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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
91 lines
2.6 KiB
C++
91 lines
2.6 KiB
C++
/*
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* Copyright (C) 2017-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 <stdexcept>
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#include <type_traits>
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#include <seastar/core/sstring.hh>
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namespace sstables {
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enum class sstable_version_types { ka, la, mc, md };
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enum class sstable_format_types { big };
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constexpr std::array<sstable_version_types, 4> all_sstable_versions = {
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sstable_version_types::ka,
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sstable_version_types::la,
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sstable_version_types::mc,
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sstable_version_types::md,
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};
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constexpr std::array<sstable_version_types, 2> writable_sstable_versions = {
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sstable_version_types::mc,
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sstable_version_types::md,
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};
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constexpr sstable_version_types oldest_writable_sstable_format = sstable_version_types::mc;
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template <size_t S1, size_t S2>
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constexpr bool check_sstable_versions(const std::array<sstable_version_types, S1>& all_sstable_versions,
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const std::array<sstable_version_types, S2>& writable_sstable_versions, sstable_version_types oldest_writable_sstable_format) {
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for (auto v : writable_sstable_versions) {
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if (v < oldest_writable_sstable_format) {
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return false;
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}
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}
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size_t expected = 0;
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for (auto v : all_sstable_versions) {
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if (v >= oldest_writable_sstable_format) {
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++expected;
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}
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}
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return expected == S2;
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}
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static_assert(check_sstable_versions(all_sstable_versions, writable_sstable_versions, oldest_writable_sstable_format));
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inline auto get_highest_sstable_version() {
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return all_sstable_versions[all_sstable_versions.size() - 1];
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}
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inline sstable_version_types from_string(const seastar::sstring& format) {
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if (format == "ka") {
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return sstable_version_types::ka;
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}
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if (format == "la") {
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return sstable_version_types::la;
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}
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if (format == "mc") {
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return sstable_version_types::mc;
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}
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if (format == "md") {
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return sstable_version_types::md;
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}
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throw std::invalid_argument("Wrong sstable format name: " + format);
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}
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inline seastar::sstring to_string(sstable_version_types format) {
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switch (format) {
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case sstable_version_types::ka: return "ka";
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case sstable_version_types::la: return "la";
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case sstable_version_types::mc: return "mc";
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case sstable_version_types::md: return "md";
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}
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throw std::runtime_error("Wrong sstable format");
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}
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inline int operator<=>(sstable_version_types a, sstable_version_types b) {
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auto to_int = [] (sstable_version_types x) {
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return static_cast<std::underlying_type_t<sstable_version_types>>(x);
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};
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return to_int(a) - to_int(b);
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}
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}
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