read_preference.hpp

// Copyright 2014 MongoDB 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 <chrono>
#include <cstdint>
#include <memory>
#include <string>

#include <bsoncxx/document/view_or_value.hpp>
#include <bsoncxx/stdx/optional.hpp>
#include <mongocxx/stdx.hpp>

#include <mongocxx/config/prelude.hpp>

namespace mongocxx {
MONGOCXX_INLINE_NAMESPACE_BEGIN

class client;
class collection;
class database;
class uri;

class MONGOCXX_API read_preference {
   public:
    enum class read_mode : std::uint8_t {
        k_primary = 0x01,

        k_primary_preferred = 0x05,

        k_secondary = 0x02,

        k_secondary_preferred = 0x06,

        k_nearest = 0x0A
    };

    explicit read_preference(read_mode mode = read_mode::k_primary);

    read_preference(read_mode mode, bsoncxx::document::view_or_value tags);

    read_preference(const read_preference&);

    read_preference& operator=(const read_preference&);

    read_preference(read_preference&&) noexcept;

    read_preference& operator=(read_preference&&) noexcept;

    ~read_preference();

    void mode(read_mode mode);

    read_mode mode() const;

    void tags(bsoncxx::document::view_or_value tags);

    stdx::optional<bsoncxx::document::view> tags() const;

    void max_staleness(std::chrono::seconds max_staleness);

    stdx::optional<std::chrono::seconds> max_staleness() const;

   private:
    friend client;
    friend collection;
    friend database;
    friend uri;
    friend MONGOCXX_API bool MONGOCXX_CALL
    operator==(const read_preference&, const read_preference&);

    class MONGOCXX_PRIVATE impl;

    MONGOCXX_PRIVATE read_preference(std::unique_ptr<impl>&& implementation);

    std::unique_ptr<impl> _impl;
};

MONGOCXX_INLINE_NAMESPACE_END
}  // namespace mongocxx

#include <mongocxx/config/postlude.hpp>