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ECHO Services Discussion

ECHO Services Discussion. WGISS 18 September 6-10, 2004 Beijing, Peoples Republic of China Robin Pfister NASA/GSFC. ECHO Overview Native Services. Metadata Clearinghouse (Registry)

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ECHO Services Discussion

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  1. ECHO Services Discussion WGISS 18 September 6-10, 2004 Beijing, Peoples Republic of China Robin Pfister NASA/GSFC

  2. ECHO OverviewNative Services • Metadata Clearinghouse (Registry) • ECHO makes the data holdings of the Earth Science Enterprise available to clients as if they had a copy of all the metadata in their system • Order Broker • ECHO provides a single interface for clients to place orders through and deals with the complexity of ordering from its partner systems on behalf of the client • User Account Management • While not a primary feature of the system, ECHO provides flexible user account management for both registered users and providers in support of its registry and brokering roles • Service Registry • ECHO provides a mechanism for clients to find out what Earth Science services are available dynamically. ECHO provides the mechanism for services to express their relationship to Earth Science data • Service Broker • ECHO will allow a client to order data from a data provider and then have a series of services applied to it by relying on ECHO to do the coordination • Open Source: http://opensource.arc.nasa.gov/

  3. The Big Picture • Enabling Technology • Middleware, not GUIs • Marketplace • Providers offer their wares • Consumers find what they like and access it • Interoperable Registries • Data • Metadata Catalog/Clearinghouse • Inventory Level • Services • Service Registry • Web Services Technology • Service User Interfaces (UIs) • Interoperable Through Registry Taxonomies

  4. ECHO in the Enterprise Clients Enterprise Middleware … … ECHO Service Registry ECHO Data Registry Archive Data Acquisition Delivery/ Fulfillment DataProcessing

  5. Definition and Usage • Service - A capability offered by a provider. • By participating in ECHO, the service’s interface is declared using standard semantics and technology (WSDL, SOAP) in a way that potential users can find, understand and access. • Types of Services - Advertised, Brokered, Chained

  6. <<SOAP>> <<WSDL>> <<UDDI Query>> <<UDDI>> Service MiddlewareUses a Service Oriented Architecture (SOA)

  7. Service Capability Status • Advertised services - operational • Service Brokering - initial studies in progress; prototyping to begin soon. • Service Chaining - will follow brokering.

  8. Service Brokering

  9. Ultimate Goal is Service Chaining: A Distributed Virtual Computer

  10. Potential Topics for Follow-up Services Presentation in February • Brokering Issues and Solutions • Service Chaining Model • Classification of Services in the Enterprise • Incl. What do we do when it evolves (issues related to change) • Federating these registries

  11. Other Items of Interest…

  12. ECHO Data Partner Status Totals (public/restricted): 1,131 / 176 3,106,784 / 716,308 27,921,105 / 3,546,534

  13. OGC-ECHO Adaptor • The OGC-ECHO Adaptor (OEA) will provide a mechanism to present ECHO holdings in an OGC-compliant fashion. • It will service Z39.50 GEO profile catalog requests • The Earth Science Gateway Portal (Geospatial One-Stop) is the client that is driving this development. • The OEA will comply with version 1 of the OGC Catalog Services Specification (http://www.opengis.org/docs/02-087r3.pdf).

  14. System Interoperability • As we move to ECHO, the EOS Data Gateway is also being modified to interoperate via ECHO. • For distributed searching we were hoping to move into current technology by replacing the V0 interoperability mechanism with an OGC standards based mechanism. • We’d like feedback from those who are currently interoperable if moving to OGC interoperability standards is okay. • Please send e-mail with responses, and also concerns and discussions. robin.g.pfister@nasa.gov

  15. Thank you

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