2019-02-20-ddd taiwan-community-iddd-studygroup-1st

Guide attendees to learn from iDDD Ch1. Know why and how to judge apply DDD or not. Also introduced explict business intention is the way to decrease the gap between Domain Experts and Team

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

2. © 2019, Domain Driven Design Taiwan Community
0-<WP*!
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•[Gamma et al.],[Fowler, PoEAA]: ";<NL4!Martin
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3. © 2019, Domain Driven Design Taiwan Community

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Strategic Design
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4. © 2019, Domain Driven Design Taiwan Community

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5. © 2019, Domain Driven Design Taiwan Community
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6. © 2019, Domain Driven Design Taiwan Community
(Strategic Modeling)

7. © 2019, Domain Driven Design Taiwan Community
Ch1 –DDD<
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DDD
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11. © 2019, Domain Driven Design Taiwan Community

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13. © 2019, Domain Driven Design Taiwan Community
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17. © 2019, Domain Driven Design Taiwan Community
Anemic Domain Model
https://www.mamanatural.com/anemia-during-pregnancy/

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All Yes, or All No

19. © 2019, Domain Driven Design Taiwan Community

package solid.humank.domains;
public class Order {
private intquantity;
private String seatNo;
private booleandrinkHere;
private intprice;
private String itemName;
private String establishTime;
private intdrinktemperature;
}

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package solid.humank.domains;
import lombok.Data;
@Data
public class Order {
private intquantity;
private String seatNo;
private booleandrinkHere;
private intprice;
private String itemName;
private String establishTime;
private intdrinktemperature;
}
public intgetQuantity() {
return quantity;
}
public void setQuantity(intquantity) {
this.quantity= quantity;
}
public String getSeatNo() {
return seatNo;
}
public void setSeatNo(String seatNo) {
this.seatNo= seatNo;
}
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21. © 2019, Domain Driven Design Taiwan Community
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22. © 2019, Domain Driven Design Taiwan Community
Transaction Script
• ()

23. © 2019, Domain Driven Design Taiwan Community
Martin Fowler
1) %
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! :https://bit.ly/2NfZYlH

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Transaction Script
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•saveCustomer?
•(?)

25. © 2019, Domain Driven Design Taiwan Community

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26. © 2019, Domain Driven Design Taiwan Community
-1
Patient.setShotType(ShotTypes.TYPE_FLU);
Patient.setDose(dose);//
Patient.setNurse(nurse);
:
No comment from DE
•PatientsetNurse?
•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);
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29. © 2019, Domain Driven Design Taiwan Community
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•Code Base

30. © 2019, Domain Driven Design Taiwan Community
Customer

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public interface Customer {
public void changePersonalName(String firstName, String lastName);
public void postalAddress(PostalAddresspostalAddress);
public void relocateTo(PostalAddresschangedPostalAddress);
public void changeHomeTelephone(Telephone telephone);
public void disconnectHomeTelephone();
public void changeMobileTelephone(Telephone telephone);
public void disconnectMobileTelephone();
public void primaryEmailAddress(EmailAddressemailAddress);
public void secondaryEmailAddress(Email Address);
}

•String àPostalAddress
•String àTelephone
•EmailString àEmailAddress
•()

32. © 2019, Domain Driven Design Taiwan Community
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33. © 2019, Domain Driven Design Taiwan Community
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(Domain Event 8)

34. © 2019, Domain Driven Design Taiwan Community
DDD 0$
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Scrum

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Agile / Scrum ?

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: Backlog item Sprint
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sprint
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<( backlog sprint. %1backlog#2
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backlog5 sprint1@DA: . 1
sprint$>4%stakeholders

39. © 2019, Domain Driven Design Taiwan Community
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40. © 2019, Domain Driven Design Taiwan Community
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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
• !