Refactored the generic resource to use separate classes for

changereplay and synchronization.

This cleans up the API and avoids the excessive passing around of
transactions. It also provides more flexibility in eventually using
different synchronization strategies for different resources.

1 files changed, 68 insertions, 0 deletions

diff --git a/common/changereplay.h b/common/changereplay.h
new file mode 100644
index 0000000..a568060
--- /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>(); }
+};
+
+}
+