jsoe research expo 2012

1. Rich Service Model
Policies
Policy
Evaluator
Requestor Fulfiller
Generic Workflow
Requestor
Fulfiller
Alternate
Fulfiller
1
2
1
4
2 3
2'
3'
Policy Evaluator
(injected at
runtime) If User in Researchers
then Fulfiller
else AlternateFulfiller
Policies
Policy
Evaluator
Requestor Fulfiller
Generic Workflow
Requestor
Fulfiller
Alternate
Fulfiller
1
3
1
2
5
4'
5'Policy Evaluator
returns service to
execute
Router
2
4 36
4Router
If User in Researchers
then [Fulfiller]
else [AlternateFulfiller]
Policy-driven Development
Just-In-Time Workflow Composition
Barry Demchak (bdemchak@ucsd.edu) & Ingolf Krüger
California Institute for Telecommunications and Information Technology, San Diego Division
Context
Cyberinfrastructure (CI)† †
• 100s of stakeholders (e.g., producers,
consumers, operators, etc.)
• Stakeholders opt in only when CI
satisfies their requirements
• CIs have long delivery times
Solution
Policy
• Injected at specific workflow location
• Decision expressed in Domain-
Specific Language (DSL1)
• Provides alternate workflow(s)
Results
Benefits
• Rapid requirement realization
(on live system)
• Enable stakeholders to articulate
requirements as policies
• Enable complex/compound policies
Future Work
• Policy authoring system2,3
• Verify completeness/correctness4
using CPN Tools5
• Maintain system consistency
• Secure policy deployment
This material is based upon work supported by the National Institutes of Health
Under Grant Nos 1U01CA130771-01 (Project PALMS: Kevin Patrick, PI) and U54 HL108460
f
† †Cyberinfrastructures (CI)
f
f
†PALMS References
Physical Activity Location Measurement System to understand where activity-related energy expenditure occurs in
humans as a function of time and space. Harvests data from wearable devices on small and large scales, provides
framework for research and analysis, and has ultimate goal of discovering methods for engineering better health.
An Internet-based research computing environment that supports data acquisition, data storage, data management, data
integration, data mining, data visualization, and other computing and information processing services. Different
stakeholders produce, consume, manage, and govern a CI, and their requirements must be simultaneously met or else
the integrity of the CI degrades.
1. M. Fowler. Domain-Specific Languages. Boston, MA: Addison-Wesley, Pearson Education, Inc. Sept 2010.
2. T. Lodderstedt, D. Basin, and J. Doser. SecureUML: A UML-Based Modeling Language for Model-Driven Security. Proceedings of the
5th International Conference on The Unified Modeling Language. pp426-441. Springer Verlag, 2002.
3. A. Bhattacharjee and R. Shyamasundar. Activity Diagrams: A Formal Framework to Model Business Processes and Code Generation.
Journal of Object Technology. Vol 8, No 1, Jan 2009.
4. J. Juerjens. Security Systems Development with UML. Springer-Verlag Berlin Heidelberg, 2003.
5. K. Jensen and L. Kristensen. Coloured Petri Nets: Modeling and Validation of Concurrent Systems. Berlin: Springer-Verlag. 2009.
6. M. Arrott, B. Demchak, V. Ermagan, C. Farcas, E. Farcas, I. H. Krüger, and M. Menarini. Rich Services: The Integration Piece of the
SOA Puzzle. In Proceedings of the IEEE International Conference on Web Services (ICWS), Salt Lake City, Utah, USA. IEEE, Jul.
2007, pp. 176-183.
Sensor Data
Techniques
Service Oriented Architecture-
based execution & deployment
• Leverage standard patterns5:
strategy, messaging, routing, &
composite pattern
• Leverage role-based interaction,
choreography & interceptor
techniques
• High availability, reliable, scalable
Model-driven engineering
• Refinement follows Rich Service6
decomposition & logical/deployment
transformation
• Composition based on Systems-of-
Systems principles
PALMS† Case Study
Data Storage Calculations Visualization
Overall Requirements
Problem
More stakeholders 
requirements churn 
even longer delivery times 
unhappy stakeholders
∴ lower likelihood CI will satisfy
community requirements
Insight
Compose new workflows onto
existing workflows at runtime
• Access control, data stream filtering
• Feature addition/deletion
Conceptual