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<title>Daytime.7 - A combined TCP/UDP asynchronous server</title>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.tutorial.tutdaytime7"></a><a class="link" href="tutdaytime7.html" title="Daytime.7 - A combined TCP/UDP asynchronous server">Daytime.7 - A combined
TCP/UDP asynchronous server</a>
</h3></div></div></div>
<p>
This tutorial program shows how to combine the two asynchronous servers that
we have just written, into a single server application.
</p>
<h5>
<a name="boost_asio.tutorial.tutdaytime7.h0"></a>
<span class="phrase"><a name="boost_asio.tutorial.tutdaytime7.the_main___function"></a></span><a class="link" href="tutdaytime7.html#boost_asio.tutorial.tutdaytime7.the_main___function">The
main() function</a>
</h5>
<pre class="programlisting">int main()
{
try
{
boost::asio::io_context io_context;
</pre>
<p>
We will begin by creating a server object to accept a TCP client connection.
</p>
<pre class="programlisting"> tcp_server server1(io_context);
</pre>
<p>
We also need a server object to accept a UDP client request.
</p>
<pre class="programlisting"> udp_server server2(io_context);
</pre>
<p>
We have created two lots of work for the <a class="link" href="../reference/io_context.html" title="io_context">io_context</a>
object to do.
</p>
<pre class="programlisting"> io_context.run();
}
catch (std::exception&amp; e)
{
std::cerr &lt;&lt; e.what() &lt;&lt; std::endl;
}
return 0;
}
</pre>
<h5>
<a name="boost_asio.tutorial.tutdaytime7.h1"></a>
<span class="phrase"><a name="boost_asio.tutorial.tutdaytime7.the_tcp_connection_and_tcp_server_classes"></a></span><a class="link" href="tutdaytime7.html#boost_asio.tutorial.tutdaytime7.the_tcp_connection_and_tcp_server_classes">The
tcp_connection and tcp_server classes</a>
</h5>
<p>
The following two classes are taken from <a class="link" href="tutdaytime3.html" title="Daytime.3 - An asynchronous TCP daytime server">Daytime.3</a>
.
</p>
<pre class="programlisting">class tcp_connection
: public boost::enable_shared_from_this&lt;tcp_connection&gt;
{
public:
typedef boost::shared_ptr&lt;tcp_connection&gt; pointer;
static pointer create(boost::asio::io_context&amp; io_context)
{
return pointer(new tcp_connection(io_context));
}
tcp::socket&amp; socket()
{
return socket_;
}
void start()
{
message_ = make_daytime_string();
boost::asio::async_write(socket_, boost::asio::buffer(message_),
boost::bind(&amp;tcp_connection::handle_write, shared_from_this()));
}
private:
tcp_connection(boost::asio::io_context&amp; io_context)
: socket_(io_context)
{
}
void handle_write()
{
}
tcp::socket socket_;
std::string message_;
};
class tcp_server
{
public:
tcp_server(boost::asio::io_context&amp; io_context)
: io_context_(io_context),
acceptor_(io_context, tcp::endpoint(tcp::v4(), 13))
{
start_accept();
}
private:
void start_accept()
{
tcp_connection::pointer new_connection =
tcp_connection::create(io_context_);
acceptor_.async_accept(new_connection-&gt;socket(),
boost::bind(&amp;tcp_server::handle_accept, this, new_connection,
boost::asio::placeholders::error));
}
void handle_accept(tcp_connection::pointer new_connection,
const boost::system::error_code&amp; error)
{
if (!error)
{
new_connection-&gt;start();
}
start_accept();
}
boost::asio::io_context&amp; io_context_;
tcp::acceptor acceptor_;
};
</pre>
<h5>
<a name="boost_asio.tutorial.tutdaytime7.h2"></a>
<span class="phrase"><a name="boost_asio.tutorial.tutdaytime7.the_udp_server_class"></a></span><a class="link" href="tutdaytime7.html#boost_asio.tutorial.tutdaytime7.the_udp_server_class">The udp_server
class</a>
</h5>
<p>
Similarly, this next class is taken from the <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">previous
tutorial step</a> .
</p>
<pre class="programlisting">class udp_server
{
public:
udp_server(boost::asio::io_context&amp; io_context)
: socket_(io_context, udp::endpoint(udp::v4(), 13))
{
start_receive();
}
private:
void start_receive()
{
socket_.async_receive_from(
boost::asio::buffer(recv_buffer_), remote_endpoint_,
boost::bind(&amp;udp_server::handle_receive, this,
boost::asio::placeholders::error));
}
void handle_receive(const boost::system::error_code&amp; error)
{
if (!error)
{
boost::shared_ptr&lt;std::string&gt; message(
new std::string(make_daytime_string()));
socket_.async_send_to(boost::asio::buffer(*message), remote_endpoint_,
boost::bind(&amp;udp_server::handle_send, this, message));
start_receive();
}
}
void handle_send(boost::shared_ptr&lt;std::string&gt; /*message*/)
{
}
udp::socket socket_;
udp::endpoint remote_endpoint_;
boost::array&lt;char, 1&gt; recv_buffer_;
};
</pre>
<p>
See the <a class="link" href="tutdaytime7/src.html" title="Source listing for Daytime.7">full source listing</a>
</p>
<p>
Return to the <a class="link" href="../tutorial.html" title="Tutorial">tutorial index</a>
</p>
<p>
Previous: <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">Daytime.6 - An
asynchronous UDP daytime server</a>
</p>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2021 Christopher
M. Kohlhoff<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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