1. INFSO-RI-508833 Enabling Grids for E-sciencE www.eu-egee.org BAR: The Current Status Charaka Palansuriya EPCC

2. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 2 Content Active tasks: –Updates to the BAR specification document, DJRA4.1 –Updates BAR architecture –WSDL and XML Schema definitions for BAR & NSAP –Development of a basic prototype Further work

3. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 3 BAR specification document Updates to DJRA4.1: –BAR and NSAP interfaces in DJRA4.1 are updated  Added mandatory parameters (based on service classes)  Added units for parameter (not all are defined yet) –Updates are available as separate documents. –To be merged to DJRA4.1 and increase its version.

4. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 4 BAR architecture Current BAR architecture: –Requests are now based on Service Classes  E.g., Bulk Transfer (BT), Virtual Leased Line (VLL)

5. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 5 BAR architecture Operations in (conceptual) Port types:

6. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 6 BAR architecture

7. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 7 BAR architecture An alternative architecture: –A separate web service for each Service Class

8. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 8 BAR architecture Should we choose this architecture ? –Pros:  Simpler interfaces and implementations  A server can just publish the web services corresponding to the Service Classes it can offer.  No changes required to NSAP –Cons:  How does a user know which component BAR web services (i.e., Service Classes) are offered by a server ? Use a registry ?  View of a single concrete BAR service is lost  Multiple web services to manage

9. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 9 WSDLs and Schemas for BAR & NSAP WSDL descriptions of BAR and NSAP web services are now available –Initial versions –Issues with generating the client stubs using the NSAP WSDL W3C XML Schema is used to define XML elements inside SOAP body –i.e., we use document-centric (as opposed to RPC). –Note: MUST only use W3C XML schema to define types and WSDL for the web services we develop  This is to comply with WS-I Basic Profile 1.0

10. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 10 Prototype Dummy Java prototypes for BAR and NSAP are available. The dummy BAR service creates and sends a predefined response. A Java client to drive the BAR service is also available. Currently there is no communication between BAR and NSAP –Need to resolve issues with NSAP WSDL

11. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 11 Software Development guide lines A JRA4 developers guide is being produced –An important document for BAR and NSAP development –Summarises important items in the JRA1 developers guide –NOT a competing guide for JRA1’s version –Specifies the version of software/libraries be used  This should be same as the ones in JRA1 developers guide. If not, items should be highlighted and give reasons.

12. Enabling Grids for E-sciencE INFSO-RI-508833 EGEE-JRA4 BAR f2f -> 8 February 2005 12 Further work Complete the basic prototype by end of February 05 Detail design Requirements traceability matrix –List numbered requirements and measurable tests for each of the requirement. Test plan - Unit and System Detailed description of deployment –Under various network configurations (scenarios) Task breakdown and assignment Build full prototype Any thing else ?