networkdiskcachegc.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#pragma once
 
#include <memory>
#include <functional>
#include <QObject>
#include <QMap>
#include <QLinkedList>
#include <util/sll/util.h>
 
template<typename T>
class QFuture;
 
namespace LC
{
namespace Util
{
    class NetworkDiskCacheGC : public QObject
    {
        Q_OBJECT
 
        using CacheSizeGetters_t = QLinkedList<std::function<int ()>>;
        QMap<QString, CacheSizeGetters_t> Directories_;
 
        QMap<QString, qint64> LastSizes_;
 
        bool IsCollecting_ = false;
 
        NetworkDiskCacheGC ();
    public:
        NetworkDiskCacheGC (const NetworkDiskCacheGC&) = delete;
        NetworkDiskCacheGC& operator= (const NetworkDiskCacheGC&) = delete;
 
        static NetworkDiskCacheGC& Instance ();
 
        QFuture<qint64> GetCurrentSize (const QString& path) const;
 
        Util::DefaultScopeGuard RegisterDirectory (const QString& path,
                const std::function<int ()>& sizeGetter);
    private:
        void UnregisterDirectory (const QString&, CacheSizeGetters_t::iterator);
    private slots:
        void handleCollect ();
    };
}
}