Files
scylladb/atomic_cell_hash.hh
Tomasz Grabiec a6084ee007 mutation: Make hashable
The computed hash is independent of any internal representation thus
can be used as a digest across nodes and versions.
2016-01-08 21:10:26 +01:00

58 lines
1.8 KiB
C++

/*
* Copyright (C) 2015 Cloudius Systems, Ltd.
*/
/*
* This file is part of Scylla.
*
* Scylla is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Scylla is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
// Not part of atomic_cell.hh to avoid cyclic dependency between types.hh and atomic_cell.hh
#include "types.hh"
#include "atomic_cell.hh"
#include "hashing.hh"
template<typename Hasher>
void feed_hash(collection_mutation_view cell, Hasher& h, const data_type& type) {
auto&& ctype = static_pointer_cast<const collection_type_impl>(type);
auto m_view = ctype->deserialize_mutation_form(cell);
::feed_hash(h, m_view.tomb);
for (auto&& key_and_value : m_view.cells) {
::feed_hash(h, key_and_value.first);
::feed_hash(h, key_and_value.second);
}
}
template<>
struct appending_hash<atomic_cell_view> {
template<typename Hasher>
void operator()(Hasher& h, atomic_cell_view cell) const {
feed_hash(h, cell.is_live());
feed_hash(h, cell.timestamp());
if (cell.is_live()) {
if (cell.is_live_and_has_ttl()) {
feed_hash(h, cell.expiry());
feed_hash(h, cell.ttl());
}
feed_hash(h, cell.value());
} else {
feed_hash(h, cell.deletion_time());
}
}
};