88 lines
2.6 KiB
C++
88 lines
2.6 KiB
C++
/*
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* Copyright 2016 ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <experimental/optional>
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#include "frozen_mutation.hh"
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#include "schema.hh"
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namespace stdx = std::experimental;
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class commitlog_entry_writer {
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schema_ptr _schema;
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db::serializer<column_mapping> _column_mapping_serializer;
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const frozen_mutation& _mutation;
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bool _with_schema = true;
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public:
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commitlog_entry_writer(schema_ptr s, const frozen_mutation& fm)
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: _schema(std::move(s)), _column_mapping_serializer(_schema->get_column_mapping()), _mutation(fm)
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{ }
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void set_with_schema(bool value) {
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_with_schema = value;
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}
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bool with_schema() {
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return _with_schema;
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}
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schema_ptr schema() const {
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return _schema;
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}
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size_t size() const {
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size_t size = data_output::serialized_size<bool>();
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if (_with_schema) {
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size += _column_mapping_serializer.size();
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}
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size += _mutation.representation().size();
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return size;
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}
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void write(data_output& out) const {
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out.write(_with_schema);
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if (_with_schema) {
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_column_mapping_serializer.write(out);
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}
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auto bv = _mutation.representation();
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out.write(bv.begin(), bv.end());
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}
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};
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class commitlog_entry_reader {
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frozen_mutation _mutation;
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stdx::optional<column_mapping> _column_mapping;
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public:
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commitlog_entry_reader(const temporary_buffer<char>& buffer)
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: _mutation(bytes())
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{
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data_input in(buffer);
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bool has_column_mapping = in.read<bool>();
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if (has_column_mapping) {
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_column_mapping = db::serializer<::column_mapping>::read(in);
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}
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auto bv = in.read_view(in.avail());
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_mutation = frozen_mutation(bytes(bv.begin(), bv.end()));
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}
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const stdx::optional<column_mapping>& get_column_mapping() const { return _column_mapping; }
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const frozen_mutation& mutation() const { return _mutation; }
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}; |