text: /*
   * Copyright (c) 2010-2020 OTClient <https://github.com/edubart/otclient>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  
  #ifndef ASYNCDISPATCHER_H
  #define ASYNCDISPATCHER_H
  
  #include <future>
  #include <list>
  
  class AsyncDispatcher
  {
  public:
      void init();
      void terminate();
  
      void spawn_thread();
      void stop();
  
      template<class F>
      std::shared_future<typename std::invoke_result<F>::type> schedule(const F& task)
      {
          std::lock_guard lock(m_mutex);
          auto prom = std::make_shared<std::promise<typename std::invoke_result<F>::type>>();
          m_tasks.push_back([=]() { prom->set_value(task()); });
          m_condition.notify_all();
          return std::shared_future<typename std::invoke_result<F>::type>(prom->get_future());
      }
  
      void dispatch(const std::function<void()>& f)
      {
          std::lock_guard lock(m_mutex);
          m_tasks.push_back(f);
          m_condition.notify_all();
      }
  
  protected:
      void exec_loop();
  
  private:
      std::list<std::function<void()>> m_tasks;
      std::list<std::thread> m_threads;
      std::mutex m_mutex;
      std::condition_variable m_condition;
      bool m_running{ false };
  };
  
  extern AsyncDispatcher g_asyncDispatcher;
  
  #endif
  