The document discusses Domain Driven Design (DDD) principles and patterns, highlighting concepts such as bounded contexts, strategic design, and tactical design patterns. It references key literature and methodologies while providing examples of code implementation and design patterns. Additionally, it emphasizes the importance of a ubiquitous language and agile practices within a DDD framework.

1. © 2019, Domain Driven Design Taiwan Community
Kim Kao ( )
Feb 20, 2019
Getting started with DDD

2. © 2019, Domain Driven Design Taiwan Community
• Pattern Name (#) : ,
• Bounded Context(2) : Bounded
Context
• Bounded Context : Bounded Context
• [reference] :
• [Evans]: Eric Evans
• [Evans, Ref]: Evans
• [Gamma et al.],[Fowler, PoEAA]: Martin
Fowler

3. © 2019, Domain Driven Design Taiwan Community
Strategic Design
, ,
– Ch4
PoEAA, EIP, RESTful, CQRS, Event Driven
Tactical Design Pattern
(Entity, Value Object, Repository .......)
2003 10 , DDD
:
Aggregate + Event Sourcing

4. © 2019, Domain Driven Design Taiwan Community
•
• Pair Mob programming
•
• https://github.com/ddd-tw
Strategic Design
, ,
– Ch4
PoEAA, EIP, RESTful, CQRS, Event Driven
Tactical Design Pattern
(Entity, Value Object, Repository .......)
2003 10 , DDD
:
Aggregate + Event Sourcing

5. © 2019, Domain Driven Design Taiwan Community
DDD
• (Ubiquitos Language) –
(Bounded Context,2)
•
• 1st meetup : , , ,
• :

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(Strategic Modeling)

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Ch1 – DDD
• DDD
• DDD
• DDD
• DDD
• , , DDD
DDD

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DDD
DDD WhirlPool

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• (X), (O) (O) (O) (O)
•
• !? !?
•
•

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“
“

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DDD
•
..
•
• !
•
• Job security
• SA SA , SD SD ,
• , UML
•
•
• Living Document
•
•

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DDD
•
•
•
•
•
• UML ( )
• (HA, Cloud)
• DDD
•
•
•

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DDD à
CRUD
DDD
0 CRUD
25~30 ! 30
User Story Use Case Flow
1 30
30~40 User Story Use
Case Flow
2
? 3 1.
CRUD
2.
4 DDD
5 DDD
7 DDD

17. © 2019, Domain Driven Design Taiwan Community
Anemic Domain Model
https://www.mamanatural.com/anemia-during-pregnancy/

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• Anemic Domain Object -
•
• 2000
• Java EE, ASP.net,
•
•
• public getter/setter, ( ) ?
• xxxService,xxxApplication
getter/setter?
All Yes, or All No

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package solid.humank.domains;
public class Order {
private int quantity;
private String seatNo;
private boolean drinkHere;
private int price;
private String itemName;
private String establishTime;
private int drinktemperature;
}

20. © 2019, Domain Driven Design Taiwan Community
package solid.humank.domains;
import lombok.Data;
@Data
public class Order {
private int quantity;
private String seatNo;
private boolean drinkHere;
private int price;
private String itemName;
private String establishTime;
private int drinktemperature;
}
public int getQuantity() {
return quantity;
}
public void setQuantity(int quantity) {
this.quantity = quantity;
}
public String getSeatNo() {
return seatNo;
}
public void setSeatNo(String seatNo) {
this.seatNo = seatNo;
}
• Getter/Setter(Accessor/Mutator)
• Getter/Setter
• à
• /
• ” ” /

21. © 2019, Domain Driven Design Taiwan Community
• –
(O-R Mapping)
•
• xxxService, xxxApplication
• Active Record [Folwer,PoEAA]
•
• [Fowler,PoEAA] Transaction Script

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Transaction Script
• ( )

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Martin Fowler
1)
2) GoF Command Pattern
: https://bit.ly/2NfZYlH

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Transaction Script
?
• saveCustomer ?
• ( ?)

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?
•
•
•
Customer

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-1
Patient.setShotType(ShotTypes.TYPE_FLU);
Patient.setDose(dose);//
Patient.setNurse(nurse);
:
No comment from DE
• Patient setNurse ?
• Patient ShotType
• ?

27. © 2019, Domain Driven Design Taiwan Community
-2
Patient.giveFluShot();:
“ ”
• ?
•

28. © 2019, Domain Driven Design Taiwan Community
-3
Vaccine vaccine = Vaccines.standardAdultFluDose();
nurse.administerFluVaccine(patient, vaccine);
:
“ ”
•
•
• ?

29. © 2019, Domain Driven Design Taiwan Community
• Glossary
“ ”
• UML
• /
•
• Wiki
• Sprint planning
• Code Base

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Customer

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public interface Customer {
public void changePersonalName(String firstName, String lastName);
public void postalAddress(PostalAddress postalAddress);
public void relocateTo(PostalAddress changedPostalAddress);
public void changeHomeTelephone(Telephone telephone);
public void disconnectHomeTelephone();
public void changeMobileTelephone(Telephone telephone);
public void disconnectMobileTelephone();
public void primaryEmailAddress(EmailAddress emailAddress);
public void secondaryEmailAddress(Email Address);
}
• String à PostalAddress
• String à Telephone
• Email String à EmailAddress
• ( )

32. © 2019, Domain Driven Design Taiwan Community
(Ubiquitous Language)
•
•
• Scope, team matters
• (Bounded Context)
à
•
•
(Context Mapping,3)

33. © 2019, Domain Driven Design Taiwan Community
DDD
•
•
•
•
•
•
•
•
• (Aggregate,10) (Entity,5) (Value Object,6) (Domain Service,7)
(Domain Event 8)

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DDD
•
•
•
• ? ?

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Scrum

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Agile / Scrum ?

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: Backlog item Sprint
•
•
backlog sprint
• Client
•
scrum team, ?

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Scrum Team member,
” ”
sprint
:
backlog sprint. backlog
sprint
backlog sprint .
sprint stakeholders

39. © 2019, Domain Driven Design Taiwan Community
DDD
•
• ?
Transaction Script
• DDD
• Transaction Script
•
•
•
• DDD ?

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TDD
•
•
•
•
•

41. © 2019, Domain Driven Design Taiwan Community
Kent Beck Simple Design
1. Passes the tests
2. Reveals intention
3. No duplication
4. Fewest elements
TDD
1. Write new code only if an automated test has failed
2. Eliminate duplication

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TDD is natural fit in DDD

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DDD
• TDD
• Kata -
http://butunclebob.com/ArticleS.UncleBob.TheBowlin
gGameKata
•