Optimize room config

src/roomlastmessageprovider.h

@@ -0,0 +1,41 @@
+// SPDX-FileCopyrightText: 2023 Carl Schwan <carl@carlschwan.eu>
+// SPDX-License-Identifier: LGPL-2.0-or-later
+
+#pragma once
+
+#include <KConfigGroup>
+#include <KSharedConfig>
+
+/**
+ * Store and retrieve the last message of a room.
+ */
+class RoomLastMessageProvider
+{
+public:
+    /**
+     * Get the global instance of RoomLastMessageProvider.
+     */
+    static RoomLastMessageProvider &self();
+    ~RoomLastMessageProvider();
+
+    /**
+     * Check if we have the last message content for the specified roomId.
+     */
+    bool hasKey(const QString &roomId) const;
+
+    /**
+     * Read the last message content of the specified roomId.
+     */
+    QByteArray read(const QString &roomId) const;
+
+    /**
+     * Write the last message content for the specified roomId.
+     */
+    void write(const QString &roomId, const QByteArray &json);
+
+private:
+    RoomLastMessageProvider();
+
+    KSharedConfig::Ptr m_config;
+    KConfigGroup m_configGroup;
+};