SOI is also an abbreviation for Silicon-On-Insulator.
Service-oriented integration (SOI) is defined as integrating computing entities using only service interactions in a service-oriented architecture. Service-oriented integration addresses problems with integrating legacy and inflexible heterogeneous systems by enabling IT organizations to offer the functionality locked in existing applications as reusable services.
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In contrast to traditional enterprise application integration (EAI), the significant characteristics of services-oriented integration are:
Well-defined, standardized interfaces – Consumers are provided with easily-understood and consistent access to the underlying service.
Opaqueness – The technology and location of the application providing the functionality is hidden behind the service interface. In fact, there is no need for a fixed services provider.
Flexibility – Both the providers of services and consumers of services can change - the service description is the only constant. Provided both the provider and consumer continue to adhere to the service description, the applications will continue to work.