IBM Object Oriented Analysis and Design - Part 2 (Design)

captures the key aspects of a solution in a way that is implementation-independent ✘ specifies the exact implementation of the mechanism and is bound to a certain technology, implementationlanguage, or vendor ✘ is the same as a design pattern ✘ assumes some details of the implementation environment, but is not tied to a specific implementation ✔

Classes should not realize an interface. ✘ Each subsystem realizes only one interface. ✘ Interfaces should be identified before subsystems are created. ✘ Interfaces should be packaged separately from the elements that realize them. ✔

common subflows between objects on several sequence diagrams ✘ similar objects on several sequence diagrams ✘ a consistent series of state transitions for multiple classes involved in a use-case realization ✘ the same design classes involved in more than one use-case realization ✔

converting analysis classes into design classes and design subsystems ✘ describing persistence-related behavior ✘ describing object interactions that implement interface operations ✘ simplifying sequence diagrams using design classes ✔

an interface that the subsystem realizes ✘ a subsystem proxy ✘ a subsystem component ✘ a subsystem class ✔

classes and relationships ✘ objects and messages ✘ subsystems and dependencies ✘ nodes and connectors ✔

textual use-case descriptions ✘ communication diagrams ✘ state charts ✘ activity diagrams ✔

its internal class behavior ✘ the operations of the interfaces it implements ✘ the use-case realizations in which the subsystem appears ✘ the operations on a class contained within the subsystem ✔

Persistency ✘ ObjectStore Object-oriented Database ✘ Distribution ✘ Remote Method Invocation ✔

The subsystems responsibilities are allocated to its internal design elements. ✘ Each subsystem is checked to ensure it has a consistent set of responsibilities and inconsistentresponsibilities are reassigned to other subsystems. ✘ Libraries and external APIs are identified to realize the subsystem behavior. ✘ Distribution mechanisms are detailed for exposing subsystem interfaces. ✔