COMP9321 Web Application Engineering Design Patterns 1 1 COMP9321, 16s1, Week 6 http://webapps.cse.unsw.edu.au/webcms2/course/index.php?cid=2442 Dr. Basem Suleiman Service Oriented Computing Group, CSE, UNSW Australia Semester 1, 2016, Week 6
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COMP9321 Web Application Engineering
Design Patterns 1
1 COMP9321, 16s1, Week 6
http://webapps.cse.unsw.edu.au/webcms2/course/index.php?cid=2442
Dr. Basem Suleiman
Service Oriented Computing Group, CSE, UNSW Australia
Semester 1, 2016, Week 6
Design Patterns
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A pattern is a proven solution to a problem in a context.
Design Patterns
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A pattern is a proven solution to a problem in a context.
Each pattern expresses a relation between a certain context, a problem, and a solution.
Design Patterns
4 COMP9321, 16s1, Week 6
A pattern is a proven solution to a problem in a context.
Each pattern expresses a relation between a certain context, a problem, and a solution.
A design pattern represents a solutions to problems that arise when developing a software.
Design Patterns
5 COMP9321, 16s1, Week 6
A pattern is a proven solution to a problem in a context.
Each pattern expresses a relation between a certain context, a problem, and a solution.
A design pattern represents a solutions to problems that arise when developing a software.
Design pattern are granular and applied at different levels such as: Frameworks Subsystems Sub-subsystems
Design Patterns
6 COMP9321, 16s1, Week 6
A pattern is a proven solution to a problem in a context.
Each pattern expresses a relation between a certain context, a problem, and a solution.
A design pattern represents a solutions to problems that arise when developing a software.
Design pattern are granular and applied at different levels such as: Frameworks Subsystems Sub-subsystems
Categories include:
Design
Architectural
Analysis
Creational
Structural
Behavioral
Design Patterns
7 COMP9321, 16s1, Week 6
A pattern is a proven solution to a problem in a context.
Each pattern expresses a relation between a certain context, a problem, and a solution.
A design pattern represents a solutions to problems that arise when developing a software.
Design pattern are granular and applied at different levels such as: Frameworks Subsystems Sub-subsystems
Categories include:
Design
Architectural
Analysis
Creational
Structural
Behavioral
MVC: Model View Controller e.g.
Design Patterns
8 COMP9321, 16s1, Week 6
A pattern is a proven solution to a problem in a context.
Each pattern expresses a relation between a certain context, a problem, and a solution.
A design pattern represents a solutions to problems that arise when developing a software.
Design pattern are granular and applied at different levels such as: Frameworks Subsystems Sub-subsystems
Categories include:
Design
Architectural
Analysis
Creational
Structural
Behavioral
Gamma et al (Gang of Four) produced a famous
book which listed 23 “Design” patterns
J2EE Design Patterns
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J2EE Design Patterns
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Web Application Architecture
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Web Application Architecture
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Web Application Architecture
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Web Application Architecture
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Web Application Architecture
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Web Application Layers
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J2EE design guidelines: Web tier
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J2EE design guidelines: Web tier
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Servlet Design Guidelines
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Servlet design guidelines: When to use Servlets
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Servlet design guidelines: When to use Servlets
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JSP Design Guidelines
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JSP Design Guidelines
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JSP Design Guidelines
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JSP Design Guidelines
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JSP Design Guidelines
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JSP Design Guidelines
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JSP Design Guidelines
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JSP Design Guidelines
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General Guideline for Servlet/JSP/JavaBeans
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General Guideline for Servlet/JSP/JavaBeans
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General Guideline for Servlet/JSP/JavaBeans
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Structuring Web applications
Architectural Patterns
(MVC)
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Structuring Web applications
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Structuring Web applications
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Structuring Web applications
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Model 1 Example
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Model 1 Example
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Model 1 Example
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Model 1 Example
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Model 1 Example
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Model 1 Example
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Model 1 Architecture
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MVC
Model View Controller
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Model 2 Architecture = MVC pattern
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Model 2 Architecture = MVC pattern
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MVC Components and Roles
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MVC can be broken down into three elements:
Model - The model represents data and the
rules that govern access to and updates of this
data.
View - The view renders the contents of a
model. It specifies exactly how the model data
should be presented.
Controller - The controller translates the user's
interactions with the view into actions that the
model will perform.
http://www.oracle.com/technetwork/articles/javase/index-142890.html
MVC Components and Roles
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http://www.oracle.com/technetwork/articles/javase/index-142890.html
Model 2 Architecture = MVC pattern
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Model 2 Architecture = MVC pattern
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Model 2 Architecture = MVC pattern
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Model 2 Architecture = MVC pattern
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Case for a centralised controller
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Case for a centralised controller
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Case for multiple controllers
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FrontController Pattern
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FrontController Pattern
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• The Front Controller pattern is a software design pattern.
• The pattern relates to the design of web applications.
• It provides a centralized entry point for handling requests.
• Front controllers are often used in web applications to
implement workflows.
• The front controller may be implemented as a Java object.
FrontController Pattern
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• The Front Controller pattern is a software design pattern.
• The pattern relates to the design of web applications.
• It provides a centralized entry point for handling requests.
• Front controllers are often used in web applications to
implement workflows.
• The front controller may be implemented as a Java object.
FrontController implementation: Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Command Design Pattern
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Identifying the Command Pattern in the phonebook lab
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Implementing the Command Pattern
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Typical "Assignment 2" Architecture
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Last Week – DAO, JDBC and Hibernate
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Hibernate Example
• Hibernate sessions (also JDBC connections)
• Data objects and database mappings
• Components mapping
• Inheritance, Associations, collection mapping, parent/child type
relationships
• Data source and Java Naming and Directory Interface (JNDI)
References
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• Core J2EE patterns, Deepak Alur, John Crupi and Dan Marlks, Prentice
Hall
• Patterns of Enterprise Application Architecture, Martin Fowler, Addison-
Wesley
• http://java.sun.com/blueprints/patterns/
• http://www.oracle.com/technetwork/articles/javase/index-
142890.html
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