Middleware
ITU Workshop, Bangalore
August 29 - 31, 2001
S Sadagopan, iiit-b ---- ss@iiitb.ac.in
Overview
Application Development
Client Server Architecture
Internet and Web-enablement
Information Publishing
Persistent Applications
Architecture of Middleware
Middleware Products
Pointers to information
Q&A
2
Application Development
Till 1995
Project based development
Proprietary systems
Long development cycles
Post 1995
Product-based development (ERP is a classic case)
Open systems (O/S, DBMS, Network)
Shorter development cycles (RAD)
3
Client Server Architecture
Three-tier architecture
Database server
Application server
Presentation server
Dominance of Windows
Both hardware-level and software level C/S architecture
Development of n-level architecture
Browser becoming the universal client
4
Internet and Web-based Development
Dramatic growth of the Internet
HTTP and HTML as lightweight, efficient, “state-less”
protocols
Widespread adoption, ease of availability, free
Every application getting a browser front end
TCO minimization becoming the key driver
Scalability becoming important
5
Internet and Web-based Development
(contd.)
Dot Com growth created unprecedented interest
Every one was publishing his / her “home page”
Every company had a “web site”
Every application had to be up & running all the time
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Information Publishing
HTML editors made publishing far easier
Every user got used to HTML pages / hypertext
links / access to variety of information
(multimedia)
Every application could be delivered to the
browser through a “plug-in”
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Web-enabling every application
Browser becoming universal interface, every
application was getting web-enabled
Web server became the most important server
HTML / HTTP not suited for persistent application
& database processing
Client Server computing coming back through
client side components & server side
components
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Web-enabling every application
(contd.)
Evolution of JavaScript to applications beyond
publishing
Emergence of Java particularly EJB & J2EE
Component-based technology (EJB, COM, CORBA)
picking up
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Persistent Applications
Transaction processing
Security issues
VPN and tunneling protocols
Delivering streaming objects
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Architecture of middleware
products
Tuxedo kind of products as well as mainframe products like
IBM MQ series
Freeing presentation from application servers
Working with any ODBC / JDBC compliant databases
(thanks to SQL)
Security, Availability, Scalability that can be built by design
through the architecture
Working with new generation network protocols and
storage environments
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Middleware Products
BEA Weblogic
IBM Websphere
Sun Netscape iPlanet
Borland Appserver
Pramati Appserver from Hyderabad, India
40+ products
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Middleware Products Features
HTTP engine
Security engine
Transaction / messaging server
Database connector
Network adapters
High availability components
Performance monitors / Load balancing
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Pointers to Information
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Thank You
Any questions?
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