1. VORB Virtual Object Ring Buffers
ROADNet Project
Arcot Rajasekar

2. Motivation How can I acquire my RT data?
How can I discover/access my RT data?
How can I share/integrate the data?
Can I integrate dynamically?
Can I share with other disciplines?
Can I integrate seamlessly with data from other disciplines
Can I integrate wth static data?

3. Realtime Data Acqusition Requirements
Data Acquisition
Data Communications
Data and Information Buffering
Data and Information Flow
Automated Data Processing
Automated Data and Information Archiving
Real-Time Data and Information Integration, Distribution and Sharing
Real-Time System Monitoring and Control
Real-Time Graphical User Interfaces

4. VORB Aims Requirements Virtualized Access to Real Time Data Streams
Virtualized Integration of Real Time Data
Multiple VORBs
Private Virtual Real Time Data Management
Private VORBs
Rapidly Configurable RT Data Networks
Demand-driven Reconfigurable VORB
Requirements
Federated Resource Brokering
Metadata Catalog
Rule-driven Data Aquisition and Integration
Extensible ORBs

5. What is VORB? VORB = ORB + SRB ORB: Object Ring Buffer
SRB: Storage Resource Broker

6. Object Ring Buffer
A server-client approach for managing the ring buffer (server is orbserver)
Multiple simultaneous read and/or write clients
Clients can be anywhere that is network reachable
Data packets may be of any size, format, information content (all within the same ORB)
Highly robust and error-free

7. Antelope Real-Time System

8. Seismic Information System

9. IGPP Real-Time Systems
ANZA Seismic Network (1981-present)
13 Broadband Stations
3 Borehole Strong Motion Arrays
5 Infrasound Stations
1 Bridge Monitoring System
Kyrgyz Seismic Network (1991-present)
10 Broadband Stations
IRIS PASSCAL Transportable Array (1997-Present)
Broadband and Short Period Stations
IDA Global Seismic Network (~1990 -Present)
38 Broadband Stations

10. SRB SDSC Storage Resource Broker & Meta-data Catalog Archives
HPSS, ADSM,
UniTree, DMF
Databases
DB2, Oracle,
Sybase
File Systems
Unix, NT,
Mac OSX
Application
C, C++,
Linux I/O
Unix
Shell
Dublin
Core
Resource,
User
Defined
Meta-data
Remote
Proxies
DataCutter
Third-party
copy
Java, NT
Browsers
Web
Prolog
Predicate
MCAT
HRM 18

11. Virtual Data Grid (SRB)
Features SRB
Resource Transparency
Local or Remote, Resource Type & Access Method
Location Transparency
Path Names, Schemas, Containers
Cross-Domain Authentication
Rich Access Control
User Transparency
Uniform User Name Space
Uniform Data Name Space
Segmented & Replicated Data Management
Data Discovery
User-defined Metadata
Virtual Data Grid (SRB)
MCAT
Duke
UCLA
NCMIR
CalTech SDSC

12. SRB Projects Digital Libraries NASA Information Power Grid
UCB, Umich, UCSB, Stanford,CDL
NSF NSDL - UCAR / DLESE
NASA Information Power Grid
DOE ASCI Data Visualization Corridor
Astronomy
National Virtual Observatory
2MASS Project (2 Micron All Sky Survey)
Particle Physics
Particle Physics Data Grid (DOE)
GriPhyN
SLAC Synchrotron Data Repository
Medicine
Digital Embryo (NLM)
Earth Systems Sciences
ESIPS
LTER
Persistent Archives
NARA
LOC
Neuro Science & Molecular Science
TeleScience/NCMIR, Brain Images, BIRN
SLAC, AfCS, …

13. VORB- A Real Time DataGrid Architecture
Aim #1:
Virtualized Access to Real Time Data Streams
Hide Physical Aspects of RTD Resources
Handling Heterogeneity of Resources
Plug and Play
Uniform Protocol & API
Common Authentication & Authorization
Replication, Fault Tolerance, Load Distribution
Caching, Scheduling, Data Placement
Uniform Name Space – Persistence & Discovery

14. Federated VORB Aim #2: Virtualized Integration of Real Time Data
Integrate packets from multiple data streams
Heterogeneous & Distributed RT Data Resources
Hide Logical Aspects of VORB-accessed Resources
Virtualized Schema
Rule-based Integration
Uniform Protocols & API
Metadata-based Discovery

15. MyVORB Architecture Aim #3: Private Virtual Real Time Data Management
Configurable Integration
Information Discovery
Programmable Methods and Active Rules

16. Demand VORB Aim #4: Rapidly Configurable RT Data Networks
Based on situation and demands
More sensors activated/brought online
Changing VORB Federation
Rapid Information Publication
Fault tolerance

17. VORB Components VORB Archive Event-Condition- Action Rules Cat
Rule Engine
SrcORB
Client/App.
virtual data transfer (ctrl msgs)
actual data transfer

18. VORB Active Rule Engine
Archive
SrcORB
Client/App.
ORB
VORB
Cat
SrcORB
Client/App.
VORB Rule Engine
Event-Condition-
Action Rules
SRC Events
USR Events
Condition
Evaluation

19. Summary and Outlook VORB use cases!
VORB requirements and specification
Design of event, condition, and action sublanguages for RT data
Design of rule evaluation algorithm
Implementation