frozen_mutation.hh

/*
 * 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

#include "atomic_cell.hh"
#include "keys.hh"
#include "mutation.hh"
#include "mutation_partition_view.hh"


// Immutable, compact form of mutation.
//
// This form is primarily destined to be sent over the network channel.
// Regular mutation can't be deserialized because its complex data structures
// need schema reference at the time object is constructed. We can't lookup
// schema before we deserialize column family ID. Another problem is that even
// if we had the ID somehow, low level RPC layer doesn't know how to lookup
// the schema. Data can be wrapped in frozen_mutation without schema
// information, the schema is only needed to access some of the fields.
//
class frozen_mutation final {
private:
    bytes _bytes;
public:
    frozen_mutation(const mutation& m);
    explicit frozen_mutation(bytes&& b);
    frozen_mutation(frozen_mutation&& m) = default;
    frozen_mutation(const frozen_mutation& m) = default;
    frozen_mutation& operator=(frozen_mutation&&) = default;
    frozen_mutation& operator=(const frozen_mutation&) = default;

    bytes_view representation() const { return _bytes; }
    utils::UUID column_family_id() const;
    partition_key_view key(const schema& s) const;
    mutation_partition_view partition() const;
    mutation unfreeze(schema_ptr s) const;
};

frozen_mutation freeze(const mutation& m);