MODELLING AND ANALYZING BASED ON AADL
OSATE VERSUS STOOD
Farhana Rahman, Carleton University
Yu Sun, University of Ottawa
OUTLINE

Introduction

Scenario & Background

Architecture Analysis & Design Language (AADL)

STOOD & OSATE

Experimental Design

Evaluation Criteria & Method

Test Cases

Comparison, Analysis & Solution

Conclusion
INTRODUCTION
XYZ SOFTWARE SYSTEM INC.
o Established in 2010
o A mid-sized start-up company
o Focus on the development of real-time embedded systems
time consuming & costly
Figure 1. XYZ Software System Inc.
INTRODUCTION
ARCHITECTURE ANALYSIS AND DESIGN LANGUAGE
(AADL)
AADL, as an international industry
standard, it
• supports multiple analyses
from a single architectural
model
• enables modeling and analysis
throughout the life cycle
• provides analysis of runtime
behavior such as availability,
Figure 2. Architectural Model
performance, and security.
INTRODUCTION
AADL REPRESENTATIONS
Figure 4. AADL Representations [1]
INTRODUCTION
AADL COMPONENTS
Figure 5. AADL Components [1]
INTRODUCTION
CANDIDATE TOOLS: OSATE & STOOD

OSATE (Open-source AADL Tool Environment) [2]

Developed by Software Engineering
Institute, Carnegie Mellon University

Eclipse based, full language, full AADL
XMI support

Integrated text and graphical editing with
TOPCASED

Figure 6. OSATE Plug-In Development for AADL
Analysis plug-ins
INTRODUCTION
CANDIDATE TOOLS: OSATE & STOOD

STOOD [3]

Commercial modelling tool developed by
Ellidiss Software

AADL-related features

Legacy Ada and C code import

Industry standards compliance, including
D0178B

Full UNIX/Windows interoperability

Provides state of the art real time software
development offering UML 2.0 with full
software modeling
EXPERIMENTAL DESIGN
EVALUATION CRITERIA
Essential / Critical
Criteria
• Modelling
• Models Verification and Basic Analysis
Important Criteria
• Easiness of Use
• More Support on Model Analyzing
• Technical Support
Desired Criteria
• Code and Documents Generation
• Low Entry-cost
EXPERIMENTAL DESIGN
ESSENTIAL / CRITICAL CRITERIA

Functional Features: Modelling
 Strong support for both the AADL standard textual and graphical notations
 Comply with the AADL syntax and semantics
 Model import/export
 Consistence between model and text

Functional Features: Models Verification and Basic Analysis
 Ability of fault detecting at early deigned phase
 Model statistic checking along with application
EXPERIMENTAL DESIGN
IMPORTANT CRITERIA

Easiness of Use

Installation and system requirement

Training Requirement

Interface

More Support on Model Analyzing

Schedulability analysis

Problem identification

Technical Support

Supporting documentation available, such as tutorials, examples, on-line
help, etc.
EXPERIMENTAL DESIGN
DESIRED CRITERIA

Code and Document Generation
Essential code and document generated from the system model

Low Entry-cost / Pricing
Lowest cost as possible
EXPERIMENTAL DESIGN
METHODOLOGY: NIH SCORING SYSTEM [4]
EXPERIMENTAL DESIGN
METHODOLOGY: SCORING SYSTEM
Category
No.
Criteria
Priority (Pi)
Score (Si)
Essential /
Critical
0
Modelling
1
1-9
1
Model Verification & Basic Analysis
1
1-9
2
Easiness of Use
2
1-9
3
More Support on Model Analyzing
2
1-9
4
Technical Support
2
1-9
5
Code & Document Generation
3
1-9
6
Low Entry-cost
3
1-9
Important
Desired
𝑇𝑜𝑡𝑎𝑙 𝑚𝑎𝑟𝑘 =
6
𝑖=0 𝑃𝑖
∗ 𝑆𝑖
EXPERIMENTAL DESIGN
METHODOLOGY: TEST CASES

Speed Control System
A simplification of an aeronautical, automotive, or other vehicle speed control
system. It includes a speed sensor that provides data to a controller. The
controller outputs a command to a throttle actuator.
sensor
data

command
data
Avionics System Models, SEI, Carnegie Mellon University [5]
Comparison, Analysis & Solution
COMPARISON: MODELLING (OSATE)
menu
textual design
tool bar
graphical
design
property
settings
object
model
Comparison, Analysis & Solution
COMPARISON: MODELLING (OSATE)
No specification alert
Comparison, Analysis & Solution
COMPARISON: MODELLING (STOOD)
menu
tool bar
graphical design
property
settings
textual design
Comparison, Analysis & Solution
COMPARISON: MODELLING (STOOD)
save changes
graphical design
only available ports shown
textual design
Comparison, Analysis & Solution
COMPARISON: MODELLING
OSATE
STOOD
Graphical & Textual Support


Comply with AADL Syntax &
Semantics


Model import/export


Consistency between model
and text

Automatically realize the
consistency between the
textual and graphical design

Cannot update the
graphical design
automatically after
changing the text
Mark
2
4
Comparison, Analysis & Solution
COMPARISON: MODEL VERIFICATION & BASIC ANALYSIS (OSATE)
Comparison, Analysis & Solution
COMPARISON: MODEL VERIFICATION & BASIC ANALYSIS (OSATE)
model
statistics
application
statistics
Comparison, Analysis & Solution
COMPARISON: MODEL VERIFICATION & BASIC ANALYSIS (STOOD)
different
checking
rules
Comparison, Analysis & Solution
COMPARISON: MODEL VERIFICATION & BASIC ANALYSIS (STOOD)
Comparison, Analysis & Solution
COMPARISON: MODEL VERIFICATION & BASIC ANALYSIS
OSATE
STOOD
Fault Detection at
Early Stage


Model Statistic
Checking


Mark
2
5
Comparison, Analysis & Solution
COMPARISON: EASINESS OF USE
OSATE
STOOD
Installation

Easy to install, but Java 5.0 or higher
and Eclipse 3.3 or higher required;
platform independent

Both the installation file for
Windows and Unix are offered with
instructions, easy to install.
Training

With a few background of AADL
language, one can build the illustrated
model within 1 day and analysis the
model within one week.

With a few background of AADL,
one can build the illustrated model
within 2 days and analysis the
model within 10 days.
Interface

Easier to switch between textual and
graphical view. A lot buttons are
offered on the tool bar, but some are
not quite often-used.

Simple interface, but it is not as
easy as OSATE concerning finding
certain functions or switching
between the code and diagrams.
Mark
3
5
Comparison, Analysis & Solution
COMPARISON: MORE SUPPORT ON MODEL ANALYZING (OSATE)
Comparison, Analysis & Solution
COMPARISON: MORE SUPPORT ON MODEL ANALYZING (STOOD)
Comparison, Analysis & Solution
COMPARISON: MORE SUPPORT ON MODEL ANALYZING
OSATE
STOOD
Schedulability
Analysis


Problem
Identification


Mark
2
5
Comparison, Analysis & Solution
COMPARISON: TECHNICAL SUPPORT
OSATE
STOOD
Manual

User manual offered together with
the eclipse platform

User manuals available with the
installation package
Tutorial

A complete tutorial for the previous
release with example available

Complete tutorial for STOOD 5.2,
which works well for STOOD 5.3
Example
Model

Several examples available online;
one detailed example with
instructions offered by SEI course

Examples available together with
the installation package.
Other
Resource

AADL community

Technical support from Ellidiss
Mark
3
1
Comparison, Analysis & Solution
COMPARISON: DOCUMENT & CODE GENERATION
OSATE
STOOD
Document
Generation

Document Generation not
supported.

Document auto generation
supported with the formation of
PDF, PS, Word, etc.
Code
Generation

Code generation not supported with
itself, but can be achieved using
Ocarina plug-in for Eclipse.

Can generate some basic C and
Ada code, but the code is not
completely functional and put
into use without modification.
Mark
7
3
Comparison, Analysis & Solution
COMPARISON: LOW ENTRY-COST
OSATE
STOOD
Price

Open source, free!

STOOD itself is a commercial tool.
Free trial version can be
downloaded, but it is limited to 10
hood without analysis support
offered with AADL Inspector.
Mark
1
6
Comparison, Analysis & Solution
ANALYSIS & SOLUTION
Category
Essential /
Critical
Important
Desired
Mark
No.
Criteria
Priority (Pi)
OSATE
STOOD
0
Modelling
1
2
4
1
Model Verification & Basic
Analysis
1
2
5
2
Easiness of Use
2
3
5
3
More Support on Model
Analyzing
2
2
5
4
Technical Support
2
3
1
5
Code & Document
Generation
3
7
3
6
Low Entry-cost
3
1
6
44
58
Conclusion
CONCLUSION
2
7 criteria
Test
Cases
NIH
Scoring &
Analysis
REFERENCES
[1] P. H. Feiler, D. P. Gluch and J. J. Hudak, "The Architecture Analysis & Design Language (AADL):
An Introduction“, Carnegie Mellon University, 2006.
[2] Carnegie Mellon University, "AADL | Tool Integrators |Toolsets | OSATE“, Carnegie Mellon
University, 2011. [Online].
Available: http://www.aadl.info/aadl/currentsite/tool/osate.html. [Accessed 2 2012].
[3] Ellidiss Software, "STOOD - Modeling Tools“, Ellidiss Software, 2012. [Online].
Available: http://www.ellidiss.com/stood.asp . [Accessed 2 2012].
[4] National Institute of Health, "Scoring System and Procedure“, Maryland, USA, 2008.
[5] Software Engineering Institute, "SAE AADL Example Models “, Carnegie Mellon University,
2011. [Online].
Available: http://www.aadl.info/aadl/currentsite/examplemodel.html. [Accessed 2 2012].
THANK YOU!