Model Design using Hierarchical Web-Based LibrariesModel Design using Hierarchical Web-Based Libraries

F. Bernardi

Pr. J.F. Santucci

{bernardi, santucci}@univ-corse.fr

University of CorsicaUniversity of CorsicaSPE LaboratorySPE LaboratoryUMR CNRS 6134UMR CNRS 6134

Studied ProblemStudied Problem

Objective of this work: to build a generic models library

Interests: Reusability of models seen as modeling components Ease of new models building Ease of new models validation

Main Requirements: Ease of use Inheritance between models management Abstraction Hierarchy between models management Remote access capacity

SummarySummary

Basic Notions of M&S

Basics of the Models Library

Web-Based Architecture

Screenshots

Conclusion and Perspectives

SummarySummary

Basic Notions of M&S

Basics of the Models Library

Web-Based Architecture

Screenshots

Conclusion and Perspectives

Basic Notions of M&SBasic Notions of M&S

Three complementary concepts

1. The Multi-Views concept: Allows a gradual complexity introduction Each model of these views represents a

particular part of the global system

Structural view, behavioral view, system view,…

2. The description hierarchy Allows a recursive subsystems hiding

Basic Notions of M&SBasic Notions of M&S

3. The abstraction hierarchy General problem for modeling: choosing a

good level of details Abstraction level:

Determines the amount of informations contained in a model

Allows taking efficiently into account the relevant informations

Basic Notions of M&SBasic Notions of M&S

The abstraction hierarchy

SummarySummary

Basic Notions of M&S

Basics of the Models Library

Web-Based Architecture

Screenshots

Conclusion and Perspectives

Basics of the Models LibraryBasics of the Models Library

Software Component: Software object presenting well-defined

interfaces Can be personified Reusable in different contexts

Modeling Component: Software component Can be described following different

abstraction levels Can be « context-in » or « context-out »

Basics of the Models LibraryBasics of the Models Library

Context-in and Context-out models notions: Context-out model:

Abstraction of a modelPresents a structure allowing it to be stored

in a library Context-in model:

Context-out model extracted from its libraryDirectly reusable in the environment

Basics of the Models LibraryBasics of the Models Library

Models Library: Object-Oriented architecture allowing to store and retrieve persistent context-out models

Structuration mainly based on two paradigms: Application domains Inheritance hierarchy

Provides the abstraction hierarchy management

Basics of the Models LibraryBasics of the Models Library

Core of the architecture: The Storage Engine Build on the model of an Object-Oriented

Database Management System Uses XML to describe and store models Modular and extensible: based on the notion

of service Can use six different element types

Basics of the Models LibraryBasics of the Models Library

Six elements able to be stored: Library: root object Domains: DEVS Simulation, VHDL Descriptions,… Application Domains: Science part of the models Classification Intermediate Models (CIM): allow a

classification hierarchy between models Inheritance Intermediate Models (IIM): storage object

allowing the share of properties Model File: storage object (context-out model)

Basics of the Models LibraryBasics of the Models Library

UML Diagram: Links Between Elements

Domain Application Domain

Classification Intermediate Model

Model File

Inheritance Intermediate Model

Library

0..1

*

*

0..1

*

contains

0..1

0..1

*

0..1

*

*0..1

0..1 *

0..1

*

*

0..1

0..1

*

Basics of the Models LibraryBasics of the Models Library

Service: set of functions for the structuring, the management or the maintenance of a library

Five Main Services: Name Service Classification Service Abstraction Hierarchy Service Inheritance Service Persistence Service

Basics of the Models LibraryBasics of the Models Library

Abstraction Service: Based on an Abstraction Matrix Manage relative abstraction levels between

context-out models

Inheritance Service Not performed directly on context-in models Applied on context-out models Performed through XML tags

Context-in Model

Context-out Model

XMLTransitionProcedure

JDEVSSourceCode

XML

Context-inModel

Context-outModel

XMLReconstitution

Procedure

JDEVSSourceCode

XML

XML-based Persistence Service Context-in to context-out

Basics of the Models LibraryBasics of the Models Library

Context-out to context-in

SummarySummary

Basic Notions of M&S

Basics of the Models Library

Web-Based Architecture

Screenshots

Conclusion and Perspectives

Web-Based ArchitectureWeb-Based Architecture

Set of tools allowing a design team to work on the same models stored on a server

Basic idea: two possibilities offered for accessing the storage engine: Using a Web browser Directly from the M&S environment

Web BrowserWeb Browser

Modeling and SimulationModeling and Simulation

EnvironmentEnvironment

NetworkNetwork

NetworkNetwork Storage EngineStorage Engine

ServerServer

Storage EngineStorage Engine

ServerServer

Application ServerApplication Server

Application ServerApplication Server

Web-Based ArchitectureWeb-Based Architecture

First possibility: simple management, documentation and/or consultation

Second possibility: uses APIs for the M&S environment

Web-Based ArchitectureWeb-Based Architecture

Implementation: Servlets/Applets/Java Web Start

Technological Choices: Servlets:

Persistents Fasts Platform-independents Extensible

Applets: Very well known Ease of use

Java Web Start: Fast Always up to date

SummarySummary

Basic Notions of M&S

Basics of the Models Library

Web-Based Architecture

Screenshots

Conclusion and Perspectives

ScreenshotsScreenshots

ScreenshotsScreenshots

SummarySummary

Basic notions of M&S

Basics of the Models Library

Web-Based Architecture

Screenshots

Conclusion and Perspectives

Conclusion and PerspectivesConclusion and Perspectives

Main Points and Originalities: Inheritance Links Abstraction Links Traduction of DEVS models in XML

Validation using the JDEVS environment: Environmental Studies CORBA Architecture Study

Perspectives: Management of other modeling formalisms Improvement of the performances of the

storage engine Study of the distribution of storage engines

on a network