atomic_cell_hash.hh

/*
 * 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

// Not part of atomic_cell.hh to avoid cyclic dependency between types.hh and atomic_cell.hh

#include "types.hh"
#include "types/collection.hh"
#include "atomic_cell.hh"
#include "atomic_cell_or_collection.hh"
#include "hashing.hh"
#include "counters.hh"

template<>
struct appending_hash<collection_mutation_view> {
    template<typename Hasher>
    void operator()(Hasher& h, collection_mutation_view cell, const column_definition& cdef) const {
      cell.data.with_linearized([&] (bytes_view cell_bv) {
        auto ctype = static_pointer_cast<const collection_type_impl>(cdef.type);
        auto m_view = ctype->deserialize_mutation_form(cell_bv);
        ::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, cdef);
        }
      });
    }
};

template<>
struct appending_hash<atomic_cell_view> {
    template<typename Hasher>
    void operator()(Hasher& h, atomic_cell_view cell, const column_definition& cdef) const {
        feed_hash(h, cell.is_live());
        feed_hash(h, cell.timestamp());
        if (cell.is_live()) {
            if (cdef.is_counter()) {
                counter_cell_view::with_linearized(cell, [&] (counter_cell_view ccv) {
                    ::feed_hash(h, ccv);
                });
                return;
            }
            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());
        }
    }
};

template<>
struct appending_hash<atomic_cell> {
    template<typename Hasher>
    void operator()(Hasher& h, const atomic_cell& cell, const column_definition& cdef) const {
        feed_hash(h, static_cast<atomic_cell_view>(cell), cdef);
    }
};

template<>
struct appending_hash<collection_mutation> {
    template<typename Hasher>
    void operator()(Hasher& h, const collection_mutation& cm, const column_definition& cdef) const {
        feed_hash(h, static_cast<collection_mutation_view>(cm), cdef);
    }
};

template<>
struct appending_hash<atomic_cell_or_collection> {
    template<typename Hasher>
    void operator()(Hasher& h, const atomic_cell_or_collection& c, const column_definition& cdef) const {
        if (cdef.is_atomic()) {
            feed_hash(h, c.as_atomic_cell(cdef), cdef);
        } else {
            feed_hash(h, c.as_collection_mutation(), cdef);
        }
    }
};