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Understanding Web Services. Presented By: Woodas Lai. Understanding Web Services. By Jaideep Roy and Anupama Ramanujan What is Web Services? Architecture Core technologies XML SOAP WSDL UDDI. What is Web Services?. A Web Services is a unit of application

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understanding web services

Understanding Web Services

Presented By: Woodas Lai

understanding web services1
Understanding Web Services
  • By Jaideep Roy and Anupama Ramanujan
  • What is Web Services?
  • Architecture
  • Core technologies
    • XML
    • SOAP
    • WSDL
    • UDDI
what is web services
What is Web Services?
  • A Web Services is a unit of application

logic providing data and services to other

applications

  • They are published to the Web in such a way

that other applications can find and use them

examples of web services
Examples of Web Services
  • a credit card service that

processes credit card transactions

for a given account

  • a market data service that

provides stock market data

associated with a specified

stock symbol

core technologies
Core Technologies
  • Technologies for Web Services
    • XML
    • UDDI ( XML Based )
    • SOAP ( XML Based )
    • WSDL ( XML Based )
slide7
SOAP
  • Simple Object Access Protocol (SOAP)

http://www.w3.org/TR/SOAP/

  • A lightweight XML communication message protocol
soap overview
SOAP Overview
  • Describe the messaging format for machine-to-machine communication
  • Enable procedure calls on remote objects
    • Define elements to specify remote function names, parameters and return types
soap overview1
SOAP Overview
  • Support different Internet protocols, such as HTTP, SMTP, FTP (Protocol neutral)
  • SOAP = XML + RPC + HTTP (Typical use)
    • A SOAP document is an XML document designed to invoke methods on remote computers over HTTP
soap example
SOAP Example

<env:Envelope xmlns:env="http://www.w3.org/2001/06/soap-envelope" >

<env:Header>

……

</env:Header>

<env:Body>

<m:GetLastTradePrice env:encodingStyle= "http://www.w3.org/2001/06/soap-encoding" xmlns:m="http://example.org/2001/06/quotes">

<symbol>DIS</symbol>

</m:GetLastTradePrice>

</env:Body>

</env:Envelope>

slide13
WSDL
  • Web Services Description Language (WSDL)

http://www.w3.org/TR/wsdl

  • Description of Web Services via XML-based standard format
  • Define the set of functions supported by the server and the formats a client should be used to request the service, like IDL in CORBA
slide14
WSDL
  • WSDL is used to describe the web services.

So, how to describe?

    • WSDL has its own XML vocabulary defined so as to describe the web service
slide15

WSDL

WSDL has a well-defined XML vocabulary to answer

the following questions regarding the web service

involved:

  • What does the service do?
    • Both in machine and human-readable forms
  • What language does the service speak?
    • The format/data structure of the message exchanged
slide16

WSDL

  • How does the client talk to the service?
    • HTTP/SMTP/FTP
  • Where is the location of the web service?
    • The access point (URL)
slide17
WSDL

<?xml version="1.0" encoding="UTF-8" ?>

<wsdl:definitions

targetNamespace="http://137.189.94.136:8080/axis/echo.jws" xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:apachesoap="http://xml.apache.org/xml-soap" xmlns:impl="http://137.189.94.136:8080/axis/echo.jws" xmlns:intf="http://137.189.94.136:8080/axis/echo.jws" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:wsdlsoap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<wsdl:message name="echoStringResponse">

<wsdl:part name="echoStringReturn" type="xsd:string" />

</wsdl:message>

<wsdl:message name="echoStringRequest">

<wsdl:part name="str" type="xsd:string" />

</wsdl:message>

slide18
WSDL

<wsdl:portType name="echo">

<wsdl:operation name="echoString" parameterOrder="str">

<wsdl:input message="intf:echoStringRequest"

name="echoStringRequest" />

<wsdl:output message="intf:echoStringResponse" name="echoStringResponse" />

</wsdl:operation>

</wsdl:portType>

<wsdl:binding name="echoSoapBinding" type="intf:echo">

<wsdlsoap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"

/>

<wsdl:operation name="echoString">

<wsdlsoap:operationsoapAction="" />

<wsdl:input name="echoStringRequest">

<wsdlsoap:bodyencodingStyle="http://schemas.xmlsoap.org/soap/encoding/"

namespace="http://137.189.94.136:8080/axis/echo.jws" use="encoded" />

</wsdl:input>

slide19
WSDL

<wsdl:output name="echoStringResponse">

<wsdlsoap:body

encodingStyle=http://schemas.xmlsoap.org/soap/encoding/

namespace=http://137.189.94.136:8080/axis/echo.jws

use="encoded" />

</wsdl:output>

</wsdl:operation>

</wsdl:binding>

<wsdl:service name="echoService">

<wsdl:port binding="intf:echoSoapBinding" name="echo">

<wsdlsoap:address location="http://137.189.94.136:8080/axis/echo.jws" />

</wsdl:port>

</wsdl:service>

</wsdl:definitions>

slide20
UDDI
  • Universal Description, Discovery, and Integration
  • Specifications for service description and discovery
  • Open-Standard
    • Raised By Ariba, IBM and Microsoft
    • http://www.uddi.org (by Oasis)
  • XML-based message
service architecture
Service Architecture

UDDI defines a way to publish and discover information about Web services

slide22
UDDI
  • Information about the business (company name, company address ……)
  • Categorization of the business and its services
  • Technical information about services provided by a business (like the URL to invoke the Web Services)

White Page

Yellow Page

Green Page

core structures of uddi
Core Structures of UDDI
  • Business Entity
    • White Pages information
  • Business Services
    • Yellow Pages information
  • Binding Templates
    • Green Pages information
    • Contains references to tModels
  • tModels
    • Service Type Definitions
    • Interface specifications for a service (WSDL)
research challenge
Research Challenge
  • How to secure the Web Services Invocation?
  • How to ensure the reliability of the Web Services?
  • How to deal with the Quality of Services?