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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 _QUERY_CALLBACK_H
#define _QUERY_CALLBACK_H
#include "DatabaseEnvFwd.h"
#include "Define.h"
#include <functional>
#include <future>
#include <list>
#include <queue>
#include <utility>
class AC_DATABASE_API QueryCallback
{
public:
explicit QueryCallback(QueryResultFuture&& result);
explicit QueryCallback(PreparedQueryResultFuture&& result);
QueryCallback(QueryCallback&& right);
QueryCallback& operator=(QueryCallback&& right);
~QueryCallback();
QueryCallback&& WithCallback(std::function<void(QueryResult)>&& callback);
QueryCallback&& WithPreparedCallback(std::function<void(PreparedQueryResult)>&& callback);
QueryCallback&& WithChainingCallback(std::function<void(QueryCallback&, QueryResult)>&& callback);
QueryCallback&& WithChainingPreparedCallback(std::function<void(QueryCallback&, PreparedQueryResult)>&& callback);
// Moves std::future from next to this object
void SetNextQuery(QueryCallback&& next);
// returns true when completed
bool InvokeIfReady();
private:
QueryCallback(QueryCallback const& right) = delete;
QueryCallback& operator=(QueryCallback const& right) = delete;
template<typename T> friend void ConstructActiveMember(T* obj);
template<typename T> friend void DestroyActiveMember(T* obj);
template<typename T> friend void MoveFrom(T* to, T&& from);
union
{
QueryResultFuture _string;
PreparedQueryResultFuture _prepared;
};
bool _isPrepared;
struct QueryCallbackData;
std::queue<QueryCallbackData, std::list<QueryCallbackData>> _callbacks;
};
#endif // _QUERY_CALLBACK_H
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