1 files changed, 68 insertions, 0 deletions

diff --git a/common/changereplay.h b/common/changereplay.h
new file mode 100644
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--- /dev/null
+++ b/common/changereplay.h
@@ -0,0 +1,68 @@
+/*
+ * 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 <Async/Async>
+
+#include "storage.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 QByteArray &resourceName);
+
+    qint64 getLastReplayedRevision();
+    bool allChangesReplayed();
+
+signals:
+    void changesReplayed();
+
+public slots:
+    void revisionChanged();
+
+protected:
+    virtual KAsync::Job<void> replay(const QByteArray &type, const QByteArray &key, const QByteArray &value) = 0;
+    Sink::Storage mStorage;
+
+private:
+    Sink::Storage mChangeReplayStore;
+};
+
+class NullChangeReplay : public ChangeReplay
+{
+    public:
+    NullChangeReplay() : ChangeReplay("null") {}
+    KAsync::Job<void> replay(const QByteArray &type, const QByteArray &key, const QByteArray &value) Q_DECL_OVERRIDE { return KAsync::null<void>(); }
+};
+
+}
+