B2B Integration : A Practical Guide to Collaborative E-commerce

234 B2B Integration — A Practical Guide to Collaborative E-commerce
provide the fundamental building blocks for creating distributed systems.
They can be developed and deployed independently of other system
components. Components are designed to be the ultimate plug-and-play
application development solution.
Components often go beyond basic object services by providing:
• High level transaction management;
• Security;
• Event-handling; and
• Persistence.
Object technology has now been relegated to the development
methodology used for implementing distributed component architecture.
Components are created and deployed using a protocol, such as
those specified for CORBA, COM or EJB (discussed in the next
section). COM and EJB are both based on component architecture,
while CORBA has recently addressed the need for components with its
CORBA Component Model (CCM) protocol.
8.4.2. Distributed object frameworks
Distributed object frameworks have come a long way from the original
object-oriented programming methodologies espoused by the academic
community. These new frameworks extend well beyond objects, with
each of these frameworks, including OMA, Windows DNA and J2EE,
offering a wide range of services. Some elements common to all the
frameworks include:
• A distributed enterprise level framework or specification (OMA,
J2EE, Windows DNA);
• A distributed object or component framework or specification
(CORBA, EJB, COM+);
• An interface definition language (IDL);
• Messaging and MOM;
• Transactional processing and management;
• Security;
• Persistence; and
• Event handling.