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Transcript

  • 1. W eb S ervices Introd uction to
  • 2. Agenda The Past 1 The Present 2 The Future ( definitely it’s Web Services  ) 3 A peep into the future 4
  • 3. The Past
    • Client Server Architecture
      • Problems it faced:
          • Scalability
          • Single point failure
  • 4. The Present
    • 3-tier Architecture
      • What it uses
        • DCOM (Distributed Component Object Model)
        • RMI (Remote Method Invocation)
        • CORBA (Common Object Request Broker Architecture)
      • Problems it faced:
          • Interoperability
          • Tight coupling
          • Crossing firewall
  • 5. Get ready for the future…
    • Web + Services
      • Web – The facilities are provided via World Wide Web.
      • Services – Facilities provided to you by some provider.
  • 6. A classic example
    • Courier Delivery system
    • “I wanted this parcel to reach on time. I don’t bother how your delivery system works.”
    • “I don’t bother that you are late because the delivery van was stuck in some problem.”
    Encapsulation Loose Coupling
  • 7. The Future
    • Web Services
      • Solution to earlier problems
        • Encapsulation
        • Loose coupling
        • Contract based architecture
    • A formal definition
        • “ Web Services are encapsulated, loosely coupled contracted Service Provider functions offered via standard protocols”
            • - WebServices.org
  • 8. A peep into the future…Architecture
  • 9. A peep into the future… SOAP ( S imple O bject A ccess P rotocol) Web Services WSDL ( W eb S ervices D efinition L anguage ) UDDI ( U niversal D iscovery D escription I ntegration ) Protocols used 
  • 10. A peep into the future…Protocols
    • SOAP
      • Used to exchange messages between Service Requester , Service Broker and Service Provider
  • 11. SOAP contd…
  • 12. A peep into the future…Protocols
    • WSDL
      • WSDL describes network services by using an XML grammar
  • 13. A peep into the future…Protocols
    • UDDI
      • It represents the service broker that enables service requesters to find a suitable service provider
  • 14. Architecture + Protocols
  • 15. A friendly note…
      • KISS
      • K eep I t S imple , S tupid!
    “ Keep it simple. When in doubt during design, choose the simplest solution.” - Brian Carpenter , Internet Architecture Board
  • 16. Thank you
  • 17. “ The Question” Award ?