The Service-Oriented
Analysis Process
|
|
Service-Oriented
Design Processes
|
|
|
|
The Service-Oriented Analysis Process
|
Service Modeling Process (Part II)
The iterative nature of the aforementioned inventory analysis allows for service
candidates to be repeatedly revised and refined prior to the creation of corresponding
services.
The service modeling steps displayed in the previous figure are explained in detail in "Service-Oriented Architecture: Concepts, Technology, and Design."
In a nutshell, a business process definition is decomposed
(Step 1) into its most detailed representation, resulting in a series of granular actions.
Those suitable for service encapsulation become potential service capability candidates
(Step 2).
The service logic of each capability candidate is assessed in terms of whether it is specific
or agnostic to the current business process. Agnostic capability candidates are
grouped into agnostic service candidates usually based on entity and utility service
models (Step 3), whereas non-agnostic capability candidates are placed into a task service
candidate with a functional scope usually equivalent to the business process (Step 4).
During subsequent iterations of this process, the chances of identifying already defined
capability candidates increase. Therefore, a separate discovery step (not shown) is
added to ensure that no redundant capability or service candidates are introduced into
the blueprint. Also select service-orientation principles are applied to shape modeled
service candidates in preparation for their eventual designs (Step 5).
The following three service-orientation principles are typically applied during the service
modeling process:
• Service Reusability
• Service Autonomy
• Service Discoverability
After the initial set of service candidates is established, a candidate composition is
assembled and subjected to possible runtime scenarios (Step 6). Subsequently, each of
the identified service capability candidates is further studied to explore any additional
processing requirements that may be needed to carry out its functionality. This kicks off
the second half of the service modeling process (Steps 7–12) during which additional
utility service capability candidates are generally defined. The process ends with an
extended composition candidate modeling step and a final revision of all capability and
service candidate definitions created so far.
|
|
