CORBA 2.3.7 Programmer's Guide for C++

Chapter 1. Introduction to NonStop CORBA Programming
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Chapter 1. Introduction to NonStop CORBA
Programming
Table of Contents
Before You Begin
Design Activities
Introduction to NonStop CORBA Components
NonStop CORBA 2.3 is based on the OMG standards for CORBA 2.3. This guide describes features
specific to the NonStop CORBA implementation as the features apply to designing and coding
applications. For information about CORBA standards or general CORBA programming information,
you should consult the OMG standards themselves or one of the many books available in the open
market.
A distributed object application using NonStop CORBA consists of three types of components:
Object classes●
Servers, each of which hosts one or more object classes●
Clients, which make use of objects in the servers●
The terms client and server refer to roles played by processes, but the same process can be both a client
and a server. When a process is invoking methods on an object, it is acting in the role of a client; when a
process receives method requests, it is acting in the role of a server.
The components of a hypothetical application could use NonStop CORBA and other CORBA
implementations. Local objects can be any kind of object class supported by the system; for example, a
proprietary C++ object class. CORBA objects are objects that comply with the CORBA standards and
are accessible to distributed clients. CORBA objects are conceptual, not real, objects unless they are
implemented in a programming language. CORBA objects use interoperable object references (IORs)
and the Internet Inter-ORB Protocol (IIOP) to provide location, platform, and language independence.
Before You Begin
To design an application or component, you must understand the following topics:
General principles of object-oriented design●
Object features such as inheritance, object-reference styles, and predefined classes and frameworks●
CORBA and related services●