CSC308B Lecture 14

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

jgs Previously …

jgs Javier Gonzalez-Sanchez | CSC 308 | Winter 2024 |
3 Logger

4 Desktop

5 I/O

jgs Chain of Responsibility Avoid coupling the sender of a
request to its receiver by giving more than one object a chance to handle the request.

7 Chain of Responsibility

8 Chain of Responsibility // Setup Chain of Responsibility Handler h1 = new ConcreteHandler2(); Handler h2 = new ConcreteHandler2(); Handler h3 = new ConcreteHandler1(); h1.SetSuccessor(h2); h2.SetSuccessor(h3); // Generate and process request int[] requests = { 2, 5, 14, 22, 18, 3, 27, 20 }; foreach (int i=0; i<requests.lenght; i++) { h1.HandleRequest(request[i]); }

9 Handler abstract class Handler { public abstract void HandleRequest(int request); } class ConcreteHandler1 extends Handler { public override void HandleRequest(int request) { if (request >= 0 && request < 10) { // code here… } else { // nothing can be done :( } } }

10 Handler class ConcreteHandler2 extends Handler { protected Handler successor; public void setSuccessor(Handler successor) { this.successor = successor; } public override void HandleRequest(int request) { if (request >= 10 && request < 20) { // code here } else if (successor != null) { successor.HandleRequest(request); } } }

11 Chain of Responsibility vs Composite vs Decorator

jgs Fluent-Builder Wrapper of an object When an object cannot
be produced in one step

13 Fluent-Builder § The Fluent Builder is a builder whose design relies on method chaining. In doing so, it aims to promote code legibility.

14 Fluent-Builder import java.awt.*; public class Client { public static void main(String[] args) { FluentBuilder builder = new BoxFluentBuilder() .setColor(Color.RED) .setSize(20) .setX(10) .setY(20); Product box = ((BoxFluentBuilder)builder).get(); } }

15 Fluent-Builder import java.awt.Color; public interface FluentBuilder { public Builder setColor(Color color); public Builder setSize(int size); public Builder setX(int x); public Builder setY(int y); }

16 Fluent-Builder import java.awt.*; public class BoxFluentBuilder implements FluentBuilder { private Color color; private int size, x, y; public Builder setColor (Color color) { this.color = color; return this; } public Builder setSize(int size) { this.size = size; return this; } public Builder setX(int x) { this.x = x; return this; } public Builder setY(int y) { this.y = y; return this; } public Box get() { return new Box (color, size, x, y); } }

17 Example

18 GoF Patterns

jgs Test Yourselves

20 Assignment 03

21 Assignment 03

22 Assignment 03 - UI Main JFrame ActionListener PlotPanel JButton Run

23 Assignment 03 – Observer Pattern Main Observable PlotPanel Run Source Observer

24 Assignment 03 – Decorator Pattern Main PlotPanel Observer Worker WorkerStandard Tool ToolLine ToolSquare

25 Assignment 03 – Decorator Pattern ToolBar ToolSquare WorkerStandard ToolSquare WorkerStandar WorkerStandar

26 Assignment 03 – Singleton Pattern PlotPanel Run << Singleton >> Configurator

27 Source // This will became your Singleton

28 World (1/2)

29 World (2/2)

30 PlotPanel

31 WorkerStandard

32 WorkerTool

33 WorkerToolLine

34 ToolSquare

35 Questions

36 Questions

jgs CSC 308 Software Engineering 1 Lab 14: Plotter Dr.
Javier Gonzalez-Sanchez [email protected] www.javiergs.com Building 14 -227 Office Hours: By appointment

jgs Test Yourselves Team Coding

41 Team Work

42 Assignment 03

43 Let’s Work Can you Make it Work?

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.

CSC308B Lecture 14

CSC308B Lecture 14

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