New object for cached database, also ClientInfo class

core/storage/cache.h

@@ -0,0 +1,50 @@
+// Squawk messenger. 
+// Copyright (C) 2019  Yury Gubich <blue@macaw.me>
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program 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 General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef CORE_CACHE_H
+#define CORE_CACHE_H
+
+#include <map>
+
+#include <QString>
+
+#include <core/storage/storage.h>
+
+namespace Core {
+
+template <class T>
+class Cache
+{
+public:
+    Cache(const QString& name);
+    ~Cache();
+
+    void open();
+    void close();
+
+    void addRecord(const QString& key, const T& value);
+    void changeRecord(const QString& key, const T& value);
+    void removeRecord(const QString& key);
+    T getRecord(const QString& key) const;
+
+private:
+    Core::Storage<T> storage;
+    std::map<QString, T>* cache;
+};
+
+}
+
+#endif // CORE_CACHE_H