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path: root/src/mongo/rpc/unique_message.h
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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 <memory>
#include <utility>

#include "mongo/rpc/message.h"
#include "mongo/rpc/reply_interface.h"

namespace mongo {
namespace rpc {

/**
 * A wrapper around an owned message that includes access to an associated ReplyInterface.
 */
template <typename MessageViewType>
class UniqueMessage {
    UniqueMessage(const UniqueMessage&) = delete;
    UniqueMessage& operator=(const UniqueMessage&) = delete;

public:
    UniqueMessage(Message message, std::unique_ptr<MessageViewType> view)
        : _message{std::move(message)}, _view{std::move(view)} {}

    UniqueMessage(UniqueMessage&&) = default;
    UniqueMessage& operator=(UniqueMessage&&) = default;

    const MessageViewType* operator->() const {
        return _view.get();
    }

    const MessageViewType& operator*() const {
        return *_view;
    }

    /**
     * Releases ownership of the underlying message. The result of calling any other methods
     * on the object afterward is undefined.
     */
    Message releaseMessage() {
        _view.reset();
        return std::move(_message);
    }

private:
    Message _message;
    std::unique_ptr<MessageViewType> _view;
};

using UniqueReply = UniqueMessage<ReplyInterface>;

}  // namespace rpc
}  // namespace mongo