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:
package Server is
pragma Remote_Call_Interface;
function Echo_String (S : String) return String;
end Server;
server.adb:
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:
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!"));
end Client;
For more details about the Distributed Systems Annex, see the Ada Reference Manual [ISO06].