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Full merge from trunk at revision 41356 of entire boost-root tree.
[SVN r41369]
This commit is contained in:
Beman Dawes
@@ -1,237 +0,0 @@
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//
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// server.cpp
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// ~~~~~~~~~~
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//
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// Copyright (c) 2003-2007 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#include <cstdlib>
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#include <iostream>
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#include <boost/aligned_storage.hpp>
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#include <boost/array.hpp>
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#include <boost/bind.hpp>
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#include <boost/enable_shared_from_this.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/asio.hpp>
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using boost::asio::ip::tcp;
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// Class to manage the memory to be used for handler-based custom allocation.
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// It contains a single block of memory which may be returned for allocation
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// requests. If the memory is in use when an allocation request is made, the
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// allocator delegates allocation to the global heap.
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class handler_allocator
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: private boost::noncopyable
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{
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public:
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handler_allocator()
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: in_use_(false)
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{
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}
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void* allocate(std::size_t size)
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{
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if (!in_use_ && size < storage_.size)
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{
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in_use_ = true;
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return storage_.address();
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}
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else
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{
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return ::operator new(size);
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}
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}
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void deallocate(void* pointer)
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{
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if (pointer == storage_.address())
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{
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in_use_ = false;
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}
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else
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{
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::operator delete(pointer);
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}
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}
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private:
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// Storage space used for handler-based custom memory allocation.
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boost::aligned_storage<1024> storage_;
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// Whether the handler-based custom allocation storage has been used.
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bool in_use_;
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};
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// Wrapper class template for handler objects to allow handler memory
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// allocation to be customised. Calls to operator() are forwarded to the
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// encapsulated handler.
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template <typename Handler>
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class custom_alloc_handler
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{
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public:
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custom_alloc_handler(handler_allocator& a, Handler h)
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: allocator_(a),
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handler_(h)
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{
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}
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template <typename Arg1>
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void operator()(Arg1 arg1)
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{
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handler_(arg1);
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}
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template <typename Arg1, typename Arg2>
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void operator()(Arg1 arg1, Arg2 arg2)
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{
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handler_(arg1, arg2);
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}
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friend void* asio_handler_allocate(std::size_t size,
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custom_alloc_handler<Handler>* this_handler)
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{
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return this_handler->allocator_.allocate(size);
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}
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friend void asio_handler_deallocate(void* pointer, std::size_t /*size*/,
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custom_alloc_handler<Handler>* this_handler)
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{
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this_handler->allocator_.deallocate(pointer);
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}
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private:
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handler_allocator& allocator_;
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Handler handler_;
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};
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// Helper function to wrap a handler object to add custom allocation.
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template <typename Handler>
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inline custom_alloc_handler<Handler> make_custom_alloc_handler(
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handler_allocator& a, Handler h)
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{
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return custom_alloc_handler<Handler>(a, h);
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}
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class session
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: public boost::enable_shared_from_this<session>
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{
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public:
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session(boost::asio::io_service& io_service)
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: socket_(io_service)
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{
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}
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tcp::socket& socket()
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{
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return socket_;
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}
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void start()
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{
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socket_.async_read_some(boost::asio::buffer(data_),
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make_custom_alloc_handler(allocator_,
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boost::bind(&session::handle_read,
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shared_from_this(),
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred)));
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}
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void handle_read(const boost::system::error_code& error,
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size_t bytes_transferred)
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{
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if (!error)
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{
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boost::asio::async_write(socket_,
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boost::asio::buffer(data_, bytes_transferred),
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make_custom_alloc_handler(allocator_,
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boost::bind(&session::handle_write,
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shared_from_this(),
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boost::asio::placeholders::error)));
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}
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}
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void handle_write(const boost::system::error_code& error)
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{
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if (!error)
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{
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socket_.async_read_some(boost::asio::buffer(data_),
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make_custom_alloc_handler(allocator_,
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boost::bind(&session::handle_read,
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shared_from_this(),
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boost::asio::placeholders::error,
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boost::asio::placeholders::bytes_transferred)));
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}
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}
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private:
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// The socket used to communicate with the client.
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tcp::socket socket_;
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// Buffer used to store data received from the client.
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boost::array<char, 1024> data_;
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// The allocator to use for handler-based custom memory allocation.
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handler_allocator allocator_;
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};
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typedef boost::shared_ptr<session> session_ptr;
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class server
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{
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public:
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server(boost::asio::io_service& io_service, short port)
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: io_service_(io_service),
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acceptor_(io_service, tcp::endpoint(tcp::v4(), port))
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{
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session_ptr new_session(new session(io_service_));
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acceptor_.async_accept(new_session->socket(),
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boost::bind(&server::handle_accept, this, new_session,
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boost::asio::placeholders::error));
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}
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void handle_accept(session_ptr new_session,
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const boost::system::error_code& error)
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{
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if (!error)
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{
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new_session->start();
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new_session.reset(new session(io_service_));
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acceptor_.async_accept(new_session->socket(),
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boost::bind(&server::handle_accept, this, new_session,
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boost::asio::placeholders::error));
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}
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}
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private:
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boost::asio::io_service& io_service_;
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tcp::acceptor acceptor_;
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};
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int main(int argc, char* argv[])
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{
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try
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{
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if (argc != 2)
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{
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std::cerr << "Usage: server <port>\n";
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return 1;
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}
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boost::asio::io_service io_service;
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using namespace std; // For atoi.
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server s(io_service, atoi(argv[1]));
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io_service.run();
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}
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catch (std::exception& e)
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{
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std::cerr << "Exception: " << e.what() << "\n";
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}
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return 0;
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}
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