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Traditionally, youwou ld develop a specific interface
between two systems. As youadded a third system to the mix, youwou ld have to
Figure 9-7. Oracle Streams/Advanced Queuing
Oracle
Advanced
Queues
Oracle
Advanced
Queues
Application
MACHINE
BOUNDARY
Propagate
Propagate
Application
Oracle
Advanced
Queues
Application
Application
220 | Chapter 9: Oracle and Transaction Processing
create more specific interfaces between each of the systems. The more systems you
attempt to integrate, the more custom interfaces you would be responsible for developing
and the greater the development and maintenance burden would be.
Using these components, individual systems can connect to a hub via the spokes,
thus avoiding direct system-to-system interfaces. The spokes send and receive messages,
while the hub provides routing and transformation services. This reduces the
number of interfaces required to connect a set of systems. You don??™t need a specific
interface for every specific system pair. Adding systems to existing systems doesn??™t
require development of many new interfaces.


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