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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/base/status.h"
#include "mongo/transport/message_compressor_base.h"
#include "mongo/util/string_map.h"
#include <array>
#include <limits>
#include <map>
#include <memory>
#include <string>
#include <vector>
namespace mongo {
namespace optionenvironment {
class OptionSection;
class Environment;
} // namespace optionenvironment
namespace moe = mongo::optionenvironment;
/*
* The MessageCompressorRegistry holds the global registrations of compressors for a process.
*/
class MessageCompressorRegistry {
MessageCompressorRegistry(const MessageCompressorRegistry&) = delete;
MessageCompressorRegistry& operator=(const MessageCompressorRegistry&) = delete;
public:
MessageCompressorRegistry() = default;
MessageCompressorRegistry(MessageCompressorRegistry&&) = default;
MessageCompressorRegistry& operator=(MessageCompressorRegistry&&) = default;
/*
* Returns the global MessageCompressorRegistry
*/
static MessageCompressorRegistry& get();
/*
* Registers a new implementation of a MessageCompressor with the registry. This only gets
* called during startup. It is an error to call this twice with compressors with the same name
* or ID numbers.
*
* This method is not thread-safe and should only be called from a single-threaded context
* (a MONGO_INITIALIZER).
*/
void registerImplementation(std::unique_ptr<MessageCompressorBase> impl);
/*
* Returns the list of compressor names that have been registered and configured.
*
* Iterators and value in this vector may be invalidated by calls to:
* setSupportedCompressors
* finalizeSupportedCompressors
*/
const std::vector<std::string>& getCompressorNames() const;
/*
* Returns a compressor given an ID number. If no compressor exists with the ID number, it
* returns nullptr
*/
MessageCompressorBase* getCompressor(MessageCompressorId id) const;
/* Returns a compressor given a name. If no compressor with that name exists, it returns
* nullptr
*/
MessageCompressorBase* getCompressor(StringData name) const;
/*
* Sets the list of supported compressors for this registry. Should be called during
* option parsing and before calling registerImplementation for any compressors.
*/
void setSupportedCompressors(std::vector<std::string>&& compressorNames);
/*
* Finalizes the list of supported compressors for this registry. Should be called after all
* calls to registerImplementation. It will remove any compressor names that aren't keys in
* the _compressors map.
*/
Status finalizeSupportedCompressors();
private:
StringMap<MessageCompressorBase*> _compressorsByName;
std::array<std::unique_ptr<MessageCompressorBase>,
std::numeric_limits<MessageCompressorId>::max() + 1>
_compressorsByIds;
std::vector<std::string> _compressorNames;
};
Status storeMessageCompressionOptions(const std::string& compressors);
void appendMessageCompressionStats(BSONObjBuilder* b);
} // namespace mongo
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