53 lines
2.2 KiB
C++
53 lines
2.2 KiB
C++
/*
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* Copyright (C) 2015 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 <iosfwd>
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using cql_protocol_version_type = uint8_t;
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// Abstraction of transport protocol-dependent serialization format
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// Protocols v1, v2 used 16 bits for collection sizes, while v3 and
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// above use 32 bits. But letting every bit of the code know what
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// transport protocol we're using (and in some cases, we aren't using
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// any transport -- it's for internal storage) is bad, so abstract it
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// away here.
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class cql_serialization_format {
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cql_protocol_version_type _version;
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public:
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static constexpr cql_protocol_version_type latest_version = 4;
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explicit cql_serialization_format(cql_protocol_version_type version) : _version(version) {}
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static cql_serialization_format latest() { return cql_serialization_format{latest_version}; }
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static cql_serialization_format internal() { return latest(); }
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bool using_32_bits_for_collections() const { return _version >= 3; }
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bool operator==(cql_serialization_format x) const { return _version == x._version; }
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bool operator!=(cql_serialization_format x) const { return !operator==(x); }
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cql_protocol_version_type protocol_version() const { return _version; }
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friend std::ostream& operator<<(std::ostream& out, const cql_serialization_format& sf) {
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return out << static_cast<int>(sf._version);
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}
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bool collection_format_unchanged(cql_serialization_format other = cql_serialization_format::latest()) const {
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return using_32_bits_for_collections() == other.using_32_bits_for_collections();
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}
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};
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