source/libr2c2/blockallocator.cpp

   1 #include <msp/core/maputils.h>
   2 #include <msp/core/raii.h>
   3 #include "blockallocator.h"
   4 #include "block.h"
   5 #include "catalogue.h"
   6 #include "driver.h"
   7 #include "layout.h"
   8 #include "trackcircuit.h"
   9 #include "trackiter.h"
  10 #include "train.h"
  11 #include "vehicle.h"
  12
  13 using namespace std;
  14 using namespace Msp;
  15
  16 namespace R2C2 {
  17
  18 struct BlockAllocator::BlockMatch
  19 {
  20         const Block &block;
  21
  22         BlockMatch(const Block &b): block(b) { }
  23
  24         bool operator()(const BlockIter &bi) const { return &*bi==&block; }
  25 };
  26
  27
  28 BlockAllocator::BlockAllocator(Train &t):
  29         train(t),
  30         cur_blocks_end(blocks.end()),
  31         pending_block(0),
  32         stop_at_block(0),
  33         reserving(false)
  34 {
  35         Layout &layout = train.get_layout();
  36         layout.signal_block_reserved.connect(sigc::mem_fun(this, &BlockAllocator::block_reserved));
  37         layout.signal_sensor_state_changed.connect(sigc::mem_fun(this, &BlockAllocator::sensor_state_changed));
  38
  39         const set<Track *> &tracks = layout.get_all<Track>();
  40         for(set<Track *>::const_iterator i=tracks.begin(); i!=tracks.end(); ++i)
  41                 if((*i)->get_turnout_id())
  42                         (*i)->signal_path_changed.connect(sigc::hide(sigc::bind(sigc::mem_fun(this, &BlockAllocator::turnout_path_changed), sigc::ref(**i))));
  43 }
  44
  45 void BlockAllocator::start_from(const BlockIter &block)
  46 {
  47         if(!block)
  48                 throw invalid_argument("BlockAllocator::start_from");
  49
  50         clear();
  51         reserve_block(block);
  52 }
  53
  54 void BlockAllocator::clear()
  55 {
  56         release_blocks_begin(blocks.end());
  57         pending_block = 0;
  58         stop_at_block = 0;
  59 }
  60
  61 void BlockAllocator::stop_at(const Block *block)
  62 {
  63         stop_at_block = block;
  64 }
  65
  66 const BlockIter &BlockAllocator::first() const
  67 {
  68         if(blocks.empty())
  69                 throw logic_error("no blocks");
  70         return blocks.front();
  71 }
  72
  73 const BlockIter &BlockAllocator::last() const
  74 {
  75         if(blocks.empty())
  76                 throw logic_error("no blocks");
  77         BlockList::const_iterator i = --blocks.end();
  78         if(i->block()==pending_block)
  79                 --i;
  80         return *i;
  81 }
  82
  83 const BlockIter &BlockAllocator::last_current() const
  84 {
  85         if(blocks.empty())
  86                 throw logic_error("no blocks");
  87         if(cur_blocks_end==blocks.begin())
  88                 throw logic_error("internal error (no current blocks)");
  89         BlockList::const_iterator i = cur_blocks_end;
  90         return *--i;
  91 }
  92
  93 const BlockIter &BlockAllocator::iter_for(const Block &block) const
  94 {
  95         BlockList::const_iterator i = find_if(blocks.begin(), blocks.end(), IterBlockMatch(block));
  96         if(i==blocks.end())
  97                 throw key_error(&block);
  98         return *i;
  99 }
 100
 101 bool BlockAllocator::has_block(const Block &block) const
 102 {
 103         return find_if(blocks.begin(), blocks.end(), IterBlockMatch(block))!=blocks.end();
 104 }
 105
 106 bool BlockAllocator::is_block_current(const Block &block) const
 107 {
 108         return find_if(blocks.begin(), cur_blocks_end, IterBlockMatch(block))!=cur_blocks_end;
 109 }
 110
 111 void BlockAllocator::reserve_more()
 112 {
 113         if(blocks.empty())
 114                 throw logic_error("no blocks");
 115
 116         BlockIter start = blocks.back();
 117         if(&*start==stop_at_block)
 118                 return;
 119         else if(&*start==pending_block)
 120         {
 121                 TrackIter track = start.track_iter();
 122                 if(!track.endpoint().has_path(track->get_active_path()))
 123                         return;
 124         }
 125
 126         pending_block = 0;
 127
 128         // See how many sensor blocks and how much track we already have
 129         unsigned nsens = 0;
 130         float dist = 0;
 131         for(BlockList::const_iterator i=cur_blocks_end; i!=blocks.end(); ++i)
 132         {
 133                 if((*i)->get_sensor_id())
 134                         ++nsens;
 135                 if(nsens>0)
 136                         dist += (*i)->get_path_length(i->entry());
 137         }
 138
 139         float approach_margin = 50*train.get_layout().get_catalogue().get_scale();
 140         float min_dist = train.get_controller().get_braking_distance()*1.3+approach_margin*2;
 141
 142         BlockIter block = start;
 143
 144         SetFlag setf(reserving);
 145
 146         while(1)
 147         {
 148                 BlockIter prev = block;
 149                 block = block.next();
 150                 if(!block || block->get_endpoints().size()<2)
 151                         // The track ends here
 152                         break;
 153
 154                 if(block->get_turnout_id() && !prev->get_turnout_id())
 155                 {
 156                         /* We are arriving at a turnout.  See if we have enough blocks and
 157                         distance reserved. */
 158                         if(nsens>=3 && dist>=min_dist)
 159                                 break;
 160                 }
 161
 162                 if(!reserve_block(block))
 163                         break;
 164
 165                 if(cur_blocks_end==blocks.end())
 166                         --cur_blocks_end;
 167
 168                 TrackIter track = block.track_iter();
 169                 if(track->is_path_changing())
 170                 {
 171                         pending_block = &*block;
 172                         break;
 173                 }
 174                 else
 175                 {
 176                         const TrackType::Endpoint &entry_ep = track.endpoint();
 177                         unsigned path = track->get_active_path();
 178                         if(!entry_ep.has_path(path))
 179                         {
 180                                 const TrackType::Endpoint &exit_ep = track.reverse().endpoint();
 181                                 if(entry_ep.has_common_paths(exit_ep))
 182                                 {
 183                                         unsigned mask = entry_ep.paths&exit_ep.paths;
 184                                         for(path=0; mask>1; ++path, mask>>=1) ;
 185
 186                                         track->set_active_path(path);
 187                                         if(track->is_path_changing())
 188                                         {
 189                                                 pending_block = &*block;
 190                                                 break;
 191                                         }
 192                                 }
 193                                 else
 194                                         // XXX Do something here
 195                                         break;
 196                         }
 197                 }
 198
 199                 if(&*block==stop_at_block)
 200                         break;
 201
 202                 if(block->get_sensor_id())
 203                         ++nsens;
 204                 if(nsens>0)
 205                         dist += block->get_path_length(block.entry());
 206         }
 207
 208         // Make any sensorless blocks at the beginning immediately current
 209         while(cur_blocks_end!=blocks.end() && !(*cur_blocks_end)->get_sensor_id())
 210                 ++cur_blocks_end;
 211 }
 212
 213 bool BlockAllocator::reserve_block(const BlockIter &block)
 214 {
 215         /* Add it to the list first to present a consistent state in block_reserved
 216         signal. */
 217         blocks.push_back(block);
 218         try
 219         {
 220                 if(!block->reserve(&train))
 221                 {
 222                         blocks.pop_back();
 223                         return false;
 224                 }
 225
 226                 return true;
 227         }
 228         catch(...)
 229         {
 230                 blocks.pop_back();
 231                 throw;
 232         }
 233 }
 234
 235 bool BlockAllocator::release_from(const Block &block)
 236 {
 237         bool have_sensor = false;
 238         for(BlockList::iterator i=cur_blocks_end; i!=blocks.end(); ++i)
 239         {
 240                 if(i->block()==&block)
 241                 {
 242                         if(have_sensor)
 243                                 release_blocks_end(i);
 244                         return have_sensor;
 245                 }
 246                 else if((*i)->get_sensor_id())
 247                         have_sensor = true;
 248         }
 249
 250         return false;
 251 }
 252
 253 void BlockAllocator::release_noncurrent()
 254 {
 255         release_blocks_end(cur_blocks_end);
 256 }
 257
 258 void BlockAllocator::release_blocks_begin(const BlockList::iterator &end)
 259 {
 260         for(BlockList::iterator i=blocks.begin(); i!=end; )
 261                 release_block(i++);
 262 }
 263
 264 void BlockAllocator::release_blocks_end(const BlockList::iterator &begin)
 265 {
 266         // Guard against decrementing blocks.begin()
 267         if(begin==blocks.begin())
 268                 return release_blocks_begin(blocks.end());
 269
 270         /* Release the blocks in reverse order so that a consistent state is
 271         presented in block_reserved signal. */
 272         bool done = false;
 273         for(BlockList::iterator i=blocks.end(); !done; )
 274         {
 275                 done = (i==begin);
 276                 release_block(i--);
 277         }
 278 }
 279
 280 void BlockAllocator::release_block(const BlockList::iterator &i)
 281 {
 282         if(i==cur_blocks_end)
 283                 ++cur_blocks_end;
 284         if(&**i==pending_block)
 285                 pending_block = 0;
 286
 287         Block &block = **i;
 288         blocks.erase(i);
 289         block.reserve(0);
 290 }
 291
 292 void BlockAllocator::reverse()
 293 {
 294         release_noncurrent();
 295         blocks.reverse();
 296         for(BlockList::iterator i=blocks.begin(); i!=blocks.end(); ++i)
 297                 *i = i->reverse();
 298 }
 299
 300 void BlockAllocator::turnout_path_changed(Track &track)
 301 {
 302         if(&track.get_block()==pending_block && !reserving)
 303                 reserve_more();
 304 }
 305
 306 void BlockAllocator::block_reserved(Block &block, const Train *tr)
 307 {
 308         if(&block==pending_block && !tr && !reserving)
 309                 reserve_more();
 310 }
 311
 312 void BlockAllocator::sensor_state_changed(Sensor &sensor, Sensor::State state)
 313 {
 314         Block *block = 0;
 315         if(TrackCircuit *tc = dynamic_cast<TrackCircuit *>(&sensor))
 316                 block = &tc->get_block();
 317         else
 318                 return;
 319
 320         if(block->get_train()!=&train)
 321                 return;
 322
 323         if(state==Sensor::MAYBE_ACTIVE)
 324         {
 325                 // Find the first sensor block from our reserved blocks that isn't this sensor
 326                 BlockList::iterator end;
 327                 unsigned result = 0;
 328                 for(end=cur_blocks_end; end!=blocks.end(); ++end)
 329                         if((*end)->get_sensor_id())
 330                         {
 331                                 if(&**end!=block)
 332                                 {
 333                                         if(result==0)
 334                                                 result = 2;
 335                                         else if(result==1)
 336                                                 break;
 337                                 }
 338                                 else if(result==0)
 339                                         result = 1;
 340                                 else if(result==2)
 341                                         result = 3;
 342                         }
 343
 344                 if(result==1)
 345                 {
 346                         // Move blocks up to the next sensor to our current blocks
 347                         for(BlockList::iterator j=cur_blocks_end; j!=end; ++j)
 348                                 train.signal_advanced.emit(**j);
 349                         cur_blocks_end = end;
 350                 }
 351                 else if(result==3)
 352                         train.get_layout().emergency("Sensor for "+train.get_name()+" triggered out of order");
 353         }
 354         else if(state==Sensor::INACTIVE)
 355         {
 356                 const Vehicle &veh = train.get_vehicle(train.get_controller().get_reverse() ? 0 : train.get_n_vehicles()-1);
 357                 const Block &veh_block = veh.get_track()->get_block();
 358                 const Driver &driver = train.get_layout().get_driver();
 359
 360                 /* Sensors aren't guaranteed to be detriggered in order.  Go through the
 361                 block list and locate the first sensor that's still active. */
 362                 BlockList::iterator end = blocks.end();
 363                 for(BlockList::iterator i=blocks.begin(); i!=cur_blocks_end; ++i)
 364                 {
 365                         // Avoid freeing blocks that still hold the train's vehicles
 366                         if(&**i==&veh_block)
 367                                 break;
 368
 369                         if((*i)->get_sensor_id())
 370                         {
 371                                 if(driver.get_sensor((*i)->get_sensor_id()))
 372                                         break;
 373                                 else
 374                                         end = i;
 375                         }
 376                 }
 377
 378                 if(end!=blocks.end())
 379                         // Free blocks up to the last inactive sensor
 380                         release_blocks_begin(++end);
 381         }
 382 }
 383
 384 void BlockAllocator::save(list<DataFile::Statement> &st) const
 385 {
 386         if(!blocks.empty() && cur_blocks_end!=blocks.begin())
 387         {
 388                 BlockList cur_blocks(blocks.begin(), BlockList::const_iterator(cur_blocks_end));
 389                 BlockIter prev;
 390                 if(train.get_controller().get_reverse())
 391                 {
 392                         cur_blocks.reverse();
 393                         prev = cur_blocks.front().next();
 394                 }
 395                 else
 396                         prev = cur_blocks.front().flip();
 397
 398                 st.push_back((DataFile::Statement("hint"), prev->get_id()));
 399
 400                 for(BlockList::const_iterator i=cur_blocks.begin(); i!=cur_blocks.end(); ++i)
 401                         st.push_back((DataFile::Statement("block"), (*i)->get_id()));
 402         }
 403 }
 404
 405
 406 BlockAllocator::Loader::Loader(BlockAllocator &ba):
 407         DataFile::ObjectLoader<BlockAllocator>(ba),
 408         valid(true)
 409 {
 410         add("block", &Loader::block);
 411         add("hint",  &Loader::hint);
 412 }
 413
 414 void BlockAllocator::Loader::block(unsigned id)
 415 {
 416         if(!valid)
 417                 return;
 418
 419         Block *blk;
 420         try
 421         {
 422                 blk = &obj.train.get_layout().get_block(id);
 423         }
 424         catch(const key_error &)
 425         {
 426                 valid = false;
 427                 return;
 428         }
 429
 430         int entry = -1;
 431         if(prev_block)
 432                 entry = blk->get_endpoint_by_link(*prev_block);
 433         if(entry<0)
 434                 entry = 0;
 435
 436         obj.blocks.push_back(BlockIter(blk, entry));
 437         blk->reserve(&obj.train);
 438
 439         if(blk->get_sensor_id())
 440                 obj.train.get_layout().get_driver().set_sensor(blk->get_sensor_id(), true);
 441
 442         prev_block = blk;
 443 }
 444
 445 void BlockAllocator::Loader::hint(unsigned id)
 446 {
 447         try
 448         {
 449                 prev_block = &obj.train.get_layout().get_block(id);
 450         }
 451         catch(const key_error &)
 452         {
 453                 valid = false;
 454         }
 455 }
 456
 457 } // namespace R2C2