mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 10:42:47 +01:00
77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
/*
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* Copyright (C) 2016 Charybdis Development Team
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* Copyright (C) 2016 Jason Volk <jason@zemos.net>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice is present in all copies.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#pragma once
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#define HAVE_IRCD_DB_DELTA_H
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namespace ircd::db
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{
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enum op
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{
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GET, // no-op sentinel, do not use (debug asserts)
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SET, // (batch.Put)
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MERGE, // (batch.Merge)
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DELETE, // (batch.Delete)
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DELETE_RANGE, // (batch.DeleteRange)
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SINGLE_DELETE, // (batch.SingleDelete)
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};
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// Indicates an op uses both a key and value for its operation. Some only use
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// a key name so an empty value argument in a delta is okay when false.
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bool value_required(const op &op);
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using merge_delta = std::pair<string_view, string_view>;
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using merge_closure = std::function<std::string (const string_view &key, const merge_delta &)>;
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using update_closure = std::function<std::string (const string_view &key, merge_delta &)>;
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struct delta;
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struct comparator;
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struct prefix_transform;
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}
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struct ircd::db::delta
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:std::tuple<op, string_view, string_view, string_view>
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{
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delta(const string_view &col, const string_view &key, const string_view &val = {}, const enum op &op = op::SET)
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:std::tuple<enum op, string_view, string_view, string_view>{op, col, key, val}
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{}
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delta(const enum op &op, const string_view &col, const string_view &key, const string_view &val = {})
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:std::tuple<enum op, string_view, string_view, string_view>{op, col, key, val}
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{}
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delta() = default;
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};
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struct ircd::db::comparator
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{
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std::string name;
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std::function<bool (const string_view &, const string_view &)> less;
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std::function<bool (const string_view &, const string_view &)> equal;
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};
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struct ircd::db::prefix_transform
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{
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std::string name;
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std::function<bool (const string_view &)> has;
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std::function<string_view (const string_view &)> get;
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};
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