1. Alecsandar STOIANOV

2. Legacy software Introduction

3. Patterns & Antipatterns

4. Observer  observerPattern(Project, SubjectN, ObserverN, ConcrSubjsN,ConcrObserversN, UpdateMsN,AttDetMeths,NotifyMeth):- observer(Observer,ObserverN,Project), subject(Subject,SubjectN,Observer,AttDetMeths,Notif yMeth,UpdateMsN), findall(X,concreteSubject(_,X,Subject),ConcrSubjsN), findall(Y,concreteObserver(_,Y,Observer),ConcrObser versN).

5. God Class  This AntiPattern is characterized by a class diagram composed of a single complex controller class surrounded by simple data classes. The key problem here is that the majority of the responsibilities are allocated to a single class.

6. Results 1 SingletonDecoratorObserverStrategyAdapter MePinotMePinotMePinotMePinotMePinot jHotDraw 6.0b1 10455951 95 Java AWT 1.3 333349435493 Java Swing 1.4 1013154968110963017 Java.io 1.4.2 00340135304 Java.net 1.4.2 0001000400 Apache Ant 1.6.2 2134256453913

7. Results 2 Data ClassCall Super Constant Interface God Class Interface Bloat Yoyo Problem (factor = 6) Poltergeist jHotDraw 6.0b1 107201325418 Java AWT 1.323340232702 Java Swing 1.4 5522328648167 Java.io 1.4.213818100 Java.net 1.4.29012000 Apache Ant 1.6.2 338606327925

8. & Answers? Questions