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An Introduction to Globus Toolkit® 3

-Developing Interoperable Grid services

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Outline

• Cornerstones• New Concepts• Software Stack• Core• Higher Level Services• Developing and Using Grid Services• Development and Runtime Environment• Admin Notes• Demo• Learning More

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Cornerstones

• Common Protocol Framwork• Core beyond Portability/IO code• Implement Common Service Behaviour Once• Promote Open Grid Standards and Alternative

Implementations• Proof-of-concept for Emerging Distributed Computing

Standards• Marriage between Web services and Grid services• Multi-language Support• SDK and RTE for Grids• Use of off-the-shelf development tools and APIs• Elaborate Extensibility Frameworks to Promote Customization

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New Concepts

• Full implementation of OGSI v 1.0 GridService Factory ObjectGroup Notification HandleResolver

• WSDL and XML Schema Langugage Agnostic Interfaces -> Binding Generation

• Container Model Runtime Environment implements System Level Services

• Java Technology Focus Server Technologies (Servlet, EJB) APIs (JAX-RPC, JAXP)

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Software Stack

Core (OGSI)

Higher Level Services

Security (WS-Security)

User Services

Web Service Engine (JAX-RPC)

Language Runtime APIs (JDK)

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Core

• Implementation of all OGSI interfaces and their required service data

• Client and Server Side Programming Models• WSDL and XML Schema for all standard interfaces• Service Data Framework• OperationProviders• Handle Resolution• Extensibility API• Standard Factory Implementation• State Management

(Activation/Deactivation/Loading/Saving)• Security APIs, deployment descriptor

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Higher Level Services

• Managed Job Service GRAM mapped to OGSI

• Index Service MDS mapped to OGSI LDAP -> XML Database

• Reliable File Transfer Service 3rd party file transfer services using GridFTP

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Managed Job Service

Master Managed Job Factory Service

Managed Job Factrory Service

Managed Job Service

Virtual Hosting Environment

Local/User Hosting Environment

*create()

**start()**sign payload with private key using XML Signature

**delegate credentials using WS Secure Conversation (encrypt or sign payload)

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Developing and Using Grid services

• Writing a Client1) Obtain WSDL from service2) Run WSDL->Java Stub Generator3) Obtain Service Handle4) Resolve Handle to Reference5) Invoke Service

• Writing a Service1) Write WSDL Port Type interface2) Generate WSDL Binding3) Run WSDL->Java Stub Generator4) Implement Service as subtype of GridService or

OperationProvider5) Write Deployment Descriptor6) Deploy/Run/Test

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Development and Runtime Environment

• Ant Build system• WSDL to Java Generators• Java to WSDL Generators• Samples, Programmer’s Guide and Tutorial• Demo GUI• Tomcat and Standalone Servers• Deployment Tools• Packaging Tools• Test Framework (Junit based)

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Admin Notes

• Packaging System based on GPT like in GT2• Java components deployed using industry standards

Enterprise Archives (EAR), Web Archives (WAR), Grid Archives (GAR)

• GAR contains: jar files of service, deployment descriptor, (G)WSDL schema, documentation, misc. configuration files

• Typically Factories and other Persistent Services are deployed with command line tools. Transient Services are deployed at runtime

• Core bundle base installation for all other packages, which are deployed/undeployed into core container

• Tomcat/Standalone containers supported out-of-the-box. Experimental support for JBOSS, IBM WebSphere

• See on-line admin guide for latest info: http://www-unix.globus.org/toolkit/3.0/ogsa/docs/admin/

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Demo

• Webstart Installation• Service Browser Framework

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Learning More

• White Paper• Admin Guide• User’s Guide• Programmer’s Guide• Security Architecture/Guide• Information Services• Managed Job Service• Reliable File Transfer Service

All available at: http://www-unix.globus.org/toolkit/documentation.html