76 lines
1.8 KiB
C++
76 lines
1.8 KiB
C++
/*
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* Copyright (C) 2020-present ScyllaDB
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*
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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 <seastar/core/semaphore.hh>
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#include <seastar/core/future.hh>
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#include <seastar/core/gate.hh>
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#include <seastar/core/sharded.hh>
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#include "sstables/version.hh"
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#include "gms/feature.hh"
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using namespace seastar;
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namespace replica {
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class database;
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}
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namespace gms {
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class gossiper;
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class feature_service;
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}
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namespace db {
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class sstables_format_selector;
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class feature_enabled_listener : public gms::feature::listener {
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sstables_format_selector& _selector;
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sstables::sstable_version_types _format;
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public:
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feature_enabled_listener(sstables_format_selector& s, sstables::sstable_version_types format)
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: _selector(s)
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, _format(format)
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{ }
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void on_enabled() override;
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};
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class sstables_format_selector {
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gms::gossiper& _gossiper;
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sharded<gms::feature_service>& _features;
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sharded<replica::database>& _db;
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seastar::named_semaphore _sem = {1, named_semaphore_exception_factory{"feature listeners"}};
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seastar::gate _sel;
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feature_enabled_listener _md_feature_listener;
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feature_enabled_listener _me_feature_listener;
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sstables::sstable_version_types _selected_format = sstables::sstable_version_types::mc;
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future<> select_format(sstables::sstable_version_types new_format);
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future<> read_sstables_format();
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future<> do_maybe_select_format(sstables::sstable_version_types new_format);
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public:
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sstables_format_selector(gms::gossiper& g, sharded<gms::feature_service>& f, sharded<replica::database>& db);
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future<> start();
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future<> stop();
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future<> maybe_select_format(sstables::sstable_version_types new_format);
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void sync() {
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get_units(_sem, 1).get0();
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}
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};
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} // namespace sstables
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