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Exploring the Grids of the Near Future: Web Services and Grid Services

Dive into the world of web services and grid services, discover how they work, their benefits, their integration with databases, and the latest developments in the industry. Explore the possibilities for dynamic service instances creation and the importance of open standards in creating a connected digital environment.

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Exploring the Grids of the Near Future: Web Services and Grid Services

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  1. Grids - the near future Mark Hayes NIEeS Summer School 2003

  2. Web services • A web service is a network-accessible application • identified by a URI • e.g. http://terraservice.net/TerraService.asmx?op=GetTile • with an interface defined in terms of XML based messages • these messages transported by internet protocols (usually HTTP) • The application & its interface definition should be • ‘discoverable’ by other applications • independent of OS platform & programming language. • W3C standards body: http://www.w3c.org/

  3. Acronym soup XML - eXtensible Markup Language XSLT - eXtensible Stylesheet Language Transformations SOAP - Simple Object Access Protocol WSDL- Web Service Description Language UDDI - Universal Description, Discovery & Integration protocol BPEL - Business Process Execution Language WSIF - Web Services Invocation Framework …..

  4. terraservice.net Web service interface to http://terraserver.microsoft.com/ Example app: US Department of Agriculture have a database of soil properties, ‘federated’ with terraservice.net to provide geographical & topographic detail.

  5. Grid services An extension of web services to provide for the dynamic creation (and destruction) of service instances. Why is this useful? Consider submitting a job… OGSA: Open Grid Services Architecture builds on... OGSI: Open Grid Services Infrastructure GGF standards body: http://www.gridforum.org/ OGSI specification now in GGF comments period. The community develops OGSA services.

  6. Database Access & Integration OGSA services for federation of XML & relational databases. http://www.ogsadai.org.uk/

  7. Globus Toolkit v3 A re-implementation based on OGSI, though many services are wrappers around GT2 implementation. “Production” release just out: June 30th. Intended backwards compatibility with GT2.

  8. The UK Grid in the next year GT2 based Grid will continue for at least the next year. In parallel, GT3 evaluation & experimental Grid On-going efforts to produce documentation, improve resource management & accounting, a user group…

  9. UK eScience - future plans Digital curation centre - software development, best practices Open Middleware Institute - repository & software engineering of UK grown middleware More applications!

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