Program Listing for File subscription_handler.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_HANDLER_HPP_
#define EMAIL__SUBSCRIPTION_HANDLER_HPP_

#include <map>
#include <memory>
#include <mutex>
#include <string>
#include <unordered_map>
#include <utility>

#include "email/email/handler.hpp"
#include "email/email/info.hpp"
#include "email/email/polling_manager.hpp"
#include "email/safe_queue.hpp"
#include "email/log.hpp"
#include "email/macros.hpp"
#include "email/message_info.hpp"
#include "email/visibility_control.hpp"

namespace email
{


class SubscriptionHandler : public EmailHandler,
  public std::enable_shared_from_this<SubscriptionHandler>
{
public:
  using MessageQueue = SafeQueue<std::pair<std::string, MessageInfo>>;

  SubscriptionHandler();

  virtual ~SubscriptionHandler();


  void
  register_subscription(
    const std::string & topic_name,
    MessageQueue::WeakPtr message_queue);

  virtual
  void
  register_handler(std::shared_ptr<PollingManager> polling_manager);


  virtual
  void
  handle(const struct EmailData & data);

private:
  EMAIL_DISABLE_COPY(SubscriptionHandler)

  std::shared_ptr<Logger> logger_;
  mutable std::mutex subscriptions_mutex_;
  std::unordered_multimap<std::string, MessageQueue::WeakPtr> subscriptions_;
};

}  // namespace email

#endif  // EMAIL__SUBSCRIPTION_HANDLER_HPP_