source/libr2c2/trainrouter.cpp

   1 #include "layout.h"
   2 #include "route.h"
   3 #include "trackiter.h"
   4 #include "train.h"
   5 #include "trackchain.h"
   6 #include "trainroutemetric.h"
   7 #include "trainrouteplanner.h"
   8 #include "trainrouter.h"
   9
  10 using namespace std;
  11 using namespace Msp;
  12
  13 namespace R2C2 {
  14
  15 TrainRouter::TrainRouter(Train &t):
  16         TrainAI(t),
  17         priority(0),
  18         arrival(ON_THE_WAY),
  19         destination(0),
  20         destination_changed(false),
  21         metrics_stale(false),
  22         current_sequence(0),
  23         sequence_check_pending(false)
  24 {
  25         train.get_layout().signal_block_reserved.connect(sigc::mem_fun(this, &TrainRouter::block_reserved));
  26         train.signal_advanced.connect(sigc::mem_fun(this, &TrainRouter::train_advanced));
  27         train.signal_rear_advanced.connect(sigc::mem_fun(this, &TrainRouter::train_rear_advanced));
  28 }
  29
  30 TrainRouter::~TrainRouter()
  31 {
  32         for(vector<TrainRouteMetric *>::iterator i=metrics.begin(); i!=metrics.end(); ++i)
  33                 delete *i;
  34 }
  35
  36 void TrainRouter::set_priority(int p)
  37 {
  38         priority = p;
  39 }
  40
  41 bool TrainRouter::set_route(const Route *r)
  42 {
  43         BlockIter fncb = train.get_first_noncritical_block();
  44
  45         Route *lead = 0;
  46         if(r && train.is_placed())
  47         {
  48                 const BlockAllocator &allocator = train.get_block_allocator();
  49                 TrackIter first = allocator.first().track_iter();
  50                 TrackIter next = fncb.track_iter();
  51                 if(!r->has_track(*next))
  52                 {
  53                         lead = Route::find(next, *r);
  54                         if(!lead)
  55                                 return false;
  56                         create_lead_route(lead, lead);
  57                 }
  58                 else if(!r->has_track(*first))
  59                         lead = create_lead_route(0, r);
  60         }
  61
  62         routes.clear();
  63         if(lead)
  64                 routes.push_back(lead);
  65         // TODO Check if eclipsed by lead route
  66         if(r)
  67                 routes.push_back(r);
  68
  69         destination = 0;
  70         waypoints.clear();
  71         sequence_points.clear();
  72         current_sequence = 0;
  73         sequence_check_pending = false;
  74
  75         route_changed();
  76
  77         return true;
  78 }
  79
  80 const Route *TrainRouter::get_route() const
  81 {
  82         if(routes.empty())
  83                 return 0;
  84         return routes.front();
  85 }
  86
  87 void TrainRouter::route_changed()
  88 {
  89         BlockIter fncb = train.get_first_noncritical_block();
  90
  91         reserving_route = routes.begin();
  92         bool already_at_end = false;
  93         if(!routes.empty())
  94         {
  95                 /* Find the route that should be used for the next allocated block.  We
  96                 can't rely on the resync code in block_reserved since we may need to
  97                 clear the stop marker to continue allocation. */
  98                 TrackIter track = train.get_block_allocator().first().track_iter();
  99                 for(; track; track=track.next())
 100                 {
 101                         if(!advance_to_track(reserving_route, *track))
 102                         {
 103                                 already_at_end = true;
 104                                 break;
 105                         }
 106                         if(&track->get_block()==fncb.block())
 107                                 break;
 108                 }
 109         }
 110
 111         if(!already_at_end)
 112         {
 113                 // We are not at the end of the route now, but might have been before.
 114                 arrival = ON_THE_WAY;
 115                 train.refresh_blocks_from(*fncb);
 116                 if(!arrival)
 117                         train.stop_at(0);
 118         }
 119         else if(!arrival)
 120         {
 121                 /* If arrival wasn't set before (perhaps because we weren't on a route),
 122                 set it now. */
 123                 arrival = RESERVED_TO_END;
 124                 train.stop_at(&*fncb.flip());
 125                 train.refresh_blocks_from(*fncb);
 126         }
 127
 128         const Route *route = get_route();
 129         signal_route_changed.emit(route);
 130         signal_event.emit(Message("route-changed", route));
 131 }
 132
 133 void TrainRouter::set_destination(const TrackChain &d)
 134 {
 135         destination = &d;
 136         destination_changed = true;
 137         metrics_stale = true;
 138 }
 139
 140 bool TrainRouter::is_destination(Track &track) const
 141 {
 142         if(destination)
 143                 return destination->has_track(track);
 144         else
 145                 return false;
 146 }
 147
 148 void TrainRouter::add_waypoint(const TrackChain &wp)
 149 {
 150         waypoints.push_back(&wp);
 151         destination_changed = true;
 152         metrics_stale = true;
 153 }
 154
 155 bool TrainRouter::is_waypoint(unsigned index, Track &track) const
 156 {
 157         if(index>=waypoints.size())
 158                 throw out_of_range("TrainRouter::is_waypoint");
 159
 160         return waypoints[index]->has_track(track);
 161 }
 162
 163 const TrainRouteMetric &TrainRouter::get_metric(int index) const
 164 {
 165         if(!destination)
 166                 throw logic_error("no metrics");
 167         else if(metrics_stale)
 168                 throw logic_error("metrics are stale");
 169
 170         if(index<0)
 171                 return *metrics.front();
 172         else if(static_cast<unsigned>(index)>=waypoints.size())
 173                 throw out_of_range("TrainRouter::get_metric");
 174         else
 175                 return *metrics[index+1];
 176 }
 177
 178 void TrainRouter::set_departure_delay(const Time::TimeDelta &d)
 179 {
 180         delay = d;
 181         destination_changed = true;
 182 }
 183
 184 void TrainRouter::set_trip_duration(const Time::TimeDelta &d)
 185 {
 186         duration = d;
 187 }
 188
 189 void TrainRouter::message(const Message &msg)
 190 {
 191         if(msg.type=="set-route")
 192         {
 193                 if(msg.value.check_type<Route *>())
 194                         set_route(msg.value.value<Route *>());
 195                 else
 196                         set_route(msg.value.value<const Route *>());
 197         }
 198         else if(msg.type=="clear-route")
 199                 set_route(0);
 200         else if(msg.type=="set-destination")
 201         {
 202                 if(msg.value.check_type<TrackChain *>())
 203                         set_destination(*msg.value.value<TrackChain *>());
 204                 else
 205                         set_destination(*msg.value.value<const TrackChain *>());
 206         }
 207         else if(msg.type=="add-waypoint")
 208         {
 209                 if(msg.value.check_type<TrackChain *>())
 210                         add_waypoint(*msg.value.value<TrackChain *>());
 211                 else
 212                         add_waypoint(*msg.value.value<const TrackChain *>());
 213         }
 214         else if(msg.type=="set-departure-delay")
 215                 set_departure_delay(msg.value.value<Time::TimeDelta>());
 216         else if(msg.type=="set-trip-duration")
 217                 set_trip_duration(msg.value.value<Time::TimeDelta>());
 218 }
 219
 220 void TrainRouter::tick(const Time::TimeDelta &dt)
 221 {
 222         if(delay)
 223         {
 224                 delay -= dt;
 225                 if(delay<Time::zero)
 226                 {
 227                         duration = max(duration+delay, Time::zero);
 228                         delay = Time::zero;
 229                 }
 230         }
 231         else if(duration)
 232                 duration = max(duration-dt, Time::zero);
 233
 234         if(destination_changed && !planner)
 235                 start_planning(train.get_layout());
 236
 237         if(planner && planner->check()!=TrainRoutePlanner::PENDING)
 238         {
 239                 destination_changed = false;
 240                 if(planner->get_result()==TrainRoutePlanner::COMPLETE)
 241                 {
 242                         const list<Route *> &planned_routes = planner->get_routes_for(train);
 243
 244                         routes.clear();
 245                         Route *lead = create_lead_route(0, planned_routes.front());
 246                         routes.push_back(lead);
 247
 248                         list<Route *>::const_iterator begin = planned_routes.begin();
 249                         for(; begin!=planned_routes.end(); ++begin)
 250                         {
 251                                 const Route::TrackSet &tracks = (*begin)->get_tracks();
 252                                 bool eclipsed = true;
 253                                 for(Route::TrackSet::const_iterator i=tracks.begin(); (eclipsed && i!=tracks.end()); ++i)
 254                                         eclipsed = lead->has_track(**i);
 255                                 if(!eclipsed)
 256                                         break;
 257                         }
 258                         routes.insert(routes.end(), begin, planned_routes.end());
 259
 260                         sequence_points = planner->get_sequence_for(train);
 261                         current_sequence = 0;
 262                         sequence_check_pending = false;
 263
 264                         route_changed();
 265                 }
 266                 planner = 0;
 267         }
 268
 269         if(sequence_check_pending)
 270         {
 271                 if(sequence_points.front().is_cleared())
 272                         train.stop_at(0);
 273                 sequence_check_pending = false;
 274         }
 275
 276         if(arrival==RESERVED_TO_END && !train.get_speed())
 277         {
 278                 signal_arrived.emit(destination);
 279                 signal_event.emit(Message("arrived", destination));
 280                 arrival = ARRIVED;
 281         }
 282         else if(arrival==ARRIVED && !train.get_block_allocator().is_active())
 283                 set_route(0);
 284 }
 285
 286 void TrainRouter::save(list<DataFile::Statement> &st) const
 287 {
 288         st.push_back((DataFile::Statement("priority"), priority));
 289
 290         if(!routes.empty())
 291         {
 292                 RouteList::const_iterator i = routes.begin();
 293                 for(; (i!=routes.end() && (*i)->is_temporary()); ++i) ;
 294                 if(i!=routes.end())
 295                         st.push_back((DataFile::Statement("route"), (*i)->get_name()));
 296         }
 297 }
 298
 299 void TrainRouter::block_reserved(Block &block, Train *t)
 300 {
 301         if(routes.empty())
 302                 return;
 303
 304         if(t!=&train)
 305         {
 306                 if(!t)
 307                         return;
 308
 309                 // Are we waiting for the other train to pass a sequence point?
 310                 SequencePoint &sp = sequence_points.front();
 311                 if(sp.preceding_train==t && sp.block==&block)
 312                         /* The other train's router will advance its sequence on the same
 313                         signal and may not have handled it yet. */
 314                         sequence_check_pending = true;
 315
 316                 return;
 317         }
 318
 319         // Did we reach our next sequence point?
 320         if(!sequence_points.empty())
 321         {
 322                 SequencePoint &sp = sequence_points.front();
 323                 if(sp.block==&block)
 324                 {
 325                         current_sequence = sp.sequence_out;
 326                         sequence_points.pop_front();
 327                 }
 328         }
 329
 330         TrackIter track = train.get_block_allocator().iter_for(block).track_iter();
 331
 332         // Is the block a turnout?  If it is, set it to the correct path.
 333         if(unsigned taddr = block.get_turnout_address())
 334         {
 335                 int path = (*reserving_route)->get_turnout(taddr);
 336                 if(path>=0)
 337                         track->set_active_path(path);
 338         }
 339
 340         /* If the allocator has released blocks from the front, we may need to
 341         resync reserving_route. */
 342         if(reserving_route==routes.end() || !(*reserving_route)->has_track(*track))
 343         {
 344                 reserving_route = routes.begin();
 345                 arrival = ON_THE_WAY;
 346                 track = t->get_block_allocator().first().track_iter();
 347                 for(; track; track=track.next())
 348                 {
 349                         if(!advance_to_track(reserving_route, *track))
 350                                 throw logic_error("internal error (reservation outside of route)");
 351                         else if(&track->get_block()==&block)
 352                                 break;
 353                 }
 354         }
 355
 356         /* Keep reserving_route pointing to the route containing the block that is
 357         expected to be allocated next. */
 358         for(; track; track=track.next((*reserving_route)->get_path(*track)))
 359         {
 360                 if(!advance_to_track(reserving_route, *track))
 361                 {
 362                         // We've reached the end of the route.  Stop here.
 363                         arrival = RESERVED_TO_END;
 364                         train.stop_at(&block);
 365                         return;
 366                 }
 367                 if(&track->get_block()!=&block)
 368                         break;
 369         }
 370
 371         // Do we need to wait for another train to pass?
 372         if(!sequence_points.empty())
 373         {
 374                 SequencePoint &sp = sequence_points.front();
 375                 if(sp.block==&track->get_block() && !sp.is_cleared())
 376                         train.stop_at(&block);
 377         }
 378 }
 379
 380 void TrainRouter::train_advanced(Block &block)
 381 {
 382         BlockIter b_iter = train.get_block_allocator().iter_for(block);
 383
 384         if(!waypoints.empty())
 385         {
 386                 // A waypoint is considered reached when the train has advanced through it.
 387                 const TrackChain &wp = *waypoints.front();
 388                 TrackIter t_iter = b_iter.track_iter();
 389                 if(wp.has_track(*t_iter))
 390                 {
 391                         for(; t_iter; t_iter=t_iter.next())
 392                         {
 393                                 if(!wp.has_track(*t_iter))
 394                                 {
 395                                         waypoints.erase(waypoints.begin());
 396                                         signal_waypoint_reached.emit(&wp);
 397                                         signal_event.emit(Message("waypoint-reached", &wp));
 398                                         break;
 399                                 }
 400                                 else if(!block.has_track(*t_iter))
 401                                         break;
 402                         }
 403                 }
 404         }
 405 }
 406
 407 void TrainRouter::train_rear_advanced(Block &block)
 408 {
 409         Track &track = *train.get_block_allocator().iter_for(block).endpoint().track;
 410
 411         // Drop any routes that are now completely behind the train.
 412         for(RouteList::iterator i=routes.begin(); i!=routes.end(); ++i)
 413                 if((*i)->has_track(track))
 414                 {
 415                         if(i!=routes.begin())
 416                         {
 417                                 routes.erase(routes.begin(), i);
 418                                 const Route *route = get_route();
 419                                 signal_route_changed.emit(route);
 420                                 signal_event.emit(Message("route-changed", route));
 421                         }
 422                         break;
 423                 }
 424 }
 425
 426 void TrainRouter::create_metrics()
 427 {
 428         for(vector<TrainRouteMetric *>::iterator i=metrics.begin(); i!=metrics.end(); ++i)
 429                 delete *i;
 430         metrics.clear();
 431
 432         if(!destination)
 433                 return;
 434
 435         metrics.push_back(new TrainRouteMetric(*destination));
 436         for(vector<const TrackChain *>::const_iterator i=waypoints.begin(); i!=waypoints.end(); ++i)
 437                 metrics.push_back(new TrainRouteMetric(**i));
 438
 439         for(unsigned i=metrics.size(); --i>0; )
 440                 metrics[i]->chain_to(*metrics[(i+1)%metrics.size()]);
 441 }
 442
 443 Route *TrainRouter::create_lead_route(Route *lead, const Route *target)
 444 {
 445         if(!lead)
 446         {
 447                 lead = new Route(train.get_layout());
 448                 lead->set_name("Lead");
 449                 lead->set_temporary(true);
 450         }
 451
 452         bool target_tracks = 0;
 453         for(TrackIter i=train.get_block_allocator().first().track_iter(); (target_tracks<2 && i); i=i.next())
 454         {
 455                 if(i->get_block().get_train()!=&train)
 456                         break;
 457                 if(target)
 458                 {
 459                         if(target->has_track(*i))
 460                                 ++target_tracks;
 461                         else if(target_tracks>0)
 462                                 break;
 463                 }
 464                 lead->add_track(*i);
 465         }
 466
 467         return lead;
 468 }
 469
 470 bool TrainRouter::is_valid_for_track(const Route &route, Track &track) const
 471 {
 472         if(!route.has_track(track))
 473                 return false;
 474         if(track.get_type().is_turnout() && route.get_turnout(track.get_turnout_address())<0)
 475                 return false;
 476         return true;
 477 }
 478
 479 bool TrainRouter::advance_to_track(RouteList::iterator &route, Track &track)
 480 {
 481         if(!is_valid_for_track(**route, track))
 482         {
 483                 ++route;
 484                 if(route==routes.end())
 485                         return false;
 486                 if(!is_valid_for_track(**route, track))
 487                         throw logic_error("internal error (routes are not continuous)");
 488         }
 489
 490         return true;
 491 }
 492
 493 void TrainRouter::start_planning(Layout &layout)
 494 {
 495         RefPtr<TrainRoutePlanner> planner = new TrainRoutePlanner(layout);
 496
 497         const map<unsigned, Train *> &trains = layout.get_trains();
 498         for(map<unsigned, Train *>::const_iterator i=trains.begin(); i!=trains.end(); ++i)
 499                 if(TrainRouter *router = i->second->get_ai_of_type<TrainRouter>())
 500                 {
 501                         if(router->metrics_stale)
 502                         {
 503                                 router->create_metrics();
 504                                 router->metrics_stale = false;
 505                         }
 506                         router->planner = planner;
 507                 }
 508
 509         planner->plan_async();
 510 }
 511
 512
 513 TrainRouter::SequencePoint::SequencePoint(Block &b, unsigned o):
 514         block(&b),
 515         preceding_train(0),
 516         sequence_in(0),
 517         sequence_out(o)
 518 { }
 519
 520 bool TrainRouter::SequencePoint::is_cleared() const
 521 {
 522         if(!preceding_train)
 523                 return true;
 524
 525         TrainRouter *router = preceding_train->get_ai_of_type<TrainRouter>();
 526         return router->get_current_sequence()>=sequence_in;
 527 }
 528
 529
 530 TrainRouter::Loader::Loader(TrainRouter &r):
 531         DataFile::ObjectLoader<TrainRouter>(r)
 532 {
 533         add("priority", &TrainRouter::priority);
 534         add("route",    &Loader::route);
 535 }
 536
 537 void TrainRouter::Loader::route(const string &n)
 538 {
 539         obj.set_route(&obj.train.get_layout().get_route(n));
 540 }
 541
 542 } // namespace R2C2