36 lines
1.0 KiB
C++
36 lines
1.0 KiB
C++
//
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// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2019
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#pragma once
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#include "td/utils/common.h"
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namespace td {
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class KeyValueSyncInterface {
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public:
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// SeqNo is used to restore total order on all write queries.
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// Some implementations may return 0 as SeqNo.
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using SeqNo = uint64;
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KeyValueSyncInterface() = default;
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KeyValueSyncInterface(const KeyValueSyncInterface &) = delete;
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KeyValueSyncInterface &operator=(const KeyValueSyncInterface &) = delete;
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KeyValueSyncInterface(KeyValueSyncInterface &&) = default;
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KeyValueSyncInterface &operator=(KeyValueSyncInterface &&) = default;
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virtual ~KeyValueSyncInterface() = default;
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virtual SeqNo set(string key, string value) = 0;
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virtual bool isset(const string &key) = 0;
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virtual string get(const string &key) = 0;
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virtual SeqNo erase(const string &key) = 0;
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};
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} // namespace td
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