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- //
- // reference_counted.cpp
- // ~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- #include <boost/asio.hpp>
- #include <iostream>
- #include <memory>
- #include <utility>
- #include <vector>
- #include <ctime>
- using boost::asio::ip::tcp;
- // A reference-counted non-modifiable buffer class.
- class shared_const_buffer
- {
- public:
- // Construct from a std::string.
- explicit shared_const_buffer(const std::string& data)
- : data_(new std::vector<char>(data.begin(), data.end())),
- buffer_(boost::asio::buffer(*data_))
- {
- }
- // Implement the ConstBufferSequence requirements.
- typedef boost::asio::const_buffer value_type;
- typedef const boost::asio::const_buffer* const_iterator;
- const boost::asio::const_buffer* begin() const { return &buffer_; }
- const boost::asio::const_buffer* end() const { return &buffer_ + 1; }
- private:
- std::shared_ptr<std::vector<char> > data_;
- boost::asio::const_buffer buffer_;
- };
- class session
- : public std::enable_shared_from_this<session>
- {
- public:
- session(tcp::socket socket)
- : socket_(std::move(socket))
- {
- }
- void start()
- {
- do_write();
- }
- private:
- void do_write()
- {
- std::time_t now = std::time(0);
- shared_const_buffer buffer(std::ctime(&now));
- auto self(shared_from_this());
- boost::asio::async_write(socket_, buffer,
- [self](boost::system::error_code /*ec*/, std::size_t /*length*/)
- {
- });
- }
- // The socket used to communicate with the client.
- tcp::socket socket_;
- };
- class server
- {
- public:
- server(boost::asio::io_context& io_context, short port)
- : acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
- {
- do_accept();
- }
- private:
- void do_accept()
- {
- acceptor_.async_accept(
- [this](boost::system::error_code ec, tcp::socket socket)
- {
- if (!ec)
- {
- std::make_shared<session>(std::move(socket))->start();
- }
- do_accept();
- });
- }
- tcp::acceptor acceptor_;
- };
- int main(int argc, char* argv[])
- {
- try
- {
- if (argc != 2)
- {
- std::cerr << "Usage: reference_counted <port>\n";
- return 1;
- }
- boost::asio::io_context io_context;
- server s(io_context, std::atoi(argv[1]));
- io_context.run();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
- return 0;
- }
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