1. Some Basics of Globus Web Services
Adarsh Patil

2. This is a body for designing standards for the Grid.
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.

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

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

5. Based on Service Oriented Architecture Clients are service Requestors
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

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 ?

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

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

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

10. Credits/Acknowledgements
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