Page 1 Model Based Software Development - a pragmatic view Mikkel Lauritsen Intentia R&D A/S

Page 2  Introduction  Modeling  Model based software development ... in an ideal world: MDA ... in the real world: DSL’s  Demo  Summary and questions Agenda

Page 3 The next 2 x 45 minutes will be  Pragmatic  Useful in ”the real world”  Focused on technology Introduction

Page 4 $ The business angle

Page 5 Hopefully you will get an idea about  What is model driven software development?  Why use it? Other stuff includes  a bunch of acronyms Introduction

Page 6 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

Page 7  Introduction  Modeling  Model based software development ... in an ideal world: MDA ... in the real world: DSL’s  Demo  Summary and questions Agenda

Page 8 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

Page 9 Level 0Information (data) Product(”DVD Player”, ) Level 1Model (metadata) Record(”Product”, (Field(”name”, String), Field(”price”, Money)) Level 2Metamodel (meta-metadata) Class(”Record”, (Attr(”name”, String), Attr(”fields”, List )) Class(”Field”, […]) Level 3Meta-metamodel Hardwired Modeling

Page 10  Introduction  Modeling  Model based software development ... in an ideal world: MDA ... in the real world: DSL’s  Demo  Summary and questions Agenda

Page 11 What is software development?  Specification  Design  Coding  Testing  etc. And processes to connect it all Software development

Page 12  ´The challenge: it’s too difficult Coding Time to write code Total time Program size Time spent

Page 13  The natural extension of programming languages  High-level primitives  The model becomes the code Model based software development Model (program) Artifacts Generator (compiler)

Page 14  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

Page 15 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

Page 16  Introduction  Modeling  Model based software development ... in an ideal world: MDA ... in the real world: DSL’s  Demo  Summary and questions Agenda

Page 17  MDA is defined by the Object Management Group, OMG   Much theory, little practice Modeling: Model Driven Architecture

Page 18 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

Page 19  Mix of multiple languages for separate domains  Not really useful Modeling: Unified Modeling Language

Page 20 XML is a way of expressing metadata (structure) in textual data Effective XML Elliotte Rusty Harold XML is really great because of  ubiquitous tooling  human readability Modeling: (XMI and) XML

Page 21  Introduction  Modeling  Model based software development ... in an ideal world: MDA ... in the real world: DSL’s  Demo  Summary and questions Agenda

Page 22 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 Modeling: Domain Specific Languages

Page 23 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

Page 24 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

Page 25  Introduction  Modeling  Model based software development ... in an ideal world: MDA ... in the real world: DSL’s  Demo  Summary and questions Agenda

Page 26 Demo

Page 27  Introduction  Modeling  Model based software development ... in an ideal world: MDA ... in the real world: DSL’s  Demo  Summary and questions Agenda

Page 28  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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