SUNTONE ARCHITECTURE METHODOLOGY A 3-DIMENSIONAL ...

platforms have wrapped the “lower platform” thinly, without significantly raising the
level of abstraction. Today, virtual platforms are available that provide much more
comprehensive and high-level abstractions and directly support the model outlined in
this paper. The two leading virtual platforms for dot-com implementations are Java 2
Enterprise Edition (J2EE) and CORBA.
3-DIMENSIONAL EXAMPLE
Consider an extremely simplistic example in which a retail catalog firm wants to be
able to take orders over the Internet, initially via HTML forms from desktop browsers,
and from other device types in the future. A legacy order entry system is currently
used by their call center operators to enter customer orders received over the telephone,
and this system will be used as the back-end for a new web-based, customer
self-service system. A packaged solution is being considered as a replacement for the
legacy system. It has been determined that the best way to communicate with the
legacy system is via message queues.
The sample application platform architecture is depicted below.
Figure 6—Simple Order-Entry Example related to the 3DF
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Virtual
Upper
Lower
Hardware
HTML
Any Browser
Any OS
Any HW
CLIENT
JSP
iES
Solaris
E450
Order
Form
PRESENTATION
EJB
iAS
Solaris
E5500
Form
Handler
BUSINESS
JMS
MQ Series
Solaris
E250
Order
Service
INTEGRATION
Order
System
Interface
APPO
CICS
MVS
ES9000
RESOURCE
Legacy
Order
System
Parallelization
Queing
Clustering
Round Robin
Horizontal Scaling
Scaling Strategy
SunTone Architecture Methodology