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Web Service

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What is Web Services?Web Services ArchitectureWeb Services StandardsWeb Services DevelopmentWeb Services Live ExampleUse Of Web Service In TA

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What is Web Service ?

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A web service is a software system designed to support interoperable machine-to-machine interaction over a network.

It has an interface described in a machine-process able format (specifically WSDL).

Other systems interact with the Web service in a manner prescribed by its description using SOAP messages, typically conveyed using HTTP with an XML serialization in conjunction with other Web-related standards.

Web Service Definition by W3C

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Server

Clients

Internet

Servers

Clients

Client-Server Web Applications

Evolution of Distributed Computing

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Web Services/ Peer-to-peer

Servers

Servers

Clients

ClientsClients

Clients

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Inter-EnterpriseProgramming language independentMessage-drivenCan be bound to different transportsLoosely-coupled

Web Services

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Web Services Architecture

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Simplified Architecture

Web Service Provider

Registry

Web Service Requester

PUBLISH

1. Service registers

BIND

3. Calls service

DISCOVER

2. Request service location

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Web Services Standards

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XML WSDL Web Services Description Language SOAP Just an acronym UDDI Universal Description, Discovery and

Integration

Core Standards

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Based on XMLMessage Based Independent of Programming LanguagePotentially dynamic assemblyAccessed over InternetLoosely Coupled

Web Services Characteristics

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Live Example

Google,Yahoo,Amazon Search Engine Web Services (http://www.flash-db.com/Google/)

Currency Converter Web Services

Travel Agent App(makemytrip,yatra)

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Web Services Usage Scenario

LookupRequest WSDL

Web Service Requester

Publish

Publish

Publish

End-user Application Travel Agency

RepositoryUDDI Airline

Reservation

Hotel Reservation

Taxi Booking

Web Service Providers

Internet(HTTP, SOAP,

XML)

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Advantages

Platform neutral

Standard accessibility

Inter-operable

Relatively cheap to build and assemble

Simplifies enterprise integration

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J2EE .NET

Development Platforms

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Use In Think Ahead

Itrack Product Function can be Provided as aWeb service

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