But this was not the only promise of
the conceptual service hierarchical formation. Also shown was the need to identify reusability
264 Ch. 13 Service-Oriented Logical Design Composition
Insurance
Services
Hub
Service
Cluster Insurance
Consumer
Home
Insurance
Application
Processor
Atomic
Service
Home
Insurance
Underwriting
Composite
Service
Home
Insurance
Policy Issuer
Atomic
Service
Car Insurance
Application
Processor Atomic
Service
Driving Records
Verification
Atomic Service
Car
Insurance
Policy Issuer
Atomic
Service
EXHIBIT 13.8 CIRCULAR DESIGN COMPOSITION STYLE
opportunities early in the game and assess service granularity levels before they mature. Finally,
the advice was to tackle the consumption aspect of services even before they are ferried out to
production. These analysis efforts are typically facilitated by the layered structure of the service
hierarchical association.
In the service-oriented design phase, the hierarchical design composition style is used
because it is founded on these important conceptual promises. But now, the aim is to look at a different
logical design where services are arranged in hierarchical groups to provide a more tangible
design solution. Consider the following benefits of the hierarchical design composition style.
Vertical Design Approach. Look at Exhibit 13.9 now to understand what is meant by a hierarchical
design composition style.
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