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55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
/*
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* Copyright (C) 2016-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.1
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*/
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#pragma once
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#include "replica/database_fwd.hh"
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#include "schema/schema_fwd.hh"
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#include <seastar/core/timer.hh>
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#include <seastar/core/sharded.hh>
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using namespace seastar;
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namespace gms { class gossiper; }
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namespace service {
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class cache_hitrate_calculator : public seastar::async_sharded_service<cache_hitrate_calculator>, public seastar::peering_sharded_service<cache_hitrate_calculator> {
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struct stat {
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float h = 0;
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float m = 0;
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stat& operator+=(stat& o) {
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h += o.h;
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m += o.m;
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return *this;
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}
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};
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seastar::sharded<replica::database>& _db;
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gms::gossiper& _gossiper;
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timer<lowres_clock> _timer;
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bool _stopped = false;
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float _diff = 0;
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std::unordered_map<table_id, stat> _rates;
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size_t _slen = 0;
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std::string _gstate;
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uint64_t _published_nr = 0;
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lowres_clock::time_point _published_time;
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future<> _done = make_ready_future();
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future<lowres_clock::duration> recalculate_hitrates();
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void recalculate_timer();
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public:
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cache_hitrate_calculator(seastar::sharded<replica::database>& db, gms::gossiper& g);
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void run_on(size_t master, lowres_clock::duration d = std::chrono::milliseconds(2000));
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future<> stop();
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};
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}
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