text: /*
   * The MIT License (MIT)
   *
   * Copyright (c) 2015 Microsoft Corporation
   *
   * -=- Robust Distributed System Nucleus (rDSN) -=-
   *
   * 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.
   */
  
  /*
   * Description:
   *     What is this file about?
   *
   * Revision history:
   *     xxxx-xx-xx, author, first version
   *     xxxx-xx-xx, author, fix bug about xxx
   */
  
  #pragma once
  
  #include <dsn/tool_api.h>
  #include <boost/asio.hpp>
  
  namespace dsn {
  namespace tools {
  
  class asio_network_provider : public connection_oriented_network
  {
  public:
      asio_network_provider(rpc_engine *srv, network *inner_provider);
  
      virtual error_code
      start(rpc_channel channel, int port, bool client_only, io_modifer &ctx) override;
      virtual ::dsn::rpc_address address() override { return _address; }
      virtual rpc_session_ptr create_client_session(::dsn::rpc_address server_addr) override;
  
  private:
      void do_accept();
  
  private:
      friend class asio_rpc_session;
  
      std::shared_ptr<boost::asio::ip::tcp::acceptor> _acceptor;
      boost::asio::io_service _io_service;
      std::vector<std::shared_ptr<std::thread>> _workers;
      ::dsn::rpc_address _address;
  };
  
  class asio_udp_provider : public network
  {
  public:
      asio_udp_provider(rpc_engine *srv, network *inner_provider);
  
      virtual ~asio_udp_provider();
  
      void send_message(message_ex *request) override;
  
      virtual error_code
      start(rpc_channel channel, int port, bool client_only, io_modifer &ctx) override;
  
      virtual ::dsn::rpc_address address() override { return _address; }
  
      virtual void inject_drop_message(message_ex *msg, bool is_send) override
      {
          // nothing to do for UDP
      }
  
  private:
      void do_receive();
  
      // create parser on demand
      message_parser *get_message_parser(network_header_format hdr_format);
  
      bool _is_client;
      boost::asio::io_service _io_service;
      std::shared_ptr<boost::asio::ip::udp::socket> _socket;
      std::vector<std::shared_ptr<std::thread>> _workers;
      ::dsn::rpc_address _address;
      message_reader _recv_reader;
  
      ::dsn::utils::ex_lock_nr _lock; // [
      message_parser **_parsers;
      // ]
  
      static const size_t max_udp_packet_size = 1000;
  };
  }
  }
  