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hashing_partition_visitor.hh
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hashing_partition_visitor.hh
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/*
* Copyright (C) 2015 ScyllaDB
*/
/*
* 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
#include "mutation_partition_visitor.hh"
#include "hashing.hh"
#include "schema.hh"
#include "atomic_cell_hash.hh"
#include "keys.hh"
#include "counters.hh"
// Calculates a hash of a mutation_partition which is consistent with
// mutation equality. For any equal mutations, no matter which schema
// version they were generated under, the hash fed will be the same for both of them.
template<typename Hasher>
class hashing_partition_visitor : public mutation_partition_visitor {
Hasher& _h;
const schema& _s;
public:
hashing_partition_visitor(Hasher& h, const schema& s)
: _h(h)
, _s(s)
{ }
virtual void accept_partition_tombstone(tombstone t) {
feed_hash(_h, t);
}
virtual void accept_static_cell(column_id id, atomic_cell_view cell) {
auto&& col = _s.static_column_at(id);
feed_hash(_h, col.name());
feed_hash(_h, col.type->name());
feed_hash(_h, cell, col);
}
virtual void accept_static_cell(column_id id, collection_mutation_view cell) {
auto&& col = _s.static_column_at(id);
feed_hash(_h, col.name());
feed_hash(_h, col.type->name());
feed_hash(_h, cell, col);
}
virtual void accept_row_tombstone(const range_tombstone& rt) {
rt.feed_hash(_h, _s);
}
virtual void accept_row(position_in_partition_view pos, const row_tombstone& deleted_at, const row_marker& rm, is_dummy dummy, is_continuous continuous) override {
if (dummy) {
return;
}
pos.key().feed_hash(_h, _s);
feed_hash(_h, deleted_at);
feed_hash(_h, rm);
}
virtual void accept_row_cell(column_id id, atomic_cell_view cell) {
auto&& col = _s.regular_column_at(id);
feed_hash(_h, col.name());
feed_hash(_h, col.type->name());
feed_hash(_h, cell, col);
}
virtual void accept_row_cell(column_id id, collection_mutation_view cell) {
auto&& col = _s.regular_column_at(id);
feed_hash(_h, col.name());
feed_hash(_h, col.type->name());
feed_hash(_h, cell, col);
}
};