TerrainTileManager.h

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#pragma once
 
#include "TerrainQueryInterface.h"
 
#include <QtCore/QMutex>
#include <QtCore/QObject>
#include <QtCore/QQueue>
#include <QtPositioning/QGeoCoordinate>
 
class TerrainTile;
class QNetworkAccessManager;
class UnitTestTerrainQuery;
 
class TerrainTileManager : public QObject
{
    Q_OBJECT
 
    friend class UnitTestTerrainQuery;
public:
    explicit TerrainTileManager(QObject *parent = nullptr);
    ~TerrainTileManager();
 
    static TerrainTileManager *instance();
 
    bool getAltitudesForCoordinates(const QList<QGeoCoordinate> &coordinates, QList<double> &altitudes, bool &error);
 
    void addCoordinateQuery(TerrainQueryInterface *terrainQueryInterface, const QList<QGeoCoordinate> &coordinates);
    void addPathQuery(TerrainQueryInterface *terrainQueryInterface, const QGeoCoordinate &startPoint, const QGeoCoordinate &endPoint);
    void addCarpetQuery(TerrainQueryInterface *terrainQueryInterface, const QGeoCoordinate &swCoord, const QGeoCoordinate &neCoord, bool statsOnly);
 
private slots:
    void _terrainDone();
 
private:
    static QList<QGeoCoordinate> _pathQueryToCoords(const QGeoCoordinate &fromCoord, const QGeoCoordinate &toCoord, double &distanceBetween, double &finalDistanceBetween);
    void _tileFailed();
    void _cacheTile(const QByteArray &data, const QString &hash);
    TerrainTile *_getCachedTile(const QString &hash);
    bool _isFailedTile(const QString &hash);
    bool _recordFailedTile(const QString &hash);    
    void _clearFailedTile(const QString &hash);
    static void _processCarpetResults(const QList<double> &altitudes, int gridSizeLat, int gridSizeLon,
                                      bool statsOnly, double &minHeight, double &maxHeight, QList<QList<double>> &carpet);
 
    struct QueuedRequestInfo_t {
        QPointer<TerrainQueryInterface> terrainQueryInterface;
        TerrainQuery::QueryMode queryMode;
        double distanceBetween;                         
        double finalDistanceBetween;                    
        QList<QGeoCoordinate> coordinates;
        bool carpetStatsOnly;                           
        int carpetGridSizeLat;                          
        int carpetGridSizeLon;                          
    };
 
    QQueue<QueuedRequestInfo_t> _requestQueue;
    TerrainQuery::State _state = TerrainQuery::State::Idle;
 
    QMutex _tilesMutex;                     
    QHash<QString, TerrainTile*> _tiles;
    QHash<QString, qint64> _failedTiles;  
    qint64 _lastFailedTileSweepMs = 0;      
 
    QNetworkAccessManager *_networkManager = nullptr;
 
    static constexpr qint64 kFailedTileBackoffMs = 5000;
};