qgsnetworkdiskcache.h

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/***************************************************************************
 qgsnetworkdiskcache.h  -  Thread-safe interface for QNetworkDiskCache
    -------------------
    begin                : 2016-03-05
    copyright            : (C) 2016 by Juergen E. Fischer
    email                : jef at norbit dot de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 QGSNETWORKDISKCACHE_H
#define QGSNETWORKDISKCACHE_H

#include <QNetworkDiskCache>
#include <QMutex>

class QNetworkDiskCache;

class QgsNetworkDiskCache : public QNetworkDiskCache
{
    Q_OBJECT

  public:
    ~QgsNetworkDiskCache();

    QString cacheDirectory() const;

    void setCacheDirectory( const QString &cacheDir );

    qint64 maximumCacheSize() const;

    void setMaximumCacheSize( qint64 size );

    QNetworkCacheMetaData metaData( const QUrl &url ) override;

    void updateMetaData( const QNetworkCacheMetaData &metaData ) override;

    QIODevice *data( const QUrl &url ) override;

    bool remove( const QUrl &url ) override;

    qint64 cacheSize() const override;

    QIODevice *prepare( const QNetworkCacheMetaData &metaData ) override;

    void insert( QIODevice *device ) override;

    QNetworkCacheMetaData fileMetaData( const QString &fileName ) const;

  public slots:
    void clear() override;

  protected:
    virtual qint64 expire() override;

  private:
    explicit QgsNetworkDiskCache( QObject *parent );
    Q_DISABLE_COPY( QgsNetworkDiskCache )

    class ExpirableNetworkDiskCache : public QNetworkDiskCache
    {
      public:
        explicit ExpirableNetworkDiskCache( QObject *parent = 0 ) : QNetworkDiskCache( parent ) {}
        qint64 runExpire() { return QNetworkDiskCache::expire(); }
    };

    static ExpirableNetworkDiskCache smDiskCache;
    static QMutex smDiskCacheMutex;

    friend class QgsNetworkAccessManager;
};

#endif // QGSNETWORKDISKCACHE_H