DDD and Spring Boot

ࣗݾ঺հ: @zhanpon • 2017೥10݄ɿϠϑʔʹ৽ଔೖࣾ • 2018೥4݄ɿJava, Spring BootΛ࢖͍͸͡ΊΔ • 2018೥5݄ɿJJUG
CCC 2018 SpringʹॳࢀՃ ձࣾͰͷओͳ׆ಈ • ਪનγεςϜͷ։ൃɾӡ༻ Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

DDDͱ͸Կ͔ • υϝΠϯۦಈઃܭ (Domain-Driven Design) ͷུশ • Eric Evans ͷ
"Domain-Driven Design: Tackling Complexity in the Heart of Software" ͱ͍͏ຊ͕ݩʹͳ͍ͬͯΔ • ෯޿͍࿩୊͕͋ͬͯҰݴͰ͸આ໌Ͱ͖ͳ͍ Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

Α͋͘ΔSpring Bootͷ νϡʔτϦΞϧ 1. ΤϯςΟςΟΛ࣮૷͢Δ 2. ϦϙδτϦΛఆٛ͢Δ 3. ίϯτϩʔϥʔΛ࣮૷͢Δ 4.
׬੒ʂ Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

ΤϯςΟςΟΛ࣮૷͢Δ @Entity public class User { @Id private String id;
private String fullName; // getterͱsetter } Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

ϦϙδτϦΛఆٛ͢Δ public interface UserRepository extends CrudRepository<User, String> { } Copyright
© 2018 Yahoo Japan Corporation. All rights reserved.

ίϯτϩʔϥʔΛ࣮૷͢Δ @RestController public class UserController { @Autowired UserRepository userRepository; @GetMapping("/users")
public List<User> allUsers() { return userRepository.ﬁndAll(); } } Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

υϝΠϯϞσϧශ݂঱ • ୯ͳΔखଓ͖ܕઃܭʹͳͬͯΔ Copyright © 2018 Yahoo Japan Corporation. All
rights reserved.

ࣾ಺ͷϓϩδΣΫτ • ػցֶशͷ੒Ռ෺Λຖ೔ࣗಈͰσϓϩΠ͍ͨ͠ Copyright © 2018 Yahoo Japan Corporation. All
rights reserved.

φΠʔϒʹ࣮૷ͨ͠Β • ϦϙδτϦʹΞΫηε͢ΔΫϥε (DockerRegistryAccessor) ͱ࣮ߦ؀ڥʹσϓϩΠ͢ΔΫϥε (KubernetesDeployer) Λ༻ ҙ͢Δ • DockerRegistryAccessor
͕࠷৽൛Λऔͬͯ͘Δ • KubernetesDeployer ͕ͦΕΛσϓϩΠ͢Δ Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

υϝΠϯϞσϧΛݟग़͢ • ιϑτ΢ΣΞγεςϜͷ͏ͪɺࣗ෼͕ݩʑղ͖͔ͨͬͨ໰୊Λ දݱ͢Δίʔυͷ઎ΊΔྔ͸গͳ͍ • ͦͷ෦෼͕WebΞϓϦέʔγϣϯϑϨʔϜϫʔΫͳͲͷٕज़త ৄࡉʹຒ΋Εͳ͍Α͏ʹ͍ͨ͠ • υϝΠϯ૚͕ٕज़తৄࡉʹґଘ͠ͳ͍Α͏ʹ͢Δ (DIP)
Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

Version • ఆظతʹੜ੒͞ΕΔػցֶशͷ੒Ռ෺ɻྫɿݘೣ෼ྨثͷ2018 ೥12݄15೔9࣌όʔδϣϯ @Value public class Version { private
ﬁnal String modelName; private ﬁnal Instant instant; } Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

VersionSet • Set<Version>ͷϥούʔ Copyright © 2018 Yahoo Japan Corporation. All
rights reserved.

Policy public enum Policy { NONE((versions, t) -> Optional.empty()), LATEST((versions,
t) -> { return versions.latest(); }) private BiFunction<VersionSet, Instant, Optional<Version>> policy; Policy(BiFunction<VersionSet, Instant, Optional<Version>> policy) { this.policy = policy; } } Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

VersionCatalog public interface VersionCatalog { VersionSet list(String modelName); } Copyright

Deployer public interface Deployer { void deploy(Version version); } Copyright

࢓༷มߋ • ػցֶशͷ੒Ռ෺ΛஷΊΔ৔ॴ͕Docker Registry͔ΒΦϒδΣ ΫτετϨʔδʹͳͬͨ ! • VersionCatalog ͷ࣮૷ΫϥεΛม͑Δ͚ͩ Copyright

ϓϩδΣΫτߏ੒ • domainͱapplicationͱ͍͏2ͭͷGradleϓϩδΣΫτΛ࡞ͬͨ • domain͸Javaͷඪ४ϥΠϒϥϦʹ͔͠ґଘ͍ͯ͠ͳ͍ • application͸domainʹґଘ͍ͯ͠Δɻத਎͸;ͭ͏ͷSpring Boot ΞϓϦέʔγϣϯ Copyright

DDD and Spring Boot

DDD and Spring Boot

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υϝΠϯۦಈઃܭͱ Spring BootΛ׆༻ͨ͠ ΞϓϦέʔγϣϯ։ൃ Copyright © 2018 Yahoo Japan Corporation.

૝ఆ͢ΔϦεφʔ • Spring BootΛ৮ͬͨ͜ͱ͕͋Δ • DDDʹ͍ͭͯฉ͍ͨ͜ͱ͕͋Δ Copyright © 2018 Yahoo

ࣗݾ঺հ: @zhanpon • 2017೥10݄ɿϠϑʔʹ৽ଔೖࣾ • 2018೥4݄ɿJava, Spring BootΛ࢖͍͸͡ΊΔ • 2018೥5݄ɿJJUG

DDDͱ͸Կ͔ • υϝΠϯۦಈઃܭ (Domain-Driven Design) ͷུশ • Eric Evans ͷ

ʢࢲʹͱͬͯʣDDDͱ͸Կ͔ • ΦϒδΣΫτࢦ޲ϓϩάϥϛϯάΛݱ࣮ͷෳࡶͳγεςϜʹద ༻͢ΔͨΊͷํ๏࿦ • SOLIDͳઃܭΛ࣮ݱ͢ΔͨΊͷσβΠϯύλʔϯʢ୯Ұ੹೚ͷݪ ଇɺ։์/ด࠯ͷݪଇ……ʣ Copyright © 2018

Ξ΢τϥΠϯ 1. DDDΛ΍ΔϞνϕʔγϣϯ 2. DDDΛ࣮ફͨ͠ܦݧ 3. ٕज़తͳTIPS Copyright © 2018

Part I: DDDΛ΍ΔϞν ϕʔγϣϯ Copyright © 2018 Yahoo Japan Corporation.

ࣦഊஊ • ۀ຿ΞϓϦέʔγϣϯΛSpring BootͷνϡʔτϦΞϧͷԆ௕Ͱ ࣮૷ͨ͠ΒͻͲ͍͜ͱʹͳͬͨ Copyright © 2018 Yahoo Japan

Α͋͘ΔSpring Bootͷ νϡʔτϦΞϧ 1. ΤϯςΟςΟΛ࣮૷͢Δ 2. ϦϙδτϦΛఆٛ͢Δ 3. ίϯτϩʔϥʔΛ࣮૷͢Δ 4.

ΤϯςΟςΟΛ࣮૷͢Δ @Entity public class User { @Id private String id;

ϦϙδτϦΛఆٛ͢Δ public interface UserRepository extends CrudRepository<User, String> { } Copyright

ίϯτϩʔϥʔΛ࣮૷͢Δ @RestController public class UserController { @Autowired UserRepository userRepository; @GetMapping("/users")

׬੒ʂ • ͋ͱ͸ UserController ʹϩδοΫΛॻ͍͍͚ͯ͹OK (?) Copyright © 2018 Yahoo

໰୊఺ • UserΫϥεͷΧϓηϧԽ͸ʁ • UserController ͕ࡍݶͳ͘ෳࡶԽ͢Δ • ୯ମςετ͕ࠔ೉ Copyright ©

υϝΠϯϞσϧශ݂঱ • ୯ͳΔखଓ͖ܕઃܭʹͳͬͯΔ Copyright © 2018 Yahoo Japan Corporation. All

Part II: DDDΛ࣮ફͨ͠ ࣮ྫ Copyright © 2018 Yahoo Japan Corporation.

ࣾ಺ͷϓϩδΣΫτ • ػցֶशͷ੒Ռ෺Λຖ೔ࣗಈͰσϓϩΠ͍ͨ͠ Copyright © 2018 Yahoo Japan Corporation. All

φΠʔϒʹ࣮૷ͨ͠Β • ϦϙδτϦʹΞΫηε͢ΔΫϥε (DockerRegistryAccessor) ͱ࣮ߦ؀ڥʹσϓϩΠ͢ΔΫϥε (KubernetesDeployer) Λ༻ ҙ͢Δ • DockerRegistryAccessor

φΠʔϒʹ࣮૷ͨ͠Β • ͱΓ࣮͋͑ͣ૷Ͱ͖ͦ͏ɻ͔͠͠΋ͬͱෳࡶʹͳͬͨΒʁ • UserControllerͷΑ͏ʹͲΜͲΜෳࡶʹͳΔ Copyright © 2018 Yahoo Japan

૿͑Δཁ݅ • ࣗಈσϓϩΠ͢Δ࣌ؒଳΛ੍ݶ͍ͨ͠ • ٳ೔͸σϓϩΠΛېࢭ͍ͨ͠ • ࠷৽൛͡Όͳͯ҆͘ఆ൛ΛσϓϩΠ͍ͨ͠ Copyright © 2018

υϝΠϯϞσϧΛݟग़͢ • ιϑτ΢ΣΞγεςϜͷ͏ͪɺࣗ෼͕ݩʑղ͖͔ͨͬͨ໰୊Λ දݱ͢Δίʔυͷ઎ΊΔྔ͸গͳ͍ • ͦͷ෦෼͕WebΞϓϦέʔγϣϯϑϨʔϜϫʔΫͳͲͷٕज़త ৄࡉʹຒ΋Εͳ͍Α͏ʹ͍ͨ͠ • υϝΠϯ૚͕ٕज़తৄࡉʹґଘ͠ͳ͍Α͏ʹ͢Δ (DIP)

ࠓճͷυϝΠϯϞσϧ Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

Version • ఆظతʹੜ੒͞ΕΔػցֶशͷ੒Ռ෺ɻྫɿݘೣ෼ྨثͷ2018 ೥12݄15೔9࣌όʔδϣϯ @Value public class Version { private

VersionSet • Set<Version>ͷϥούʔ Copyright © 2018 Yahoo Japan Corporation. All

Policy public enum Policy { NONE((versions, t) -> Optional.empty()), LATEST((versions,

VersionCatalog public interface VersionCatalog { VersionSet list(String modelName); } Copyright

Deployer public interface Deployer { void deploy(Version version); } Copyright

࢓༷มߋ • ػցֶशͷ੒Ռ෺ΛஷΊΔ৔ॴ͕Docker Registry͔ΒΦϒδΣ ΫτετϨʔδʹͳͬͨ ! • VersionCatalog ͷ࣮૷ΫϥεΛม͑Δ͚ͩ Copyright

DDDΛ΍ͬͯྑ͔ͬͨ͜ͱ • ࢓༷มߋָ͕ • ςετ͕͠΍͍͢ • ࣗ෼ͷ໰୊ʹର͢Δཧղ͕ίʔυͱͯ͠දݱ͞ΕΔ Copyright © 2018

࠷ޙʹ ͢΂ͯͷιϑτ΢ΣΞγεςϜ͸ɺεςʔΫϗϧμʔʹ2ͭͷҟͳ ΔՁ஋Λఏڙ͢ΔɻͦΕ͸ʮৼΔ෣͍ʯͱʮߏ଄ʯͰ͋Δɻ — Robert C. Martin Copyright © 2018

͓·͚ Copyright © 2018 Yahoo Japan Corporation. All rights reserved.

Part III: ٕज़తͳTIPS Copyright © 2018 Yahoo Japan Corporation. All

ϓϩδΣΫτߏ੒ • domainͱapplicationͱ͍͏2ͭͷGradleϓϩδΣΫτΛ࡞ͬͨ • domain͸Javaͷඪ४ϥΠϒϥϦʹ͔͠ґଘ͍ͯ͠ͳ͍ • application͸domainʹґଘ͍ͯ͠Δɻத਎͸;ͭ͏ͷSpring Boot ΞϓϦέʔγϣϯ Copyright