59 lines
1.7 KiB
C++
59 lines
1.7 KiB
C++
/*
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* Copyright (C) 2016 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 <seastar/core/shared_future.hh>
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namespace gms {
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/**
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* A gossip feature tracks whether all the nodes the current one is
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* aware of support the specified feature.
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*
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* A feature should only be created once the gossiper is available.
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*/
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class feature final {
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sstring _name;
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bool _enabled = false;
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mutable shared_promise<> _pr;
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friend class gossiper;
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public:
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explicit feature(sstring name, bool enabled = false);
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feature() = default;
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~feature();
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feature(const feature& other) = delete;
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void enable();
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feature& operator=(feature&& other);
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const sstring& name() const {
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return _name;
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}
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explicit operator bool() const {
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return _enabled;
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}
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friend inline std::ostream& operator<<(std::ostream& os, const feature& f) {
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return os << "{ gossip feature = " << f._name << " }";
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}
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future<> when_enabled() const { return _pr.get_shared_future(); }
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};
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} // namespace gms
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