4:3 EclipseConFrance 2018 BEST-NG

CS – Communication & Systèmes / 1DESIGNER, INTEGRATOR, OPERATOR OF MISSION CRITICAL SYSTEMS uk.c-s.fr
ECLIPSE MODELING TECHNOLOGIES
PROPELLING THE NEW GENERATION
OF SPACE DATABASE EDITORS
PRESENTED BY: VINCENT HÉMERY
(ECLIPSE AND MODELING EXPERT)

CS – Communication & Systèmes / 2DESIGNER, INTEGRATOR, OPERATOR OF MISSION CRITICAL SYSTEMS uk.c-s.fr
BEST-NG

CS – Communication & Systèmes / 3/ 3
AGENDA
Project history
Technical design
Designing the generic model
Mapping the formats
Expressions editor
What’s next?

1
/ 4
PROJECT HISTORY
Project history
 Technical design
 Designing the generic model
 Mapping the formats
 Expressions editor
 What’s next?

PREDECESSOR: BEST
Beyond EAST
›https://logiciels.cnes.fr/content/best
Maintained for CNES and ESA
XIF format (with possible extensions)
›Monitoring & Control extension
Quite old technologies

BEST
Modeler
WHAT BEST DOES
Exchanged
data
Space
database
model
conforms to
Additional BEST Tools
Data generation, reading,
post-processing…
work with

WHAT BEST LOOKS LIKE

BEST-NG NEEDS
Bigger databases > 100 Mbytes
›Best : files < 20 Mbytes
Functional scope as large as BEST
›Unpluggable Monitoring & Control
Several formats
›Need to communicate in XIF, XTCE, and CADS
Better conception
›Expressions and references

ITERATIVE STEPS
May 2014
Preliminary
study
July 2014
– June 2015
First BEST-NG
implementation
September 2015
– nowadays
BEST-NG as we
know it
EMF or XSD
EMF &
CDO
Distributed
architecture
Multi-domain
Multi-format
MXIF

2
/ 10
TECHNICAL DESIGN
 Project history
Technical design
 What’s next?

MULTI-DOMAIN ISSUES
Bitstream structure as a tree
›XIF without extension
Space database
›Packets
›Monitoring
›…
Format specific information
Other mission-specific information
›Like XIF extensions

MULTI-DOMAIN SOLUTION
Classic DSL (Ecore)
›All concepts in 1 Ecore file
›No multi-domain elements
Profile approach
›Base model element
›Domain concepts as Stereotypes
›Stereotypes applied on base element
DSL Profile approach

UML PROFILES?
OMG standard
UML not related to domain
›Mapping issues
UML too Complex and too rich
›Model pollution
Implementation violates EMF good practices
›Legacy mode for CDO
›Some Modeling tech might not work
Not customizable

EMF PROFILES?
EMF Profiles
›Apply Stereotypes on any model element
 http://www.modelversioning.org/indexd7a8.html?option=com
_content&view=article&id=69&Itemid=99
Conferences in 2011–2012
Not reliable and … dead
« Metalevel Lifting by Inheritance »
›Problems with CDO…

OUR OWN PROFILE SOLUTION!
Base metamodel: KISS
Domain concepts as Profiles
Format-specificities as Profiles
EMF good practices
Patch all you want
By the way… shamelessly mimic UML

MULTI-FORMAT ISSUES
Different formats
›Different classes
›Different properties
Similar concepts
1 model element: Two-Face
Complex correspondances
›Different logics
http://dc.wikia.com/wiki/File:Batman_and_Robin_Vol_2_23.1_Two_Face_Textless.jpg

MULTI-FORMAT SOLUTION
EMF Facet
›https://www.eclipse.org/facet/
Use Facets to map DSL elements
Java-implemented queries

DEMO

3
/ 19
DESIGNING
THE GENERIC MODEL
 Project history
Designing the generic model
 What’s next?

FORMATS

PROFILES AND FACETS

GENERIC MODEL

PROFILE EDITOR

PROFILE EDITOR
Provides validation
›Methodology
›Anti-patterns
Useful decorations and actions
Acceleo queries view
Made with Eclipse Sirius

AND LOTS OF EXPERTISE…
Modeling expertise
Domain expertise
›CNES + Development team
›Numerous meetings
What makes sense in the Generic Model?
What is the best usage?
›E.g. nature & unit on physical type

4
/ 26
MAPPING THE FORMATS
 Project history
Mapping the formats
 What’s next?

FORMATS

FORMAT MAPPING
DSL Profile
Extend the correct base element
Add Facet
›Applies on generic model
Move derived information to Facet
Get rid of syntactic sugar
… implement import/export particularities

5
/ 29
EXPRESSIONS EDITOR
 Project history
Expressions editor
 What’s next?

EXPRESSION EDITOR

EXPRESSION EDITOR
Xtext is great 
Grammar and semantic
Actual model with references
On a model subset
›Virtual resource
›Tooling for context retrieval

GRAMMARS
Grammar inheritance
Format-specific grammars
›For transformation
›When not translatable
Generic
Expressions
Structured
Data
Expressions
SpaceMC
Expressions

GRAMMARS AND PROFILES
Weak coupling Profile Grammar
Profile Grammar
›Interface
›Stereotype constraint with Grammar ID
Grammar Profile
›Reference base element
›Keywords and services

6
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WHAT’S NEXT?
 Project history
What’s next?

WHAT’S NEXT?
A real HMI
›Minimal HMI effort in the prototype
›JavaFX Eclipse 4 experiments with lazy loading
A better Name
›
Renewing the whole space database
management tools suite
›Based on BEST-NG
›Using Eclipse Modeling technologies

CONCLUSION
Merge different visions
Represent different domains
Performance
Domain expertise required
Eclipse modeling technologies
Transformation is a tedious task
›But maintenance should be reduced

LEAVE FEEDBACK

CS – Communication & Systèmes / 38
CS
22, avenue Galilée -
92350 Le Plessis Robinson – France
Tel.: +33 (0)1 41 28 40 00
uk.c-s.fr
DESIGNER, INTEGRATOR, OPERATOR OF MISSION CRITICAL SYSTEMS uk.c-s.fr
Thanks for listening
Vincent Hémery
Eclipse and Modeling Expert
Space: Payload Data & Applications
5 rue Brindejonc des Moulinais -
31500 Toulouse – France
Tel.: +33 (0) 561 176 310
E-mail: vincent.hemery@c-s.fr

4:3 EclipseConFrance 2018 BEST-NG

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