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Echo Example

Introduction

This is a simple CORBA example that has an object (Echo) with only two methods; one that returns the message to be displayed and another that shuts down the server.

Passing the Server IOR to Clients

To keep this example simple, the server advertises its IOR in the following manner; the server program writes its server object's IOR to an ior_file. Later on, the client reads this IOR from the specified ior_file and uses the 'string_to_object' method to obtain a reference to the server object.

For this mechanism to work, the file must be readable and writable. If it doesn't exist, a new file is created by the server. Moreover, the file path must be accessible to both the client and server.

If the client and server are on different machine, then there must be a shared directory accessible by both. On UNIX systems this is typically done via the NFS mount command. On Windows, the 'explorer' application provides an option to share drives.

In general if no such file sharing option is available, then using the the Naming Service mechanism is the only alternative, as described by the -n option below. There are other command line options available for the server and client which are also explained below.

Command Line Options

Server

server [-d] [-o <IOR_file_name>] [-n]

Options

Client

client [-d] [-x] [-f <IOR_file_name>] [-k IOR] [-n naming service]

Options