Task: D3 - Investigate existing services
To find services that are already implemented in the organization and can be reused in the application under development.To keep track of the services, their contracts and associated software systems (implementation) are register in a central Services Catalogue of services.
Purpose
To find services that are already implemented in the organization and can be reused in the application under development.
Relationships
RolesPrimary: Additional: Assisting:
InputsMandatory: Optional:
  • None
External:
  • None
Outputs
Main Description

Existing services could be reused as if or it could be necessary to implement intermediary services for reusing other services that are not completely suited to the application, which is preferable than implement them again from scratch. To keep track of the services, their contracts and associated software systems (implementation) are register in a central Services Catalogue of services. In the SoaML component diagram an adapter or wrapper has to be defined to relate the design service to its existing implementation, which will then be linked in Activity D4. If the service can be used as it is, then the functionality of the adapter will be solely to call the existing component that implements the service; if it is similar then the adapter will add or modify the existing functionality to suite the new requirements for the service.

Example of wrapper definition taken from the SoaML standard:

 

Properties
Multiple Occurrences
Event Driven
Ongoing
Optional
PlannedYes
Repeatable
Key Considerations
An adapter or wrapped component is defined in the SoaML component diagram for the participant, to invoke the existing service, adding or modifying functionality if needed.