mutation.hh

/*
 * Copyright (C) 2014 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 <iostream>

#include "mutation_partition.hh"
#include "keys.hh"
#include "schema.hh"
#include "dht/i_partitioner.hh"

class mutation final {
private:
    struct data {
        schema_ptr _schema;
        dht::decorated_key _dk;
        mutation_partition _p;

        data(dht::decorated_key&& key, schema_ptr&& schema);
        data(partition_key&& key, schema_ptr&& schema);
        data(schema_ptr&& schema, dht::decorated_key&& key, const mutation_partition& mp);
        data(schema_ptr&& schema, dht::decorated_key&& key, mutation_partition&& mp);
    };
    std::unique_ptr<data> _ptr;
public:
    mutation(dht::decorated_key key, schema_ptr schema)
        : _ptr(std::make_unique<data>(std::move(key), std::move(schema)))
    { }
    mutation(partition_key key_, schema_ptr schema)
        : _ptr(std::make_unique<data>(std::move(key_), std::move(schema)))
    { }
    mutation(schema_ptr schema, dht::decorated_key key, const mutation_partition& mp)
        : _ptr(std::make_unique<data>(std::move(schema), std::move(key), mp))
    { }
    mutation(schema_ptr schema, dht::decorated_key key, mutation_partition&& mp)
        : _ptr(std::make_unique<data>(std::move(schema), std::move(key), std::move(mp)))
    { }
    mutation(const mutation& m)
        : _ptr(std::make_unique<data>(schema_ptr(m.schema()), dht::decorated_key(m.decorated_key()), m.partition()))
    { }

    mutation(mutation&&) = default;
    mutation& operator=(mutation&& x) = default;

    void set_static_cell(const column_definition& def, atomic_cell_or_collection&& value);
    void set_static_cell(const bytes& name, const boost::any& value, api::timestamp_type timestamp, ttl_opt ttl = {});
    void set_clustered_cell(const exploded_clustering_prefix& prefix, const column_definition& def, atomic_cell_or_collection&& value);
    void set_clustered_cell(const clustering_key& key, const bytes& name, const boost::any& value, api::timestamp_type timestamp, ttl_opt ttl = {});
    void set_clustered_cell(const clustering_key& key, const column_definition& def, atomic_cell_or_collection&& value);
    void set_cell(const exploded_clustering_prefix& prefix, const bytes& name, const boost::any& value, api::timestamp_type timestamp, ttl_opt ttl = {});
    void set_cell(const exploded_clustering_prefix& prefix, const column_definition& def, atomic_cell_or_collection&& value);
    std::experimental::optional<atomic_cell_or_collection> get_cell(const clustering_key& rkey, const column_definition& def) const;
    const partition_key& key() const { return _ptr->_dk._key; };
    const dht::decorated_key& decorated_key() const { return _ptr->_dk; };
    const dht::token& token() const { return _ptr->_dk._token; }
    const schema_ptr& schema() const { return _ptr->_schema; }
    const mutation_partition& partition() const { return _ptr->_p; }
    mutation_partition& partition() { return _ptr->_p; }
    const utils::UUID& column_family_id() const { return _ptr->_schema->id(); }
    bool operator==(const mutation&) const;
    bool operator!=(const mutation&) const;
public:
    query::result query(const query::partition_slice&, gc_clock::time_point now = gc_clock::now(), uint32_t row_limit = query::max_rows) const;

    // See mutation_partition::live_row_count()
    size_t live_row_count(gc_clock::time_point query_time = gc_clock::time_point::min()) const;
private:
    friend std::ostream& operator<<(std::ostream& os, const mutation& m);
};

struct mutation_decorated_key_less_comparator {
    bool operator()(const mutation& m1, const mutation& m2) const;
};

using mutation_opt = std::experimental::optional<mutation>;

inline
void apply(mutation_opt& dst, mutation&& src) {
    if (!dst) {
        dst = std::move(src);
    } else {
        dst->partition().apply(*src.schema(), src.partition());
    }
}

inline
void apply(mutation_opt& dst, mutation_opt&& src) {
    if (src) {
        apply(dst, std::move(*src));
    }
}

// Returns a range into partitions containing mutations covered by the range.
// partitions must be sorted according to decorated key.
// range must not wrap around.
boost::iterator_range<std::vector<mutation>::const_iterator> slice(
    const std::vector<mutation>& partitions,
    const query::partition_range&);