SOA

[Former Member]

what exactly is SOA,eSOA,and how is it related to XI.Can you give me an example where it is used and how to use it.

Thanks

[Former Member]

Hi,

SOA is more generic. Any system that provides web services (which are self-contained and self-describing) can be termes as SOA enabled. The provider of the service registers the service over UDDI in the form of WSDL. The consumer searches the UDDI for the desired service and invokes it. There can be multiple web services (from multiple providers) for the same application (eg. purchase order creation).

ESOA are simply Web services that provide enterprise-level business functionality.They may range from very simple lookup services (like finding a company’s location or product offerings) to more complex and composite services — but what they have in common is that they’re highly integrated into your process or application.Typically ESOA are high-level components that take more granular Web services and aggregate them into reusable elements with business value. For example, take the service Cancel Purchase Order. An elementary Web service like Delete Purchase Order would simply lead to the deletion of a purchase order in the corresponding database. However, if the stated goal is “cancel purchase order,” the service has to become a more far-reaching enterprise service that handles this process end-to-end, and therefore has to trigger a number of follow-up actions, including:

=> Check against production orders

=> Check against a corresponding billing process

=> Update of inventory/warehouse information Or consider the Credit Limit Check

service, which at first glance seems to be quite simple. Normally, this service is one ingredient of the Order Creation service. But typically, credit checking is

really a more elaborate composite service.

5 Key Principles of ESOA

1. Abstraction — hiding confusing details

2. Modularity — breaking down complexity, resulting in reusable pieces

3. Standardized connectivity — enabling flexible composition of services to

create bigger processes and scenarios

4. Loose coupling — allowing for separate evolution of the various components

without breaking any points of integration

5. Incremental design — enabling changes to composition and configuration

without affecting the interior of components, and vice versa

Regards,

Raj