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49 lines
1.8 KiB
49 lines
1.8 KiB
/*****************************************************************************
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* Copyright (C) 2020 VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* ( at your option ) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef LISTCACHELOADER_HPP
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#define LISTCACHELOADER_HPP
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#include <functional>
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/**
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* Provide operations for the list cache to load an count data
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*
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* These functions are assumed to be long-running, so they may be executed from a
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* separate thread, not to block the UI thread.
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*
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* The callbacks are expected to run on the UI thread
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*/
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template <typename T>
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struct ListCacheLoader
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{
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using ItemType = T;
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virtual ~ListCacheLoader() = default;
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virtual void cancelTask(size_t taskId) = 0;
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virtual size_t countTask(std::function<void(size_t taskId, size_t count)> cb) = 0;
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virtual size_t loadTask(
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size_t offset, size_t limit,
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std::function<void(size_t taskId, std::vector<T>& data)>) = 0;
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virtual size_t countAndLoadTask(
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size_t offset, size_t limit,
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std::function<void(size_t taskId, size_t count, std::vector<T>& data)> cb) = 0;
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};
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#endif
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