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Protecting Application Developers – A Client Toolkit for OGSA-DAI

Protecting Application Developers – A Client Toolkit for OGSA-DAI. Alastair Hume (A.Hume@epcc.ed.ac.uk) Tom Sugden, Mike Jackson, Mario Antonioletti, Neil Chue Hong, Amy Krause and Martin Westhead. OGSA-DAI Client Toolkit.

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Protecting Application Developers – A Client Toolkit for OGSA-DAI

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  1. Protecting Application Developers – A Client Toolkit for OGSA-DAI Alastair Hume (A.Hume@epcc.ed.ac.uk) Tom Sugden, Mike Jackson, Mario Antonioletti, Neil Chue Hong, Amy Krause and Martin Westhead

  2. OGSA-DAI Client Toolkit • A high-level API for writing client-side interactions with OGSA-DAI services • Aims: • Provide a clear and simple API built around solid abstractions • Minimise specialist knowledge and the number of steps required to achieve results • Protect to the application developer from future changes to the OGSA-DAI interfaces

  3. Solid Abstractions • Registry • Grid Data Service Factory • Grid Data Service • Request • Constructed from Activities • Response • Easily converted to appropriate types, e.g. ResultSet or ResourceSet.

  4. Minimise Specialist Knowledge

  5. Minimise the Number of Steps

  6. Protection From Future Changes • Proposed Web and Grid standards in state of flux • Changes to standards cause changes to the OGSA-DAI interface • Especially OGSI->WS-RF and DAIS • Client toolkit will hide a lot of these changes from the application developer • Client toolkit makes OGSA-DAI a more stable solution in these times of constant change

  7. Future for Client Toolkit • Data Resource concept may replace the GDSF and GDS • Loosens coupling between client toolkit and service architecture • Will work with all future supported OGSA-DAI interfaces – OGSI, WS-RF, WS-I • Automatically switch to the appropriate interface for the service? • Depreciation policy • Standardisation across all OMII products at client toolkit level?

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