ScalaによるDDDライクなプロダクト開発

4DBMBʹΑΔ%%%ϥΠΫͳ ϓϩμΫτ։ൃ φΠϧɾϞόΠϧϑΝΫτϦʔ߹ಉษڧձ φΠϧגࣜձࣾएদܚ৴

ࣗݾ঺հ एদܚ৴ φΠϧגࣜձࣾΤϯδχΞ 5XJUUFSɾ(JUIVCZTIOC ʢ΄ͱΜͲ׆ಈͯ͠·ͤΜʣ ͜͜࠷ۙ͸4DBMBΛ΍͍ͬͯ·͢ WJNΛ࢖͍ͬͯ·͢

ࠓճͷϓϩμΫτ։ൃʹ͍ͭͯ

ࠓճͷϓϩμΫτ։ൃͷ৚݅ •  Ϗδωε্ͷཁٻ͕ൺֱతଟذʹΘͨΔ •  ؔ܎ऀͷϩʔϧ΋ଟ͍ –  ϓϩμΫτΦʔφʔɺΦϖϨʔλʔɺ؅ཧ෦໳ͳͲ •  ௕ظతͳӡ༻͕ݟࠐ·ΕΔ
͜ΕΒͷ৚݅Λߟྀͯ͠ υϝΠϯۦಈઃܭʢ%%%ʣΛ࠾༻

ࠓճͷʮυϝΠϯۦಈઃܭʯʹ͍ͭͯ •  υϝΠϯۦಈઃܭͷίϯηϓτΛऔΓೖΕͯɺ ઃܭ΍։ൃΛ࣮ࢪ •  ඞͣ͠΋ݪଇ௨ΓͰ͸ͳ͍ܗͰ υϝΠϯۦಈઃܭͷίϯηϓτΛ࠾༻

ͳͥ4DBMBͰ%%%ͳͷ͔ʁ •  ࣮༻తͳγϯλοΫεͷ؆ܿ͞ –  ϞσϧΛ࣮૷ʹམͱ͢ίετ͕௿͍ •  ܕγεςϜ͕ڧྗ –  ੩తܕ෇͚ʹΑΔܕ҆શੑ͸ ϏδωεϩδοΫ͕ෳࡶͳέʔεͰޮՌత
–  ϞσϧΛܕͰදݱ͢Δ͜ͱ͕Ͱ͖Δ

υϝΠϯۦಈઃܭͱ͸

υϝΠϯۦಈઃܭͱ͸ ιϑτ΢ΣΞͷઃܭख๏Ͱ͋ΓɺʮෳࡶͳυϝΠ ϯͷઃܭ͸ɺϞσϧϕʔεͰߦ͏΂͖ʯͰ͋Γɺ ·ͨʮେ൒ͷιϑτ΢ΣΞϓϩδΣΫτͰ͸ɺγ εςϜΛ࣮૷͢ΔͨΊͷಛఆͷٕज़Ͱ͸ͳ͘ɺυ ϝΠϯͦͷ΋ͷͱυϝΠϯͷϩδοΫʹয఺Λஔ ͘΂͖ʯͰ͋Δͱ͢Δ CZ8JLJQFEJB

ʁʁʁ

΋͏গ͠Θ͔Γ΍͘͢

υϝΠϯۦಈͰ͸ͳ͍ઃܭͷྫ   ࣮ݱ͍ͨ͠ػೳɾݟͨ໨ΛܾΊΔ   ٕज़બఆ΍ઃܭΛߦ͍ɺ ۩ମతͳ࣮૷ٕज़ͰػೳΛ࣮ݱ͢Δ ͜Ε͸υϝΠϯͷຊ࣭͕Կͳͷ͔ʁΛ໌Β͔ʹ͓ͯ͠Βͣɺ υϝΠϯۦಈઃܭͰ͸ͳ͍

υϝΠϯۦಈઃܭ͸ʁ   ϏδωεྖҬͷϢϏΩλεݴޠ ʢ౷ҰݴޠʣΛߏங   ʮ࣮ݱ͍ͨ͜͠ͱʯʮ࣮ݱ͢Δ͜ͱʯΛ ϢϏΩλεݴޠͰදݱ   ϢϏΩλεݴޠͰදݱ͞ΕͨυϝΠϯϞσϧΛ ۩ମతͳ࣮૷ٕज़Ͱ࣮૷͢Δ

ϢϏΩλεݴޠʹΑΔ υϝΠϯϞσϧ

ϓϩμΫτ։ൃʹ͓͚ΔݴޠͷִͨΓ ϓϩμΫτΦʔφʔ ։ൃऀ ΫϥΠΞϯτ ΫϥΠΞϯτ

ϓϩμΫτ։ൃʹ͓͚ΔݴޠͷִͨΓ ϓϩμΫτΦʔφʔ ։ൃऀ ΫϥΠΞϯτ ΫϥΠΞϯτ ʮΫϥΠΞϯτʯ͸ಉ͡ҙຯʁ

ϢϏΩλεݴޠͰ༻ޠΛ౷Ұ ༻ޠͷఆٛΛ໌֬ʹ͢Δ ސ٬ ͓٬༷ Ϗδωε্ͷΫϥΠΞϯτ ΫϥΠΞϯτ αʔόɾΫϥΠΞϯτϞσϧͷ ΫϥΠΞϯτʢٕज़༻ޠʣ •  ౷ҰͷޠኮͰཁ݅ɾ࢓༷ΛܾΊΔ
•  ౷ҰޠኮͰද͞ΕͨϏδωε্ͷ஌ࣝΛϞσϧԽ͢Δ

౷ҰޠኮͰυϝΠϯͷ஌ࣝΛද͢ •  ̍ͭͷʮސ٬ʯ͸ෳ਺ͷʮϓϩδΣΫτʯΛ࣋ͭ •  ʮϢʔβʯ͸ʮϓϩδΣΫτʯ͝ͱ ʮݖݶʯΛมߋ͢Δ͜ͱ͕Ͱ͖Δ ʮϢʔβʯͱ͸ʁʮݖݶʯͱ͸ʁͳͲ͕ ໌֬ʹͳ͍ͬͯΔͷͰɺ ʮϢʔβʯʹର͢ΔೝࣝͷζϨ΋ੜ͡ͳ͘ͳΔ

υϝΠϯͷ஌ࣝΛϞσϧԽ 顧客プロジェクト ϞσϧΛͲ͏දݱ͢Δ͔ʁ͸ͦ͜·ͰॏཁͰ͸ͳ͍ Ͳ͏͍͏ϞσϧͰ͋Δ͔ʁΛ νʔϜͷதͰڞ༗Ͱ͖͍ͯΔ͜ͱ͕ॏཁ ϞσϧԽͷྫ

υϝΠϯۦಈΛ࣮ݱ͢Δ ΞʔΩςΫνϟ

ΞʔΩςΫνϟ΁ͷཁٻ •  υϝΠϯϞσϧ͕ओମʹͳΔ΂͖ –  Ϟσϧ͕ಛఆͷ࣮૷ٕज़ʹґଘͯ͠͸͍͚ͳ͍ •  ٕज़తͳؔ৺ࣄ͸υϝΠϯͷؔ৺ࣄͱ ෼཭͞Ε͍ͯΔ΂͖

ҰൠతͳϨΠϠʔԽΞʔΩςΫνϟ Infrastructure Layer UI & Presenta1on Layer Applica1on Layer Domain
Layer

ҰൠతͳϨΠϠʔԽΞʔΩςΫνϟ Infrastructure Layer UI & Presenta1on Layer Applica1on Layer Domain
Layer υϝΠϯ૚͕ΠϯϑϥετϥΫνϟ૚ ʢ۩ମతͳ࣮૷ٕज़ʣʹґଘͯ͠͠·͍ͬͯΔ

࠾༻ͨ͠ΞʔΩςΫνϟ Domain Layer Infrastructure Layer UI & Presenta1on Layer Applica1on
Layer

Layer υϝΠϯ૚Λ࠷ԼҐͷϨΠϠʔ΁ ΠϯϑϥετϥΫνϟ૚ͷར༻͕ඞཁͳՕॴ͸ ͦͷΠϯλʔϑΣΠεΛఏڙ

Layer ΠϯϑϥετϥΫνϟ૚͸࠷্ҐͷϨΠϠʔʹ͠ ԼҐϨΠϠʔͷΠϯλʔϑΣΠεΛ࣮૷

ΞʔΩςΫνϟΛ࣮ݱ͢Δʹ͸ •  ηύϨʔτΠϯλʔϑΣΠε΁ ۩ମతͳ࣮૷Λ༩͑Δඞཁ͕͋Δ •  ޙ͔Β࣮૷Λ༩͑Δखஈ –  %FQFOEFODZ*OKFDUJPO %*
–  4FSWJDF-PDBUPS –  ͳͲ •  ࠓճ͸%*Ͱ࣮૷Λఏڙˠ4DBMBͰ͸ʁ

4DBMBʹΑΔ੩త%* trait RepositoryRegistry { val fooRepository: Repo } // fooRepositoryΛ࢖͏Ϋϥε
trait BarService { this: RepositoryRegistry => def doSomething = { fooRepository.fetch } } // ࣮૷Λ࣋ͭτϨΠτ trait RepositoryRegistryImpl { // Repo͸࣮૷ val fooRepository = Repo } // ࣮૷Λಋೖ class BerServiceImpl extends RepositoryRegistryImpl

trait BarService { this: RepositoryRegistry => def doSomething = { fooRepository.fetch } } // ࣮૷Λ࣋ͭτϨΠτ trait RepositoryRegistryImpl { // Repo͸࣮૷ val fooRepository = Repo } // ࣮૷Λಋೖ class BerServiceImpl extends RepositoryRegistryImpl ͜Ε͸ͨͩͷΠϯλʔϑΣΠεʢUSBJUʣ

trait BarService { this: RepositoryRegistry => def doSomething = { fooRepository.fetch } } // ࣮૷Λ࣋ͭτϨΠτ trait RepositoryRegistryImpl { // Repo͸࣮૷ val fooRepository = Repo } // ࣮૷Λಋೖ class BerServiceImpl extends RepositoryRegistryImpl ࣗ෼ܕΞϊςʔγϣϯͰUSBJU΁ͷґଘΛએݴ

trait BarService { this: RepositoryRegistry => def doSomething = { fooRepository.fetch } } // ࣮૷Λ࣋ͭτϨΠτ trait RepositoryRegistryImpl { // Repo͸࣮૷ val fooRepository = Repo } // ࣮૷Λಋೖ class BerServiceImpl extends RepositoryRegistryImpl ͜͜Ͱ۩ମతͳ࣮૷Λ༩͍͑ͯΔ %*

trait BarService { this: RepositoryRegistry => def doSomething = { fooRepository.fetch } } // ࣮૷Λ࣋ͭτϨΠτ trait RepositoryRegistryImpl { // Repo͸࣮૷ val fooRepository = Repo } // ࣮૷Λಋೖ class BerServiceImpl extends RepositoryRegistryImpl ࣮૷Λಋೖ͢Δલͷஈ֊Ͱ ґଘΛએݴͨ͠USBJUͷϝιου͕࢖͑Δ

4DBMBʹΑΔϞσϧͷ࣮૷

ϞσϧΛઃܭɾ࣮૷ʹམͱ͢ •  υϝΠϯ૚ͷ࣮૷ •  υϝΠϯۦಈઃܭʹ͓͍ͯఆٛ͞Εͨಓ۩Λ࢖ ͍4DBMBͷίʔυͰදݱ͢Δ •  %%%ͷಓ۩ –  &OUJUZ
–  7BMVF0CKFDU –  4FSWJDF –  3FQPTJUPSZ –  ͳͲ

ྫɿ7BMVF0CKFDUͷ࣮૷ •  7BMVF0CKFDU –  ஋Λදݱ͢ΔΦϒδΣΫτ –  ஋ࣗମʹυϝΠϯ্ͷҙຯΛ࣋ͨͤΔ •  ྫɿՁ֨ʢ1SJDFʣ – 
ʮԁʯʹؚ·ΕΔཁૉ͸ʮʯͱʮԁʯ –  1SJDFͷϞσϧ͸࣍ͷཁૉΛ࣋ͭ •  WBMVF •  DVSSFODZ+1:

+BWBʹΑΔ1SJDFΫϥε public class Price { public int value; // Ձ֨ͷ஋
public Currency currency; // ௨՟ Price(int value, Currency currency) { this.value = value; this.currency = currency; } } // PriceΦϒδΣΫτͷੜ੒ new Price(100, new Currency(JPY))

4DBMBʹΑΔ1SJDFΫϥε case class Price(value: Int, currency: Currency) // case class
ʹΑΓ্هͷҰߦͰදݱग़དྷΔ // ͜Ε͚ͩͰ৽͍͠ΦϒδΣΫτΛੜ੒Մೳ Price(100, JPY)

4DBMBʹΑΔ1SJDFΫϥε case class Price(value: Int, currency: Currency) // case class
ʹΑΓ্هͷҰߦͰදݱग़དྷΔ // ͜Ε͚ͩͰ৽͍͠ΦϒδΣΫτΛੜ੒Մೳ Price(100, JPY) ϞσϧԽ͢Δ࣮૷ίετ͕ͱͯ΋খ͍͞

ܕύϥϝʔλʹΑΔදݱ trait Tax case object IncludingTax extends Tax
// ੫ࠐ case object ExcludingTax extends Tax // ੫ൈ // ܕύϥϝʔλʢδΣωϦοΫʣʹΑͬͯ΋දݱՄೳ // A͸Taxͷαϒܕ case class Price[A <: Tax](value: Int, currency: Currency) // 100ԁʢ੫ࠐʣͷදݱ Price[IncludingTax](100, JPY)

ܕύϥϝʔλʹΑΔදݱ trait Tax case object IncludingTax extends Tax
// ੫ࠐ case object ExcludingTax extends Tax // ੫ൈ // ܕύϥϝʔλʢδΣωϦοΫʣʹΑͬͯ΋දݱՄೳ // A͸Taxͷαϒܕ case class Price[A <: Tax](value: Int, currency: Currency) // 100ԁʢ੫ࠐʣͷදݱ Price[IncludingTax](100, JPY) ੫ൈɾ੫ࠐΛܕύϥϝʔλʹΑͬͯදݱ

ܕύϥϝʔλʹΑΔදݱ // ঎඼ͷՁ֨͸੫ࠐͰ͋Δ͜ͱ͕ܕͰදݱग़དྷΔ case class Product( name: String,
price: Price[IncludingTax] ) // ঎඼ͷදݱྫ Product(“ίοϓຊ”, Price[IncludingTax](4968, JPY)) ͜ͷΑ͏ͳܗͰɺϞσϧΛ؆͔ܿͭܕ҆શʹ ίʔυʹམͱ͍ͯ͘͜͠ͱ͕Մೳ

·ͱΊ

4DBMBʹΑΔ%%%͸Ͳ͏ͳͷʁ •  υϝΠϯۦಈઃܭʹ͓͚Δ4DBMBͷ࠾༻͸ ʢ࣮૷ίετɾදݱྗͷ؍఺ͰʣϝϦοτ͕େ͖͍ •  ͨͩ͠ɺͲͷϓϩμΫτʹ΋ద͍ͯ͠ΔΘ͚Ͱ͸ͳ͍ –  ྫ͑͹ɺϓϩτλΠϓతͳϓϩμΫτʹ͸ෆ޲͖ •  ϓϩμΫτʹదͨ͠ઃܭख๏ΛऔΕ͍ͯΔ͔͕
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ScalaによるDDDライクなプロダクト開発

ScalaによるDDDライクなプロダクト開発

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