Domain Tier Design
This chapter shows how to design interaction among objects (dynamic modeling) in order to implement system operation contracts using UML interaction diagrams (communication and sequence). Initially, object responsibility and visibility are explained in order to show that objects may only communicate to each other to perform their responsibilities if they have a visibility line to follow. Next, the chapter discusses how to build dynamic models in which objects change messages in order to perform the actions that are necessary to meet the postconditions of a contract, and how the preconditions and exceptions affect it. Design patterns for responsibility distribution among objects are presented in order to improve the ...
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