Hi Azeem,
The components of ESA could depend on the kind of solution you are trying to implement. However, if your question is regarding the tools that SAP provides to accomplish the ESA paradigm then they are the following:
1) Enterprise Services Repository (ESR): In a typical SOA scenario, this is where you would define your Service Interfaces. A corresponding WSDL file will be generated accordingly. At this point there is no backend implementation for your Interface.
2) Backend implementation: This Service interface in ESR can then be implemented in the backend system. Once implemented, SAP systems provide the option of directly publishing this implementation to a Services Registry.
3) Services Registry: This is a part of the NW Composition Environment and registers all web services published onto it. It is used as a single source for services for an organisation and has capabilities to configure governance processes for these services based on their classifications.
4) Composition Environment: This contains the tools one would need to consume the services from the Services Registry and create composite applications. It provides tools like WebDynpro, Guided Procedures, Visual Composer, CAF etc to accomplish the same.
Hope this helps.
Regards,
Romit
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