Transcript Web Development

A Well Designed Web
Application
The Benefits of Object Oriented Analysis and
Design
Simone Becker
[email protected]
Agenda
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Sierra and RUP
Benefits of UML
Case Study
Reference Material / Questions
Sierra and RUP
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Sierra as a company has embraced RUP
RUP provides a methodology for software
development, from project management to
implementation
Even before RUP, we have utilized UML to describe the
web applications we were building
Benefits
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UML allows you to organize and model the system you
are going to build in an object oriented manner
UML is very visual
Case Tool independent
You use only that which will add value to your design
Case Study
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Department of Retirement Systems (DRS)
Electronic Services Application (eServices)
Case Study…Business
Requirements
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Requirements of proposed system are described using
use cases
Use cases capture the user’s expectations of the
functionality of the system
– describes the observable behavior of the system at
the points of interaction with users
– identify which actors/roles carry out the use case
– written in plain English so that they can be
understood by anyone reading them
Case Study…Anatomy of a Use
Case
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Title:
Actors:
Description:
Triggers and Frequency:
Preconditions:
Normal Process:
Exception Process:
Business Rules:
Post Conditions:
Performance considerations:
Case Study… Technical Design
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We structured the application in the typical tiers
– Graphical User Interface
– Business Logic Layer
– Data Layer
Case Study… Technical Design
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We identified the components and grouped them within
each tier
User Interface
ASP/HTML
Business Services
Component BSP
Data Services
omponent DSP
-clsRetrieve
-clsUpdate (transactional)
Case Study… Technical Design
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We identified the responsibilities of each component
Drew sequence diagrams to illustrate the interaction of the
components for each use case
Electronic
Services: Login
ASP
1. enter userid,
pswd
Electronic
Services: User
BSP
Electronic
Services: User
DSP
2. iValidateUser
3. get entered userid and pswd
4. rsGetUser
5. [if user 'inactive' or
'locked out'] return 1/3
6. case sensitive pswd
validation
7. ResetLogonCnt
ASP Request
Object
Case Study… Technical Design
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Deployment Diagram
Web Server
Client Browser
p
htt
st
ue
q
re
p
htt
e
ns
po
s
re
IIS
InetPub/wwwroot - ASP/HTML
Web
Grabber
COM+
Services
(BSP/DSP)
MQSeries
Mainframe
SQL
db
Case Study… Benefits to DRS
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An application designed on industry standards
The organization of the system is understandable at a
glance due to the visual modeling
Everyone on the team was speaking the same
“language”
– Business team
– Technical team
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The methodology and concepts are reusable to any
future projects
Reference Material:
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UML Distilled: A Brief Guide to the Standard Object Modeling
Language (2nd Edition)
– By Martin Fowler, Kendall Scott
Questions: