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-//
-// server.cpp
-// ~~~~~~~~~~
-//
-// Copyright (c) 2003-2015 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 <array>
-#include <cstdlib>
-#include <iostream>
-#include <memory>
-#include <type_traits>
-#include <utility>
-#include <boost/asio.hpp>
-
-using boost::asio::ip::tcp;
-
-// Class to manage the memory to be used for handler-based custom allocation.
-// It contains a single block of memory which may be returned for allocation
-// requests. If the memory is in use when an allocation request is made, the
-// allocator delegates allocation to the global heap.
-class handler_allocator
-{
-public:
- handler_allocator()
- : in_use_(false)
- {
- }
-
- handler_allocator(const handler_allocator&) = delete;
- handler_allocator& operator=(const handler_allocator&) = delete;
-
- void* allocate(std::size_t size)
- {
- if (!in_use_ && size < sizeof(storage_))
- {
- in_use_ = true;
- return &storage_;
- }
- else
- {
- return ::operator new(size);
- }
- }
-
- void deallocate(void* pointer)
- {
- if (pointer == &storage_)
- {
- in_use_ = false;
- }
- else
- {
- ::operator delete(pointer);
- }
- }
-
-private:
- // Storage space used for handler-based custom memory allocation.
- typename std::aligned_storage<1024>::type storage_;
-
- // Whether the handler-based custom allocation storage has been used.
- bool in_use_;
-};
-
-// Wrapper class template for handler objects to allow handler memory
-// allocation to be customised. Calls to operator() are forwarded to the
-// encapsulated handler.
-template <typename Handler>
-class custom_alloc_handler
-{
-public:
- custom_alloc_handler(handler_allocator& a, Handler h)
- : allocator_(a),
- handler_(h)
- {
- }
-
- template <typename ...Args>
- void operator()(Args&&... args)
- {
- handler_(std::forward<Args>(args)...);
- }
-
- friend void* asio_handler_allocate(std::size_t size,
- custom_alloc_handler<Handler>* this_handler)
- {
- return this_handler->allocator_.allocate(size);
- }
-
- friend void asio_handler_deallocate(void* pointer, std::size_t /*size*/,
- custom_alloc_handler<Handler>* this_handler)
- {
- this_handler->allocator_.deallocate(pointer);
- }
-
-private:
- handler_allocator& allocator_;
- Handler handler_;
-};
-
-// Helper function to wrap a handler object to add custom allocation.
-template <typename Handler>
-inline custom_alloc_handler<Handler> make_custom_alloc_handler(
- handler_allocator& a, Handler h)
-{
- return custom_alloc_handler<Handler>(a, h);
-}
-
-class session
- : public std::enable_shared_from_this<session>
-{
-public:
- session(tcp::socket socket)
- : socket_(std::move(socket))
- {
- }
-
- void start()
- {
- do_read();
- }
-
-private:
- void do_read()
- {
- auto self(shared_from_this());
- socket_.async_read_some(boost::asio::buffer(data_),
- make_custom_alloc_handler(allocator_,
- [this, self](boost::system::error_code ec, std::size_t length)
- {
- if (!ec)
- {
- do_write(length);
- }
- }));
- }
-
- void do_write(std::size_t length)
- {
- auto self(shared_from_this());
- boost::asio::async_write(socket_, boost::asio::buffer(data_, length),
- make_custom_alloc_handler(allocator_,
- [this, self](boost::system::error_code ec, std::size_t /*length*/)
- {
- if (!ec)
- {
- do_read();
- }
- }));
- }
-
- // The socket used to communicate with the client.
- tcp::socket socket_;
-
- // Buffer used to store data received from the client.
- std::array<char, 1024> data_;
-
- // The allocator to use for handler-based custom memory allocation.
- handler_allocator allocator_;
-};
-
-class server
-{
-public:
- server(boost::asio::io_service& io_service, short port)
- : acceptor_(io_service, tcp::endpoint(tcp::v4(), port)),
- socket_(io_service)
- {
- do_accept();
- }
-
-private:
- void do_accept()
- {
- acceptor_.async_accept(socket_,
- [this](boost::system::error_code ec)
- {
- if (!ec)
- {
- std::make_shared<session>(std::move(socket_))->start();
- }
-
- do_accept();
- });
- }
-
- tcp::acceptor acceptor_;
- tcp::socket socket_;
-};
-
-int main(int argc, char* argv[])
-{
- try
- {
- if (argc != 2)
- {
- std::cerr << "Usage: server <port>\n";
- return 1;
- }
-
- boost::asio::io_service io_service;
- server s(io_service, std::atoi(argv[1]));
- io_service.run();
- }
- catch (std::exception& e)
- {
- std::cerr << "Exception: " << e.what() << "\n";
- }
-
- return 0;
-}