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<a name="A-small-example-of-a-DSA-application"></a>
<div class="header">
<p>
Next: <a href="Building-a-DSA-application-with-PolyORB.html#Building-a-DSA-application-with-PolyORB" accesskey="n" rel="next">Building a DSA application with PolyORB</a>, Previous: <a href="Most-Features-in-One-Example.html#Most-Features-in-One-Example" accesskey="p" rel="prev">Most Features in One Example</a>, Up: <a href="DSA.html#DSA" accesskey="u" rel="up">DSA</a> &nbsp; [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="A-small-example-of-a-DSA-application-1"></a>
<h3 class="section">8.4 A small example of a DSA application</h3>

<p>In this section we will write a very simple client-server
application using PolyORB DSA. The server will provide a <code>Remote
Call Interface</code> composed of a single <code>Echo_String</code> function that
will take a String and return it to the caller.
</p>
<p>Here is the code for the server:
</p>
<p><samp>server.ads</samp>:
</p><div class="smallexample">
<pre class="smallexample">
------------------------------------------------------------------------------
--                                                                          --
--                           POLYORB COMPONENTS                             --
--                                                                          --
--                               S E R V E R                                --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--         Copyright (C) 2011-2012, Free Software Foundation, Inc.          --
--                                                                          --
-- This is free software;  you can redistribute it  and/or modify it  under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  This software is distributed in the hope  that it will be useful, --
-- but WITHOUT ANY WARRANTY;  without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public --
-- License for  more details.                                               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- &lt;http://www.gnu.org/licenses/&gt;.                                          --
--                                                                          --
--                  PolyORB is maintained by AdaCore                        --
--                     (email: sales@adacore.com)                           --
--                                                                          --
------------------------------------------------------------------------------

<b>package</b> Server <b>is</b>
   <b>pragma</b> Remote_Call_Interface;
   <b>function</b> Echo_String (S : String) <b>return</b> String;
<b>end</b> Server;

</pre></div>

<p><samp>server.adb</samp>:
</p><div class="smallexample">
<pre class="smallexample">
------------------------------------------------------------------------------
--                                                                          --
--                           POLYORB COMPONENTS                             --
--                                                                          --
--                               S E R V E R                                --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--         Copyright (C) 2011-2012, Free Software Foundation, Inc.          --
--                                                                          --
-- This is free software;  you can redistribute it  and/or modify it  under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  This software is distributed in the hope  that it will be useful, --
-- but WITHOUT ANY WARRANTY;  without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public --
-- License for  more details.                                               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- &lt;http://www.gnu.org/licenses/&gt;.                                          --
--                                                                          --
--                  PolyORB is maintained by AdaCore                        --
--                     (email: sales@adacore.com)                           --
--                                                                          --
------------------------------------------------------------------------------

<b>package</b> <b>body</b> Server <b>is</b>

   <b>function</b> Echo_String (S : String) <b>return</b> String <b>is</b>
   <b>begin</b>
      <b>return</b> S;
   <b>end</b> Echo_String;

<b>end</b> Server;

</pre></div>

<p>And here is the code for the client:
</p>
<p><samp>client.adb</samp>:
</p><div class="smallexample">
<pre class="smallexample">
------------------------------------------------------------------------------
--                                                                          --
--                           POLYORB COMPONENTS                             --
--                                                                          --
--                               C L I E N T                                --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--         Copyright (C) 2011-2012, Free Software Foundation, Inc.          --
--                                                                          --
-- This is free software;  you can redistribute it  and/or modify it  under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  This software is distributed in the hope  that it will be useful, --
-- but WITHOUT ANY WARRANTY;  without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public --
-- License for  more details.                                               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- &lt;http://www.gnu.org/licenses/&gt;.                                          --
--                                                                          --
--                  PolyORB is maintained by AdaCore                        --
--                     (email: sales@adacore.com)                           --
--                                                                          --
------------------------------------------------------------------------------

<b>with</b> Ada.Exceptions;
<b>with</b> Ada.Text_IO; <b>use</b> Ada.Text_IO;
<b>with</b> Server;

<b>procedure</b> Client <b>is</b>
<b>begin</b>
   Put_Line (&quot;The client has started!&quot;);
   Put (&quot;Thus spake my server upon me:&quot;);
   Put_Line (Server.Echo_String (&quot;Hi!&quot;));
<b>exception</b>
   <b>when</b> E : <b>others</b> =&gt;
      Put_Line (&quot;Got &quot; &amp; Ada.Exceptions.Exception_Information (E));
<b>end</b> Client;

</pre></div>

<p>For more details about the Distributed Systems Annex,
see the Ada Reference Manual <cite>[ISO06]</cite>.
</p>
<hr>
<div class="header">
<p>
Next: <a href="Building-a-DSA-application-with-PolyORB.html#Building-a-DSA-application-with-PolyORB" accesskey="n" rel="next">Building a DSA application with PolyORB</a>, Previous: <a href="Most-Features-in-One-Example.html#Most-Features-in-One-Example" accesskey="p" rel="prev">Most Features in One Example</a>, Up: <a href="DSA.html#DSA" accesskey="u" rel="up">DSA</a> &nbsp; [<a href="About-This-Guide.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html#Index" title="Index" rel="index">Index</a>]</p>
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