MTU SSE 3200 - Web services extensions (24 pages)

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Web services extensions



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Web services extensions

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Lecture Notes


Pages:
24
School:
Michigan Tech
Course:
Sse 3200 - Analysis and Design of Web Based Services

Unformatted text preview:

Web Services Concepts Architecture and Applications Part 8 Web services extensions Gustavo Alonso and Cesare Pautasso Computer Science Department ETH Z rich alonso inf ethz ch http www inf ethz ch alonso Extending basic Web services SOAP WSDL and UDDI provide the basic infrastructure for Web services In real applications however additional functionality is needed Currently there are literally several dozen proposals on different extensions to Web services covering almost every conceivable aspect These proposals are evolving very quickly and disappear merge or change too rapidly to really influence actual systems Looking at these extensions provides a good idea of the mind set of some of the vendors pushing for Web services and where they hope to get an advantage over competitors As examples of some of these existing proposals we will briefly review WS Coordination WS Transactions WS Security ETH Z rich Part 8 Extensions 2 WS Coordination ETH Z rich Part 8 Extensions 3 WS Coordination WS Coordination is intended as a generic infrastructure to implement coordination protocols between Web Register for a Start a coordination services coordination protocol protocol Its main goal is to serve as a generic platform for implementing advanced transaction models but it can be used to implement a wide variety of coordination protocols between Activation Registration services including some forms of service service conversations WS Coordination encompasses a set COORDINATOR of behaviors and APIs which enable Coord Coord a module to extend Web services Protocol Protocol with coordination capabilities A B It mirrors the behavior of transactional services in conventional middleware platforms Operations of coordination protocol ETH Z rich Operations of coordination protocol Part 8 Extensions 4 Basics of WS Coordination 1 CreateCoordinationContext for coordination type Q APPLICATION A APPLICATION B Context Ca activity identifier A1 coordination type Q supporting protocol Y



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