DatabaseLoader.h

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/*
 * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
 *
 * 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 2 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 DatabaseLoader_h__
#define DatabaseLoader_h__

#include "DatabaseWorkerPool.h"
#include "DBUpdater.h"

#include <functional>
#include <stack>
#include <queue>

// A helper class to initiate all database worker pools,
// handles updating, delays preparing of statements and cleans up on failure.
class TC_DATABASE_API DatabaseLoader
{
public:
 DatabaseLoader(std::string const& logger, uint32 const defaultUpdateMask);

 // Register a database to the loader (lazy implemented)
 template <class T>
 DatabaseLoader& AddDatabase(DatabaseWorkerPool<T>& pool, std::string const& name);

 // Load all databases
 bool Load();

 enum DatabaseTypeFlags
 {
 DATABASE_NONE = 0,

 DATABASE_LOGIN = 1,
 DATABASE_CHARACTER = 2,
 DATABASE_WORLD = 4,
 DATABASE_HOTFIX = 8,

 DATABASE_MASK_ALL = DATABASE_LOGIN | DATABASE_CHARACTER | DATABASE_WORLD | DATABASE_HOTFIX
 };

private:
 bool OpenDatabases();
 bool PopulateDatabases();
 bool UpdateDatabases();
 bool PrepareStatements();

 using Predicate = std::function<bool()>;
 using Closer = std::function<void()>;

 // Invokes all functions in the given queue and closes the databases on errors.
 // Returns false when there was an error.
 bool Process(std::queue<Predicate>& queue);

 std::string const _logger;
 bool const _autoSetup;
 uint32 const _updateFlags;

 std::queue<Predicate> _open, _populate, _update, _prepare;
 std::stack<Closer> _close;
};

#endif // DatabaseLoader_h__