mirror of
https://github.com/scylladb/scylladb.git
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c073997431
This commit introduce public raft interfaces. raft::server represents single raft server instance. raft::state_machine represents a user defined state machine. raft::rpc, raft::rpc_client and raft::storage are used to allow implementing custom networking and storage layers. A shared failure detector interface defines keep-alive semantics, required for efficient implementation of thousands of raft groups.
106 lines
2.8 KiB
C++
106 lines
2.8 KiB
C++
/*
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* Copyright (C) 2020 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 <ostream>
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#include <functional>
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#include "utils/UUID.hh"
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namespace raft {
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namespace internal {
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template<typename Tag>
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class tagged_uint64 {
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uint64_t _val;
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public:
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tagged_uint64() : _val(0) {}
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explicit tagged_uint64(uint64_t v) : _val(v) {}
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tagged_uint64(const tagged_uint64&) = default;
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tagged_uint64(tagged_uint64&&) = default;
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tagged_uint64& operator=(const tagged_uint64&) = default;
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auto operator<=>(const tagged_uint64&) const = default;
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explicit operator bool() const { return _val != 0; }
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operator uint64_t() const {
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return _val;
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}
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tagged_uint64& operator++() { // pre increment
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++_val;
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return *this;
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}
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tagged_uint64 operator++(int) { // post increment
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uint64_t v = _val++;
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return tagged_uint64(v);
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}
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tagged_uint64& operator--() { // pre decrement
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--_val;
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return *this;
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}
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tagged_uint64 operator--(int) { // post decrement
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uint64_t v = _val--;
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return tagged_uint64(v);
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}
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tagged_uint64 operator+(const tagged_uint64& o) const {
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return tagged_uint64(_val + o._val);
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}
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tagged_uint64 operator-(const tagged_uint64& o) const {
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return tagged_uint64(_val - o._val);
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}
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friend std::ostream& operator<<(std::ostream& os, const tagged_uint64<Tag>& u) {
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os << u._val;
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return os;
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}
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};
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template<typename Tag>
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struct tagged_id {
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utils::UUID id;
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bool operator==(const tagged_id& o) const {
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return id == o.id;
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}
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explicit operator bool() const {
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// The default constructor sets the id to nil, which is
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// guaranteed to not match any valid id.
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return id != utils::UUID();
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}
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};
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template<typename Tag>
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std::ostream& operator<<(std::ostream& os, const tagged_id<Tag>& id) {
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os << id.id;
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return os;
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}
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} // end of namespace internal
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} // end of namespace raft
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namespace std {
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template<typename Tag>
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struct hash<raft::internal::tagged_id<Tag>> {
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size_t operator()(const raft::internal::tagged_id<Tag>& id) const {
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return hash<utils::UUID>()(id.id);
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}
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};
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} // end of namespace std
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