Contemporary SOA promotes federation
Establishing SOA within an enterprise does not necessarily require that you replace what you already have. One of the most attractive aspects of this architecture is its ability to introduce unity across previously non-federated environments. While Web services enable federation, SOA promotes this cause by establishing and standardizing the ability to encapsulate legacy and non-legacy application logic and by exposing it via a common, open, and standardized communications framework (also supported by an extensiveadapter technology marketplace ).
Obviously, the incorporation of SOA with previous platforms can lead to a variety of hybrid solutions. However, the key aspect is that the communication channels achieved by this form of service-oriented integration are all uniform and standardized (Figure 3.9).
Figure 3.9. Services enable standardized federation of disparate legacy systems.
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