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63 lines
2.3 KiB
C++
63 lines
2.3 KiB
C++
/*
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* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _QUERY_CALLBACK_H
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#define _QUERY_CALLBACK_H
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#include "DatabaseEnvFwd.h"
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#include "Define.h"
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#include <functional>
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#include <future>
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#include <list>
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#include <queue>
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#include <variant>
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class TC_DATABASE_API QueryCallback
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{
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public:
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explicit QueryCallback(std::future<QueryResult>&& result);
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explicit QueryCallback(std::future<PreparedQueryResult>&& result);
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QueryCallback(QueryCallback&& right) noexcept;
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QueryCallback& operator=(QueryCallback&& right) noexcept;
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~QueryCallback();
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QueryCallback&& WithCallback(std::function<void(QueryResult)>&& callback);
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QueryCallback&& WithPreparedCallback(std::function<void(PreparedQueryResult)>&& callback);
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QueryCallback&& WithChainingCallback(std::function<void(QueryCallback&, QueryResult)>&& callback);
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QueryCallback&& WithChainingPreparedCallback(std::function<void(QueryCallback&, PreparedQueryResult)>&& callback);
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// Moves std::future from next to this object
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void SetNextQuery(QueryCallback&& next);
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// returns true when completed
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bool InvokeIfReady();
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private:
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QueryCallback(QueryCallback const& right) = delete;
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QueryCallback& operator=(QueryCallback const& right) = delete;
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std::variant<std::future<QueryResult>, std::future<PreparedQueryResult>> _query;
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using QueryCallbackData = std::variant<std::function<void(QueryCallback&, QueryResult)>, std::function<void(QueryCallback&, PreparedQueryResult)>>;
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std::queue<QueryCallbackData, std::list<QueryCallbackData>> _callbacks;
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};
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inline bool InvokeAsyncCallbackIfReady(QueryCallback& callback) { return callback.InvokeIfReady(); }
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#endif // _QUERY_CALLBACK_H
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