get_replica_strategy.hxx

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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *   Copyright 2026-Present Couchbase, Inc.
 *
 *   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 <cstddef>
 
namespace couchbase
{
enum class replica_index {
  first = 0,
  second = 1,
  third = 2,
};

struct get_replica_strategy_from_index_options {
  struct built {
    bool wrap;
  };

  auto wrap(bool value) -> get_replica_strategy_from_index_options&
  {
    wrap_ = value;
    return *this;
  }

  [[nodiscard]] auto build() const -> built
  {
    return { wrap_ };
  }
 
private:
  bool wrap_{ false };
};

class get_replica_strategy
{
public:
  [[nodiscard]] static auto from_index(replica_index index,
                                       const get_replica_strategy_from_index_options& options = {})
    -> get_replica_strategy
  {
    return get_replica_strategy{ static_cast<std::size_t>(index), options.build() };
  }

  struct built {
    std::size_t replica_index;
    bool wrap;
  };

  [[nodiscard]] auto build() const -> built
  {
    return built_;
  }
 
private:
  get_replica_strategy(std::size_t index,
                       const get_replica_strategy_from_index_options::built& options)
    : built_{ index, options.wrap }
  {
  }
 
  built built_;
};
} // namespace couchbase