In this section we will write a very simple client-server
application using PolyORB DSA. The server will provide a Remote
Call Interface
composed of a single Echo_String
function that
will take a String and return it to the caller.
Here is the code for the server:
server.ads:
------------------------------------------------------------------------------ -- -- -- 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) -- -- -- ------------------------------------------------------------------------------ package Server is pragma Remote_Call_Interface; function Echo_String (S : String) return String; end Server;
server.adb:
------------------------------------------------------------------------------ -- -- -- 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) -- -- -- ------------------------------------------------------------------------------ package body Server is function Echo_String (S : String) return String is begin return S; end Echo_String; end Server;
And here is the code for the client:
client.adb:
------------------------------------------------------------------------------ -- -- -- 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) -- -- -- ------------------------------------------------------------------------------ with Ada.Exceptions; with Ada.Text_IO; use Ada.Text_IO; with Server; procedure Client is begin Put_Line ("The client has started!"); Put ("Thus spake my server upon me:"); Put_Line (Server.Echo_String ("Hi!")); exception when E : others => Put_Line ("Got " & Ada.Exceptions.Exception_Information (E)); end Client;
For more details about the Distributed Systems Annex, see the Ada Reference Manual [ISO06].