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Some Basics of Globus Web Services

Some Basics of Globus Web Services. Adarsh Patil http://www.adarshpatil.com/. GGF-Globus Grid Forum. GGF4 was formed on Feb 2002 Globus team and IBM proposed first OGSA specification to merge Globus and Web Services (globus 2.x to globus 3.x)

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Some Basics of Globus Web Services

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  1. Some Basicsof Globus Web Services Adarsh Patil http://www.adarshpatil.com/

  2. GGF-Globus Grid Forum • GGF4 was formed on Feb 2002 • Globus team and IBM proposed first OGSA specification to merge Globus and Web Services (globus 2.x to globus 3.x) • This is a body for designing standards for the Grid. http://www.adarshpatil.com/grid_tutorial.htm

  3. OGSI-Open Grid Service Implementation • It is an technical specification for the implementation of Grid Services as described in the OGSA specification • Globus Toolkit 3 and 4 are OGSA complaint and are Service Oriented Grid Systems • Grid services are transient and stateful. Due to heavy specifications in one and only OGSI (too many specification in OGSI) it does not fit in web services and xml protocols http://www.adarshpatil.com/grid_tutorial.htm

  4. WSRF-Web Service Resource Framework • Globus Alliance + IBM + HP --> introduced WSRF to solve this issue ( many implementations in specification of OGSI) • WSRF standard promises this effort http://www.adarshpatil.com/grid_tutorial.htm

  5. Web Services • Based on Service Oriented Architecture • Clients are service Requestors • Servers are service Providers • XML, http, SOAP, WSDL, UDDI, WS-Inspection language are used • Request, Publish, Registry http://www.adarshpatil.com/grid_tutorial.htm

  6. WSDL-Web Service Description Language • It’s a XML based specification • It is used to describe Web Service • It describes • What a service can do? • Where is its location? • How to invoke it ? http://www.adarshpatil.com/grid_tutorial.htm

  7. SOAP-Simple Object Access Protocol • It’s a communication protocol for clients and servers to exchange messages in XML format over http • It specifies rules, header, body(URI) • The message contains • SOAP envelope • SOAP schema • XML schema definition http://www.adarshpatil.com/grid_tutorial.htm

  8. UDDI-Universal Description, Discovery, and Integration • Service discovery and registration • Used to advertise services • Used to find appropriate services • Use to publish/obtain services • Provider, User, Registry - white pages, yellow pages , green pages http://www.adarshpatil.com/grid_tutorial.htm

  9. OGSA- Open Grid Service Architecture • Architecture to build service oriented Grid. • It is based on web services • It uses protocols such as xml, http • Concept of Grid Services was introduced in OGSA • It defines various aspect of Grid Service and interfaces that are needed. • OGSA-WG is the work group which works on the design of OGSA specification http://www.adarshpatil.com/grid_tutorial.htm

  10. Credits/Acknowledgements • http://www.globus.org • http://www.globusconsortium.com/ • http://www.globusworld.org/ • http://www.ggf.org/ Text Books • The Grid 2: Blueprint for a New Computing Infrastructure (The Morgan Kaufmann Series in Computer Architecture and Design) • The Grid : Core Technologies • Grid Computing: Making The Global Infrastructure a Reality http://www.adarshpatil.com/grid_tutorial.htm

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