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DDD with C 3.0 features Solar System Simulation
Andre Boonzaaijer, Pieter-Joost van de
Sande aboonzaaijer, pjvdsande_at_sogyo.nl http//b
orn2code.net http//whiletrue.nl
http//sogyo.nl
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Todays agenda

• DDD short intro
• Case Problem definition
• Case C (2.0) solution
• Case C 3.0 extensions
• Demo

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What is Domain Driven?
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Its not Layering
Presentation Layer
Data Layer
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Layering
Presentation Layer
Business logic
Data Layer
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Layering
Presentation Layer
Data Layer
Business logic
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Layering
Presentation Layer
Business logic
Data Layer
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Layering
/- 2 years
Presentation Layer
Business logic
Data Layer
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Layering
/- 2 years
Presentation Layer
Business logic
/- 5 years
Data Layer
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Layering
/- 2 years
Presentation Layer
?
Business logic
/- 5 years
Data Layer
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Layering
Where?
Presentation Layer
Printing
Email
Business logic
Email
SMS
Data Layer
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Layering
Presentation Layer
Business logic
Data Layer
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Sunflower
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Case

• Build a runnable solar system simulator
• 1 star in the centre
• Configurable amount of planets (mass is max 1 of
  the stars mass)
• Laws of physics
• F M a
• Fg M1M2 / d2
• Starting point Random generated
• Draft a domain model.

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Gravity
(x,y)
force 0 Foreach body in universe force
body.getForce(x,y) body.move(force)
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Domain
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Wrapping the domain
Bootstrapper / Host
User Interface
Clock
Database
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User Interface
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Clock

• Standard implementation
• Configurable interval
• Start(), Stop(), Tick event

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Database

• O/R bridging
• Table per domain class
• Column for public properties (discussion)
• Associations converted to foreign keys

?
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Bootstrap

• Instantiation (create form, clock and universe
  components)
• Event subscription

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Domain in C 3.0
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Domain in C 3.0
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Universe class Methods

• TimerPassed() method
• - Classic
• - Lambda

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Universe class Methods

• GetPlanetsInRange() Method

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Universe class Methods

• GetPlanetsInRange() Method Lambda

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Universe class Methods

• GetPlanetsInRange() Method LINQ

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Form1 class Methods
DrawUniverse Who is responsible? UI.DrawUniverse
() vs Universe.Draw()
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Universe.Draw() Extension
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Universe.Draw() Extension
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Extension Methods How

• Add a Static class to your namespace
• Add static methods for each extension
• Add a this parameter to the ext. method

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Refences

• DDD Masterclass (http//domaindrivendesign.nl)
• Rebecca Wirfs-Brock Object Design
• Eric Evans Domain Driven Design
• Blogs
• http//born2code.net
• http//whiletrue.nl
• http//software-innovators.nl

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