Post on 19-Dec-2015
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Model Based Software Development- a pragmatic view
Mikkel LauritsenIntentia R&D A/S
mikkel.lauritsen@intentia.dk
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Introduction
Modeling
Model based software development
... in an ideal world: MDA
... in the real world: DSL’s
Demo
Summary and questions
Agenda
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The next 2 x 45 minutes will be
Pragmatic
Useful in ”the real world”
Focused on technology
Introduction
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$The business angle
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Hopefully you will get an idea about
What is model driven software development?
Why use it?
Other stuff includes
a bunch of acronyms
Introduction
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Who am I?
33 years old, MSc in computer science
Works as a software architect at Intentia R&D in Ballerup
Does model based J2EE e-Commerce applications for a living
Introduction
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Introduction
Modeling
Model based software development
... in an ideal world: MDA
... in the real world: DSL’s
Demo
Summary and questions
Agenda
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As defined by OMG:
Designing before coding
A model is an abstraction – it gives a high-level description of objects
Models are often graphical
You often have specialized tooling for modeling
Modeling
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Level 0 Information (data)
Product(”DVD Player”, 299.95)
Level 1 Model (metadata)
Record(”Product”, (Field(”name”, String), Field(”price”, Money))
Level 2 Metamodel (meta-metadata)
Class(”Record”, (Attr(”name”, String), Attr(”fields”, List<”Field”>))
Class(”Field”, […])
Level 3 Meta-metamodel
Hardwired
Modeling
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Introduction
Modeling
Model based software development
... in an ideal world: MDA
... in the real world: DSL’s
Demo
Summary and questions
Agenda
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What is software development?
Specification
Design
Coding
Testing
etc.
And processes to connect it all
Software development
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´The challenge: it’s too difficult
Coding
Time to write code
Total time
Program size
Time spent
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The natural extension of programming languages
High-level primitives
The model becomes the code
Model based software development
Model(program) Artifacts
Generator(compiler)
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Design = code
Reduced time consumption – lower cost.
Early validation – perhaps more in theory than in practice
Agility
Simplicity - avoid (some of) the complexity that always creeps into large software projects
Platform independence
Advantages of model based development
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Compared to component libraries, modeling and code generation gives you
Simplicity
Consistency checking
Portability
No need for AOP and other dirty tricks
Modeling vs. component libraries
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Introduction
Modeling
Model based software development
... in an ideal world: MDA
... in the real world: DSL’s
Demo
Summary and questions
Agenda
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MDA is defined by the Object Management Group, OMG
http://www.omg.org
Much theory, little practice
Modeling: Model Driven Architecture
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Not targeted at any specific kind of applications
The core concern: platform independency
Platform Independent Model describes business logic
Platform Specific Model describes mapping to underlying platform
From the PIM programs are generated using one or more PSM’s
Modeling: MDA
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Mix of multiple languages for separate domains
Not really useful
Modeling: Unified Modeling Language
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XML is a way of expressing metadata (structure) in textual data
<book>
<title>Effective XML</title>
<author>Elliotte Rusty Harold</author>
<price>31.49</price>
</book>
XML is really great because of
ubiquitous tooling
human readability
Modeling: (XMI and) XML
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Introduction
Modeling
Model based software development
... in an ideal world: MDA
... in the real world: DSL’s
Demo
Summary and questions
Agenda
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More specific metamodel and code generation than in MDA
DSL’s have primitives that somehow match a domain
… defined technically, functionality-wise or in other ways
Examples: see http://compose.labri.fr/documentation/dsl/
Modeling: Domain Specific Languages
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On top of the advantages of more generic modeling like UML
Better coverage
Consistency checking - at a high level
All in all:
SIMPLICITY
Advantages of DSL’s
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Handling of nonfunctional requirements like
Performance
Concurrency support
Security
DSL’s make it harder to shoot yourself in the foot
Advantages of DSL’s, continued
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Introduction
Modeling
Model based software development
... in an ideal world: MDA
... in the real world: DSL’s
Demo
Summary and questions
Agenda
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Demo
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Introduction
Modeling
Model based software development
... in an ideal world: MDA
... in the real world: DSL’s
Demo
Summary and questions
Agenda
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Model based software development: generate code from model
Increases simplicity, lowers price
Allows you to focus on business value instead of technical details
Questions?
Summary and questions
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