MSDriveWay.h

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/****************************************************************************/
// Eclipse SUMO, Simulation of Urban MObility; see https://eclipse.dev/sumo
// Copyright (C) 2002-2026 German Aerospace Center (DLR) and others.
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0/
// This Source Code may also be made available under the following Secondary
// Licenses when the conditions for such availability set forth in the Eclipse
// Public License 2.0 are satisfied: GNU General Public License, version 2
// or later which is available at
// https://www.gnu.org/licenses/old-licenses/gpl-2.0-standalone.html
// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
/****************************************************************************/
// A sequende of rail tracks (lanes) that may be used as a "set route" (Fahrstraße)
/****************************************************************************/
#pragma once
#include <config.h>
 
#include <utils/common/Named.h>
#include <microsim/MSMoveReminder.h>
#include <microsim/MSRoute.h>
#include <microsim/MSLink.h>
 
// ===========================================================================
// class declarations
// ===========================================================================
class SUMOVehicle;
class MSLane;
class MSRailSignal;
 
// ===========================================================================
// class definitions
// ===========================================================================
class MSDriveWay : public MSMoveReminder, public Named {
public:
    typedef std::pair<const SUMOVehicle* const, const MSLink::ApproachingVehicleInformation> Approaching;
    typedef std::set<const MSLane*, ComparatorNumericalIdLess> LaneSet;
    typedef std::map<const MSLane*, int, ComparatorNumericalIdLess> LaneVisitedMap;
 
    struct VehicleEvent {
        VehicleEvent(SUMOTime _time, bool _isEntry, const std::string& _id, Notification _reason):
            time(_time), isEntry(_isEntry), id(_id), reason(_reason) {}
        SUMOTime time;
        bool isEntry;
        std::string id;
        Notification reason;
    };
 
    /*  The driveways (Fahrstrassen) for each link index of MSRailSignal
     *  Each link index has at least one driveway
     *  A driveway describes one possible route that passes the signal up to
     *  the next secure point
     *  When a signal guards a switch (indirect guard) that signal stores two
     *  or more driveways
     */
    MSDriveWay(const MSLink* origin, const std::string& id, bool temporary = false);
 
    virtual ~MSDriveWay();
 
    static void cleanup();
 
    static void clearState();
 
    static bool haveDriveWays() {
        return myGlobalDriveWayIndex > 0;
    }
 
    static const MSDriveWay* retrieveDepartDriveWay(const MSEdge* edge, const std::string& id);
 
    bool notifyEnter(SUMOTrafficObject& veh, Notification reason, const MSLane* enteredLane);
    bool notifyLeave(SUMOTrafficObject& veh, double lastPos, Notification reason, const MSLane* enteredLane = 0);
    bool notifyLeaveBack(SUMOTrafficObject& veh, Notification reason, const MSLane* leftLane);
    bool notifyReroute(SUMOTrafficObject& veh);
 
    bool flankConflict(const MSDriveWay& other) const;
 
    bool crossingConflict(const MSDriveWay& other) const;
 
    bool bidiBlockedBy(const MSDriveWay& other) const;
 
    bool bidiBlockedByEnd(const MSDriveWay& other) const;
 
    bool forwardRouteConflict(std::set<const MSEdge*> forward, const MSDriveWay& other, bool secondCheck = false);
 
    bool conflictLaneOccupied(bool store = true, const SUMOVehicle* ego = nullptr) const;
 
    bool foeDriveWayOccupied(bool store, const SUMOVehicle* ego, MSEdgeVector& occupied) const;
 
    bool sidingDeadlock(const SUMOVehicle* veh) const;
 
    bool foeDriveWayApproached() const;
 
    bool reserve(const Approaching& closest, MSEdgeVector& occupied);
 
    void writeBlocks(OutputDevice& od) const;
    void writeBlockVehicles(OutputDevice& od) const;
 
    const std::vector<const MSEdge*>& getRoute() const {
        return myRoute;
    }
 
    const std::vector<const MSLane*>& getFlank() const {
        return myFlank;
    }
 
    const std::vector<const MSLane*>& getBidi() const {
        return myBidi;
    }
 
    const std::vector<MSLink*>& getConflictLinks() const {
        return myConflictLinks;
    }
 
    int getNumericalID() const {
        return myNumericalID;
    }
 
    const std::vector<VehicleEvent>& getEvents() const {
        return myVehicleEvents;
    }
 
    void setEvents(const std::vector<VehicleEvent>& events) {
        myVehicleEvents = events;
    }
 
    void setVehicle(const std::string& vehID) {
        myFirstVehicle = vehID;
    }
 
    const std::string& getFirstVehicle() const {
        return myFirstVehicle;
    }
 
    const std::vector<MSDriveWay*>& getFoes() const {
        return myFoes;
    }
 
    const std::vector<const MSLane*>& getForward() const {
        return myForward;
    }
 
    bool match(MSRouteIterator firstIt, MSRouteIterator endIt) const;
 
    void addDWDeadlock(const std::vector<const MSDriveWay*>& deadlockFoes);
 
    bool isDepartDriveway() const {
        return myOrigin == nullptr;
    };
 
    const MSLink* getOrigin() const {
        return myOrigin;
    }
 
    bool hasTrain(SUMOVehicle* veh) const;
 
    const std::vector<MSDriveWay*>& getSubDriveWays() const {
        return mySubDriveWays;
    }
 
    bool foundSignal() const {
        return myFoundSignal;
    }
 
    bool isSubDriveWay() const {
        return myParent != nullptr;
    }
 
    const MSDriveWay* getParent() const {
        return myParent;
    }
 
    double getParentRemainingLength() const;
 
    static void init();
 
    static bool hasRS(const MSEdge* cur, const MSEdge* next);
 
    static bool mustYield(const Approaching& veh, const Approaching& foe);
 
    static MSDriveWay* buildDriveWay(const std::string& id, const MSLink* link, MSRouteIterator first, MSRouteIterator end);
 
    static std::string getClickableTLLinkID(const MSLink* link);
 
    static const MSDriveWay* getDepartureDriveway(const SUMOVehicle* veh, bool init = false);
 
    static const std::vector<MSDriveWay*>& getEndingDriveWays(const MSEdge* edge);
 
    static void writeDepatureBlocks(OutputDevice& od, bool writeVehicles);
 
    static void saveState(OutputDevice& out);
    static void loadState(const SUMOSAXAttributes& attrs, int tag);
 
protected:
 
    int myNumericalID;
 
    const MSLink* myOrigin;
 
    const SUMOVehicle* myActive;
 
    std::vector<const MSEdge*> myRoute;
 
    int myCoreSize;
 
    int myForwardEdgeCount;
 
    bool myFoundSignal;
    bool myFoundJump;
    bool myTerminateRoute;
    bool myAbortedBuild;
    bool myBidiEnded;
    MSDriveWay* myParent;
 
    /* @brief the actual driveway part up to the next railsignal (halting position)
     * This must be free of other trains */
    std::vector<const MSLane*> myForward;
 
    /* @brief the list of bidirectional edges that can enter the forward
     * section and which must also be free of traffic
     * (up to the first element that could give protection) */
    std::vector<const MSLane*> myBidi;
 
    /* @brief the list of bidirectional edges that can enter the forward
     * section and which might contain deadlock-relevant traffic */
    std::vector<const MSLane*> myBidiExtended;
    std::vector<const MSLane*> myBidiExtendedSorted;
 
    /* @brief the list of edges that merge with the forward section
     * (found via backward search, up to the first element that could give protection) */
    std::vector<const MSLane*> myFlank;
 
    std::vector<const MSLane*> myConflictLanes;
 
    /* The conflict links for this block
     * Conflict resolution must be performed if vehicles are approaching the
     * current link and any of the conflict links */
    std::vector<MSLink*> myConflictLinks;
 
    bool hasLinkConflict(const Approaching& closest, const MSLink* foeLink) const;
 
    bool overlap(const MSDriveWay& other) const;
 
    /* @brief determine route that identifies this driveway (a subset of the
     * vehicle route)
     * collects:
     *   myRoute
     *   myForward
     *   myBidi
     *   myProtectedBidi
     *
     * returns edge that is assumed to safe from oncoming-deadlock or nullptr
     */
    void buildRoute(const MSLink* origin, MSRouteIterator next, MSRouteIterator end, LaneVisitedMap& visited, std::set<MSLink*, MSLink::ComparatorNumericalLaneIdLess>&);
 
    /* @brief find switches that threaten this driveway
     * @param[out] flankSwitches collect the switches
     */
    void checkFlanks(const MSLink* originLink, const std::vector<const MSLane*>& lanes, const LaneVisitedMap& visited,
                     bool allFoes, bool movingBlock, std::set<MSLink*, MSLink::ComparatorNumericalLaneIdLess>& flankSwitches) const;
 
    /* @brief find links that cross the driveway without entering it
     * @param[out] flankSwitches collect the switches
     */
    void checkCrossingFlanks(MSLink* dwLink, const LaneVisitedMap& visited, std::set<MSLink*, MSLink::ComparatorNumericalLaneIdLess>& flankSwitches) const;
 
    /* @brief find upstream protection from the given link
     * @param[out] flank: the stored flank lanes
     */
    void findFlankProtection(MSLink* link, MSLink* origLink, const std::vector<const MSLane*>& flank);
 
    void addFoes(const MSLink* link);
 
    void addSidings(MSDriveWay* foe, bool addToFoe = false);
 
    void addBidiFoes(const MSRailSignal* ownSignal, bool extended);
 
    void addParallelFoes(const MSLink* link, const MSEdge* first);
 
    void addReversalFoes(bool movingBlock);
 
    /* @brief build shortened driveway that ends where the foe train leaves the conflict zone of this driveway
     * @return whether the foe has received a new entry in myFoes
     */
    bool buildSubFoe(MSDriveWay* foe, bool movingBlock);
 
    void addConflictLink(const MSLink* link);
 
    std::pair<bool, const MSDriveWay*> canUseSiding(const SUMOVehicle* ego, const MSDriveWay* foe, const MSEdge* recurseSidingEnd = nullptr) const;
 
    const MSDriveWay* getFoeOrSubFoe(const MSDriveWay* dw) const;
 
    bool forwardEndOnRoute(const MSDriveWay* foe) const;
 
    void addSwitchFoes(MSLink* link);
 
    bool haveSubTrains() const;
 
    double getForwardDistance(int lastIndex) const;
 
    /* @brief whether the train would have matched this driveway in it's past
     * @return If matching, returns the number of edges the vehicle has gone past the start of the driveway,
     *         Indicate no-match by returning a negative value */
    int matchesPastRoute(SUMOVehicle& sveh) const;
 
    void enterDriveWay(SUMOVehicle& sveh, Notification reason);
 
    static bool hasJoin(const SUMOVehicle* ego, const SUMOVehicle* foe);
 
    static bool isSwitch(const MSLink* link);
 
    void _saveState(OutputDevice& out) const;
 
    static std::string getTLLinkID(const MSLink* link);
 
    static std::string getJunctionLinkID(const MSLink* link);
 
    static std::string formatVisitedMap(const LaneVisitedMap& visited);
 
    static void appendMapIndex(LaneVisitedMap& map, const MSLane* lane);
 
private:
 
    struct Siding {
        Siding(int s, int e, double l, std::vector<int> iEnds) : start(s), end(e), length(l), intermediateEnds(iEnds) {}
        // indices along route
        int start;
        int end;
        double length;
        std::vector<int> intermediateEnds;
    };
 
    std::set<SUMOVehicle*, ComparatorNumericalIdLess> myTrains;
 
    std::vector<VehicleEvent> myVehicleEvents;
    std::vector<MSDriveWay*> myFoes;
    std::map<const MSDriveWay*, std::vector<Siding>, ComparatorIdLess> mySidings;
    std::vector<std::set <const MSDriveWay*> > myDeadlocks;
 
    /* @brief shortened versions of this driveway to be used as foes instead of the long original
     * (ends as soon as the train has left a particular conflict section)
     * they are never attached to a LinkInfo and thus never the target of the match() function */
    std::vector<MSDriveWay*> mySubDriveWays;
 
    std::vector<const MSEdge*> myReversals;
 
    std::string myFirstVehicle;
 
    static int myGlobalDriveWayIndex;
    static bool myWriteVehicles;
    static double myMovingBlockMaxDist;
    static std::set<const MSEdge*> myBlockLengthWarnings;
 
    static std::map<const MSLink*, std::vector<MSDriveWay*> > mySwitchDriveWays;
 
    static std::map<const MSEdge*, std::vector<MSDriveWay*> > myReversalDriveWays;
 
    static std::map<const MSEdge*, std::vector<MSDriveWay*>, ComparatorNumericalIdLess > myDepartureDriveways;
    static std::map<const MSJunction*, int> myDepartDrivewayIndex;
    static std::map<const MSEdge*, std::vector<MSDriveWay*> > myDepartureDrivewaysEnds;
 
    static std::map<const MSEdge*, std::vector<MSDriveWay*>, ComparatorNumericalIdLess> myEndingDriveways;
    static std::map<const MSEdge*, std::vector<std::pair<MSDriveWay*, MSDriveWay*> >, ComparatorNumericalIdLess> mySidingDriveways;
    static std::vector<const MSEdge*> myCurrentSidingCheck;
 
    static std::map<ConstMSEdgeVector, MSDriveWay*> myDriveWayRouteLookup;
    static std::map<std::string, MSDriveWay*> myDriveWayLookup;
    static const std::vector<MSDriveWay*> EMPTY_DRIVEWAY_VECTOR;
 
};