mirror of
https://github.com/matrix-construct/construct
synced 2024-11-05 05:18:54 +01:00
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_DB_DELTA_H
|
|
|
|
namespace ircd::db
|
|
{
|
|
struct delta;
|
|
enum op :uint8_t;
|
|
|
|
// Indicates an op uses both a key and value for its operation. Some only use
|
|
// a key name so an empty value argument in a delta is okay when false.
|
|
bool value_required(const op &);
|
|
string_view reflect(const op &);
|
|
}
|
|
|
|
/// Types of delta operations
|
|
enum ircd::db::op
|
|
:uint8_t
|
|
{
|
|
GET, // no-op sentinel, do not use (debug asserts)
|
|
SET, // (batch.Put)
|
|
MERGE, // (batch.Merge)
|
|
DELETE, // (batch.Delete)
|
|
DELETE_RANGE, // (batch.DeleteRange)
|
|
SINGLE_DELETE, // (batch.SingleDelete)
|
|
};
|
|
|
|
/// Update a database cell without `cell`, `column` or row `references`.
|
|
///
|
|
/// The cell is found by name string. This is the least efficient of the deltas
|
|
/// for many updates to the same column or cell when a reference to those can
|
|
/// be pre-resolved. This delta has to resolve those references every single
|
|
/// time it's iterated over; but that's okay for some transactions.
|
|
///
|
|
struct ircd::db::delta
|
|
:std::tuple<op, string_view, string_view, string_view>
|
|
{
|
|
enum // for use with std::get<VAL>(delta)
|
|
{
|
|
OP, COL, KEY, VAL,
|
|
};
|
|
|
|
delta(const enum op &op,
|
|
const string_view &col,
|
|
const string_view &key,
|
|
const string_view &val = {})
|
|
:std::tuple<enum op, string_view, string_view, string_view>
|
|
{
|
|
op, col, key, val
|
|
}{}
|
|
|
|
delta(const string_view &col,
|
|
const string_view &key,
|
|
const string_view &val = {},
|
|
const enum op &op = op::SET)
|
|
:std::tuple<enum op, string_view, string_view, string_view>
|
|
{
|
|
op, col, key, val
|
|
}{}
|
|
|
|
delta() = default;
|
|
};
|