ECDL 2006 - DLSci06 - DILIGENT grid-based DL

Leonardo Candela, Donatella Castelli, Christoph Langguth, Pasquale Pagano, Heiko Schuldt, Manuele Simi and Laura Voicu
On-Demand Service Deployment and Process Support in e-Science DLs: the DILIGENT Experience

http://www.diligentproject.org/

(Also see notes from tutorial Distributed Infrastructures for Digital Libraries.)

Motivation

* research is multidisciplinary and co-operative effort
* may use a virtual resource organization that doesn't last a long time or have DL expertise
* but the DL is an important tool

DELOS view: from DL to Knowledge Commons
* from content-centric to person-centric
* from info storage to communication and collaboration support
* from centrally-located text to distributed and heterogenous data sources

New DL development model
* DL built by dynamically aggregating the needed resources
* new functionality combined in user-defined workflows

Service-Oriented Architecture over Grid Framework

[complex diagram]

* New functionality delivered by workflows of services

Services Overview

* Mediation
* Information Space Management
* Access
* User and Resource Management
* Presentation
  - user-oriented access point to the DL
  - plug and play community-specific tools
  - [something about JSR168 portlets and other stuff]
* Enabling
  - monitoring, other operations domain functions

Service Detail

* the Keeper Service
  - deploy and monitor user-defined virtual DLs

* the Information Service
  - gathers, stores and supplies information about the resources constituting DILIGENT
    and needed to the other services
  - XML-based resource profiles
  - push and pull modalities i.e. query and subscribe/notify

Process Design and Validation

Implement complex services by combining existing ones, a.k.a. "programming in the large"
* control flow
* data flow
* transaction behavior and execution guartees for concurrency and failure handling
* XML, SOAP and WSDL as technologies
* BPEL as a foundation for process specification

[diagram of tool]

Process Execution

* built on top of OSIRIS
* runs BPEL tasks?