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/*
* Copyright (C) 2008-2017 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_MASK_ALL = DATABASE_LOGIN | DATABASE_CHARACTER | DATABASE_WORLD
};
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__
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