src/Traffic/TrafficMgr.cxx

   1 /******************************************************************************
   2  * TrafficMGr.cxx
   3  * Written by Durk Talsma, started May 5, 2004.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  *
  19  *
  20  **************************************************************************/
  21
  22 /*
  23  * Traffic manager parses airlines timetable-like data and uses this to
  24  * determine the approximate position of each AI aircraft in its database.
  25  * When an AI aircraft is close to the user's position, a more detailed
  26  * AIModels based simulation is set up.
  27  *
  28  * I'm currently assuming the following simplifications:
  29  * 1) The earth is a perfect sphere
  30  * 2) Each aircraft flies a perfect great circle route.
  31  * 3) Each aircraft flies at a constant speed (with infinite accelerations and
  32  *    decelerations)
  33  * 4) Each aircraft leaves at exactly the departure time.
  34  * 5) Each aircraft arrives at exactly the specified arrival time.
  35  *
  36  *
  37  *****************************************************************************/
  38
  39 #ifdef HAVE_CONFIG_H
  40 #  include "config.h"
  41 #endif
  42
  43 #include <stdlib.h>
  44 #include <time.h>
  45 #include <cstring>
  46 #include <iostream>
  47 #include <fstream>
  48
  49
  50 #include <string>
  51 #include <vector>
  52 #include <algorithm>
  53 #include <boost/foreach.hpp>
  54
  55 #include <simgear/compiler.h>
  56 #include <simgear/misc/sg_path.hxx>
  57 #include <simgear/misc/sg_dir.hxx>
  58 #include <simgear/props/props.hxx>
  59 #include <simgear/structure/subsystem_mgr.hxx>
  60 #include <simgear/xml/easyxml.hxx>
  61 #include <simgear/threads/SGThread.hxx>
  62 #include <simgear/threads/SGGuard.hxx>
  63
  64 #include <AIModel/AIAircraft.hxx>
  65 #include <AIModel/AIFlightPlan.hxx>
  66 #include <AIModel/AIBase.hxx>
  67 #include <Airports/simple.hxx>
  68 #include <Main/fg_init.hxx>
  69
  70
  71
  72 #include "TrafficMgr.hxx"
  73
  74 using std::sort;
  75 using std::strcmp;
  76
  77 /**
  78  * Thread encapsulating parsing the traffic schedules.
  79  */
  80 class ScheduleParseThread : public SGThread
  81 {
  82 public:
  83   ScheduleParseThread(FGTrafficManager* traffic) :
  84     _trafficManager(traffic),
  85     _isFinished(false),
  86     _cancelThread(false)
  87   {
  88
  89   }
  90
  91   // if we're destroyed while running, ensure the thread exits cleanly
  92   ~ScheduleParseThread()
  93   {
  94     _lock.lock();
  95     if (!_isFinished) {
  96       _cancelThread = true; // request cancellation so we don't wait ages
  97       _lock.unlock();
  98       join();
  99     } else {
 100       _lock.unlock();
 101     }
 102   }
 103
 104   void setTrafficDir(const SGPath& trafficDirPath)
 105   {
 106     _trafficDirPath = trafficDirPath;
 107   }
 108
 109   bool isFinished() const
 110   {
 111     SGGuard<SGMutex> g(_lock);
 112     return _isFinished;
 113   }
 114
 115   virtual void run()
 116   {
 117     SGTimeStamp st;
 118     st.stamp();
 119
 120     simgear::Dir trafficDir(_trafficDirPath);
 121     simgear::PathList d = trafficDir.children(simgear::Dir::TYPE_DIR | simgear::Dir::NO_DOT_OR_DOTDOT);
 122
 123     BOOST_FOREACH(SGPath p, d) {
 124       simgear::Dir d2(p);
 125       simgear::PathList trafficFiles = d2.children(simgear::Dir::TYPE_FILE, ".xml");
 126       BOOST_FOREACH(SGPath xml, trafficFiles) {
 127         _trafficManager->parseSchedule(xml);
 128         if (_cancelThread) {
 129           return;
 130         }
 131       }
 132     } // of sub-directories in AI/Traffic iteration
 133
 134   //  _trafficManager->parseSchedules(schedulesToRead);
 135     SG_LOG(SG_AI, SG_INFO, "parsing traffic schedules took:" << st.elapsedMSec() << "msec");
 136
 137     SGGuard<SGMutex> g(_lock);
 138     _isFinished = true;
 139   }
 140 private:
 141   FGTrafficManager* _trafficManager;
 142   mutable SGMutex _lock;
 143   bool _isFinished;
 144   bool _cancelThread;
 145   SGPath _trafficDirPath;
 146 };
 147
 148 /******************************************************************************
 149  * TrafficManager
 150  *****************************************************************************/
 151 FGTrafficManager::FGTrafficManager() :
 152   inited(false),
 153   doingInit(false),
 154   enabled("/sim/traffic-manager/enabled"),
 155   aiEnabled("/sim/ai/enabled"),
 156   realWxEnabled("/environment/realwx/enabled"),
 157   metarValid("/environment/metar/valid")
 158 {
 159     //score = 0;
 160     //runCount = 0;
 161     acCounter = 0;
 162 }
 163
 164 FGTrafficManager::~FGTrafficManager()
 165 {
 166     shutdown();
 167 }
 168
 169 void FGTrafficManager::shutdown()
 170 {
 171     if (!inited) {
 172       if (doingInit) {
 173         scheduleParser.reset();
 174         doingInit = false;
 175       }
 176
 177       return;
 178     }
 179
 180     // Save the heuristics data
 181     bool saveData = false;
 182     ofstream cachefile;
 183     if (fgGetBool("/sim/traffic-manager/heuristics")) {
 184         SGPath cacheData(globals->get_fg_home());
 185         cacheData.append("ai");
 186         string airport = fgGetString("/sim/presets/airport-id");
 187
 188         if ((airport) != "") {
 189             char buffer[128];
 190             ::snprintf(buffer, 128, "%c/%c/%c/",
 191                        airport[0], airport[1], airport[2]);
 192             cacheData.append(buffer);
 193             if (!cacheData.exists()) {
 194                 cacheData.create_dir(0777);
 195             }
 196             cacheData.append(airport + "-cache.txt");
 197             //cerr << "Saving AI traffic heuristics" << endl;
 198             saveData = true;
 199             cachefile.open(cacheData.str().c_str());
 200             cachefile << "[TrafficManagerCachedata:ref:2011:09:04]" << endl;
 201         }
 202     }
 203     for (ScheduleVectorIterator sched = scheduledAircraft.begin();
 204          sched != scheduledAircraft.end(); sched++) {
 205         if (saveData) {
 206             cachefile << (*sched)->getRegistration() << " "
 207                 << (*sched)->getRunCount() << " "
 208                 << (*sched)->getHits() << " "
 209                 << (*sched)->getLastUsed() << endl;
 210         }
 211         delete(*sched);
 212     }
 213     if (saveData) {
 214         cachefile.close();
 215     }
 216     scheduledAircraft.clear();
 217     flights.clear();
 218     releaseList.clear();
 219
 220     currAircraft = scheduledAircraft.begin();
 221     doingInit = false;
 222     inited = false;
 223 }
 224
 225 /// caution - this is run on the helper thread to improve startup
 226 /// responsiveness - do not access properties or global state from
 227 /// here, since there's no locking protection at all
 228 void FGTrafficManager::parseSchedule(const SGPath& path)
 229 {
 230   readXML(path.str(), *this);
 231 }
 232
 233 void FGTrafficManager::init()
 234 {
 235     if (!enabled) {
 236       return;
 237     }
 238
 239     assert(!doingInit);
 240     doingInit = true;
 241     if (string(fgGetString("/sim/traffic-manager/datafile")) == string("")) {
 242         scheduleParser.reset(new ScheduleParseThread(this));
 243         scheduleParser->setTrafficDir(SGPath(globals->get_fg_root(), "AI/Traffic"));
 244         scheduleParser->start();
 245     } else {
 246         fgSetBool("/sim/traffic-manager/heuristics", false);
 247         SGPath path = string(fgGetString("/sim/traffic-manager/datafile"));
 248         string ext = path.extension();
 249         if (path.extension() == "xml") {
 250             if (path.exists()) {
 251                 readXML(path.str(), *this);
 252             }
 253         } else if (path.extension() == "conf") {
 254             if (path.exists()) {
 255                 readTimeTableFromFile(path);
 256             }
 257         } else {
 258              SG_LOG(SG_AI, SG_ALERT,
 259                                "Unknown data format " << path.str()
 260                                 << " for traffic");
 261         }
 262         //exit(1);
 263     }
 264 }
 265
 266
 267
 268 void FGTrafficManager::finishInit()
 269 {
 270     assert(doingInit);
 271     SG_LOG(SG_AI, SG_INFO, "finishing AI-Traffic init");
 272     loadHeuristics();
 273
 274     // Do sorting and scoring separately, to take advantage of the "homeport| variable
 275     for (currAircraft = scheduledAircraft.begin();
 276          currAircraft != scheduledAircraft.end(); currAircraft++) {
 277         (*currAircraft)->setScore();
 278     }
 279
 280     sort(scheduledAircraft.begin(), scheduledAircraft.end(),
 281          compareSchedules);
 282     currAircraft = scheduledAircraft.begin();
 283     currAircraftClosest = scheduledAircraft.begin();
 284
 285     doingInit = false;
 286     inited = true;
 287 }
 288
 289 void FGTrafficManager::loadHeuristics()
 290 {
 291     if (!fgGetBool("/sim/traffic-manager/heuristics")) {
 292         return;
 293     }
 294
 295     HeuristicMap heurMap;
 296     //cerr << "Processing Heuristics" << endl;
 297     // Load the heuristics data
 298     SGPath cacheData(globals->get_fg_home());
 299     cacheData.append("ai");
 300     string airport = fgGetString("/sim/presets/airport-id");
 301     if ((airport) != "") {
 302       char buffer[128];
 303       ::snprintf(buffer, 128, "%c/%c/%c/",
 304                  airport[0], airport[1], airport[2]);
 305       cacheData.append(buffer);
 306       cacheData.append(airport + "-cache.txt");
 307       string revisionStr;
 308       if (cacheData.exists()) {
 309         ifstream data(cacheData.c_str());
 310         data >> revisionStr;
 311         if (revisionStr != "[TrafficManagerCachedata:ref:2011:09:04]") {
 312           SG_LOG(SG_GENERAL, SG_ALERT,"Traffic Manager Warning: discarding outdated cachefile " <<
 313                  cacheData.c_str() << " for Airport " << airport);
 314         } else {
 315           while (1) {
 316             Heuristic h; // = new Heuristic;
 317             data >> h.registration >> h.runCount >> h.hits >> h.lastRun;
 318             if (data.eof())
 319               break;
 320             HeuristicMapIterator itr = heurMap.find(h.registration);
 321             if (itr != heurMap.end()) {
 322               SG_LOG(SG_GENERAL, SG_WARN,"Traffic Manager Warning: found duplicate tailnumber " <<
 323                      h.registration << " for AI aircraft");
 324             } else {
 325               heurMap[h.registration] = h;
 326             }
 327           }
 328         }
 329       }
 330     }
 331
 332   for(currAircraft = scheduledAircraft.begin(); currAircraft != scheduledAircraft.end(); ++currAircraft) {
 333         string registration = (*currAircraft)->getRegistration();
 334         HeuristicMapIterator itr = heurMap.find(registration);
 335         if (itr != heurMap.end()) {
 336             (*currAircraft)->setrunCount(itr->second.runCount);
 337             (*currAircraft)->setHits(itr->second.hits);
 338             (*currAircraft)->setLastUsed(itr->second.lastRun);
 339         }
 340     }
 341 }
 342
 343 void FGTrafficManager::update(double /*dt */ )
 344 {
 345     if (!enabled)
 346     {
 347         if (inited || doingInit)
 348             shutdown();
 349         return;
 350     }
 351
 352     if ((realWxEnabled && !metarValid)) {
 353         return;
 354     }
 355
 356     if (!aiEnabled)
 357     {
 358         // traffic depends on AI module
 359         aiEnabled = true;
 360     }
 361
 362     if (!inited) {
 363         if (!doingInit) {
 364             init();
 365         }
 366
 367         if (!scheduleParser->isFinished()) {
 368           return;
 369         }
 370
 371         finishInit();
 372     }
 373
 374     time_t now = time(NULL) + fgGetLong("/sim/time/warp");
 375     if (scheduledAircraft.size() == 0) {
 376         return;
 377     }
 378
 379     SGVec3d userCart = globals->get_aircraft_position_cart();
 380
 381     if (currAircraft == scheduledAircraft.end()) {
 382         currAircraft = scheduledAircraft.begin();
 383     }
 384     //cerr << "Processing << " << (*currAircraft)->getRegistration() << " with score " << (*currAircraft)->getScore() << endl;
 385     if (!((*currAircraft)->update(now, userCart))) {
 386         (*currAircraft)->taint();
 387     }
 388     currAircraft++;
 389 }
 390
 391 void FGTrafficManager::release(int id)
 392 {
 393     releaseList.push_back(id);
 394 }
 395
 396 bool FGTrafficManager::isReleased(int id)
 397 {
 398     IdListIterator i = releaseList.begin();
 399     while (i != releaseList.end()) {
 400         if ((*i) == id) {
 401             releaseList.erase(i);
 402             return true;
 403         }
 404         i++;
 405     }
 406     return false;
 407 }
 408
 409
 410 void FGTrafficManager::readTimeTableFromFile(SGPath infileName)
 411 {
 412     string model;
 413     string livery;
 414     string homePort;
 415     string registration;
 416     string flightReq;
 417     bool   isHeavy;
 418     string acType;
 419     string airline;
 420     string m_class;
 421     string FlightType;
 422     double radius;
 423     double offset;
 424
 425     char buffer[256];
 426     string buffString;
 427     vector <string> tokens, depTime,arrTime;
 428     vector <string>::iterator it;
 429     ifstream infile(infileName.str().c_str());
 430     while (1) {
 431          infile.getline(buffer, 256);
 432          if (infile.eof()) {
 433              break;
 434          }
 435          //cerr << "Read line : " << buffer << endl;
 436          buffString = string(buffer);
 437          tokens.clear();
 438          Tokenize(buffString, tokens, " \t");
 439          //for (it = tokens.begin(); it != tokens.end(); it++) {
 440          //    cerr << "Tokens: " << *(it) << endl;
 441          //}
 442          //cerr << endl;
 443          if (!tokens.empty()) {
 444              if (tokens[0] == string("AC")) {
 445                  if (tokens.size() != 13) {
 446                      SG_LOG(SG_GENERAL, SG_ALERT, "Error parsing traffic file " << infileName.str() << " at " << buffString);
 447                      exit(1);
 448                  }
 449                  model          = tokens[12];
 450                  livery         = tokens[6];
 451                  homePort       = tokens[1];
 452                  registration   = tokens[2];
 453                  if (tokens[11] == string("false")) {
 454                      isHeavy = false;
 455                  } else {
 456                      isHeavy = true;
 457                  }
 458                  acType         = tokens[4];
 459                  airline        = tokens[5];
 460                  flightReq      = tokens[3] + tokens[5];
 461                  m_class        = tokens[10];
 462                  FlightType     = tokens[9];
 463                  radius         = atof(tokens[8].c_str());
 464                  offset         = atof(tokens[7].c_str());;
 465
 466                  if (!FGAISchedule::validModelPath(model)) {
 467                      SG_LOG(SG_GENERAL, SG_WARN, "TrafficMgr: Missing model path:" <<
 468                             model << " from " << infileName.str());
 469                  } else {
 470
 471                  SG_LOG(SG_GENERAL, SG_INFO, "Adding Aircraft" << model << " " << livery << " " << homePort << " "
 472                                                                 << registration << " " << flightReq << " " << isHeavy
 473                                                                 << " " << acType << " " << airline << " " << m_class
 474                                                                 << " " << FlightType << " " << radius << " " << offset);
 475                  scheduledAircraft.push_back(new FGAISchedule(model,
 476                                                               livery,
 477                                                               homePort,
 478                                                               registration,
 479                                                               flightReq,
 480                                                               isHeavy,
 481                                                               acType,
 482                                                               airline,
 483                                                               m_class,
 484                                                               FlightType,
 485                                                               radius,
 486                                                               offset));
 487                  } // of valid model path
 488              }
 489              if (tokens[0] == string("FLIGHT")) {
 490                  //cerr << "Found flight " << buffString << " size is : " << tokens.size() << endl;
 491                  if (tokens.size() != 10) {
 492                      SG_LOG(SG_GENERAL, SG_ALERT, "Error parsing traffic file " << infileName.str() << " at " << buffString);
 493                      exit(1);
 494                  }
 495                  string callsign = tokens[1];
 496                  string fltrules = tokens[2];
 497                  string weekdays = tokens[3];
 498                  string departurePort = tokens[5];
 499                  string arrivalPort   = tokens[7];
 500                  int    cruiseAlt     = atoi(tokens[8].c_str());
 501                  string depTimeGen    = tokens[4];
 502                  string arrTimeGen    = tokens[6];
 503                  string repeat        = "WEEK";
 504                  string requiredAircraft = tokens[9];
 505
 506                  if (weekdays.size() != 7) {
 507                      SG_LOG(SG_GENERAL, SG_ALERT, "Found misconfigured weekdays string" << weekdays);
 508                      exit(1);
 509                  }
 510                  depTime.clear();
 511                  arrTime.clear();
 512                  Tokenize(depTimeGen, depTime, ":");
 513                  Tokenize(arrTimeGen, arrTime, ":");
 514                  double dep = atof(depTime[0].c_str()) + (atof(depTime[1].c_str()) / 60.0);
 515                  double arr = atof(arrTime[0].c_str()) + (atof(arrTime[1].c_str()) / 60.0);
 516                  //cerr << "Using " << dep << " " << arr << endl;
 517                  bool arrivalWeekdayNeedsIncrement = false;
 518                  if (arr < dep) {
 519                        arrivalWeekdayNeedsIncrement = true;
 520                  }
 521                  for (int i = 0; i < 7; i++) {
 522                      int j = i+1;
 523                      if (weekdays[i] != '.') {
 524                          char buffer[4];
 525                          snprintf(buffer, 4, "%d/", j);
 526                          string departureTime = string(buffer) + depTimeGen + string(":00");
 527                          string arrivalTime;
 528                          if (!arrivalWeekdayNeedsIncrement) {
 529                              arrivalTime   = string(buffer) + arrTimeGen + string(":00");
 530                          }
 531                          if (arrivalWeekdayNeedsIncrement && i != 6 ) {
 532                              snprintf(buffer, 4, "%d/", j+1);
 533                              arrivalTime   = string(buffer) + arrTimeGen + string(":00");
 534                          }
 535                          if (arrivalWeekdayNeedsIncrement && i == 6 ) {
 536                              snprintf(buffer, 4, "%d/", 0);
 537                              arrivalTime   = string(buffer) + arrTimeGen  + string(":00");
 538                          }
 539                          SG_LOG(SG_GENERAL, SG_ALERT, "Adding flight " << callsign       << " "
 540                                                       << fltrules       << " "
 541                                                       <<  departurePort << " "
 542                                                       <<  arrivalPort   << " "
 543                                                       <<  cruiseAlt     << " "
 544                                                       <<  departureTime << " "
 545                                                       <<  arrivalTime   << " "
 546                                                       << repeat        << " "
 547                                                       <<  requiredAircraft);
 548
 549                          flights[requiredAircraft].push_back(new FGScheduledFlight(callsign,
 550                                                                  fltrules,
 551                                                                  departurePort,
 552                                                                  arrivalPort,
 553                                                                  cruiseAlt,
 554                                                                  departureTime,
 555                                                                  arrivalTime,
 556                                                                  repeat,
 557                                                                  requiredAircraft));
 558                     }
 559                 }
 560              }
 561          }
 562
 563     }
 564     //exit(1);
 565 }
 566
 567
 568 void FGTrafficManager::Tokenize(const string& str,
 569                       vector<string>& tokens,
 570                       const string& delimiters)
 571 {
 572     // Skip delimiters at beginning.
 573     string::size_type lastPos = str.find_first_not_of(delimiters, 0);
 574     // Find first "non-delimiter".
 575     string::size_type pos     = str.find_first_of(delimiters, lastPos);
 576
 577     while (string::npos != pos || string::npos != lastPos)
 578     {
 579         // Found a token, add it to the vector.
 580         tokens.push_back(str.substr(lastPos, pos - lastPos));
 581         // Skip delimiters.  Note the "not_of"
 582         lastPos = str.find_first_not_of(delimiters, pos);
 583         // Find next "non-delimiter"
 584         pos = str.find_first_of(delimiters, lastPos);
 585     }
 586 }
 587
 588
 589 void FGTrafficManager::startXML()
 590 {
 591     //cout << "Start XML" << endl;
 592     requiredAircraft = "";
 593     homePort = "";
 594 }
 595
 596 void FGTrafficManager::endXML()
 597 {
 598     //cout << "End XML" << endl;
 599 }
 600
 601 void FGTrafficManager::startElement(const char *name,
 602                                     const XMLAttributes & atts)
 603 {
 604     const char *attval;
 605     //cout << "Start element " << name << endl;
 606     //FGTrafficManager temp;
 607     //for (int i = 0; i < atts.size(); i++)
 608     //  if (string(atts.getName(i)) == string("include"))
 609     attval = atts.getValue("include");
 610     if (attval != 0) {
 611         //cout << "including " << attval << endl;
 612         SGPath path = globals->get_fg_root();
 613         path.append("/Traffic/");
 614         path.append(attval);
 615         readXML(path.str(), *this);
 616     }
 617     elementValueStack.push_back("");
 618     //  cout << "  " << atts.getName(i) << '=' << atts.getValue(i) << endl;
 619 }
 620
 621 void FGTrafficManager::endElement(const char *name)
 622 {
 623     //cout << "End element " << name << endl;
 624     const string & value = elementValueStack.back();
 625
 626     if (!strcmp(name, "model"))
 627         mdl = value;
 628     else if (!strcmp(name, "livery"))
 629         livery = value;
 630     else if (!strcmp(name, "home-port"))
 631         homePort = value;
 632     else if (!strcmp(name, "registration"))
 633         registration = value;
 634     else if (!strcmp(name, "airline"))
 635         airline = value;
 636     else if (!strcmp(name, "actype"))
 637         acType = value;
 638     else if (!strcmp(name, "required-aircraft"))
 639         requiredAircraft = value;
 640     else if (!strcmp(name, "flighttype"))
 641         flighttype = value;
 642     else if (!strcmp(name, "radius"))
 643         radius = atoi(value.c_str());
 644     else if (!strcmp(name, "offset"))
 645         offset = atoi(value.c_str());
 646     else if (!strcmp(name, "performance-class"))
 647         m_class = value;
 648     else if (!strcmp(name, "heavy")) {
 649         if (value == string("true"))
 650             heavy = true;
 651         else
 652             heavy = false;
 653     } else if (!strcmp(name, "callsign"))
 654         callsign = value;
 655     else if (!strcmp(name, "fltrules"))
 656         fltrules = value;
 657     else if (!strcmp(name, "port"))
 658         port = value;
 659     else if (!strcmp(name, "time"))
 660         timeString = value;
 661     else if (!strcmp(name, "departure")) {
 662         departurePort = port;
 663         departureTime = timeString;
 664     } else if (!strcmp(name, "cruise-alt"))
 665         cruiseAlt = atoi(value.c_str());
 666     else if (!strcmp(name, "arrival")) {
 667         arrivalPort = port;
 668         arrivalTime = timeString;
 669     } else if (!strcmp(name, "repeat"))
 670         repeat = value;
 671     else if (!strcmp(name, "flight")) {
 672         // We have loaded and parsed all the information belonging to this flight
 673         // so we temporarily store it.
 674         //cerr << "Pusing back flight " << callsign << endl;
 675         //cerr << callsign  <<  " " << fltrules     << " "<< departurePort << " " <<  arrivalPort << " "
 676         //   << cruiseAlt <<  " " << departureTime<< " "<< arrivalTime   << " " << repeat << endl;
 677
 678         //Prioritize aircraft
 679         string apt = fgGetString("/sim/presets/airport-id");
 680         //cerr << "Airport information: " << apt << " " << departurePort << " " << arrivalPort << endl;
 681         //if (departurePort == apt) score++;
 682         //flights.push_back(new FGScheduledFlight(callsign,
 683         //                                fltrules,
 684         //                                departurePort,
 685         //                                arrivalPort,
 686         //                                cruiseAlt,
 687         //                                departureTime,
 688         //                                arrivalTime,
 689         //                                repeat));
 690         if (requiredAircraft == "") {
 691             char buffer[16];
 692             snprintf(buffer, 16, "%d", acCounter);
 693             requiredAircraft = buffer;
 694         }
 695         SG_LOG(SG_GENERAL, SG_DEBUG, "Adding flight: " << callsign << " "
 696                << fltrules << " "
 697                << departurePort << " "
 698                << arrivalPort << " "
 699                << cruiseAlt << " "
 700                << departureTime << " "
 701                << arrivalTime << " " << repeat << " " << requiredAircraft);
 702         // For database maintainance purposes, it may be convenient to
 703         //
 704         if (fgGetBool("/sim/traffic-manager/dumpdata") == true) {
 705              SG_LOG(SG_GENERAL, SG_ALERT, "Traffic Dump FLIGHT," << callsign << ","
 706                           << fltrules << ","
 707                           << departurePort << ","
 708                           << arrivalPort << ","
 709                           << cruiseAlt << ","
 710                           << departureTime << ","
 711                           << arrivalTime << "," << repeat << "," << requiredAircraft);
 712         }
 713         flights[requiredAircraft].push_back(new FGScheduledFlight(callsign,
 714                                                                   fltrules,
 715                                                                   departurePort,
 716                                                                   arrivalPort,
 717                                                                   cruiseAlt,
 718                                                                   departureTime,
 719                                                                   arrivalTime,
 720                                                                   repeat,
 721                                                                   requiredAircraft));
 722         requiredAircraft = "";
 723     } else if (!strcmp(name, "aircraft")) {
 724         endAircraft();
 725     }
 726
 727     elementValueStack.pop_back();
 728 }
 729
 730 void FGTrafficManager::endAircraft()
 731 {
 732     string isHeavy = heavy ? "true" : "false";
 733
 734     if (missingModels.find(mdl) != missingModels.end()) {
 735     // don't stat() or warn again
 736         requiredAircraft = homePort = "";
 737         return;
 738     }
 739
 740     if (!FGAISchedule::validModelPath(mdl)) {
 741         missingModels.insert(mdl);
 742         SG_LOG(SG_GENERAL, SG_WARN, "TrafficMgr: Missing model path:" << mdl);
 743         requiredAircraft = homePort = "";
 744         return;
 745     }
 746
 747     int proportion =
 748         (int) (fgGetDouble("/sim/traffic-manager/proportion") * 100);
 749     int randval = rand() & 100;
 750     if (randval > proportion) {
 751         requiredAircraft = homePort = "";
 752         return;
 753     }
 754
 755     if (fgGetBool("/sim/traffic-manager/dumpdata") == true) {
 756         SG_LOG(SG_GENERAL, SG_ALERT, "Traffic Dump AC," << homePort << "," << registration << "," << requiredAircraft
 757                << "," << acType << "," << livery << ","
 758                << airline << ","  << m_class << "," << offset << "," << radius << "," << flighttype << "," << isHeavy << "," << mdl);
 759     }
 760
 761     if (requiredAircraft == "") {
 762         char buffer[16];
 763         snprintf(buffer, 16, "%d", acCounter);
 764         requiredAircraft = buffer;
 765     }
 766     if (homePort == "") {
 767         homePort = departurePort;
 768     }
 769
 770     scheduledAircraft.push_back(new FGAISchedule(mdl,
 771                                                  livery,
 772                                                  homePort,
 773                                                  registration,
 774                                                  requiredAircraft,
 775                                                  heavy,
 776                                                  acType,
 777                                                  airline,
 778                                                  m_class,
 779                                                  flighttype,
 780                                                  radius, offset));
 781
 782     acCounter++;
 783     requiredAircraft = "";
 784     homePort = "";
 785     SG_LOG(SG_GENERAL, SG_BULK, "Reading aircraft : "
 786            << registration << " with prioritization score " << score);
 787     score = 0;
 788 }
 789
 790 void FGTrafficManager::data(const char *s, int len)
 791 {
 792     string token = string(s, len);
 793     //cout << "Character data " << string(s,len) << endl;
 794     elementValueStack.back() += token;
 795 }
 796
 797 void FGTrafficManager::pi(const char *target, const char *data)
 798 {
 799     //cout << "Processing instruction " << target << ' ' << data << endl;
 800 }
 801
 802 void FGTrafficManager::warning(const char *message, int line, int column)
 803 {
 804     SG_LOG(SG_IO, SG_WARN,
 805            "Warning: " << message << " (" << line << ',' << column << ')');
 806 }
 807
 808 void FGTrafficManager::error(const char *message, int line, int column)
 809 {
 810     SG_LOG(SG_IO, SG_ALERT,
 811            "Error: " << message << " (" << line << ',' << column << ')');
 812 }