CSC308B Lecture 12 - Speaker Deck

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jgs CSC 308 Software Engineering 1 Lecture 12: Patterns II Dr. Javier Gonzalez-Sanchez [email protected] www.javiergs.com Building 14 -227

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jgs Previously …

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 3 Scenario Observer + update() Observable + addObserver() + notifyObservers() + setChanged() Teacher Student Main

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 4 Homework Reading

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 5 Important Depreciated java.util.Observer java.util.Observable The implementation of these packages That is NOT about the Observer pattern being depreciated.

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 6 Important Use java.beans.PropertyChangeListener java.beans.PropertyChangeSupport

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jgs Test Yourselves

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 8 NumberGenerator.java

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 9 Screen.java

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 10 Main.java

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 11 Let’s Work UML Diagram?

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jgs Singleton

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 13 GoF Patterns

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 14 Singleton

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 15 class MainApp { public static void Main(String []a){ // Constructor is protected -- cannot use new Singleton s1 = Singleton.getInstance(); Singleton s2 = Singleton.getInstance(); // Test for same instance if (s1 == s2){ // true - Objects are the same instance } } } Singleton

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 16 class Singleton{ private static Singleton _instance; // Constructor is 'protected' protected Singleton() {} public static Singleton getInstance(){ if (_instance == null){ _instance = new Singleton(); } return _instance; } } Singleton

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jgs Decorator & Composite Design Patterns

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 18 GoF Patterns

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 19 Decorator

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 20 Decorator

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 21 Decorator

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 22 abstract class Component { public abstract void operation(); } Component

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 23 class ConcreteComponent extends Component { @override public void operation() { System.out.print("ConcreteComponent-Operation()"); } } ConcreteComponent

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 24 abstract class Decorator extends Component { protected Component component; public void setComponent(Component component) { this.component = component; } @override public void operation() { if (component != null) { component.operation(); } } } Decorator

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 25 class ConcreteDecoratorA extends Decorator { @override public void operation() { super.operation(); System.out.println("ConcreteDecoratorA-Operation()”); } } ConcreteDecoratorA

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 26 class ConcreteDecoratorB extends Decorator { @override public void operation() { super.operation(); addedBehavior(); System.out.println("ConcreteDecoratorB-Operation()"); } void addedBehavior() { } } ConcreteDecoratorB

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 27 class MainApp { static void main() { // Create ConcreteComponent and two Decorators ConcreteComponent c = new ConcreteComponent(); ConcreteDecoratorA d1 = new ConcreteDecoratorA(); ConcreteDecoratorB d2 = new ConcreteDecoratorB(); // Link decorators d1.SetComponent(c); d2.SetComponent(d1); d2.Operation(); } } Main

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 28 class MainApp { static void main() { // Create ConcreteComponent and two Decorators ConcreteComponent c = new ConcreteComponent(); ConcreteDecoratorA d1 = new ConcreteDecoratorA(); ConcreteDecoratorB d2 = new ConcreteDecoratorB(); // Link decorators d1.SetComponent(c); d2.SetComponent(d1); d2.Operation(); } } Main ConcreteComponent - Operation() ConcreteDecoratorA - Operation() ConcreteDecoratorB - Operation()

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 29 Questions

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jgs CSC 308 Software Engineering 1 Lab 11: Project Sprint 2 (Continue) Dr. Javier Gonzalez-Sanchez [email protected] www.javiergs.com Building 14 -227 Office Hours: By appointment

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 33 Scenario (1) Repository is a Singleton It stores the information for Squares and circles objects (2) A CircleBuilder is a Runnable Creating circles 1 per second At random places (3) A BoxBuilder is a Runnable Creating boxes 1 per second At random places (4) A Screen is a Panel Drawing the circles and boxes observed in the Whiteboard (5) And we need a Main that assembly everything and provide a Frame

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jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 | 34 Let’s Work

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jgs CSC 308 Software Engineering I Javier Gonzalez-Sanchez, Ph.D. [email protected] Winter 2024 Copyright. These slides can only be used as study material for the class CSC 308 at Cal Poly. They cannot be distributed or used for another purpose.