fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
41 lines
1.6 KiB
C++
41 lines
1.6 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <iostream>
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#include <cstdint>
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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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