Rework DB session + transactions. Now can handle multiple read only transactions in parallel

src/database/Database.hpp

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2019 Emeric Poupon
+ *
+ * This file is part of LMS.
+ *
+ * LMS 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.
+ *
+ * LMS 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 LMS.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <shared_mutex>
+
+#include <boost/filesystem.hpp>
+
+#include <Wt/Dbo/SqlConnectionPool.h>
+
+#include "Session.hpp"
+
+namespace Database {
+
+// Session living class handling the database and the login
+class Database
+{
+	public:
+
+		Database(const boost::filesystem::path& dbPath);
+
+		std::unique_ptr<Session> createSession();
+
+	private:
+		std::shared_timed_mutex		_sharedMutex;
+		std::unique_ptr<Wt::Dbo::SqlConnectionPool> _connectionPool;
+};
+
+} // namespace Database
+
+