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//
// reference_counted.cpp
// ~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2017 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 <boost/bind.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/shared_ptr.hpp>
#include <iostream>
#include <vector>
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:
boost::shared_ptr<std::vector<char> > data_;
boost::asio::const_buffer buffer_;
};
class session
: public boost::enable_shared_from_this<session>
{
public:
session(boost::asio::io_context& io_context)
: socket_(io_context)
{
}
tcp::socket& socket()
{
return socket_;
}
void start()
{
using namespace std; // For time_t, time and ctime.
time_t now = time(0);
shared_const_buffer buffer(ctime(&now));
boost::asio::async_write(socket_, buffer,
boost::bind(&session::handle_write, shared_from_this()));
}
void handle_write()
{
}
private:
// The socket used to communicate with the client.
tcp::socket socket_;
};
typedef boost::shared_ptr<session> session_ptr;
class server
{
public:
server(boost::asio::io_context& io_context, short port)
: io_context_(io_context),
acceptor_(io_context, tcp::endpoint(tcp::v4(), port))
{
session_ptr new_session(new session(io_context_));
acceptor_.async_accept(new_session->socket(),
boost::bind(&server::handle_accept, this, new_session,
boost::asio::placeholders::error));
}
void handle_accept(session_ptr new_session,
const boost::system::error_code& error)
{
if (!error)
{
new_session->start();
}
new_session.reset(new session(io_context_));
acceptor_.async_accept(new_session->socket(),
boost::bind(&server::handle_accept, this, new_session,
boost::asio::placeholders::error));
}
private:
boost::asio::io_context& io_context_;
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;
using namespace std; // For atoi.
server s(io_context, atoi(argv[1]));
io_context.run();
}
catch (std::exception& e)
{
std::cerr << "Exception: " << e.what() << "\n";
}
return 0;
}
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