networkdiskcachegc.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <functional>
#include <list>
#include <QObject>
#include <QMap>
#include <util/sll/util.h>
 
template<typename T>
class QFuture;
 
namespace LC::Util
{
    class NetworkDiskCacheGC : public QObject
    {
        using CacheSizeGetters_t = std::list<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);
        void HandleCollect ();
    };
}