104 lines
5.6 KiB
C++
104 lines
5.6 KiB
C++
/*
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* ProtocolVersion.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2019 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <cstdint>
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#define PROTOCOL_VERSION_FEATURE(v, x) \
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struct x { \
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static constexpr uint64_t protocolVersion = v; \
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}; \
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constexpr bool has##x() const { return this->version() > x ::protocolVersion; } \
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static constexpr ProtocolVersion with##x() { return ProtocolVersion(x ::protocolVersion); }
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// ProtocolVersion wraps a uint64_t to make it type safe. It will know about the current versions.
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// The default constuctor will initialize the version to 0 (which is an invalid
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// version). ProtocolVersion objects should never be compared to version numbers
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// directly. Instead one should always use the type-safe version types from which
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// this class inherits all.
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class ProtocolVersion {
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uint64_t _version;
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public: // constants
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static constexpr uint64_t versionFlagMask = 0x0FFFFFFFFFFFFFFFLL;
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static constexpr uint64_t objectSerializerFlag = 0x1000000000000000LL;
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static constexpr uint64_t compatibleProtocolVersionMask = 0xffffffffffff0000LL;
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static constexpr uint64_t minValidProtocolVersion = 0x0FDB00A200060001LL;
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public:
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constexpr explicit ProtocolVersion(uint64_t version) : _version(version) {}
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constexpr ProtocolVersion() : _version(0) {}
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constexpr bool isCompatible(ProtocolVersion other) const {
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return (other.version() & compatibleProtocolVersionMask) == (version() & compatibleProtocolVersionMask);
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}
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constexpr bool isValid() const { return version() >= minValidProtocolVersion; }
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constexpr uint64_t version() const { return _version & versionFlagMask; }
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constexpr uint64_t versionWithFlags() const { return _version; }
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constexpr bool hasObjectSerializerFlag() const { return (_version & objectSerializerFlag) > 0; }
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constexpr void addObjectSerializerFlag() { _version = _version | objectSerializerFlag; }
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constexpr void removeObjectSerializerFlag() {
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_version = hasObjectSerializerFlag() ? _version ^ objectSerializerFlag : _version;
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}
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constexpr void removeAllFlags() { _version = version(); }
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// comparison operators
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// Comparison operators ignore the flags - this is because the version flags are stored in the
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// most significant byte which can make comparison confusing. Also, generally, when one wants to
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// compare versions, we are usually not interested in the flags.
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constexpr bool operator==(const ProtocolVersion other) const { return version() == other.version(); }
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constexpr bool operator!=(const ProtocolVersion other) const { return version() != other.version(); }
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constexpr bool operator<=(const ProtocolVersion other) const { return version() <= other.version(); }
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constexpr bool operator>=(const ProtocolVersion other) const { return version() >= other.version(); }
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constexpr bool operator<(const ProtocolVersion other) const { return version() < other.version(); }
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constexpr bool operator>(const ProtocolVersion other) const { return version() > other.version(); }
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public: // introduced features
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PROTOCOL_VERSION_FEATURE(0x0FDB00A200090000LL, Watches);
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PROTOCOL_VERSION_FEATURE(0x0FDB00A2000D0000LL, MovableCoordinatedState);
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PROTOCOL_VERSION_FEATURE(0x0FDB00A340000000LL, ProcessID);
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PROTOCOL_VERSION_FEATURE(0x0FDB00A400040000LL, OpenDatabase);
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PROTOCOL_VERSION_FEATURE(0x0FDB00A446020000LL, Locality);
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PROTOCOL_VERSION_FEATURE(0x0FDB00A460010000LL, MultiGenerationTLog);
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PROTOCOL_VERSION_FEATURE(0x0FDB00A460010000LL, SharedMutations);
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PROTOCOL_VERSION_FEATURE(0x0FDB00A551000000LL, MultiVersionClient);
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PROTOCOL_VERSION_FEATURE(0x0FDB00A560010000LL, TagLocality);
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PROTOCOL_VERSION_FEATURE(0x0FDB00B060000000LL, Fearless);
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PROTOCOL_VERSION_FEATURE(0x0FDB00B061020000LL, EndpointAddrList);
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PROTOCOL_VERSION_FEATURE(0x0FDB00B061030000LL, IPv6);
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PROTOCOL_VERSION_FEATURE(0x0FDB00B061030000LL, TLogVersion);
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PROTOCOL_VERSION_FEATURE(0x0FDB00B061070000LL, PseudoLocalities);
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PROTOCOL_VERSION_FEATURE(0x0FDB00B061070000LL, ShardedTxsTags);
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};
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// These impact both communications and the deserialization of certain database and IKeyValueStore keys.
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//
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// The convention is that 'x' and 'y' should match the major and minor version of the software, and 'z' should be 0.
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// To make a change without a corresponding increase to the x.y version, increment the 'dev' digit.
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//
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// xyzdev
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// vvvv
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constexpr ProtocolVersion currentProtocolVersion(0x0FDB00B062010001LL);
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// This assert is intended to help prevent incrementing the leftmost digits accidentally. It will probably need to
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// change when we reach version 10.
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static_assert(currentProtocolVersion.version() < 0x0FDB00B100000000LL, "Unexpected protocol version");
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