Optimize room config

src/CMakeLists.txt

@@ -127,6 +127,8 @@ add_library(neochat STATIC
     mediasizehelper.h
     eventhandler.cpp
     enums/delegatetype.h
+    roomlastmessageprovider.cpp
+    roomlastmessageprovider.h
 )
 
 qt_add_qml_module(neochat URI org.kde.neochat NO_PLUGIN

src/neochatroom.cpp

@@ -47,6 +47,7 @@
 #include "filetransferpseudojob.h"
 #include "neochatconfig.h"
 #include "notificationsmanager.h"
+#include "roomlastmessageprovider.h"
 #include "texthandler.h"
 #include "urlhelper.h"
 #include "utils.h"
@@ -72,12 +73,10 @@ NeoChatRoom::NeoChatRoom(Connection *connection, QString roomId, JoinState joinS
 
     connect(this, &Room::aboutToAddHistoricalMessages, this, &NeoChatRoom::readMarkerLoadedChanged);
 
-    // Load cached event if available.
-    KConfig dataResource("data"_ls, KConfig::SimpleConfig, QStandardPaths::AppDataLocation);
-    KConfigGroup eventCacheGroup(&dataResource, "EventCache"_ls);
+    const auto &roomLastMessageProvider = RoomLastMessageProvider::self();
 
-    if (eventCacheGroup.hasKey(id())) {
-        auto eventJson = QJsonDocument::fromJson(eventCacheGroup.readEntry(id(), QByteArray())).object();
+    if (roomLastMessageProvider.hasKey(id())) {
+        auto eventJson = QJsonDocument::fromJson(roomLastMessageProvider.read(id())).object();
         if (!eventJson.isEmpty()) {
             auto event = loadEvent<RoomEvent>(eventJson);
 
@@ -309,11 +308,10 @@ void NeoChatRoom::cacheLastEvent()
 {
     auto event = lastEvent();
     if (event != nullptr) {
-        KConfig dataResource("data"_ls, KConfig::SimpleConfig, QStandardPaths::AppDataLocation);
-        KConfigGroup eventCacheGroup(&dataResource, "EventCache"_ls);
+        auto &roomLastMessageProvider = RoomLastMessageProvider::self();
 
         auto eventJson = QJsonDocument(event->fullJson()).toJson();
-        eventCacheGroup.writeEntry(id(), eventJson);
+        roomLastMessageProvider.write(id(), eventJson);
 
         auto uniqueEvent = loadEvent<RoomEvent>(event->fullJson());
 

src/roomlastmessageprovider.cpp

@@ -0,0 +1,38 @@
+// SPDX-FileCopyrightText: 2023 Carl Schwan <carl@carlschwan.eu>
+// SPDX-License-Identifier: LGPL-2.0-or-later
+
+#include "roomlastmessagestate.h"
+
+using namespace Qt::Literals::StringLiterals;
+
+RoomLastMessageState::RoomLastMessageState()
+    : m_config(KSharedConfig::openConfig(u"data"_s, KConfig::SimpleConfig, QStandardPaths::AppDataLocation))
+    , m_configGroup(KConfigGroup(m_config, u"EventCache"_s))
+{
+}
+
+RoomLastMessageState::~RoomLastMessageState()
+{
+    m_config->sync();
+}
+
+RoomLastMessageState &RoomLastMessageState::self()
+{
+    static RoomLastMessageState instance;
+    return instance;
+}
+
+bool RoomLastMessageState::hasKey(const QString &roomId) const
+{
+    return m_configGroup.hasKey(roomId);
+}
+
+QByteArray RoomLastMessageState::read(const QString &roomId) const
+{
+    return m_configGroup.readEntry(roomId, QByteArray{});
+}
+
+void RoomLastMessageState::write(const QString &roomId, const QByteArray &json)
+{
+    m_configGroup.writeEntry(roomId, json);
+}

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;
+};