110 lines
3.8 KiB
C++
110 lines
3.8 KiB
C++
/*
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* Copyright (C) 2015-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#include <algorithm>
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#include "local_strategy.hh"
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#include "dht/token.hh"
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#include "utils/class_registrator.hh"
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#include "exceptions/exceptions.hh"
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namespace locator {
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local_strategy::local_strategy(replication_strategy_params params, const topology*) :
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abstract_replication_strategy(params, replication_strategy_type::local) {
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_natural_endpoints_depend_on_token = false;
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}
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future<host_id_set> local_strategy::calculate_natural_endpoints(const token& t, const token_metadata& tm) const {
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return make_ready_future<host_id_set>(host_id_set{tm.get_topology().my_host_id()});
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}
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void local_strategy::validate_options(const gms::feature_service&, const locator::topology&) const {
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if (_uses_tablets) {
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throw exceptions::configuration_exception("LocalStrategy doesn't support tablet replication");
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}
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}
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size_t local_strategy::get_replication_factor(const token_metadata&) const {
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return 1;
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}
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sstring local_strategy::sanity_check_read_replicas(const effective_replication_map& erm, const host_id_vector_replica_set& read_replicas) const {
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if (read_replicas.size() > 1) {
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return seastar::format("local_strategy: the number of replicas for local_strategy is {}, cannot be higher than 1", read_replicas.size());
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}
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return {};
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}
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future<mutable_static_effective_replication_map_ptr> local_effective_replication_map::clone_gently(replication_strategy_ptr rs, token_metadata_ptr tmptr) const {
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return make_ready_future<mutable_static_effective_replication_map_ptr>(make_local_effective_replication_map_ptr(std::move(rs), std::move(tmptr)));
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}
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host_id_vector_replica_set local_effective_replication_map::get_natural_replicas(const token&, bool is_vnode) const {
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return _replica_set;
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}
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host_id_vector_topology_change local_effective_replication_map::get_pending_replicas(const token&) const {
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return host_id_vector_topology_change{};
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}
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host_id_vector_replica_set local_effective_replication_map::get_replicas_for_reading(const token& token, bool is_vnode) const {
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return _replica_set;
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}
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host_id_vector_replica_set local_effective_replication_map::get_replicas(const token&, bool is_vnode) const {
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return _replica_set;
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}
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std::optional<tablet_routing_info> local_effective_replication_map::check_locality(const token& token) const {
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return std::nullopt;
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}
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bool local_effective_replication_map::has_pending_ranges(locator::host_id endpoint) const {
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return false;
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}
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std::unique_ptr<token_range_splitter> local_effective_replication_map::make_splitter() const {
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class local_splitter : public token_range_splitter {
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std::optional<dht::token> _cur;
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public:
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local_splitter()
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: _cur(dht::minimum_token())
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{ }
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void reset(dht::ring_position_view pos) override {
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_cur = pos.token();
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}
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std::optional<dht::token> next_token() override {
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if (auto cur = std::exchange(_cur, std::nullopt)) {
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return cur;
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}
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return std::nullopt;
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}
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};
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return std::make_unique<local_splitter>();
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}
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const dht::sharder& local_effective_replication_map::get_sharder(const schema& s) const {
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return s.get_sharder();
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}
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future<dht::token_range_vector> local_effective_replication_map::get_ranges(host_id ep) const {
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if (ep == _tmptr->get_topology().my_host_id()) {
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return make_ready_future<dht::token_range_vector>(_local_ranges);
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}
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return make_ready_future<dht::token_range_vector>();
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}
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using registry = class_registrator<abstract_replication_strategy, local_strategy, replication_strategy_params, const topology*>;
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static registry registrator("org.apache.cassandra.locator.LocalStrategy");
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static registry registrator_short_name("LocalStrategy");
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}
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