CSSE 490 Model-Based Software Engineering: More MBSD. Shawn Bohner Office: Moench Room F212 Phone: (812)
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1 CSSE 490 Model-Based Software Engineering: More MBSD Shawn Bohner Office: Moench Room F212 Phone: (812)
2 Learning Outcomes: MBE Discipline Relate Model-Based Engineering as an engineering discipline. Software development More on transition from traditional to modelbased development Elements of MBSE MBSysE (if time) Q3
3 What are some of the most important models you use in developing software? How do they relate to each other? Think for a minute Turn to a neighbor and discuss it for a minute Q2
4 Software Lifecycle Activities...and their models Requirements Elicitation Analysis System Design Object Design Implementation Testing Expressed in Terms Of Structured By Realized By Implemented By Verified By Use Case Model Application Domain Objects Subsystems Solution Domain Objects class..." class..." class..." Source Code? class..."? Test Cases Q1
5 Status Quo of Development Integrated Development Environments (IDE) e.g., Eclipse Rationale Enterprise Edition Visual Studio Including Modeling tools e.g., UML (e.g., ArgoUML) Refactoring tools Design Pattern tools Agile Methods as a Silver Bullet Incrementally faster, with less risk May not play well with other disciplines (e.g. QA) Q2
6 Level of Automation: Past ~35 Years Programming IDEs (e.g. Eclipse, Rational, Visual Studio) Platfom independent model (PIM) Programming Language Higher level of expression Easier to understand Portable Standardized Platfom specific model (PSM) Compiler Engine Diverse HW/OS Platforms Dependable Flexible Configurable Optimizing Complete: Linker, Debugger, etc.
7 Levels of Automation: MBSE Architectural IDEs (e.g. ArcStyler) PIM Model (UML, ) & Modeling Style (J2EE,.NET, COBOL, ) Higher level of expression Easier to understand Portable Standardized Generator Projection PSM Translative Generator Engine Models to Code Models to Models Code for specific platforms, Refinement models,... Dependable Flexible Configurable Debuggable Optimizing Complete Q3, 4
8 Key Information Resides in Models System Models Object Model Forward Engineering Functional Model Dynamic Model class..." class..." class..." Code Reverse Engineering Constraints Tradeoffs Issues Pro Con Proposals Issue Model Org Chart PERT Chart Timeline Task Models
9 Model Clashes
10 MBSE Starting Point: Domain Domain engineering is the starting point in most cases Establish the key concepts, actors, objects, and interaction in the domain Determine what parts done by a computer, people, roles, mechanisms, Understand forces of change Establish basic vocabulary (later use in DSL) Q5
11 MBSE: Metamodel Starting with a clear structure of the domain (an ontology), establish the structure for introducing automation Metamodel captures the abstract syntax and the static semantics of a language Abstract syntax (unlike concrete syntax) merely states what the language structure looks like Static semantics determine the well-formedness (e.g., a rule that variables must be declared) Q6
12 Domain Specific Language Specialized to a domain e.g., telecommunications or telephony billing Makes a domain s aspects formally expressible and model able Model will sometimes be used synonymously with DSL
13 Formal Models Starting point for automated transformations Formal model needs a DSL Mappings Transformations Always based on metamodel Model to model Model to platform Q7
14 MBSE: Platform Target of the system System Hardware Communications Operating System Language Database Graphical User Interface etc. MacOS Windows Unix
15 MBSE: Car Sharing Example Domain Modeling A B UMTS Server Web Server Web Service A B Model Transformation <<EJBArchive>> secureibank Domain Object Models Use Cases... Deployable Components Build & test environment...
16 This is a model Can you develop it? Think for a minute Turn to a neighbor and discuss it for a minute
17 Model-Based System Engineering (according to Software Engineering Institute) Architecture Modeling & Analysis ABS NAV ETC ABS NAV ABS ETC Requirements Analysis ETC System Integration Rapid Integration Predictable Operation Upgradeability Reduced Cost Predictive Analysis Early In & Throughout Life Cycle
18 A Control Engineer Perspective K K 2 s Continuous feedback in a controller Tune parameters Component Analysis with Text_IO; package Main is Simulink with Text_IO; package Main is Matlab application Code begin type real is digits 14; type flag is boolean; begin type real is digits 14; type flag is boolean; x : real := 0.0; ready : flag := TRUE; x : real := 0.0; ready : flag := TRUE; Continuous feedback for a control engineer
19 Software System Engineer Perspective Continuous feedback by Comparing analysis results with actual results with Text_IO; package Main is begin with Text_IO; package Main is begin type real is digits 14; type real is digits 14; type flag is boolean; type flag is boolean; x : real := 0.0; x : real := 0.0; ready : flag := TRUE; ready : flag := TRUE; Application Components Execution Platform Arch. Tools AADL Runtime Timing analysis Reliability analysis Refine properties package Dispatcher is A.p1 := B.p2; Case 10ms: dispatch(a); dispatch(b); T1 T2 T3 T R1 6 R2 R3 R T1 T2 T3 T4 T1 T2 T3 T Runtime Data R1 R2 R3 R Architecture Model
20 A Combined Perspective K 1 + Matlab - K 2 s Continuous interaction between Control engineer & system engineer Tune parameters Component Analysis Application Code with Text_IO; package Main is begin type real is digits 14; type flag is boolean; x : real := 0.0; ready : flag := TRUE; Simulink with Text_IO; package Main is begin type real is digits 14; type flag is boolean; x : real := 0.0; ready : flag := TRUE; Arch. Tools AADL Runtime Architecture Models Timing analysis Reliability analysis Refine properties package Dispatcher is A.p1 := B.p2; Case 10ms: dispatch(a); dispatch(b); T1 T2 T3 T R1 6 R2 R3 R T1 T2 T3 T4 T1 T2 T3 T Runtime Data R1 R2 R3 R
21 Homework and Milestone Reminders Continue to Read Chapter 4 of MBSD Text Concept Formulation Let s talk tomorrow about representation forms
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