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DEVS-Based Simulation Web Services for Net-Centric T&E

DEVS-Based Simulation Web Services for Net-Centric T&E. Saurabh Mittal, Ph.D. Jose L. Risco-Martin*, Ph.D. Bernard P. Zeigler, Ph.D. Arizona Center for Integrative M&S, Univ. of Arizona *Departamneto de Arquitectura de Computadors y Automatica, Madrid, Spain. Outline.

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DEVS-Based Simulation Web Services for Net-Centric T&E

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  1. DEVS-Based Simulation Web Services for Net-Centric T&E Saurabh Mittal, Ph.D. Jose L. Risco-Martin*, Ph.D. Bernard P. Zeigler, Ph.D. Arizona Center for Integrative M&S, Univ. of Arizona *Departamneto de Arquitectura de Computadors y Automatica, Madrid, Spain

  2. Outline • Need for Net-centric M&S paradigm • Position of DEVS in addressing capabilities • Components of Net-centric M&S • Underlying technologies • DEVS, XML, Web Services, DEVSML • Distributed simulation using SOADEVS • SOADEVS Client • Demonstration • Conclusions and Future work

  3. Need for Net-centric M&S Paradigm • Acute need for a new testing paradigm that could provide answers to several challenges in a 3-tier structure • Tier 1: individual systems or programs • Tier 2: SoSs in which interoperability is critical • Tier 3: Enterprise level, where joint and collaborative operations are conducted • The paradigm has to comply with Department of Defense Architecture Framework (DoDAF). • Unfortunately, DoDAF and other DoD net-centric mandates post significant challenges to current testing and evaluation tools

  4. State of DEVS Technology

  5. Components of Net-Centric M&S • Every web-based simulation consists of: • The Application • Model Partitioner • Model Deployer • Model Initializer • Model Simulator • Many examples exist that implement above steps but in different manner: • DEVS/P2P, DEVS/RMI, DEVS/CORBA • Most are focused towards simulation engine • Our effort is more oriented towards application layers i.e. the modeling application itself

  6. Underlying Technologies • DEVS • Based on mathematical formalism using system theoretic principles • Separation of Model, Simulator and Experimental Frame • Atomic and Coupled types • Hierarchical design • Web Services using XML • Service Oriented Architecture (SOA) consists of various W3C standards • Machine-to-machine interoperable interaction over the network based on WSDL interface descriptions • Client server framework • Message encapsulated in SOAP wrapper which is in XML

  7. Underlying Technologies …contd’ • DEVSML • Built on JavaML, which is XML representation of Java • Behavior representation takes its power from underlying JavaML

  8. DEVSML and SOADEVS

  9. Distributed Simulation using SOADEVS • Fundamental Objective: Integrate software application as services • Two layer service framework • User layer • Upload, Compile, Simulate (centralized or distributed) • Engine layer • Initialize, DEVS-protocol relation services, exit, console output retrieval service • Engine Layer: • Initialize simulator i • Run Transition in simulator i • Run Lamda function in simulator i • Inject message to simulator i • Get tN from simulator i • Get ta from simulator i • Get consoleLog from all simulators • Finalize simulation service

  10. Distributed Simulation using SOADEVS … contd’

  11. Distributed Simulation using SOADEVS … contd’ • Abstraction of Coupled Model with an Atomic Model having DEVS State Machine

  12. Distributed Simulation using SOADEVS … contd’ • Centralized Simulation

  13. Distributed Simulation using SOADEVS … contd’ • Real-time Distributed Simulation • Involves direct coupling with machines

  14. SOADEVS Client

  15. A Demonstration DEVS Unified Process and SOADEVS

  16. Conclusions • A SOA-oriented framework called SOADEVS for test and evaluation of DEVS models • Centralized and Distributed executions • Modified real-time DEVS simulation protocol to be tailored for SOA • Layered service architecture with underlying helper services • Part of the larger DEVS Unified Process (DUNIP) • Communication using XML as middleware • A means towards an end

  17. Future Work • Net-ready capability testing requirements • Execution of DEVS test-models in tandem with real web services over SOA • Multi-platform simulation capability • DEVSJAVA and DEVS/C++ together in a single simulation session interfaced using WSDL specifications of layered SOADEVS • Platform Specific Messages (PSMsg) translated to Platform Independent Messages (PIMsg) at run-time using DEVSML architecture

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