mirror of
https://github.com/matrix-construct/construct
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71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 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. The
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// full license for this software is available in the LICENSE file.
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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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struct delta;
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enum op :uint8_t;
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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 &);
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string_view reflect(const op &);
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}
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/// Types of delta operations
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enum ircd::db::op
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:uint8_t
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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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/// Update a database cell without `cell`, `column` or row `references`.
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///
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/// The cell is found by name string. This is the least efficient of the deltas
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/// for many updates to the same column or cell when a reference to those can
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/// be pre-resolved. This delta has to resolve those references every single
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/// time it's iterated over; but that's okay for some transactions.
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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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enum // for use with std::get<VAL>(delta)
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{
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OP, COL, KEY, VAL,
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};
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delta(const enum op &op,
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const string_view &col,
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const string_view &key,
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const string_view &val = {})
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:std::tuple<enum op, string_view, string_view, string_view>
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{
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op, col, key, val
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}{}
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delta(const string_view &col,
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const string_view &key,
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const string_view &val = {},
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const enum op &op = op::SET)
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:std::tuple<enum op, string_view, string_view, string_view>
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{
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op, col, key, val
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}{}
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delta() = default;
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};
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