Sept Ron McFadyen1 Today Sept 16: Chapters 1, 2, 3 Introductory material Next Tuesday Sept 21: Rational Rose and Use Cases Chapter 6 - Use Cases Followed by Chapters 9 and 25

Sept Ron McFadyen2 UML and patterns UML is a collection of techniques, a notation One case study throughout text NextGenPOS Text makes reference to the UP in order to set UML and the applications of patterns into a context UP is an iterative development methodology Iterative is very different from Waterfall Ch 1 OOA/D

Sept Ron McFadyen3 Ch 1 OOA/D OO analysis Emphasizes finding and describing the objects in the problem domain Example: playing a dice game One artifact is the Domain Model Player Die DiceGame plays rolls includes name faceValue

Sept Ron McFadyen4 Ch 1 OOA/D OO design Emphasizes defining software objects and how they collaborate to fulfill requirements To investigate and document the nature of how objects behave, we use interaction diagrams (and other techniques) die1:Die:DiceGamedie2:Die play() roll() getFaceValue()

Sept Ron McFadyen5 Ch 1 OOA/D OO design As we design, we assign responsibilities to classes and our domain model evolves to a design class diagram Player Die DiceGame plays rolls includes name faceValue play() roll() getFaceValue()

Sept Ron McFadyen6 Ch 1 OOA/D Unified Modeling Language (UML) Standard language for documenting OO systems Emerged due to efforts of Booch, Rumbaugh and Jacobson – the 3 amigos

Sept Ron McFadyen7 Ch 2 Iterative Development and the Unified Process (UP) Presented as an example process/methodology to give some structure/context to the presentation of the case study, UML, and patterns. Up is a from the Rational Corporation An iterative development process each iteration yields a working system iterations last anywhere from 2 weeks to 6 months many iterations make a project risk-driven early iterations prove out the major risks or show- stoppers

Sept Ron McFadyen8 Unified Process several activities deliverables are referred to as artifacts - works produced (use cases, code, database designs, …) Each iteration involves choosing some requirements and quickly designing, implementing and testing Relies on feedback. System converges towards the appropriate design 4 phases inception, elaboration, construction, transition Inception Use case model is started

Sept Ron McFadyen9 Figure 2.4 Illustrates the activities in UP used to develop a system Iterative development is central to the UP

Sept Ron McFadyen10 Figure 2.3 illustrates the 4 phases comprising the UP More requirements gatheringMore programming

Sept Ron McFadyen11 design analysis implementation testing maintenance Waterfall Development Process Linear one phase is completed before the next begins in practice, must revise earlier decisions based on experience in project - I.e. there is feedback Section 2.7

Sept Ron McFadyen12 design analysis implementation testing maintenance Waterfall Development Process Not iterative errors in earlier phases are really expensive to fix doesn’t allow for prototyping which is a strong aid for confirming requirements Section 2.7

Sept Ron McFadyen13 Ch 3 Case Study: the NextGen POS System Record sales Handle payments Retail store Interfaces to service applications Tax calc Inventory control Client – web browser Commercial application – sell to different clients

Sept Ron McFadyen14 NextGen POS Layered architecture

Sept Ron McFadyen15 Elaboratio n Iteration 1 Ch 9-20 Elaboratio n Iteration 1 Ch 9-20 Elaboratio n Iteration 2 Ch Elaboratio n Iteration 2 Ch Iteration 3 Elaboratio n Ch Iteration 3 Elaboratio n Ch Inception Ch 4-8 Inception Ch 4-8 The inception phase An initial step to investigate the prospective system, develop a vision, and make a decision to proceed or not We focus on the Use Case Model that is started in the Inception phase The elaboration phase Text uses 3 iterations to develop NextGenPOS Note that Java code is presented in Ch 20

Sept Ron McFadyen16 3C13 Lab can be used to work with Rational Rose Other tools you might use: Argo/UML, Poseidon, Visio, … Userid/password will be available Next week