text: /*
   *  Copyright (C) 2021 FISCO BCOS.
   *  SPDX-License-Identifier: Apache-2.0
   *  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.
   *
   * @file TopicManager.h
   * @author: octopus
   * @date 2021-08-23
   */
  #pragma once
  
  #include <boost/thread/thread.hpp>
  #include <memory>
  #include <mutex>
  #include <set>
  
  namespace bcos
  {
  namespace cppsdk
  {
  namespace amop
  {
  // manage the topics user subscribed
  class TopicManager
  {
  public:
      using Ptr = std::shared_ptr<TopicManager>;
  
      bool addTopic(const std::string& _topic);
      bool addTopics(const std::set<std::string>& _topics);
      bool removeTopic(const std::string& _topic);
      bool removeTopics(const std::set<std::string>& _topics);
      std::set<std::string> topics() const;
      std::string toJson();
  
  private:
      // mutex for m_sessions
      mutable boost::shared_mutex x_topics;
      std::set<std::string> m_topics;
  };
  
  }  // namespace amop
  }  // namespace cppsdk
  }  // namespace bcos