Introduction to Pattern Oriented Analysis and Design (POAD) Instructor: Dr. Hany H. Ammar Dept. of Computer Science and Electrical Engineering, WVU

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1 Itroductio to Patter Orieted Aalysis ad Desig (POAD) Istructor: Dr. Hay H. Ammar Dept. of Computer Sciece ad Electrical Egieerig, WVU

2 Outlie Review of Desig Patters The Lifecycle of a Patter Examples of Desig Patters The Commad Patter The Observer Patter The Strategy Patter Patter Orieted Developmet The Aalysis phase The Desig phase The desig refiemet phase The Feedback Cotrol Example

3 The Lifecycle of Patters (From the Referece Patter-Orieted Aalysis ad Desig, Sherif M Yacoub ad Hay H. Ammar Addiso-Wesley Ic., 2004) Leged Activit y Produc t Discover Patters Real World Projects Icidet Occurrece of a Patter Patter Miig Phase I: MINING Author World Modificatio Documet Author Versio Documet Aalyze/Rule of Three Prelimiary Documetati o Feedback Patter Polishig Reusable Versio Phase II: POLISHING Patter Commuity World Patter Reuse Phase III: REUSE Patter User World

4 Review of Desig Patters Examples of Desig Patters (From the Desig Patters CD by Gamma et al, Addiso-Wesley Ic., 1998 ) The Commad Patter: Ecapsulate a request as a object

5 Review of Desig Patters The Commad Patter From the Desig Patters CD by Gamma et al, Addiso-Wesley Ic., 1998

6 Review of Desig Patters Examples of Desig Patters The Observer Patter: whe oe object chages state, all its depedets are otified ad updated automatically Model View Cotroller example

7 Review of Desig Patters Examples of Desig Patters The Observer Patter class diagram From the Desig Patters CD by Gamma et al, Addiso-Wesley Ic., 1998

8 Review of Desig Patters Examples of Desig Patters The Strategy Patter: lets the algorithm vary idepedetly from cliets that use it

9 Patter Orieted Developmet Desig Patters are used i a ad-hoc strategy for desig refiemet They are also used to address a set of desig problems without ay guidace of how these patters ca be glued or iterface together Is there a way to use desig patters as buildig blocks or as compoets i the desig of systems?

10 Patter Orieted Developmet Patter Orieted Aalysis ad Desig (POAD) The process aspects of POAD explais the phases ad steps to develop a applicatio desig usig patters the POAD process has three phases: Aalysis Desig Desig Refiemet

11 Patter Orieted Developmet Aalysis Desig a logical model is developed ad patters are selected where patters are glued together to produce a detailed patter-level diagram Desig Refiemet A iitial class diagram, ad a more dese ad profoud class diagram, ad sequece diagrams are developed

12 The POAD process a) overall phases, b) aalysis, c) desig, ad d) desig refiemet (a) Overall POAD Aalysis Patter Library Acquaita ce Retrieval Applicatio Requiremets Requirem et Aalysis Required Coceptual Compoets Selectio Desig Cadidate Patters Selected Patters Desig Refiemet (b) Aalysis Selected Patters Create Patter Istaces (d) Desig Refiemet Detailed Patter- Level Diagrams Istatiatig Patter Iterals Domai Specific Detailed Patter-Level Diagrams Develop Class Diagrams Iitial UML class diagram Cocretizatio Specializatio Costructig Patter-Level models Patter-Level Diagrams Costructig models for Patter-Level with Iterfaces Patter-Level with Iterfaces Diagrams Costructig models for Detailed Patter-Level Defie Patter Relatioships Costruct Patter-Level Diagrams Declare Patter Iterfaces Idetify Relatioships betwee Patter Iterfaces Desig Optimizatio Reductio Mergig & Groupig Detailed Patter- Level Diagrams (c) Desig Optimized class diagram

13 POAD Aalysis Phase Develop use case diagrams to idetify the problems to be solved ad the possible breakdow of the applicatio as a set of logical compoets. Acquaitace with relevat patter databases to get the aalyst familiar with existig solutios. Retrieval of patters from the domai specific databases to select a set of cadidate patters i a automated fashio. Selectio of patters from a set of cadidate patters for possible iclusio i the desig process.

14 Costruct Patter-Level Models Create a istace for each selected patter by describig the patters ad their costituets i a applicatio specific cotext Defie how these istaces are related to each other The sematic of a depedecy relatioship used betwee patters has a "uses" meaig

15 The Feedback Cotrol Example From Patter-Orieted Aalysis ad Desig, Sherif M Yacoub ad Hay H. Ammar Addiso-Wesley Ic., 2004 Block diagram for a feedback cotrol system Referece Iput Error (Actuatig) Sigal + Feed forward Elemets Cotrolled Output + Plat. Feedback Data Feedback Elemets Measuremet

16 The Feedback Cotrol Example POAD Aalysis Phase (Patter Selectio) The feedforward compoet implemets some sort of a cotrol strategy (istace of Strategy patter) The feedback compoet receives measuremets ad applies a feedback cotrol strategy I the error calculatio compoet, the feedback cotroller otifies the error calculatio uit with the feedback data (istaces of the Observer patter) Data of differet types eed to be exchaged betwee the framework compoets (Measuremet, Feedback Data, iput data, ad error data )

17 The Feedback Cotrol Example Patter-Level diagram for feedback cotrol system This is a architectural patter based o the data flow architectural style Plat <<Strategy>> FeedforwardStrategy <<Observer>> FeedbackObserver Apply forward cotrol strategy Apply feedback cotrol strategy <<Observer>> ErrorObserver Calculate Error <<Strategy>> FeedbackStrategy Maipluate Data Maipluate Data Maipulate Data <<Blackboard>> Blackboard

18 The Feedback Cotrol Example Patter-Level with Iterfaces Cotext <<Strategy>> FeedforwardStrategy Notify <<Observer>> FeedbackObserver Update <<Observer>> ErrorObserver Update Notify Cotext <<Strategy>> FeedbackStrategy setdata <<Blackboard>> Blackboard getdata

19 The Feedback Cotrol Example Detailed Patter-Level diagram <<Strategy>> FeedforwardStrategy <<Observer>> FeedbackObserver Cotext CotextIterface() Strategy Observer Update() Subject Attach() Detach() Notify() Cotext CocreteStrate gya CocreteStrate gyb CocreteOb server observerstate Update() CocreteS ubject subjectstate getstate() Notify Observer Update() <<Observer>> ErrorObserver Subject Attach() Detach() Notify() Update <<Strategy>> FeedbackStrategy Cotext Strategy Update Notify Cotext CotextIterface() CocreteObserver CocreteSubject observerstate subjectstate Update() getstate() CocreteStrategyA CocreteStrategyB setdata getdata <<Blackboard>> Blackboard Blackboard setdata() getdata() DataHolder CocreteDataHolderA CocreteDataHolderB

20 The Feedback Cotrol Example Istatiatig the ErrorObserver patter <<Observer>> ErrorObserver AbstractObserver Update() AbstractSubject Attach() Detach() Notify() Update Notify ErrorObserver observerstate Update() FeedbackSu bject subjectstate GetState()

21 The Feedback Cotrol Example Istatiatig the FeedforwardStrategy patter <<Strategy>> FeedforwardStrategy Cotroll er CotextIterface() AbstractCotroll er Algori thmiterface() Cotroller CocreteStrategyA CocreteStrategyB Algori thmiterface() Algori thmiterface()

22 The Feedback Cotrol Example Istatiatig the Blackboard patter <<Blackboard>> Blackboard setdata Blackboard setdata() getdata() DataHolder getdata ErrorData MeasuredData FeedbackData

23 The Feedback Cotrol Example The iitial class diagram Cotroller AbstractCotroller AbstractObserver Update() AbstractSubject Attach() Detach() Notify() CotextIterface() CocreteStrategyA CocreteStrategyB FeedbackObserver observerstate Update() MeasuremetSubject subjectstate GetState() AbstractObserver Update() AbstractSubject Attach() Detach() Notify() Feedback CotextIterface() FBAbstractCotroller ErrorObserver observerstate Update() FeedbackSubject subjectstate GetState() FBCocreteStrategyA FBCocreteStrategyB Blackboard setdata() getdata() DataHolder ErrorData MeasuredData FeedbackData

24 The Feedback Cotrol Example The refied class diagram ready for code geeratio Cotroller AbstractCotroller CotextIterface() CocreteStrategyA CocreteStrategyB FBCocreteStrategyA FBCocreteStrategyB AbstractObserver Update() AbstractSubject Attach() Detach() Notify() FeedbackSubjectObserver ErrorObserver observerstate Update() MeasuremetSubject subjectstate GetState() Blackboard setdata() getdata() DataHolder ErrorData MeasuredData FeedbackData

25 The Feedback Cotrol Example Object Collaboratio Diagram F_cotroller : AbstractCotroller Strategy1 : CotrolStrategyA 15: Cotrol (DataHolder*) 1: Apply (DataHolder*) 13: Aalyze() 12: GetIput() FB_Strategy : FBCotrolStrategyA 2: Notify ( ) 9: Notify() 7: FBApply () 5: MeasurePlat ( ) Error : ErrorObserver 10: Update() Feedback : FeedbackSubjectObserver 3: Update ( ) Measuremet : MeasuremetSubject 11: Getstate() 8: Update () 4: GetState ( ) 14: Update () TheBlackboard: Blackboard 6: Update ()