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E-Business & Web Technology - 1 © Minder Chen, 2003-2004
IT Architectures
Minder Chen, Ph.D. Associate Professor of ISOM
George Mason UniversityFairfax, VA [email protected]
E-Business & Web Technology - 2 © Minder Chen, 2003-2004
Information Systems Triad
OperationalDatabase
InformationalDatabase
EnterpriseWorkflow
OLTP DSSEIS
Data Information
Knowledge
Messaging Systems
Workgroup Workflow
BusinessProcessWorkflow
E-Business & Web Technology - 3 © Minder Chen, 2003-2004
The Extended Enterprise
E-Business: Virtual and Dynamic Enterprise
SuppliersBackOffice
FrontOffice
Customers
Buy Make/Add Value Sell
Supply Chain Back Office Integration Demand Chain
ManufacturingFinance
Engineering
SalesSupport/Service
Marketing
Supply Chain Management Customer Relationship Management
Enterprise Resource Planning
© Minder Chen, 2001-2002
E-Business & Web Technology - 4 © Minder Chen, 2003-2004
LAN-Based Client/Sever Architecture
PCs
LAN
Printer
• Circa: Later 80’s
• Multiple servers provide file, print, communication, data base, and application services to clients
• Servers may be a PC, mini-computer or mainframe computer.
Servers
MiniMainframe
Applications
Storage
WAN: WideAreaNetwork
E-Business & Web Technology - 5 © Minder Chen, 2003-2004
Three Components and Five Style of Client/Server Processing
1. Distributed presentation
2. Remote Presentation
3. Distributed Function
4. Remote Data Management
5. Distributed Data Management
Presentation
Function
DataManagement
2-tier vs. 3-tier
E-Business & Web Technology - 6 © Minder Chen, 2003-2004
Five Styles of Client/Server Systems
Data
Mgmt.
Function
Data
Mgmt.
Data
Mgmt.
Data
Mgmt.
Data
Mgmt.
Presentation
Presentation
Distributed
Presentation
Function
Presentation
Function
Function
Presentation
Remote
Presentation
Distributed
Function
Function
Presentation
RemoteData
Management
DistributedData
Management
Function
Presentation
Data
Mgmt.
Network
E-Business & Web Technology - 7 © Minder Chen, 2003-2004
Application Model: Relationships of Categories of Services
E-Business & Web Technology - 8 © Minder Chen, 2003-2004
Web Applications
Web sites (Content-oriented)
Web-based Applications
C/S Applications (Transaction-oriented)
E-Business & Web Technology - 9 © Minder Chen, 2003-2004
3-tier Web Applications
Web server
Server-Side Script
Business Object
(Web browser)
File SystemsSMTP Server (send email)
ASP.NET
E-Business & Web Technology - 10 © Minder Chen, 2003-2004
Logical Application Architecture
RelationalDatabase
GraphicalUserInterface
RelationalDatabase
GraphicalUserInterface
BusinessObjectModel
GraphicalUserInterface
BusinessObjectModel
RelationalDatabase
2-tier 3-tier True 3-tier
Data ServiceClass
E-Business & Web Technology - 11 © Minder Chen, 2003-2004
Physical Application Architecture
Relational Database Server(s)
Client CWWW Browser
WebServer
HTMLCGI
ASP Java
Business ObjectServices
Business ObjectEngine
Application
Business ObjectServices
Client A
Business ObjectEngine
Thinner client, thicker server
Client BApplication
Business ObjectServices
Business ObjectEngine
Business Object Server
DCOMADO/R
CORBA Beans
COMMTS
BeansETS
E-Business & Web Technology - 12 © Minder Chen, 2003-2004
Building N-Tier Applications
Applications = Data Services + Business Logic + Presentation Logic
Analysis and Design =
Data Modeling + Process Modeling + GUI Design
ApplicationArchitecture Design
Database / XMLApplication Servers
• Business Objects• Data Access Object
Presentation Layers• Windows• Browsers• Mobile Devices
© Minder Chen, 2001-2002
OOAD(UML)
WebServi
ce
E-Business & Web Technology - 13 © Minder Chen, 2003-2004
Distributed Computing Architecture
ThinClient
RichClient
Firewall
Databases Legacy Systems
ExternalApplications
Business LogicData
Web Server
Web Server
LAN
/ Internet
Application Server
Presentation
HTMLXML
(B2B)
Development Tools
Systems Services
E-Business & Web Technology - 14 © Minder Chen, 2003-2004
Application Size and Technology
E-Business & Web Technology - 15 © Minder Chen, 2003-2004
EC Infrastructure
E-Business & Web Technology - 16 © Minder Chen, 2003-2004
Application Server - Compaq PIII 500
Client WorkstationHP Kayak XU-400
Database Server - Compaq PIII 500
SAP R/3Comment
Client Source CodeComment
(client.exe)
Oracle 8Comment
TCP/IP
TCP/IP
Sample UML Deployment Diagram
UML: Unified Modeling Language; An Object-Oriented Analysis and Design Method
