Web%20Services - PowerPoint PPT Presentation

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Web%20Services

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Title: Web Services Author: Yoshiyuki Shibata Last modified by: Business Services Created Date: 5/19/2005 1:20:29 AM Document presentation format – PowerPoint PPT presentation

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Title: Web%20Services


1
Web Services
  • By Ethan
  • Justin
  • Yuli

2
Web Services in Action
What do Web Services offer developers, businesses
and consumers?
  • Information through Integration
  • (Google Example)

3
Web Services in Action (continued)
  • Google.com
  • Google Web APIs service gives you query access to
    Google's web search, giving developers access to
    billions of web documents that are constantly
    refreshed
  • Developers receive results as structured data,
    can access information in the Google cache, and
    check the spelling of words
  • Examples of use
  • Issuing regularly scheduled search requests to
    monitor the web for new information on a subject
  • Performing market research by analyzing
    differences in the amount of information
    available on different subjects over time
  • Searching via non-HTML interfaces, such as the
    command line, pagers, or visualization
    applications
  • Creating innovative games that play with
    information on the web

4
Web Services in Action (continued)
  • Amazon.com
  • Add thousands of products available through
    Amazon.com to your own website and earn referral
    commissions for sales
  • List hundreds of thousands of products on your
    site available through Amazon.com affiliates and
    customize the content so products match the theme
    of your web site
  • Dynamically maintain product listings to give
    visitors current information

5
Presentation-Outline
  • Topics
  • SOAP and REST
  • WSDL
  • UDDI
  • Summary
  • Questions

6
Web Service-Overview
  • Web services facilitate the automated transfer of
    information from Computer A to Computer B using
    the XML language.
  • This can be accomplished in a number of ways, but
    for today were focused on Standards based
    approaches

7
Web Services- Two Approaches
  • There is a division in the web community about
    the best method for accessing resources over the
    internet.
  • The two leading methods are SOAP, a
    standards-based approach, and REST

8
Web Services-SOAPStandards Based Approach
  • Definition Simple Object Access Protocol
  • Function SOAP is an envelope that a request for
    resources is packaged in. It includes a header
    and body.
  • The header can include information about
    security, recipients, handling, routing, etc.
  • The body includes a standard XML request

9
Web Services-RESTNon-Standards Based Approach
  • Definition Representation State Transfer
  • Function REST is an architectural style for
    accessing distributed media or resources.

10
Summary of REST and SOAP
  • REST
  • Messages are represented in plain XML
  • HTTP is used for the transfer protocol
  • HTTP verbs are used for access/manipulation
    commands
  • URIs are used to uniquely identify resources in
    message
  • HTTP authentication provides security
  • There is no formal method for expressing the
    interface contract
  • SOAP
  • Messages are represented in a standardized XML
    SOAP "envelope"
  • Can be bound to various protocols including HTTP
    and SMTP
  • Access to and manipulation of data are
    application specific
  • Security is not described by SOAP and is to be
    provided by the developer
  • XML schemas or DTD are used to define the
    contract between client and service

11
Web Services Description Language (WSDL)
  • WSDL is a language for describing the
    capabilities of Web services
  • In order for computer A to request information
    from computer B it must know the appropriate
    method for asking the question
  • Essentially, a WSDL document describes how to
    invoke a service and provides information on the
    data being exchanged, the sequence of messages
    for an operation, protocol bindings, and the
    location of the service.
  • WSDL is an integral part of UDDI, an XML-based
    worldwide business registry

12
Web Services-UDDI(Yellow Pages for Web Services)
  • Definition Universal Description Discovery and
    Integration
  • Function The UDDI specifications define a
    registry service for Web services and for other
    electronic and non-electronic services. A UDDI
    registry service is a Web service that manages
    information about service providers, service
    implementations, and service metadata.
  • Service providers can use UDDI to advertise the
    services they offer.
  • Service consumers can use UDDI to discover
    services that suit their requirements and to
    obtain the service metadata needed to consume
    those services.

13
Key Topics to Remember
  • Summary
  • WSDL Standards-Based Description language for
    making resource requests
  • SOAP Standards-Based Envelope for delivering the
    request
  • REST Messages are represented in plain (pure)
    XML only
  • UDDI Voluntary registry for listing and finding
    web services (Yellow Pages)

14
Questions??
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