consistencychecker.h

Go to the documentation of this file.

/**********************************************************************
 * 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 <memory>
#include <variant>
#include <QObject>
#include "dbconfig.h"
 
template<typename>
class QFuture;
 
template<typename>
class QFutureInterface;
 
namespace LC::Util
{
    class UTIL_DB_API ConsistencyChecker : public QObject
                                         , public std::enable_shared_from_this<ConsistencyChecker>
    {
        const QString DBPath_;
        const QString DialogContext_;
 
        friend class FailedImpl;
 
        ConsistencyChecker (QString dbPath, QString dialogContext, QObject* = nullptr);
    public:
        static std::shared_ptr<ConsistencyChecker> Create (QString dbPath, QString dialogContext);
 
        struct DumpFinished
        {
            qint64 OldFileSize_;
            qint64 NewFileSize_;
        };
        struct DumpError
        {
            QString Error_;
        };
        using DumpResult_t = std::variant<DumpFinished, DumpError>;
 
        struct Succeeded {};
        struct IFailed
        {
            virtual QFuture<DumpResult_t> DumpReinit () = 0;
 
            // Not having a virtual dtor here is fine, since its subclasses will
            // only be deleted through a shared_ptr, which remembers the exact
            // type of the constructed object.
        };
        using Failed = std::shared_ptr<IFailed>;
 
        using CheckResult_t = std::variant<Succeeded, Failed>;
 
        QFuture<CheckResult_t> StartCheck ();
    private:
        CheckResult_t CheckDB ();
 
        QFuture<DumpResult_t> DumpReinit ();
        void DumpReinitImpl (QFutureInterface<DumpResult_t>);
 
        void HandleDumperFinished (QFutureInterface<DumpResult_t>, const QString&);
    };
}