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Seamless Interoperability in Web Services: Challenges, Opportunities, and Solutions

Explore the complexities of Web Services interoperability, including SOAP, WSDL, and more, and learn how to address mismatches and divergences in hosting platforms for efficient service integration. Discover how MDA and platform independence can mitigate risks and enhance development processes.

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Seamless Interoperability in Web Services: Challenges, Opportunities, and Solutions

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  1. Web Services and Seamless Interoperability João Paulo Almeida (almeida@cs.utwente.nl) Luís Ferreira Pires (pires@cs.utwente.nl) Marten van Sinderen (sinderen@cs.utwente.nl) Centre for Telematics and Information Technology (CTIT), University of Twente

  2. Web Services are about… • SOAP, WSDL, XML Schema, UDDI, BPEL4WS, …

  3. Web Services are about… and about… • SOAP, WSDL, XML Schema, UDDI, BPEL4WS, … • Web Services hosting platforms • JAX-RPC / JSP / EJB / Java • .NET / CLR / XML Web Services / C# • CORBA / C++, Java, COBOL, … • CCM • Add your favourite: • middleware platforms • programming languages

  4. There are always other platforms involved

  5. Mismatch: Web Services x Hosting Platform • Mappings: • from and to Java in the JAX-RPC specification • from and to .NET’s Common Type System • from and to CORBA IDL • recurring: and then to programming languages • Can be automated, and spare us from a lot of work • (WSDL may be “human readable” (?) but I prefer Java)

  6. Mismatch: Web Services x Hosting Platform • Mismatch Example: • A Java developer is used to passing remote object references as parameters in J2EE • Not if an object is to be exposed as a web service endpoint (JAX-RPC) • Lots of patterns used will depend on references

  7. Mismatch: Web Services x Hosting Platform • Divergences in the behavior of components of different technology domains • E.g., use of the Naming Service in CORBA • Even if the mapping from SOAP/IIOP were transparent, requesters would have to be able to use the Naming Service • Rule of thumb: • Avoid exposing such “internal”characteristics in a web services definition • Works with trivial web services • Assumes services can be simplified regardless of complexity of service requester - service provider interactions

  8. Challenge: Seamless interoperation • Developers should be shielded from: • the existence of different middleware platforms and programming languages • and from the resulting mismatch • We need support to accommodate the differences, to: • provide abstractions that are suitable and intuitive for application developers, and • re-use specifications and components defined in terms of the abstractions of particular technology domains

  9. Opportunity: MDA and platform-independence

  10. Risk: it starts again...

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