Service-Oriented Integration is based on creating a catalogue of SOA Services that expose
existing capabilities from back-end systems. Which statement best describes how an SOA Service
relates to the existing back-end systems?
A.
Each SOA Service exposes the functionality from only a single back-end system to ensure the
decoupling of SOA Services.
B.
An SOA Service should expose the low-level interface of the back-end system to ensure that all
back-end system capabilities are fully exposed.
C.
An SOA Service should expose higher-level business capabilities by encapsulating the lower
level Interfaces of the back-end systems.
D.
Each SOA Service should expose only one isolated capability of the back-end systems to
ensure isolation between SOA Service calls in composite applications.
E.
All access to a back end system should be through a single SOA Service to ensure the backend system will net become overloaded by service requests.
F.
An SOA Service should connect to at least two back-end systems; otherwise the SOA Service
is just duplicating the existing interface to the back-end system.
Explanation:
The primary purpose of the Business layer in the architecture is to define and
automate the
business processes external to, and independent of, the specific backend systems used
in the organization. This isolates the business process from backend system changes,and conversely, isolates the backend systems from business process changes.
De-coupling the business processes from the backend systems simplifies changes and
maintenance for business processes and backend systems.
The Business layer generally provides the greatest and most measurable business value.
Reference: Oracle Reference Architecture, Service-Oriented Integration, Release 3.0