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Telegram/lib_storage/storage/storage_databases.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include "storage/cache/storage_cache_database.h"
+#include "base/binary_guard.h"
+
+namespace Storage {
+namespace Cache {
+namespace details {
+struct Settings;
+} // namespace details
+class Database;
+} // namespace Cache
+
+class Databases;
+
+class DatabasePointer {
+public:
+	DatabasePointer(const DatabasePointer &other) = delete;
+	DatabasePointer(DatabasePointer &&other);
+	DatabasePointer &operator=(const DatabasePointer &other) = delete;
+	DatabasePointer &operator=(DatabasePointer &&other);
+	~DatabasePointer();
+
+	Cache::Database *get() const;
+	Cache::Database &operator*() const;
+	Cache::Database *operator->() const;
+	explicit operator bool() const;
+
+private:
+	friend class Databases;
+
+	DatabasePointer(
+		not_null<Databases*> owner,
+		const std::unique_ptr<Cache::Database> &value);
+	void destroy();
+
+	Cache::Database *_value = nullptr;
+	not_null<Databases*> _owner;
+
+};
+
+class Databases {
+public:
+	DatabasePointer get(
+		const QString &path,
+		const Cache::details::Settings &settings);
+
+private:
+	friend class DatabasePointer;
+
+	struct Kept {
+		Kept(std::unique_ptr<Cache::Database> &&database);
+
+		std::unique_ptr<Cache::Database> database;
+		base::binary_guard destroying;
+	};
+
+	void destroy(Cache::Database *database);
+
+	std::map<QString, Kept> _map;
+
+};
+
+} // namespace Storage