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/*
* Copyright (C) 2016 Christian Mollekopf <mollekopf@kolabsys.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "sink_export.h"
#include <QObject>
#include <KAsync/Async>
#include "storage.h"
#include "resourcecontext.h"
namespace Sink {
/**
* Replays changes from the storage one by one.
*
* Uses a local database to:
* * Remember what changes have been replayed already.
* * store a mapping of remote to local buffers
*/
class SINK_EXPORT ChangeReplay : public QObject
{
Q_OBJECT
public:
ChangeReplay(const ResourceContext &resourceContext, const Sink::Log::Context &ctx= {});
qint64 getLastReplayedRevision();
virtual bool allChangesReplayed();
signals:
void changesReplayed();
void replayingChanges();
public slots:
virtual void revisionChanged();
protected:
virtual KAsync::Job<void> replay(const QByteArray &type, const QByteArray &key, const QByteArray &value) = 0;
virtual bool canReplay(const QByteArray &type, const QByteArray &key, const QByteArray &value) = 0;
Sink::Storage::DataStore mStorage;
KAsync::Job<void> replayNextRevision();
private:
void recordReplayedRevision(qint64 revision);
Sink::Storage::DataStore mChangeReplayStore;
bool mReplayInProgress;
Sink::Storage::DataStore::Transaction mMainStoreTransaction;
Sink::Log::Context mLogCtx;
QSharedPointer<QObject> mGuard;
};
class NullChangeReplay : public ChangeReplay
{
public:
NullChangeReplay(const ResourceContext &resourceContext) : ChangeReplay(resourceContext) {}
KAsync::Job<void> replay(const QByteArray &type, const QByteArray &key, const QByteArray &value) Q_DECL_OVERRIDE { return KAsync::null<void>(); }
bool canReplay(const QByteArray &type, const QByteArray &key, const QByteArray &value) Q_DECL_OVERRIDE { return false; }
};
}
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