Gnizr Architecture (for developers)

Gnizr Architecture Dr. Harry Chen CMSC 491S/691S February 25, 2008

Agenda ,[object Object],[object Object],[object Object]

Design Patterns Found in Gnizr ,[object Object],[object Object],[object Object],[object Object],[object Object]

Gnizr Architecture What’s DAO?

What’s DAO? ,[object Object],User DB (MySQL) User Registration ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],How do you design your program to do these?

Why use DAO? ,[object Object],[object Object]

Tight-coupling is a bad idea Do you really want to write SQL every time you need to access the “customers” DB? Fetching data from “ResultSet” is complicated – it’s column-driven . Not natural for OO programming

DAO Design Pattern http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html

DAO Example User Registration User DB (MySQL) User (class) UserDAO ,[object Object],[object Object],[object Object],[object Object],[object Object]

Gnizr DAO package ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Gnizr DAO Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

How Gnizr Business Logic is Created When are these objects created? What’s the life span of these objects? How are JDBC connections initialized?

Inversion of Control (IoC) ,[object Object],[object Object],Problem : The use of “MovieFinderImpl” is hardwired into “MovieLister”. Change this logic will require code rewrite and re-compile “MovieFinderImpl” Read: http://martinfowler.com/articles/injection.html

Spring IoC ,[object Object],Spring IoC implements a flexible “Assembler”. Developers can tell this “Assembler” how to perform “<create>” via XML configuration. http://static.springframework.org/spring/docs/2.0.x/reference/beans.html

IoC in Gnizr ,[object Object],[object Object],[object Object],[object Object],[object Object]

Design Pattern: Singleton ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WebWork Actions are not Singletons ,[object Object],[object Object]

Actions are not Singleton ,[object Object],user session action DAO MySQL Singleton is okay under what condition?

WebWork Actions in gnizr ,[object Object],[object Object]

WebWork Interceptors ,[object Object],[object Object],[object Object],[object Object],[object Object]

Interceptor http://java.sun.com/blueprints/corej2eepatterns/Patterns/InterceptingFilter.html

Gnizr WebWork configuration ,[object Object],[object Object]

WebWork Result Types ,[object Object]

Which Result Type to Choose ,[object Object],[object Object]

Gnizr Result Type Examples ,[object Object],[object Object],[object Object],[object Object],[object Object]

Gnizr Architecture (for developers)

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