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  26 <div class="titlepage"><div><div><h3 class="title">
  27 <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
  28       TCP/UDP asynchronous server</a>
  29 </h3></div></div></div>
  30 <p>
  31         This tutorial program shows how to combine the two asynchronous servers that
  32         we have just written, into a single server application.
  33       </p>
  34 <h5>
  35 <a name="boost_asio.tutorial.tutdaytime7.h0"></a>
  36         <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
  37         main() function</a>
  38       </h5>
  39 <pre class="programlisting"><span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
  40 <span class="special">{</span>
  41   <span class="keyword">try</span>
  42   <span class="special">{</span>
  43     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span> <span class="identifier">io_service</span><span class="special">;</span>
  44 </pre>
  45 <p>
  46         We will begin by creating a server object to accept a TCP client connection.
  47       </p>
  48 <pre class="programlisting">    <span class="identifier">tcp_server</span> <span class="identifier">server1</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span>
  49 </pre>
  50 <p>
  51         We also need a server object to accept a UDP client request.
  52       </p>
  53 <pre class="programlisting">    <span class="identifier">udp_server</span> <span class="identifier">server2</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">);</span>
  54 </pre>
  55 <p>
  56         We have created two lots of work for the <a class="link" href="../reference/io_service.html" title="io_service">io_service</a>
  57         object to do.
  58       </p>
  59 <pre class="programlisting">    <span class="identifier">io_service</span><span class="special">.</span><span class="identifier">run</span><span class="special">();</span>
  60   <span class="special">}</span>
  61   <span class="keyword">catch</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">exception</span><span class="special">&amp;</span> <span class="identifier">e</span><span class="special">)</span>
  62   <span class="special">{</span>
  63     <span class="identifier">std</span><span class="special">::</span><span class="identifier">cerr</span> <span class="special">&lt;&lt;</span> <span class="identifier">e</span><span class="special">.</span><span class="identifier">what</span><span class="special">()</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
  64   <span class="special">}</span>
  65
  66   <span class="keyword">return</span> <span class="number">0</span><span class="special">;</span>
  67 <span class="special">}</span>
  68 </pre>
  69 <h5>
  70 <a name="boost_asio.tutorial.tutdaytime7.h1"></a>
  71         <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
  72         tcp_connection and tcp_server classes</a>
  73       </h5>
  74 <p>
  75         The following two classes are taken from <a class="link" href="tutdaytime3.html" title="Daytime.3 - An asynchronous TCP daytime server">Daytime.3</a>
  76         .
  77       </p>
  78 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">tcp_connection</span>
  79   <span class="special">:</span> <span class="keyword">public</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">enable_shared_from_this</span><span class="special">&lt;</span><span class="identifier">tcp_connection</span><span class="special">&gt;</span>
  80 <span class="special">{</span>
  81 <span class="keyword">public</span><span class="special">:</span>
  82   <span class="keyword">typedef</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">tcp_connection</span><span class="special">&gt;</span> <span class="identifier">pointer</span><span class="special">;</span>
  83
  84   <span class="keyword">static</span> <span class="identifier">pointer</span> <span class="identifier">create</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span><span class="special">&amp;</span> <span class="identifier">io_service</span><span class="special">)</span>
  85   <span class="special">{</span>
  86     <span class="keyword">return</span> <span class="identifier">pointer</span><span class="special">(</span><span class="keyword">new</span> <span class="identifier">tcp_connection</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">));</span>
  87   <span class="special">}</span>
  88
  89   <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span><span class="special">&amp;</span> <span class="identifier">socket</span><span class="special">()</span>
  90   <span class="special">{</span>
  91     <span class="keyword">return</span> <span class="identifier">socket_</span><span class="special">;</span>
  92   <span class="special">}</span>
  93
  94   <span class="keyword">void</span> <span class="identifier">start</span><span class="special">()</span>
  95   <span class="special">{</span>
  96     <span class="identifier">message_</span> <span class="special">=</span> <span class="identifier">make_daytime_string</span><span class="special">();</span>
  97
  98     <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">async_write</span><span class="special">(</span><span class="identifier">socket_</span><span class="special">,</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">message_</span><span class="special">),</span>
  99         <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">handle_write</span><span class="special">,</span> <span class="identifier">shared_from_this</span><span class="special">()));</span>
 100   <span class="special">}</span>
 101
 102 <span class="keyword">private</span><span class="special">:</span>
 103   <span class="identifier">tcp_connection</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span><span class="special">&amp;</span> <span class="identifier">io_service</span><span class="special">)</span>
 104     <span class="special">:</span> <span class="identifier">socket_</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">)</span>
 105   <span class="special">{</span>
 106   <span class="special">}</span>
 107
 108   <span class="keyword">void</span> <span class="identifier">handle_write</span><span class="special">()</span>
 109   <span class="special">{</span>
 110   <span class="special">}</span>
 111
 112   <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket_</span><span class="special">;</span>
 113   <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">message_</span><span class="special">;</span>
 114 <span class="special">};</span>
 115
 116 <span class="keyword">class</span> <span class="identifier">tcp_server</span>
 117 <span class="special">{</span>
 118 <span class="keyword">public</span><span class="special">:</span>
 119   <span class="identifier">tcp_server</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span><span class="special">&amp;</span> <span class="identifier">io_service</span><span class="special">)</span>
 120     <span class="special">:</span> <span class="identifier">acceptor_</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">,</span> <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">endpoint</span><span class="special">(</span><span class="identifier">tcp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span class="number">13</span><span class="special">))</span>
 121   <span class="special">{</span>
 122     <span class="identifier">start_accept</span><span class="special">();</span>
 123   <span class="special">}</span>
 124
 125 <span class="keyword">private</span><span class="special">:</span>
 126   <span class="keyword">void</span> <span class="identifier">start_accept</span><span class="special">()</span>
 127   <span class="special">{</span>
 128     <span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">pointer</span> <span class="identifier">new_connection</span> <span class="special">=</span>
 129       <span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">create</span><span class="special">(</span><span class="identifier">acceptor_</span><span class="special">.</span><span class="identifier">get_io_service</span><span class="special">());</span>
 130
 131     <span class="identifier">acceptor_</span><span class="special">.</span><span class="identifier">async_accept</span><span class="special">(</span><span class="identifier">new_connection</span><span class="special">-&gt;</span><span class="identifier">socket</span><span class="special">(),</span>
 132         <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">tcp_server</span><span class="special">::</span><span class="identifier">handle_accept</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">new_connection</span><span class="special">,</span>
 133           <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">));</span>
 134   <span class="special">}</span>
 135
 136   <span class="keyword">void</span> <span class="identifier">handle_accept</span><span class="special">(</span><span class="identifier">tcp_connection</span><span class="special">::</span><span class="identifier">pointer</span> <span class="identifier">new_connection</span><span class="special">,</span>
 137       <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">)</span>
 138   <span class="special">{</span>
 139     <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span><span class="special">)</span>
 140     <span class="special">{</span>
 141       <span class="identifier">new_connection</span><span class="special">-&gt;</span><span class="identifier">start</span><span class="special">();</span>
 142     <span class="special">}</span>
 143
 144     <span class="identifier">start_accept</span><span class="special">();</span>
 145   <span class="special">}</span>
 146
 147   <span class="identifier">tcp</span><span class="special">::</span><span class="identifier">acceptor</span> <span class="identifier">acceptor_</span><span class="special">;</span>
 148 <span class="special">};</span>
 149 </pre>
 150 <h5>
 151 <a name="boost_asio.tutorial.tutdaytime7.h2"></a>
 152         <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
 153         class</a>
 154       </h5>
 155 <p>
 156         Similarly, this next class is taken from the <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">previous
 157         tutorial step</a> .
 158       </p>
 159 <pre class="programlisting"><span class="keyword">class</span> <span class="identifier">udp_server</span>
 160 <span class="special">{</span>
 161 <span class="keyword">public</span><span class="special">:</span>
 162   <span class="identifier">udp_server</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">io_service</span><span class="special">&amp;</span> <span class="identifier">io_service</span><span class="special">)</span>
 163     <span class="special">:</span> <span class="identifier">socket_</span><span class="special">(</span><span class="identifier">io_service</span><span class="special">,</span> <span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span><span class="special">(</span><span class="identifier">udp</span><span class="special">::</span><span class="identifier">v4</span><span class="special">(),</span> <span class="number">13</span><span class="special">))</span>
 164   <span class="special">{</span>
 165     <span class="identifier">start_receive</span><span class="special">();</span>
 166   <span class="special">}</span>
 167
 168 <span class="keyword">private</span><span class="special">:</span>
 169   <span class="keyword">void</span> <span class="identifier">start_receive</span><span class="special">()</span>
 170   <span class="special">{</span>
 171     <span class="identifier">socket_</span><span class="special">.</span><span class="identifier">async_receive_from</span><span class="special">(</span>
 172         <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(</span><span class="identifier">recv_buffer_</span><span class="special">),</span> <span class="identifier">remote_endpoint_</span><span class="special">,</span>
 173         <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">udp_server</span><span class="special">::</span><span class="identifier">handle_receive</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span>
 174           <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">placeholders</span><span class="special">::</span><span class="identifier">error</span><span class="special">));</span>
 175   <span class="special">}</span>
 176
 177   <span class="keyword">void</span> <span class="identifier">handle_receive</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">system</span><span class="special">::</span><span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">error</span><span class="special">)</span>
 178   <span class="special">{</span>
 179     <span class="keyword">if</span> <span class="special">(!</span><span class="identifier">error</span> <span class="special">||</span> <span class="identifier">error</span> <span class="special">==</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">message_size</span><span class="special">)</span>
 180     <span class="special">{</span>
 181       <span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;</span> <span class="identifier">message</span><span class="special">(</span>
 182           <span class="keyword">new</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="identifier">make_daytime_string</span><span class="special">()));</span>
 183
 184       <span class="identifier">socket_</span><span class="special">.</span><span class="identifier">async_send_to</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">asio</span><span class="special">::</span><span class="identifier">buffer</span><span class="special">(*</span><span class="identifier">message</span><span class="special">),</span> <span class="identifier">remote_endpoint_</span><span class="special">,</span>
 185           <span class="identifier">boost</span><span class="special">::</span><span class="identifier">bind</span><span class="special">(&amp;</span><span class="identifier">udp_server</span><span class="special">::</span><span class="identifier">handle_send</span><span class="special">,</span> <span class="keyword">this</span><span class="special">,</span> <span class="identifier">message</span><span class="special">));</span>
 186
 187       <span class="identifier">start_receive</span><span class="special">();</span>
 188     <span class="special">}</span>
 189   <span class="special">}</span>
 190
 191   <span class="keyword">void</span> <span class="identifier">handle_send</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">shared_ptr</span><span class="special">&lt;</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">&gt;</span> <span class="comment">/*message*/</span><span class="special">)</span>
 192   <span class="special">{</span>
 193   <span class="special">}</span>
 194
 195   <span class="identifier">udp</span><span class="special">::</span><span class="identifier">socket</span> <span class="identifier">socket_</span><span class="special">;</span>
 196   <span class="identifier">udp</span><span class="special">::</span><span class="identifier">endpoint</span> <span class="identifier">remote_endpoint_</span><span class="special">;</span>
 197   <span class="identifier">boost</span><span class="special">::</span><span class="identifier">array</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="number">1</span><span class="special">&gt;</span> <span class="identifier">recv_buffer_</span><span class="special">;</span>
 198 <span class="special">};</span>
 199 </pre>
 200 <p>
 201         See the <a class="link" href="tutdaytime7/src.html" title="Source listing for Daytime.7">full source listing</a>
 202       </p>
 203 <p>
 204         Return to the <a class="link" href="../tutorial.html" title="Tutorial">tutorial index</a>
 205       </p>
 206 <p>
 207         Previous: <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">Daytime.6 - An
 208         asynchronous UDP daytime server</a>
 209       </p>
 210 </div>
 211 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 212 <td align="left"></td>
 213 <td align="right"><div class="copyright-footer">Copyright &#169; 2003-2017 Christopher M. Kohlhoff<p>
 214         Distributed under the Boost Software License, Version 1.0. (See accompanying
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