seminar Slide Show

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EKTA BHALWARA

B.E. 7TH SEM(CSE)

UNDER GUIDANCE OF-

ASSISTANT PROF. ALOK SINGH

GEHLOT

OBJECT AND COMPONENT

BASED MIDDLEWARE

FOR DISTRIBUTED SYSTEM

DEVELOPMENT

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What is Distributed

System(D.S.)?A distributed system is a collection of independent

computers that appears to its user as a singlecoherent system

They have following characteristics

Concurrency of components

Resource sharing

Fault tolerance Transparency

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MIDDLEWARE

Middleware is the layer of software that mediatesbetween an application and a network.

Types of middleware

Transaction oriented

Message oriented

Procedural

Object and component oriented

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Architectures for DS

CORBA

DCOM

J2EE

ASP.NET

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CORBA(Common Object Request

Broker Architecture) - 1995

The CORBA specification was developedby Object Management Group(OMG).

CORBA is a standard that enables anobject written in one programming

language, running on one platform to

interact with objects across the network that

are written in other programming languagesand running on other platforms.

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Main Features of CORBA

ORB Core OMG Interface Definition Language

(OMG IDL)

Stubs and Skeletons Portable Object Adapters

Inter-ORB Protocols

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LIMITATIONS OF CORBA

CORBA was not able to manage theload of complexity, demand, size of

resources. No effective loadmanagement

Resources could not be shared due to

protocol mismatch.

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Solution?

Java Community Program organizedand designed a protocol package that

was common in use. This package

consisted ofWSDL, UDDI, SOAP.

Multi-tier architecture was proposedby SUN for effective load

management. This architecture was

J2EE.

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J2EE (Java 2 Enterprise

Edition)

Open and standard distributedcomponent based platform

developed by SUN

MICROSYSTEMSfor developing,

deploying and managing n-tier,

Web-enabled, server-centric, and

component-based, portable

enterprise applications

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J2EE n-tier architecture

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J2EE Best Practice MVC

Pattern

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J2EE Components Web Container

Java Server Pages(JSP)

for dynamic web pages (document oriented)

Servlets

point of entry for processing HTTP request(programming oriented)

Enterprise Java Beans(EJB) Container

Session Beans

provides functionality / service

Entity Beans

representation of business data

Message driver Beans

responsible for receiving messages ,via JMS

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Why EJB technology?

Simplifies development of D.S.

Lets developers concentrate on

business oriented aspects ratherthan complex issues.

Practical implementation ofreusability.

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References

[1]- Engineering Distributed Objects; Wiley & Sons, 2000.

[2]- Objects and Components

http://www.cetus-links.org

[3]Object Management Group; CORBA Basics

http://www.omg.org/gettingstarted/corbafaq.html

[4]

Research into the interoperability of enterprise informationtechnologies (Yoshi Hasegawa MSE May 2001)

[5]Lecture slides of Architecture of Software Systems CMU-SCS Spring 2001

[6]- J2EE Tutorial

http://java.sun.com/j2ee/tutorial/

[7]- OMG: CORBA Components. Joint Initial Submission, OMG 97-11-24, OMG 1997

[8]- OMG: CORBA 2.2 Specification, OMG 98-2-33, OMG, 1998

[9]- OMG: CORBA services Specification, Event Management Service, OMG document FORMAL/97-2-

9, OMG 1997

[10]- taken from [SUN] Sun Microsystems :J2EE Tutorial

[11]- http://www.sun.com/developers/evangcentral/presentations/j2eeoverview.pdf

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Thank You