Service Oriented Integration (SOI) exposes capabilities from existing source systems. Which
statement best describes the Impact SOI has on existing source systems?
A.
Because SOI exposes only existing capabilities, any new required functionality will be
implemented by modifying the existing source systems.
B.
No modifications to existing source systems are allowed because SOA Services expose all the
necessary capabilities from the source systems.
C.
Modifications to existing source systems should be avoided, but may be necessary to support
SOA Service creation.
D.
To support SOA Service connectivity, modifications will be required for the existing source
systems incorporated into the SOI architecture.
Explanation:
Some minor modifications may be required to support connectivity, but requiring
extensive modifications defeats a major reason for integration.It must be noted that creating a SOA Service from existing assets generally requires a
good deal more than just adding a standards-based interface, i.e. simply service
enabling existing assets is insufficient. The SOA Service needs to expose process,
functionality, and data that is usable in a broader context than the source of the capability was
designed to meet. Therefore, creating a SOA Service usually entails
some amount of aggregation, transformation, or expansion of existing capabilities
provided by the source systems. This requires a SOA Services layer between the
existing assets and the consumers as illustrated in the figure.Note: The primary goal of service-oriented integration is to better leverage existing systems
within the IT environment by applying service-oriented principles. Ultimately, the
goal is to enable the assembly of composite applications, with little or no custom
coding, that include capabilities sourced from existing systems.
Composite applications are applications that pull together data, functionality, and process from
multiple existing sources to solve a business problem or create new business value.
Service-oriented integration is the mechanism to expose existing sources of data,
functionality, and process so that those sources can be readily consumed by a
composite application.
Service construction includes creating entirely new SOA Services and also exposing
existing assets as SOA Services.
Reference: Oracle Reference Architecture, Service-Oriented Integration, Release 3.0
