mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 02:32:43 +01:00
126 lines
4.4 KiB
C++
126 lines
4.4 KiB
C++
/*
|
|
* Copyright (C) 2016 Charybdis Development Team
|
|
* Copyright (C) 2016 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
*/
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_DB_CELL_H
|
|
|
|
namespace ircd {
|
|
namespace db {
|
|
|
|
struct cell
|
|
{
|
|
struct delta;
|
|
|
|
column c;
|
|
string_view index;
|
|
database::snapshot ss;
|
|
std::unique_ptr<rocksdb::Iterator> it;
|
|
|
|
public:
|
|
operator const rocksdb::Iterator &() const { return *it; }
|
|
operator const database::snapshot &() const { return ss; }
|
|
explicit operator const column &() const { return c; }
|
|
operator rocksdb::Iterator &() { return *it; }
|
|
operator database::snapshot &() { return ss; }
|
|
explicit operator column &() { return c; }
|
|
|
|
bool valid() const; // cell exists
|
|
operator bool() const { return valid(); }
|
|
bool operator!() const { return !valid(); }
|
|
|
|
// [GET] read from cell (zero-copy)
|
|
string_view col() const { return name(c); /* always column name */ }
|
|
string_view key() const; // key == index or empty on invalid
|
|
string_view val() const; // empty on !valid()
|
|
string_view key(); // reload then key == index or empty on invalid
|
|
string_view val(); // reload then empty on !valid()
|
|
|
|
// [GET] read from cell (zero-copy)
|
|
explicit operator string_view() const; // empty on !valid()
|
|
explicit operator string_view(); // reload then empty on !valid()
|
|
|
|
// [SET] assign cell
|
|
cell &operator=(const string_view &);
|
|
|
|
// [GET] -> [SET] assign cell (atomic)
|
|
bool compare_exchange(string_view &expected, const string_view &desired);
|
|
string_view exchange(const string_view &desired);
|
|
|
|
bool load(gopts = {});
|
|
|
|
cell(column, const string_view &index, std::unique_ptr<rocksdb::Iterator>);
|
|
cell(column, const string_view &index, gopts = {});
|
|
cell(database &, const string_view &column, const string_view &index, gopts = {});
|
|
cell();
|
|
cell(cell &&) noexcept;
|
|
cell(const cell &) = delete;
|
|
cell &operator=(cell &&) noexcept;
|
|
cell &operator=(const cell &) = delete;
|
|
~cell() noexcept;
|
|
|
|
friend std::ostream &operator<<(std::ostream &s, const cell &c);
|
|
};
|
|
|
|
struct cell::delta
|
|
:std::tuple<op, cell &, string_view>
|
|
{
|
|
delta(const enum op &op, cell &c, const string_view &val = {})
|
|
:std::tuple<enum op, cell &, string_view>{op, c, val}
|
|
{}
|
|
|
|
delta(cell &c, const string_view &val, const enum op &op = op::SET)
|
|
:std::tuple<enum op, cell &, string_view>{op, c, val}
|
|
{}
|
|
};
|
|
|
|
// [SET] Perform operations in a sequence as a single transaction.
|
|
void write(const cell::delta &, const sopts & = {});
|
|
void write(const std::initializer_list<cell::delta> &, const sopts & = {});
|
|
void write(const sopts &, const std::initializer_list<cell::delta> &);
|
|
|
|
const std::string &name(const cell &);
|
|
uint64_t sequence(const cell &);
|
|
|
|
} // namespace db
|
|
} // namespace ircd
|
|
|
|
inline
|
|
uint64_t
|
|
ircd::db::sequence(const cell &c)
|
|
{
|
|
const database::snapshot &ss(c);
|
|
return sequence(ss);
|
|
}
|
|
|
|
inline
|
|
const std::string &
|
|
ircd::db::name(const cell &c)
|
|
{
|
|
return name(c.c);
|
|
}
|
|
|
|
inline std::ostream &
|
|
ircd::db::operator<<(std::ostream &s, const cell &c)
|
|
{
|
|
s << string_view{c};
|
|
return s;
|
|
}
|