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Why are businesses so interested in distributed objects? Roger demonstrates the importance of distributed objects as he introduces the basic concepts of OO programming (inheritance, encapsulation, and polymorphism). He shows how objects are distributed across networks and discusses some basic frameworks used to coordinate distributed objects. This is an introductory overview, designed for programmers who have no experience in OO programming.
This tutorial is designed for experienced OO programmers who want to learn how to do distributed OO programming ala CORBA. Roger will guide you through an examination of interface definitions in IDL, object implementations in languages with CORBA bindings, and the various CORBA services used to coordinate distributed objects. Although the medium is SOM 3.0, the focus is more general.
It's time to throw away your OO database! We will examine in detail the CORBA services related to Persistence. The Externalization Service allows objects to export their state; the Persistence Service allows that state to be stored into any compliant database; and the Transaction service allows persistence to be coordinated with the overall transactions in which objects participate. Together, these three services allow distributed CORBA objects to support a variety of styles of Object Persistence, and to be stored in formats ranging from optimized object dumps to formats compatible with existing legacy data.
Roger Sessions is president of ObjectWatch, Inc., an Austin, Texas consulting firm,
and he is widely regarded as the world's leading expert in SOM and DSOM. He writes
"The World of Objects" column for OS/2 Magazine and has written many articles and
three books, including the recently released Object Persistence: Beyond Object
Oriented Databases. He is the publisher of the
SOMobjects Home Page and the electronic newsletter
ObjectWatch on SOM. He can be reached via email at
roger@fc.net.