qgsrangerequestcache.h

Go to the documentation of this file.

/***************************************************************************
                         qgsrangerequestcache.h
                         --------------------
    begin                : April 2022
    copyright            : (C) 2022 by Belgacem Nedjima
    email                : belgacem dot nedjima at gmail dot com
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSRANGEREQUESTCACHE_H
#define QGSRANGEREQUESTCACHE_H
 
#include "qgis_core.h"
 
#include <QByteArray>
#include <QDir>
#include <QFileInfoList>
#include <QMap>
#include <QNetworkRequest>
#include <QUrl>
#include <QtGlobal>
 
#define SIP_NO_FILE

class CORE_EXPORT QgsRangeRequestCache
{
  public:
    QgsRangeRequestCache();

    bool hasEntry( const QNetworkRequest &request );
    QByteArray entry( const QNetworkRequest &request );
    void registerEntry( const QNetworkRequest &request, QByteArray data );

    void clear();

    bool setCacheDirectory( const QString &path );
    void setCacheSize( qint64 maxBytes );

    QString error() const { return mError; }
 
    friend class TestQgsCopcProvider;
  private:
    QString mError;
    QString mCacheDir;
    qint64 mMaxDataSize = 256 * 1024 * 1024;
 
    QString rangeFileName( const QNetworkRequest &request ) const;
 
    QByteArray readFile( const QString &fileName );
    bool writeFile( const QString &fileName, QByteArray data );
    bool removeFile( const QString &fileName );
 
    void expire();
 
    QFileInfoList cacheEntries();
};
 
#endif // QGSRANGEREQUESTCACHE_H