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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> [<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 --
-- <http://www.gnu.org/licenses/>. --
-- --
-- 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 --
-- <http://www.gnu.org/licenses/>. --
-- --
-- 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 --
-- <http://www.gnu.org/licenses/>. --
-- --
-- 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 ("The client has started!");
Put ("Thus spake my server upon me:");
Put_Line (Server.Echo_String ("Hi!"));
<b>exception</b>
<b>when</b> E : <b>others</b> =>
Put_Line ("Got " & 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> [<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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