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https://github.com/scylladb/scylladb.git
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c16ec870da
Now that the endpoint_state isn't change in place we do not need to copy it to each subscriber. We can rather just pass the lw_shared_ptr holding a snapshot of it. Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
/*
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* Modified by ScyllaDB
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* Copyright 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: (AGPL-3.0-or-later and Apache-2.0)
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*/
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#pragma once
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#include "replica/database_fwd.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<replica::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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bool _stopped = false;
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public:
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load_broadcaster(distributed<replica::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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assert(_stopped);
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}
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virtual future<> on_change(gms::inet_address endpoint, gms::application_state state, const gms::versioned_value& value, gms::permit_id) override {
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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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return make_ready_future();
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}
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virtual future<> on_join(gms::inet_address endpoint, gms::endpoint_state_ptr ep_state, gms::permit_id pid) override {
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auto* local_value = ep_state->get_application_state_ptr(gms::application_state::LOAD);
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if (local_value) {
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return on_change(endpoint, gms::application_state::LOAD, *local_value, pid);
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}
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return make_ready_future();
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}
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virtual future<> before_change(gms::inet_address endpoint, gms::endpoint_state_ptr current_state, gms::application_state new_state_key, const gms::versioned_value& newValue) override { return make_ready_future(); }
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future<> on_alive(gms::inet_address endpoint, gms::endpoint_state_ptr, gms::permit_id) override { return make_ready_future(); }
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future<> on_dead(gms::inet_address endpoint, gms::endpoint_state_ptr, gms::permit_id) override { return make_ready_future(); }
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future<> on_restart(gms::inet_address endpoint, gms::endpoint_state_ptr, gms::permit_id) override { return make_ready_future(); }
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virtual future<> on_remove(gms::inet_address endpoint, gms::permit_id) override {
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_load_info.erase(endpoint);
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return make_ready_future();
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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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