Web Services - Crude Ppt

Invoking a web service

First, it is necessary to provide an abstract definition of the service, including the details that allow anyone who wants to use the service to bind to it in the appropriate way.

Second, those people who are the providers of services need to publish details of their services so that those who want to use them can understand more precisely what they do and can obtain the information necessary to connect to use them.

Third, those who require services need to have some way to find what services are available that meet their needs.

According to the SOA

A Web service is:

An Interface That Describes A Collection Of Network Accessible Operations

Described Using A Service Description Language

Published By Making This Service Description Available To Users

Found By Sending Queries To A Registry Matching Service Descriptions

Bound-invoked By Using The Information Contained In The Service Description

Composed With Other Services To Create New Services (Service Orchestration)

All the technologies in Web Services are XML based Messaging Description Are all in XML Registry

Why? XML is pure text with no binary data Applications read the XML Applications share data using XML . Any application

can talk to any other Application using XML(unlike binary) irrespective of

the platform XML is a method for putting structured data in a

text file

UDDI Universal Description Discovery and Integration

Marketplaces, search engines, and business apps query the registry to discover services at other companies

3.

Business uses this data to facilitate easier integration with each other over the Web

4.

2.

• Businesses populate the registry withdescriptions of the services they support

BusinessDescriptions

SW companies, standards bodies, and programmers populate the registry withdescriptions of different types of services

1.

Service Types

How it works all together

Wire Stack

Envelope Extensions

XML Messaging

Data Encoding

NetworkProtocol

Secu

rity

Man

ag

eab

ility

Qu

ality

of S

erv

ice

Http(s), smtp,ftp etc

XML and SOAP

SOAP

SOAP Headers

Agreements

Process

Service Interface

Service Implementation

XMLXML Schema

WSDL

WSDL

WSEL

WSFL

Description Stack

Discovery Stack Directory

InspectionADS/DISCO

UDDI

WSDL – Web Services description LanguageUDDI – Universal Description, Discovery and Interaction

Web services interoperability stack