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Զͨͪͷ υϝΠϯۦಈઃܭ͸ ͜Ε͔Βͩʂ

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ຊ୩ɹ྄հ

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ෳࡶੑͱͷઓ͍

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όοΫΤϯυ ϑϩϯτΤϯυ σʔλϕʔε

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όοΫΤϯυ ϑϩϯτΤϯυ DTO DTO DTO DTO DTO σʔλϕʔε

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όοΫΤϯυ ϑϩϯτΤϯυ DTO DTO DTO DTO DTO DTO DTO DTO DTO DTO σʔλϕʔε

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όοΫΤϯυ ϑϩϯτΤϯυ DTO DTO DTO DTO DTO DTO DTO DTO DTO DTO ϩδοΫ σʔλϕʔε ϩδοΫ ϩδοΫ

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όοΫΤϯυ ϑϩϯτΤϯυ DTO DTO DTO DTO DTO DTO DTO DTO DTO DTO ϩδοΫ σʔλϕʔε ϩδοΫ ϩδοΫ ෳࡶʹͳͬͯ͘Δ…

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όοΫΤϯυ ϑϩϯτΤϯυ DTO DTO DTO DTO DTO DTO DTO DTO DTO DTO ϩδοΫ σʔλϕʔε ϩδοΫ ϩδοΫ ࢓༷มߋ ෳࡶʹͳͬͯ͘Δ…

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όοΫΤϯυ ϑϩϯτΤϯυ DTO DTO DTO DTO DTO DTO DTO DTO DTO DTO ϩδοΫ σʔλϕʔε ϩδοΫ ϩδοΫ ࢓༷มߋ ෳࡶʹͳͬͯ͘Δ…

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֦ுੑ มߋ༰қੑ … ҡ࣋͢Δͷ͕೉͍͠ʂ

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Ͳ͏ͯ͜͠͏ͳΔʁ

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ίʔυΛݟ͚ͨͩͰ͸ ҙਤ͕ݟ͑ͯ͜ͳ͍ʂ

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࢓༷ॻ ʢͲͷΑ͏ʹʣ ۀ຿஌ࣝ ʢͳͥʣ

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ίʔυ ର৅ۀ຿ʢυϝΠϯʣ ͷݴ༿

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ResultDto Data doExecute

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෼͔ΓͣΒ͍ίʔυͷ׬੒

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ٕज़͕ෳࡶ͔ͩΒʁ

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ର৅ۀ຿ʢυϝΠϯʣ ͕ෳࡶ͔ͩΒʂ

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υϝΠϯۦಈઃܭ

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ଟ͘ͷΞϓϦέʔγϣϯʹ͓͍ͯɺ࠷΋ॏཁͳෳࡶ͞ ͸ɺٕज़తͳ΋ͷͰ͸ͳ͍ɻ Eric Evans

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ෳࡶͳ΋ͷ͸υϝΠϯͦͷ΋ͷɺ͢ͳΘͪɺ Ϣʔβͷ׆ಈ΍ϏδωεͳͷͰ͋Δɻ Eric Evans

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Ϗδωε͕࣋ͭෳࡶੑͱ ઓ͏ಓ۩

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΍ͬͨ͜ͱ υϝΠϯۦಈઃܭʢຊʣ͔Β Ͱ͖ͦ͏ͳͱ͜ΖΛϐοΫΞοϓ ঃʑʹϓϩδΣΫτʹద༻

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1. υϝΠϯϞσϧͷߏங 2. ઃܭύλʔϯͷద༻ 3. υϝΠϯ૚ͷ࡞੒

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ᶃ υϝΠϯϞσϧΛߏங

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υϝΠϯϞσϧͱ͸ʁ

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զʑ͕ର৅ϏδωεΛ ͲͷΑ͏ʹଊ͑ͯɺ ͲͷΑ͏ʹγεςϜԽ͢Δ͔ Λදݱ͢ΔϞσϧ

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ਤॻؗͷۀ຿Λ૝૾ͯ͠ॻ͍ͨྫ ※͋͘·ͰྫͳͷͰਤॻؗͷۀ຿͕ ͢΂ͯ͜ͷϞσϧʹͳΔΘ͚Ͱ͸ͳ͍

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ϞσϧΛ࢖͏ࣄͰԿ͕خ͍͠ͷ͔ʁ υϝΠϯϞσϧΛݩʹ࣮૷͢ΔࣄͰ ίʔυ͕ۀ຿ͷ ஌ࣝɾ֓೦ͱରԠͮ͘

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υϝΠϯϞσϧ ιʔείʔυ υϝΠϯ ʢෳࡶͳϢʔβʔͷ׆ಈɾۀ຿஌ࣝʣ ஌ࣝΛબͼൈ͖ɺந৅Խ υϝΠϯϞσϧΛݩʹઃܭ มߋͷϑΟʔυόοΫ

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ιʔείʔυ υϝΠϯ ʢෳࡶͳϢʔβʔͷ׆ಈɾۀ຿஌ࣝʣ ରԠ͢Δ

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υϝΠϯϞσϧͱ͸ಛఆͷਤͰ͸ͳ͘ɺ ਤ͕఻͑Α͏ͱ͍ͯ͠Δߟ͑ํͰ͋Δ Eric Evans ஫ҙʂʂ

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υϝΠϯϞσϧ͸UMLΫϥεਤ ։ൃͷ࠷ॳʹҰؾʹ࡞ͬͯऴΘΓ Α͋͘Δޡղ

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௒ॏཁ 1. ͓٬͞Μͷۀ຿ͷษڧ 2. γεςϜԽର৅ྖҬͷ֓೦ͷ੔ཧ 3. ॏཁͳ֓೦͔ΒϞσϧΛ࡞੒ ๏ γεςϜԽର৅ྖҬ͚ͩͰ͸ͳ͘ɺͦͷपลͷ஌ࣝ΋ؚΊΔ ๏ γεςϜʹஔ͖׵͑ͨΒͲ͏ͳΔ͔ʁ͸ߟ͑ͳ͍Α͏ʹ͢Δ ๏ ໊ࢺɺಈࢺΛத৺ʹ ๏ ʮ΋ͷʯ͚ͩͰͳ͘ɺϓϩηεʹ΋ண໨͢Δ ๏ ͍͖ͳΓ׬ᘳͳϞσϧ͸ग़ͯ͜ͳ͍ͱׂΓ੾Δ͜ͱ͕େ੾

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ᶄઃܭύλʔϯͷద༻

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υϝΠϯϞσϧ ιʔείʔυ ϞσϧͷҙਤΛ ίʔυʹ൓өͤ͞Δ ઃܭύλʔϯͱ͸…

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1. ΤϯςΟςΟ 2. ஋ΦϒδΣΫτ 3. αʔϏε

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ΤϯςΟςΟ ಉҰੑΛ࣋ͬͨϞσϧཁૉʹద༻ ର৅ͷଐੑ͚ͩͰ͸ ൺֱͰ͖ͳ͍ੑ࣭

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ར༻ऀ ໊લ΍೥ྸΛൺֱͯ͠΋ ಉҰਓ෺͔൑ఆͰ͖ͳ͍

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public class User { private final Long id; private String firstName; private String lastName; public Person(Long id, String firstName, String lastName) { … } public boolean isIdentifiedBy(Person otherPerson) { return this.id == otherPerson.id; } } ҰҙʹͳΔID IDΛ༻͍ͯ ಉҰੑΛൺֱ͢Δ ϝιου

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஋ΦϒδΣΫτ ಉ஋ੑΛ࣋ͬͨϞσϧཁૉʹద༻ ଐੑ͚ͩͰಉҰͳͷ͔ ൺֱͰ͖Δੑ࣭

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ϖʔδ਺ දݱ͍ͯ͠Δ஋ͷΈͰ ಉҰͳͷ͔൑ఆͯ͠΋໰୊ͳ͍ 10ϖʔδ == 10ϖʔδ true 10ϖʔδ == 20ϖʔδ false

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public class NumberOfPages { private final int number; public NumberOfPages(int value) { … } public boolean isSameValueAs(NumberOfPages otherValueObject) { return this.number == otherValueObject.number; } } ϑΟʔϧυͷ஋Λ࢖༻͠ ಉ஋ੑΛൺֱ͢Δϝιου ҰҙʹͳΔID͸࣋ͨͳ͍

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αʔϏε υϝΠϯ಺ͷखଓ͖Λදݱ͢Δ ಛఆͷ֓೦ʹඥ͔ͮͣɺ ϓϩηεͷΈʹؔ৺͕͋Δ

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ି͠ग़͠ ಛఆͷ֓೦ʹඥ͔ͮͣ ϓϩηεͷΈΛද͢

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public class RentalService { // ૹۚ public static Rental rentalBook( User rentalUser, Book rentalBook) { // ି͠ग़ͤΔ͔֬ೝ if (!RentalPolicy.canRental(rentalUser, rentalBook)) throw new IllegalArgumentException(); // ି͠ग़͢ Rental rental = rentalUser.rental(rentalBook); return rental; } } Ϋϥεϝιου ͱ࣮ͯ͠૷͠ಛఆͷ֓೦͔Β෼཭

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ᶅ υϝΠϯ૚ͷ࡞੒

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ෳࡶͳϏδωεΛදݱ͢Δίʔυ͕ ଞͷٕज़ཁૉͷίʔυͱࠞ͟Δ

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Θ͔Γʹ͍͘ίʔυͷग़དྷ্͕Γ ௿ڽू౓ɺີ݁߹...

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υϝΠϯϞσϧʹΑΓಋ͖ग़͞ΕΔ ίʔυΛଞͷٕज़ྖҬ͔Βִ཭

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ϔΩαΰφϧΞʔΩςΫνϟ

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ۀ຿Λද͢ίʔυ

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ﬁntan.jp

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݁ՌͲ͏ͩͬͨʁ

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ᶃ ཧղ͠΍͍͢ίʔυ

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ର৅ۀ຿ʢυϝΠϯʣ ͷݴ༿ ίʔυ

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ҙਤΛදݱ͢Δίʔυ

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։ൃ଎౓޲্ ෆ۩߹ൃੜΛ཈੍

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ᶄίϛϡχέʔγϣϯίετͷ௿ݮ

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ϝϯόશһ͕ ಉ͡υϝΠϯϞσϧΛݩʹ ։ൃ͢Δ

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ϝϯόશһ͕ ଊ͍͑ͯΔۀ຿Ϟσϧ͕ ಉ͡

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ݴ༿ɾߟ͑ํ͕ ཧղͰ͖Δ

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ίʔυʹԿΛՃ͑ͨͷ͔ʁ ίʔυΛͲ͏มߋͨ͠ͷ͔ʁ ͳͥͦΕΛ΍ͬͨͷ͔ʁ ϚʔδϦΫΤετ ·ΔͰࣗ෼͕࡞ۀͨ͠ͷ͔ͷΑ͏ʹ ෼͔Δ

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ᶅ มߋͷӨڹൣғ͕͙͢ʹ෼͔Δ

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ࠓ·Ͱ ཁٻͷมԽ ⬇ ίʔυʹͲΜͳӨڹ͕ग़ΔͩΖ͏͔ʁ

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υϝΠϯۦಈઃܭಋೖޙ ཁٻͷมԽ ⬇ զʑ͕ଊ͍͑ͯΔۀ຿Ϟσϧ͸ Ͳ͏มԽ͢ΔͷͩΖ͏͔ʁ