b7517183fa
Leverage fragmented_temporary_buffer when reading commit log entries, avoiding large allocations. Refs #4020 Signed-off-by: Duarte Nunes <duarte@scylladb.com>
67 lines
2.2 KiB
C++
67 lines
2.2 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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#include "counters.hh"
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#include "commitlog_entry.hh"
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#include "idl/uuid.dist.hh"
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#include "idl/keys.dist.hh"
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#include "idl/frozen_mutation.dist.hh"
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#include "idl/mutation.dist.hh"
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#include "idl/commitlog.dist.hh"
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#include "serializer_impl.hh"
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#include "serialization_visitors.hh"
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#include "idl/uuid.dist.impl.hh"
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#include "idl/keys.dist.impl.hh"
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#include "idl/frozen_mutation.dist.impl.hh"
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#include "idl/mutation.dist.impl.hh"
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#include "idl/commitlog.dist.impl.hh"
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#include <seastar/core/simple-stream.hh>
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template<typename Output>
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void commitlog_entry_writer::serialize(Output& out) const {
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[this, wr = ser::writer_of_commitlog_entry<Output>(out)] () mutable {
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if (_with_schema) {
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return std::move(wr).write_mapping(_schema->get_column_mapping());
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} else {
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return std::move(wr).skip_mapping();
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}
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}().write_mutation(_mutation).end_commitlog_entry();
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}
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void commitlog_entry_writer::compute_size() {
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seastar::measuring_output_stream ms;
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serialize(ms);
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_size = ms.size();
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}
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void commitlog_entry_writer::write(typename seastar::memory_output_stream<std::vector<temporary_buffer<char>>::iterator>& out) const {
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serialize(out);
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}
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commitlog_entry_reader::commitlog_entry_reader(const fragmented_temporary_buffer& buffer)
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: _ce([&] {
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auto in = seastar::fragmented_memory_input_stream(fragmented_temporary_buffer::view(buffer).begin(), buffer.size_bytes());
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return ser::deserialize(in, boost::type<commitlog_entry>());
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}())
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{
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}
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