fcb8d040e8
Instead of lengthy blurbs, switch to single-line, machine-readable standardized (https://spdx.dev) license identifiers. The Linux kernel switched long ago, so there is strong precedent. Three cases are handled: AGPL-only, Apache-only, and dual licensed. For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0), reasoning that our changes are extensive enough to apply our license. The changes we applied mechanically with a script, except to licenses/README.md. Closes #9937
237 lines
8.5 KiB
C++
237 lines
8.5 KiB
C++
/*
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*
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* Modified by ScyllaDB
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* Copyright (C) 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 <seastar/core/sstring.hh>
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#include "utils/serialization.hh"
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#include "utils/UUID.hh"
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#include "version_generator.hh"
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#include "gms/inet_address.hh"
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#include "dht/i_partitioner.hh"
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#include "to_string.hh"
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#include "version.hh"
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#include "cdc/generation_id.hh"
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#include <unordered_set>
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namespace gms {
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/**
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* This abstraction represents the state associated with a particular node which an
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* application wants to make available to the rest of the nodes in the cluster.
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* Whenever a piece of state needs to be disseminated to the rest of cluster wrap
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* the state in an instance of <i>ApplicationState</i> and add it to the Gossiper.
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* <p></p>
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* e.g. if we want to disseminate load information for node A do the following:
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* <p></p>
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* ApplicationState loadState = new ApplicationState(<string representation of load>);
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* Gossiper.instance.addApplicationState("LOAD STATE", loadState);
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*/
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class versioned_value {
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public:
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// this must be a char that cannot be present in any token
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static constexpr char DELIMITER = ',';
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static constexpr const char DELIMITER_STR[] = { DELIMITER, 0 };
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// values for ApplicationState.STATUS
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static constexpr const char* STATUS_UNKNOWN = "UNKNOWN";
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static constexpr const char* STATUS_BOOTSTRAPPING = "BOOT";
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static constexpr const char* STATUS_NORMAL = "NORMAL";
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static constexpr const char* STATUS_LEAVING = "LEAVING";
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static constexpr const char* STATUS_LEFT = "LEFT";
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static constexpr const char* STATUS_MOVING = "MOVING";
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static constexpr const char* REMOVING_TOKEN = "removing";
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static constexpr const char* REMOVED_TOKEN = "removed";
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static constexpr const char* HIBERNATE = "hibernate";
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static constexpr const char* SHUTDOWN = "shutdown";
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// values for ApplicationState.REMOVAL_COORDINATOR
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static constexpr const char* REMOVAL_COORDINATOR = "REMOVER";
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int version;
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sstring value;
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public:
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bool operator==(const versioned_value& other) const noexcept {
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return version == other.version &&
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value == other.value;
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}
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public:
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versioned_value(const sstring& value, int version = version_generator::get_next_version())
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: version(version), value(value) {
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#if 0
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// blindly interning everything is somewhat suboptimal -- lots of VersionedValues are unique --
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// but harmless, and interning the non-unique ones saves significant memory. (Unfortunately,
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// we don't really have enough information here in VersionedValue to tell the probably-unique
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// values apart.) See CASSANDRA-6410.
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this.value = value.intern();
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#endif
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}
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versioned_value(sstring&& value, int version = version_generator::get_next_version()) noexcept
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: version(version), value(std::move(value)) {
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}
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versioned_value() noexcept
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: version(-1) {
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}
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int compare_to(const versioned_value &value) const noexcept {
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return version - value.version;
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}
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friend inline std::ostream& operator<<(std::ostream& os, const versioned_value& x) {
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return os << "Value(" << x.value << "," << x.version << ")";
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}
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static sstring version_string(const std::initializer_list<sstring>& args) {
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return ::join(sstring(versioned_value::DELIMITER_STR), args);
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}
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static sstring make_full_token_string(const std::unordered_set<dht::token>& tokens);
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static sstring make_token_string(const std::unordered_set<dht::token>& tokens);
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static sstring make_cdc_generation_id_string(std::optional<cdc::generation_id>);
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// Reverse of `make_full_token_string`.
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static std::unordered_set<dht::token> tokens_from_string(const sstring&);
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// Reverse of `make_cdc_generation_id_string`.
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static std::optional<cdc::generation_id> cdc_generation_id_from_string(const sstring&);
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static versioned_value clone_with_higher_version(const versioned_value& value) noexcept {
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return versioned_value(value.value);
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}
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static versioned_value bootstrapping(const std::unordered_set<dht::token>& tokens) {
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return versioned_value(version_string({sstring(versioned_value::STATUS_BOOTSTRAPPING),
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make_token_string(tokens)}));
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}
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static versioned_value normal(const std::unordered_set<dht::token>& tokens) {
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return versioned_value(version_string({sstring(versioned_value::STATUS_NORMAL),
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make_token_string(tokens)}));
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}
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static versioned_value load(double load) {
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return versioned_value(to_sstring(load));
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}
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static versioned_value schema(const utils::UUID &new_version) {
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return versioned_value(new_version.to_sstring());
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}
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static versioned_value leaving(const std::unordered_set<dht::token>& tokens) {
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return versioned_value(version_string({sstring(versioned_value::STATUS_LEAVING),
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make_token_string(tokens)}));
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}
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static versioned_value left(const std::unordered_set<dht::token>& tokens, int64_t expire_time) {
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return versioned_value(version_string({sstring(versioned_value::STATUS_LEFT),
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make_token_string(tokens),
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std::to_string(expire_time)}));
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}
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static versioned_value moving(dht::token t) {
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std::unordered_set<dht::token> tokens = {t};
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return versioned_value(version_string({sstring(versioned_value::STATUS_MOVING),
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make_token_string(tokens)}));
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}
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static versioned_value host_id(const utils::UUID& host_id) {
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return versioned_value(host_id.to_sstring());
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}
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static versioned_value tokens(const std::unordered_set<dht::token>& tokens) {
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return versioned_value(make_full_token_string(tokens));
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}
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static versioned_value cdc_generation_id(std::optional<cdc::generation_id> gen_id) {
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return versioned_value(make_cdc_generation_id_string(gen_id));
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}
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static versioned_value removing_nonlocal(const utils::UUID& host_id) {
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return versioned_value(sstring(REMOVING_TOKEN) +
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sstring(DELIMITER_STR) + host_id.to_sstring());
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}
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static versioned_value removed_nonlocal(const utils::UUID& host_id, int64_t expire_time) {
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return versioned_value(sstring(REMOVED_TOKEN) + sstring(DELIMITER_STR) +
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host_id.to_sstring() + sstring(DELIMITER_STR) + to_sstring(expire_time));
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}
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static versioned_value removal_coordinator(const utils::UUID& host_id) {
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return versioned_value(sstring(REMOVAL_COORDINATOR) +
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sstring(DELIMITER_STR) + host_id.to_sstring());
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}
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static versioned_value hibernate(bool value) {
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return versioned_value(sstring(HIBERNATE) + sstring(DELIMITER_STR) + (value ? "true" : "false"));
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}
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static versioned_value shutdown(bool value) {
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return versioned_value(sstring(SHUTDOWN) + sstring(DELIMITER_STR) + (value ? "true" : "false"));
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}
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static versioned_value datacenter(const sstring& dc_id) {
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return versioned_value(dc_id);
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}
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static versioned_value rack(const sstring& rack_id) {
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return versioned_value(rack_id);
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}
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static versioned_value snitch_name(const sstring& snitch_name) {
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return versioned_value(snitch_name);
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}
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static versioned_value shard_count(int shard_count) {
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return versioned_value(format("{}", shard_count));
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}
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static versioned_value ignore_msb_bits(unsigned ignore_msb_bits) {
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return versioned_value(format("{}", ignore_msb_bits));
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}
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static versioned_value rpcaddress(gms::inet_address endpoint) {
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return versioned_value(format("{}", endpoint));
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}
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static versioned_value release_version() {
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return versioned_value(version::release());
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}
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static versioned_value network_version();
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static versioned_value internal_ip(const sstring &private_ip) {
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return versioned_value(private_ip);
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}
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static versioned_value severity(double value) {
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return versioned_value(to_sstring(value));
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}
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static versioned_value supported_features(const std::set<std::string_view>& features) {
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return versioned_value(::join(",", features));
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}
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static versioned_value cache_hitrates(const sstring& hitrates) {
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return versioned_value(hitrates);
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}
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static versioned_value cql_ready(bool value) {
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return versioned_value(to_sstring(int(value)));
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};
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}; // class versioned_value
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} // namespace gms
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