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Web Services: Evolution, Technologies, Integration, and Access

Explore the evolution of web services, their technologies, integration capabilities, access methods, and the SOAP protocol. Learn how web services enable machine-to-machine communication and application assembly from diverse services. Discover how to describe and find web services using standards like WSDL and UDDI. Dive into the adoption of web service protocols in the current internet landscape.

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Web Services: Evolution, Technologies, Integration, and Access

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  1. 2006 IEEE International Conference on Web Services ICWS 2006 Overview

  2. Contents • Introduction to Web Services • SOA • WS-* Standrads • Amazon Web Services • Complex Events Processing

  3. Introduction to Web Services

  4. Web Services: W3C Definition • A Web service is a software system • Identified by a URL, whose public interfaces and bindings are defined and described using XML • Its definition can be discovered by other software systems • These systems may then interact with the Web service • using XML based messages conveyed by Internet protocols

  5. Web Services • Web services are an emerging technology that offer a solution for providing a common collaborative architecture • Web services provide functional building blocks which are not tied to any particular programming language or hardware platform • They are accessible over standard Internet protocols

  6. The Evolution • Online systems replace Batch systems • Graphical User Interfaces replace “green” screens • Networked systems replace standalone systems • Internet based systems replace LAN based systems • Future ??? • Web Services replace simple Internet and LAN based systems

  7. Web Services Technologies • XML (eXtensible Markup Language) • markup language that underlies most of the specifications used for Web services • SOAP (Simple Object Access Protocol) • (Simple Object Access Protocol), similar to JDBC, is a network, transport, and programming language and platform neutral protocol that allows a client to call a remote service. The message format is XML. • WSDL (Web services description language) • An XML-based interface and implementation description language. The service provider uses a WSDL document in order to specify the operations a Web service provides.  • UDDI (universal description, discovery, and integration) • Both a client-side API and a SOAP-based server implementation that can be used to store and retrieve information on service providers and Web services.

  8. How it works • A Web Service is a URL-addressable software resource that performs functions (or a function) • Web Services communicate using standard protocol known as SOAP (Simple Object Access Protocol) • A Web Service is located by its listing in a Universal Discovery, Description and Integration (UDDI) directory

  9. Web Services Integration • In a lot of organizations, the data and logic of one application are basically useless to other applications • When an application and its data are isolated from other applications, we often say that they are in “silos” • Web Services are better at sharing data and functions • The result is that the “silos” come down, and previously isolated systems can talk to each other

  10. Web Services Access • Web Services are especially good at providing access through different interfaces • A Web Service can have a dedicated client application, but it can also be readily accessed through browsers, wireless devices, voice-activated interfaces, and so on • Adding new access methods is much simpler than with a traditional application

  11. Web Services Flexibility • One of the more important innovations in Web Services is “machine-to-machine communications” • This means that a Web Service can ask another Web Service to do something, and that Web Service can ask another Web Service to do something, and so on • In the future, many Web Services will really just be aggregations of other Web Services

  12. Web Services Application Assembly • Future applications will be assembled from a diverse group of web services, aggregating functionality • Reusability is extended to the execution level, versus reusability from just the design and construction level

  13. SOAP • Simple Object Access Protocol • SOAP is an open protocol specification defining a uniform way of performing RPCs using HTTP as the underlying communications protocol with XML for the data serialization.

  14. How Is a Service Described? • WSDL (Web Service Description Language) • XML-based • W3C for standard

  15. How Do I Find Web Services? • UDDI project by Microsoft, IBM, and others • Take a look at uddi.org • Websites • //www.xmethods.net • //www.salcentral.com

  16. XMethods

  17. Currency Exchange

  18. Using the Currency Exchange Web Service Currency Exchange WS RV Application Internet

  19. Current Web Service Protocol Stack

  20. Adoption of Web Service Protocols

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