c6mini Adina, R é ka, Marius 11 th of June, 2009

c6minic6miniAdina, RAdina, Rééka, Mariuska, Marius

1111thth of June, 2009 of June, 2009

Apr 22, 2023 1Patterns Of Enterprise

Application Architecture

Apr 22, 2023Patterns Of Enterprise

Application Architecture2

The ChallengeThe Challenge

Software application used by:Human Resources department: track information about company’s offices and employees

Sales department: track information about orders

Based on a given relational schema, develop a multi-layer architecture which:

to use a given combinations of patterns

to process a given set of business rules

to result in a multi-user application with simultaneous user actions

C6: Transform/Template View, Page Controller, C6: Transform/Template View, Page Controller, Domain Model, Data Mapper, Unit of Work, Domain Model, Data Mapper, Unit of Work, Identity MapIdentity Map



Project OverviewProject Overview

Main technology: Java WebProject Setup:



Communication protocol:• Skype conferences• Face-to-face meetings

Communication protocol:• Skype conferences• Face-to-face meetings

Development Environments &Tools:• Eclipse• ANT• Apache Tomcat• Source Control: SVN – Google Code Project Hosting

Development Environments &Tools:• Eclipse• ANT• Apache Tomcat• Source Control: SVN – Google Code Project Hosting

Software Analysis, Architecture & Design:• MS Visio

Software Analysis, Architecture & Design:• MS Visio

SVN RepositorySVN Repository



Application Application ArchitectureArchitecture



Presentation LayerPresentation Layer



Model – View – Controller architectural pattern:

• [Page Controller][Page Controller] Controller: • Requests controller: Struts

the Controller receives the request from the browser, and makes the decision where to send the request

• Dynamic behavior: Struts servlet and actions

• [Template View] [Template View] View:• Visual Styles: CSS• Layout: SiteMesh decorators• Presentation: JSP

Presentation Presentation PackagePackage



Domain LayerDomain Layer



• [Domain Model][Domain Model]• incorporates both behavior and

data (e.g class Employee)• Simple Domain Model:

similar to database design (domain object <–> DB table)

Business PackagesBusiness Packages



Persistence LayerPersistence Layer



Mapping to Mapping to Relational DatabaseRelational Database

• Architectural patterns: Architectural patterns: Data Data MapperMapper

• Behavioral Problems:• ensure that the DB state

remains consistent Unit of Unit of Work - Work - object registration: clean/dirty flags

• load each object once Identity Identity MapMap

Persistence PackagePersistence Package



General Business General Business RulesRules

RBG 1: Adaugare angajat nouRBG 2: Avansarea unui angajat pe un alt tip de jobRBG 3: Afisarea departamentelor cu numarul de angajati si salarul mediuRBG 4‘: Afisarea cu verde a angajatilor cu salarul cu cel putin XX% mai mare decat salarul mediuRBG 4‘‘: Afisarea cu rosu a angajatilor cu salarul cu cel putin YY% mai mic decat salarul mediu




RBG 1: Adaugare angajat nou




RBG 2: Avansarea unui angajat pe un alt tip de job




RBG 3: Afisarea departamentelor cu numarul de angajati si salarul mediu




RBG 4‘: Afisarea cu verde a angajatilor cu salarul cu cel putin XX% mai mare decat salarul mediuRBG 4‘‘: Afisarea cu rosu a angajatilor cu salarul cu cel putin YY% mai mic decat salarul mediu



Special Business Special Business RulesRules

RBS 1: Cresterea comisionului pentru angajatii care au avut un numar de comenzi mai mare YY in ultimele ZZ zile. RBS 2: Clientii din regiunea KK primesc o reducere cu GG% a pretului de lista, pretul final nefiind insa mai mic decat cel minim acceptat.RBS 3: Angajatii cu vechime in firma mai mare de ZZ ani primesc o crestere a salarului cu KK%.



Observed issuesObserved issues

Concurrency Control Mechanism needed – it could be handled by Unit of Work



Lessons LearnedLessons Learned

Technical:Work with SVN - Google Code Project HostingStruts & SiteMeshUnit of Work & Identity MapPatterns Combination:• Page Controller – Template View• Domain Model - Data Mapper – Identity Map

Team work – remote Reka



Lessons learnedLessons learned



Cum sa faci o arhitectura in Doodle:

To Be Continued…



c6mini Adina, R é ka, Marius 11 th of June, 2009

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