common_options.hxx

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/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *   Copyright 2020-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 <couchbase/retry_strategy.hxx>
#include <couchbase/tracing/request_span.hxx>
 
#include <chrono>
#include <memory>
#include <optional>
#include <type_traits>
 
namespace couchbase
{
template<typename derived_class>
class common_options
{
public:
  auto timeout(const std::chrono::milliseconds timeout) -> derived_class&
  {
    timeout_ = timeout;
    return self();
  }

  auto retry_strategy(const std::shared_ptr<retry_strategy> strategy) -> derived_class&
  {
    retry_strategy_ = strategy;
    return self();
  }

  auto parent_span(std::shared_ptr<tracing::request_span> span) -> derived_class&
  {
    parent_span_ = std::move(span);
    return self();
  }

  struct built {
    const std::optional<std::chrono::milliseconds> timeout;
    const std::shared_ptr<couchbase::retry_strategy> retry_strategy;
    const std::shared_ptr<tracing::request_span> parent_span;
  };
 
protected:
  [[nodiscard]] auto build_common_options() const -> built
  {
    return { timeout_, retry_strategy_, parent_span_ };
  }

  auto self() -> derived_class&
  {
    return *static_cast<derived_class*>(this);
  }
 
private:
  std::optional<std::chrono::milliseconds> timeout_{};
  std::shared_ptr<couchbase::retry_strategy> retry_strategy_{ nullptr };
  std::shared_ptr<tracing::request_span> parent_span_{ nullptr };
};
 
} // namespace couchbase