This document discusses pragmatic model driven development using smart use cases and domain driven design. It describes modeling smart use cases at the user goal and sub-function levels and decorating them with stereotypes. The smart use cases are then mapped to a software architecture with separate layers for presentation, process, domain, and data. Domain driven design principles are discussed, including defining entities, value objects, and smart references as properties of classes. Text templating engines are described for generating code from models, with Tobago MDA given as an example tool.

1. Pragmatic model driven development in Java using
smart use cases and domain driven development
Sander Hoogendoorn, Capgemini
Rody Middelkoop, Avisi
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2. Sander Hoogendoorn
Capgemini
 Principal technology officer
 Capgemini agile thought leader
 Certifiedglobal software engineer (SE4)
 Chief architect Accelerated Delivery Platform
Other
 Author books (UML, agile) and articles
 Speaker at conferences
 Microsoft Partner Advisory Council .NET
 Columnist Software Release Magazine, SDN Magazine
 Editorial board Software Release Magazine
 Editorial board Tijdschrift IT Management
 Advisory board @Portunity
 Member expert panel Computable
Web
 www.sanderhoogendoorn.com
 www.accelerateddeliveryplatform.com
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3. Rody Middelkoop
Avisi
 Technical consultant
Hogeschool Arnhem Nijmegen (HAN)
 Lecturer Software Engineering
Other
 Sun Certified Java Programmer / Developer
 Author of severalarticles
 ContributorLivre
 Speaker at conferences
Web
 www.avisi.nl
 rodymiddelkoop.blogspot.com
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4. Agenda
Introduction
 Model driven development
 Pragmatic model driven development
 Ourapproach
 Benefite
Smart use cases
 Modeling smart use cases
 Smart use cases in code
Domain driven design
 Domain objects
 Smart references
 Value objects
Generating code
 Text templating
 Using Tobago MDA
Demo’s
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5. Model driven development
An introduction
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6. Model driven development SH
Why?
 Bridge gap between design and code
 Improvequality of delivered software
 Raiseproductivity
 Achieve platform and framework independency
 Increasetestability
How?
 Proprietarytechniques
 DSL’s (textual and graphical)
 UML
 Database
 India
What?
 Modeling tool code generation
 Development tool code generation
 Intermediate code generation
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7. A pragmaticapproach
To model driven development
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8. User interface Software Architecture
specification
1. Map your 5. Finalize your
business processes application
to smart use cases
Existing
Applications Smart
use cases
Forms
Use cases
4. Generate
code using a
Tobago
text template Frameworks
MDA
engine
Specifications
Domain
Domain
objects
Model
Data / Service
Business
classes
models
2. Create the Test
3. Establish
scenario’s
domain model your software
Databases
architecture(s)
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9. Smart use cases
What makes a use cases smart?
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10. Different levels of use cases
Merge
companies
Cloud level High summary
Merge
mortgage systems
Kite level Summary
Place
order
Sea level User goal
Fish level Sub-function
Select
product
Clam level Too low
Insert
orderline
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11. Different levels of use cases
‘Regular’ use cases
Regular Smart
 Only user goal level use cases use case use case
 Use cases ‘as they are intended’
 A single use case describes Format Textual Visual
a single elementary business process
 Differ in granularity too much Very
Granularity Unified
different
 Law of Large Numbers does not apply
Smart use cases Estimates Hard Easier
 User goal and sub function level use cases
 Good unit of work and estimation Unit of work Lousy Good
 A single elementary business process is modeled
in a single use case diagram
Re-use Incidental Normal
 A single user goal level use case
+ auxiliary use cases at sub-function level
 Very similar granularity Traceability
Possible Likely
in code
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12. Modeling smart use cases
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13. Modeling smart use cases
Approach
 Create a use case diagram for each
elementary business process
 Model a (user goal level) use case that
maps to the elementary business process
 Name it after the elementary business
process
 Identify the actors executing the use case
 Identify the sub-function level use cases
 Model include and extend relationships
 Identify supporting actors
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14. Identifying sub-function level use cases
Guidelines
 Identify re-use
 Model one form per use case
 Model one use case per functional web
part
 Isolate unknown functionality
 Identify complex functionality
 Show extensive reporting
 Model complex calculations
 Isolate interaction with others
 Avoid low level (database) interaction
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15. Modeling smart use cases
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16. Smart use case stereotypes
Decorating the model
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17. Smart use case stereotypes RM
What?
 Classify model elements
 Do notaddmeaning to model
 Definecustom stereotypes
Why?
 Speed up analysis and design
 Map design to software architecture
 Generatelots of code!
 Standardizefunctional testing
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18. Adding stereotypes SH
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19. Adding stereotypes
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20. Smart use case stereotypes
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21. Mapping to software architecture
Smart use cases and domain design
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22. Pages
UserControls
Presentation
Panels
Use cases
Process Workflow
Domain objects / Entities
Factories / Repositories
Domain
Enums / Value objects / Smart references
[Mapping]
Table Gateways
Queries
Data / Services
[Mapping]
Outside world Database
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23. Pages
UserControls
Presentation
Panels
Use cases
Process Workflow
Domain objects / Entities
Factories / Repositories
Domain
Enums / Value objects / Smart references
[Mapping]
Service gateways
Service locators
Data / Services
[Mapping]
Exact SAP BizTalk Java
Outside world Services / ESB
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24. Service contracts
Presentation Operation contracts
Data contracts
Use cases
Process Services
Domain objects / Entities
Factories / Repositories
Domain
Enums / Value objects / Smart references
[Mapping]
TableGateways / Service Gateways
Data / Services Queries / Service Locators
[Mapping]
Exact SAP BizTalk Java
Database
Outside world
Services / ESB
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25. Domain driven design
A brief introduction
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26. Domain driven design
Definition
 Base complex domain designs on the model
 Primary focus is on the domain and domain logic
In practice
 Model the domain
 Apply the extended domain driven vocabulary
 Build the domain layer
 Hook in process layer
 Plug in data / services layer
Useful when
 The domain of your application is core
 Two tier is not (never?) desirable
 Application needs to function independent of back
office, data sources or services
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27. Domain driven design
Vocabulary
 Entity / Domain object
 Association
 Value object
 Aggregate
 Repository
 Factory
 Service
Additional vocabulary
 Enumeration
 Smart reference
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28. Example – Class diagram
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29. Defining classes
Properties and property types
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30. Properties and property types RM
Basic types
 string, integer, DateTime
 Include nullable wrapping
Enumerations
 Set up at design time, unchangeable at run-time
 Genders, Categories
Value objects
 No specific instances
 Isbn, Email, Url, Money
Smart references
 Changeable at run-time, such as ContractType
Associations
 Cached domain objects such as Country,
Nationality
 First level citizens such as Customer, Product
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31. Value object
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32. Value object - Implementing
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33. Value object – In use
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34. Smart reference
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35. Smart reference - Table
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36. Smart reference - In entity
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37. Smart reference – In use
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38. Text templating
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39. Model driven development – Template engines SH
How?
 Define project
 Define patterns
 Import model
 Generate deliverable
 Finalize code
Additional features
 Combine model elements
 Combine types of model elements
 Remember location
Changing the model withourlosing code
 Partial classes
 Inherited classes
 Marking code
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40. Tobago MDA – www.accelerateddeliveryplatform.com
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41. Tobago MDA
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42. Tobago MDA
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43. Model driven development - Template engines RM
Properties can
be used in
templates
Template engine
knows (part of)
the UML meta
model
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44. Freemarker
Sitemesh
Presentation
DisplayTag
Struts2
Process XWorkActions
Spring
EJB3 Services
EJB3 DataAccessObjects
Data / Services
Spring
JPA Domain objects
Enums
Domain
Value objects
Smart references
Outside world MySQL
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45. Model driven development - Templates
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46. Generate many things e.g. Table create scripts
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47. Generate many things e.g. Table create scripts
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48. FAQ
You
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49. FAQ SH
Yes
No
I don’t know
I am not allowed to go
into details about this
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50. Generating code
Demo!
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51. www.accelerateddeliveryplatform.com SH
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52. References and questions
www.accelerateddeliveryplatform.com
sander.hoogendoorn@capgemini.com
r.r.middelkoop@avisi.nl
Twitter: aahoogendoorn LinkedIn: aahoogendoornrodym
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