Web Service Architecture

8/2/2019 Web Service Architecture

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Technical Progressive SeminarOn

Web Service Architecture

By

Ayesha Faheem 08871A0509Under the Supervision of

K.Narahari

Asst. Professor


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Whats Web Service?

The "Web service defines as "a softwaresystem designed to support interoperablemachine-to-machine interaction overa network".

It has an interface described in a machine-processable format (specifically Web ServicesDescription Language WSDL). Other systemsinteract with the Web service in a mannerprescribed by its description

using SOAP messages, typically conveyedusing HTTP with an XML serialization inconjunction with other Web-related standards.


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Web service architecture identifies the functionalcomponent and defines the relationships amongthose components to affect the desired propertiesof the overall architecture.

This is a public working group note produced bythe W3C Web Services Architecture WorkingGroup, which is part of the W3C Web ServicesActivity.

Web Service Architecture is an interoperabilityarchitecture it identifies those global elements of theglobal Web service network that are required inorder to ensure interoperability between Webservices.

Web Service Architecture


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Web Service Model

Operations in a Web ServiceArchitecture Publish

Service descriptions need to be published inorder for service requestor to find them

Find Service requestor retrieves a service

description directly or queries the serviceregistry for the service required

Bind Service requestor invokes or initiates an

interaction with the service at runtime


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SOAP: Simple ObjectAccess Protocol

What is SOAP? SOAP is a communication protocol

SOAP is for communication between applications

SOAP is a format for sending messages

SOAP is designed to communicate via Internet SOAP is platform independent

SOAP is language independent

SOAP is based on XML

SOAP is simple and extensible SOAP will be developed as a W3C standard


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SOAP Message Structure

Request and Response messages

Request invokes a method on a remoteobject

Response returns result of running themethod

SOAP specification defines an envelop

envelop wraps the message itself

Message is a different vocabulary

Namespace prefix is used to distinguishthe two parts

Application-specificmessage vocabulary

SOAP Envelop

vocabulary


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Web Services DescriptionLanguage

What is WSDL?

WSDL is written in XML

WSDL is an XML document

WSDL is used to describe Web services

WSDL is also used to locate Web services

WSDL is not yet a W3C standard

Operational information about the service

Location of the service

Service interface

Implementation details for the service interface


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WSDL Document Structure

element Defines a web service, the operations that

can be performed, and the messages thatare involved

element Defines the data elements of an operation

consists of one or more parts.

The parts can be compared to theparameters of a function call in atraditional programming language


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WSDL Document Structure

element

Defines the data type that are used by the

web service For maximum platform neutrality, WSDL

uses XML Schema syntax to define data

types element

Defines the message format andcommunication protocols used by the web

service


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Universal Description, Discoveryand Integration (UDDI) What is UDDI?

Directory service where businesses can register andsearch for Web services

Directory for storing information about web services

Directory of web service interfaces described by WSDL

UDDI communicates via SOAP

What is UDDI Based On?

Uses W3C Internet standards such as XML, HTTP, andDNS protocols

UDDI uses WSDL to describe interfaces to web services


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UDDI Roles and Operations

Service Registry

Provides support for publishingand locating services

Like telephone yellow pages

Service Provider Provides e-business services

Publishes these services througha registry

Service requestor

Findsrequired services via theService Broker

Binds to services via ServiceProvider


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Conclusion

Web Services substitute for existingdistributed computing model such as RPC.

To apply to real e-business application,the following problems should be covered Security

Transaction Management

QOS (ex., reliable message transmission)

Efficient methods for composing WebServices


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Java Web Service Architecture, byJames McGovern and Sameer Tyagi,First Edition Morgan Kauffman

Publishers,2003.Habegger.B Quafafou.M, Web Service

for Information Extraction from the

web.http://en.wikipedia.org/wiki/web_servic

e.

References


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THANKYOU!!!

Web Service Architecture

Documents