5. Services and Properties
Do, or do not. There is no “try.”
—Yoda
Doing and Knowing
Streamlined object modeling boils object-oriented concepts down to the bare essentials necessary to fully model a complex domain: collaboration patterns, collaboration rules, and object services. Collaboration patterns simplify finding and representing objects, collaboration rules integrate business rules with objects, and object services carry out the work of business processes. This chapter deals with object services, including strategies for finding services, and strategies for distributing work among services. These strategies are expressed in terms of the collaboration patterns, so that the pattern players an object takes on in its collaborations significantly ...
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