Program Listing for File subscription.hpp

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// Copyright 2020-2021 Christophe Bedard
//
// 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.

#ifndef EMAIL__SUBSCRIPTION_HPP_
#define EMAIL__SUBSCRIPTION_HPP_

#include <chrono>
#include <memory>
#include <optional>  // NOLINT cpplint mistakes <optional> for a C system header
#include <string>
#include <utility>

#include "email/email/info.hpp"
#include "email/log.hpp"
#include "email/macros.hpp"
#include "email/message_info.hpp"
#include "email/pub_sub.hpp"
#include "email/safe_queue.hpp"
#include "email/subscription_handler.hpp"
#include "email/visibility_control.hpp"

namespace email
{


class Subscription : public PubSubObject
{
public:

  EMAIL_PUBLIC
  explicit Subscription(const std::string & topic_name);

  EMAIL_PUBLIC
  virtual ~Subscription();


  EMAIL_PUBLIC
  bool
  has_message() const;


  EMAIL_PUBLIC
  std::optional<std::string>
  get_message();


  EMAIL_PUBLIC
  std::optional<std::pair<std::string, MessageInfo>>
  get_message_with_info();

private:
  EMAIL_DISABLE_COPY(Subscription)

  std::shared_ptr<Logger> logger_;
  SubscriptionHandler::MessageQueue::SharedPtr messages_;
};

}  // namespace email

#endif  // EMAIL__SUBSCRIPTION_HPP_