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/*
* Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
* Copyright (C) 2021+ WarheadCore <https://github.com/WarheadCore>
*/
#ifndef DatabaseLoader_h__
#define DatabaseLoader_h__
#include "Define.h"
#include <functional>
#include <queue>
#include <stack>
#include <string>
template <class T>
class DatabaseWorkerPool;
// A helper class to initiate all database worker pools,
// handles updating, delays preparing of statements and cleans up on failure.
class DatabaseLoader
{
public:
// 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 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::queue<Predicate> _open, _prepare;
std::stack<Closer> _close;
};
#endif // DatabaseLoader_h__
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