101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. 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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/*
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* Modified by ScyllaDB
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* Copyright 2015 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 "database.hh"
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#include "gms/i_endpoint_state_change_subscriber.hh"
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#include "gms/gossiper.hh"
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namespace service {
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class load_broadcaster : public gms::i_endpoint_state_change_subscriber, public enable_shared_from_this<load_broadcaster>
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{
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public:
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static constexpr std::chrono::milliseconds BROADCAST_INTERVAL{60 * 1000};
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private:
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distributed<database>& _db;
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gms::gossiper& _gossiper;
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std::unordered_map<gms::inet_address, double> _load_info;
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timer<> _timer;
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future<> _done = make_ready_future<>();
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public:
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load_broadcaster(distributed<database>& db, gms::gossiper& g) : _db(db), _gossiper(g) {
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_gossiper.register_(shared_from_this());
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}
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~load_broadcaster() {
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_gossiper.unregister_(shared_from_this());
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}
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void on_change(gms::inet_address endpoint, gms::application_state state, const gms::versioned_value& value) {
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if (state == gms::application_state::LOAD) {
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_load_info[endpoint] = std::stod(value.value);
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}
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}
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void on_join(gms::inet_address endpoint, gms::endpoint_state ep_state) override {
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auto local_value = ep_state.get_application_state(gms::application_state::LOAD);
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if (local_value) {
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on_change(endpoint, gms::application_state::LOAD, local_value.value());
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}
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}
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void before_change(gms::inet_address endpoint, gms::endpoint_state current_state, gms::application_state new_state_key, const gms::versioned_value& newValue) {}
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void on_alive(gms::inet_address endpoint, gms::endpoint_state) override {}
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void on_dead(gms::inet_address endpoint, gms::endpoint_state) override {}
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void on_restart(gms::inet_address endpoint, gms::endpoint_state) override {}
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void on_remove(gms::inet_address endpoint) {
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_load_info.erase(endpoint);
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}
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const std::unordered_map<gms::inet_address, double> get_load_info() const {
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return _load_info;
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}
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void start_broadcasting();
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future<> stop_broadcasting();
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};
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}
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