QueryCallback.h

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/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * 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 _QUERY_CALLBACK_H
#define _QUERY_CALLBACK_H
 
#include "DatabaseEnvFwd.h"
#include "Define.h"
#include <functional>
#include <list>
#include <queue>
 
class TC_DATABASE_API QueryCallback
{
public:
 explicit QueryCallback(QueryResultFuture&& result);
 explicit QueryCallback(PreparedQueryResultFuture&& result);
 QueryCallback(QueryCallback&& right) noexcept;
 QueryCallback& operator=(QueryCallback&& right) noexcept;
 ~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