foundationdb/fdbserver/ConfigBroadcastInterface.h

/*
 * ConfigBroadcastInterface.h
 *
 * This source file is part of the FoundationDB open source project
 *
 * Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include "fdbserver/ConfigFollowerInterface.h"

class ConfigClassSet {
	std::set<Key> classes;

public:
	static constexpr FileIdentifier file_identifier = 9854021;

	bool operator==(ConfigClassSet const& rhs) const { return classes == rhs.classes; }
	bool operator!=(ConfigClassSet const& rhs) const { return !(*this == rhs); }

	ConfigClassSet() = default;
	ConfigClassSet(VectorRef<KeyRef> configClasses) {
		for (const auto& configClass : configClasses) {
			classes.insert(configClass);
		}
	}
	ConfigClassSet(std::vector<KeyRef> configClasses) {
		for (const auto& configClass : configClasses) {
			classes.insert(configClass);
		}
	}

	bool contains(KeyRef configClass) const { return classes.count(configClass); }
	std::set<Key> const& getClasses() const { return classes; }

	template <class Ar>
	void serialize(Ar& ar) {
		serializer(ar, classes);
	}
};

template <>
struct Traceable<ConfigClassSet> : std::true_type {
	static std::string toString(ConfigClassSet const& value) { return describe(value.getClasses()); }
};

struct ConfigBroadcastSnapshotReply {
	static constexpr FileIdentifier file_identifier = 8701984;

	ConfigBroadcastSnapshotReply() = default;

	template <class Ar>
	void serialize(Ar& ar) {
		serializer(ar);
	}
};

struct ConfigBroadcastSnapshotRequest {
	static constexpr FileIdentifier file_identifier = 10911925;
	Version version{ 0 };
	std::map<ConfigKey, KnobValue> snapshot;
	ReplyPromise<ConfigBroadcastSnapshotReply> reply;

	ConfigBroadcastSnapshotRequest() = default;
	template <class Snapshot>
	explicit ConfigBroadcastSnapshotRequest(Version version, Snapshot&& snapshot)
	  : version(version), snapshot(std::forward<Snapshot>(snapshot)) {}

	template <class Ar>
	void serialize(Ar& ar) {
		serializer(ar, version, snapshot, reply);
	}
};

struct ConfigBroadcastChangesReply {
	static constexpr FileIdentifier file_identifier = 4014928;

	ConfigBroadcastChangesReply() = default;

	template <class Ar>
	void serialize(Ar& ar) {
		serializer(ar);
	}
};

struct ConfigBroadcastChangesRequest {
	static constexpr FileIdentifier file_identifier = 601281;
	Version mostRecentVersion;
	Standalone<VectorRef<VersionedConfigMutationRef>> changes;
	ReplyPromise<ConfigBroadcastChangesReply> reply;

	ConfigBroadcastChangesRequest() = default;
	explicit ConfigBroadcastChangesRequest(Version mostRecentVersion,
	                                       Standalone<VectorRef<VersionedConfigMutationRef>> const& changes)
	  : mostRecentVersion(mostRecentVersion), changes(changes) {}

	template <class Ar>
	void serialize(Ar& ar) {
		serializer(ar, mostRecentVersion, changes, reply);
	}
};

/*
 * The ConfigBroadcaster uses a ConfigBroadcastInterface from each worker to
 * push updates made to the configuration database to the worker.
 */
class ConfigBroadcastInterface {
	UID _id;

public:
	static constexpr FileIdentifier file_identifier = 1676543;
	RequestStream<ConfigBroadcastSnapshotRequest> snapshot;
	RequestStream<ConfigBroadcastChangesRequest> changes;

	ConfigBroadcastInterface() : _id(deterministicRandom()->randomUniqueID()) {}

	bool operator==(ConfigBroadcastInterface const& rhs) const { return (_id == rhs._id); }
	bool operator!=(ConfigBroadcastInterface const& rhs) const { return !(*this == rhs); }
	UID id() const { return _id; }

	template <class Ar>
	void serialize(Ar& ar) {
		serializer(ar, _id, snapshot, changes);
	}
};