Program Listing for File polling_manager.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__EMAIL__POLLING_MANAGER_HPP_
#define EMAIL__EMAIL__POLLING_MANAGER_HPP_

#include <atomic>
#include <chrono>
#include <functional>
#include <memory>
#include <mutex>
#include <optional>  // NOLINT cpplint mistakes <optional> for a C system header
#include <string>
#include <thread>
#include <vector>

#include "email/email/info.hpp"
#include "email/email/receiver.hpp"
#include "email/log.hpp"
#include "email/macros.hpp"
#include "email/visibility_control.hpp"

namespace email
{


class PollingManager
{
public:

  explicit PollingManager(
    std::shared_ptr<EmailReceiver> receiver,
    const std::optional<std::chrono::nanoseconds> polling_period);

  ~PollingManager();

  using HandlerFunction = std::function<void (const struct EmailData &)>;


  void
  register_handler(const HandlerFunction & handler);


  bool
  has_started() const;

  void
  start();

  void
  shutdown();

private:
  EMAIL_DISABLE_COPY(PollingManager)


  void
  poll_thread();

  std::shared_ptr<EmailReceiver> receiver_;
  const std::optional<std::chrono::nanoseconds> polling_period_;
  bool has_started_;
  std::atomic_bool do_shutdown_;
  std::thread thread_;
  std::mutex handlers_mutex_;
  std::vector<HandlerFunction> handlers_;
  std::shared_ptr<Logger> logger_;
};

}  // namespace email

#endif  // EMAIL__EMAIL__POLLING_MANAGER_HPP_