An ORB (Object Request Broker) is a form of middleware that allows objects written in different languages to communicate with each other. CORBA specifies a standard implementation of an ORB so that objects written to work with one ORB can communicate to objects using another ORB. IIOP is the protocol that runs over TCP/IP and allows ORBs to communicate.

Using RMI is very similar to using an ORB. But, RMI only works between objects that are written in Java. Using CORBA, objects written in Java can call methods of objects written in C++, C, Smalltalk, etc.

Objectives

Coverage of this topic focuses on how to use CORBA and Java together. Using the JavaIDL ORB provided by Sun, we will examine:

• The structure of an ORB.
  • Become familiar with the "CORBAServices".
  • Become familiar with the API of an ORB.
• Learn the basics of IDL.
  • Create IDL for your Java objects.
• Invoke a remote method of an object in a remote ORB.
  • Look up the object using the NamingService.
  • Use a "stringified" object reference.
  • Pass objects to a remote method.
  • Implement a call back to the object that is making the call from the object that is receiving the call

Specifications

• Duration (total): .5 day (3-4 hours)
• Duration of Exercises: 1.5 - 2 hours
• Duration of Lecture: 1.5 - 2 hours

Pre-requisites

If you are building a custom course, you will need to cover these topics before this topic can be presented:

• A helpful, but not manditory, topic to cover before CORBA is the module on RMI

• Basic Java knowledge including exception handling, threads, full use of all the language constructs, and familiarity with the core Java 1.1 APIs.
• Those without these pre-requisites should consider one of our Ultimate Java Programming Workshops.

A table of contents of this module is available upon request.

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