text: // Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
  // Distributed under the MIT License (http://opensource.org/licenses/MIT)
  
  #pragma once
  
  #ifndef SPDLOG_HEADER_ONLY
  #include <spdlog/async_logger.h>
  #endif
  
  #include <spdlog/sinks/sink.h>
  #include <spdlog/details/thread_pool.h>
  
  #include <memory>
  #include <string>
  
  SPDLOG_INLINE spdlog::async_logger::async_logger(
      std::string logger_name, sinks_init_list sinks_list, std::weak_ptr<details::thread_pool> tp, async_overflow_policy overflow_policy)
      : async_logger(std::move(logger_name), sinks_list.begin(), sinks_list.end(), std::move(tp), overflow_policy)
  {}
  
  SPDLOG_INLINE spdlog::async_logger::async_logger(
      std::string logger_name, sink_ptr single_sink, std::weak_ptr<details::thread_pool> tp, async_overflow_policy overflow_policy)
      : async_logger(std::move(logger_name), {std::move(single_sink)}, std::move(tp), overflow_policy)
  {}
  
  // send the log message to the thread pool
  SPDLOG_INLINE void spdlog::async_logger::sink_it_(const details::log_msg &msg)
  {
      if (auto pool_ptr = thread_pool_.lock())
      {
          pool_ptr->post_log(shared_from_this(), msg, overflow_policy_);
      }
      else
      {
          SPDLOG_THROW(spdlog_ex("async log: thread pool doesn't exist anymore"));
      }
  }
  
  // send flush request to the thread pool
  SPDLOG_INLINE void spdlog::async_logger::flush_()
  {
      if (auto pool_ptr = thread_pool_.lock())
      {
          pool_ptr->post_flush(shared_from_this(), overflow_policy_);
      }
      else
      {
          SPDLOG_THROW(spdlog_ex("async flush: thread pool doesn't exist anymore"));
      }
  }
  
  //
  // backend functions - called from the thread pool to do the actual job
  //
  SPDLOG_INLINE void spdlog::async_logger::backend_sink_it_(const details::log_msg &msg)
  {
      for (auto &sink : sinks_)
      {
          if (sink->should_log(msg.level))
          {
              SPDLOG_TRY
              {
                  sink->log(msg);
              }
              SPDLOG_LOGGER_CATCH()
          }
      }
  
      if (should_flush_(msg))
      {
          backend_flush_();
      }
  }
  
  SPDLOG_INLINE void spdlog::async_logger::backend_flush_()
  {
      for (auto &sink : sinks_)
      {
          SPDLOG_TRY
          {
              sink->flush();
          }
          SPDLOG_LOGGER_CATCH()
      }
  }
  
  SPDLOG_INLINE std::shared_ptr<spdlog::logger> spdlog::async_logger::clone(std::string new_name)
  {
      auto cloned = std::make_shared<spdlog::async_logger>(*this);
      cloned->name_ = std::move(new_name);
      return cloned;
  }
  