIVED
  67         };
  68
  69         struct TrainRoutingState
  70         {
  71                 TrainRoutingInfo *info;
  72                 TrackIter track;
  73                 unsigned char path;
  74                 bool critical;
  75                 OccupiedTrack *occupied_tracks;
  76                 float offset;
  77                 float back_offset;
  78                 TrainState state;
  79                 Msp::Time::TimeDelta delay;
  80                 Msp::Time::TimeDelta duration;
  81                 int waypoint;
  82                 float distance_traveled;
  83                 float remaining_estimate;
  84                 Msp::Time::TimeDelta wait_time;
  85                 int blocked_by;
  86
  87                 TrainRoutingState(TrainRoutingInfo &);
  88                 TrainRoutingState(const TrainRoutingState &);
  89                 ~TrainRoutingState();
  90
  91                 Msp::Time::TimeDelta get_time_to_next_track() const;
  92                 bool is_occupying(Track &) const;
  93                 bool check_arrival();
  94                 void advance(float);
  95                 void advance(const Msp::Time::TimeDelta &);
  96                 void advance_track(unsigned);
  97                 void update_estimate();
  98         };
  99
 100         struct RoutingStep
 101         {
 102                 Msp::Time::TimeDelta time;
 103                 Msp::Time::TimeDelta penalty;
 104                 Msp::Time::TimeDelta cost_estimate;
 105                 std::vector<TrainRoutingState> trains;
 106                 const RoutingStep *prev;
 107
 108                 RoutingStep();
 109                 RoutingStep(const RoutingStep *);
 110
 111                 void create_successors(std::list<RoutingStep> &) const;
 112                 bool update_states();
 113                 bool check_deadlocks() const;
 114                 int get_occupant(Track &) const;
 115                 int find_next_train() const;
 116                 void advance(const Msp::Time::TimeDelta &);
 117                 void update_estimate();
 118                 bool is_viable() const;
 119                 bool is_goal() const;
 120
 121                 bool operator<(const RoutingStep &) const;
 122         };
 123
 124         class PlanningThread: public Msp::Thread
 125         {
 126         private:
 127                 TrainRoutePlanner &planner;
 128
 129         public:
 130                 PlanningThread(TrainRoutePlanner &);
 131
 132         private:
 133                 virtual void main();
 134         };
 135
 136         std::vector<TrainRoutingInfo> routed_trains;
 137         std::list<RoutingStep> steps;
 138         std::list<RoutingStep> queue;
 139         const RoutingStep *goal;
 140         Result result;
 141         PlanningThread *thread;
 142
 143 public:
 144         TrainRoutePlanner(Layout &);
 145         ~TrainRoutePlanner();
 146
 147         Result plan();
 148         void plan_async();
 149         Result check();
 150         Result get_result() const { return result; }
 151         const std::list<Route *> &get_routes_for(const Train &) const;
 152         const std::list<TrainRouter::SequencePoint> &get_sequence_for(const Train &) const;
 153 private:
 154         const TrainRoutingInfo &get_train_info(const Train &) const;
 155         const RoutingStep &get_step();
 156         void prepare_plan();
 157         void create_plan();
 158         void add_steps(const RoutingStep &);
 159         void finalize_plan();
 160 };
 161
 162 } // namespace R2C2
 163
 164 #endif