J2K failure story : UNIT

Transcript

1. +BWB͔Β,PUMJOม׵Ͱ ͷࣦഊஊɿ7PJE➔6OJUฤ 
   ,PUMJO'FTU
   !QBSBZB
2. ࣗݾ঺հ ɾ ࡾӜՂ༞QBSBZB
   
   ɾ גࣜձࣾΠάχεॴଐ
   ɾ XJUI"OESPJE୲౰
   ɾ ,PUMJO͸ͷࠒ͔Β ೥ఔ
3. ,PUMJOԽ͸ίϯόʔτπʔϧ͕͋Δ͔Β؆୯ʂ ͱࢥͬͯ΋࣮ࡍ΍ͬͯΈΔͱ୔ࢁͷ໰୊͕ ͋Γ·͢
4. 7PJEܕҾ਺Λ࣋ͭϝιουͷ,PUMJO ԽͰɺΫϥογϡͤͯ͞͠·ࣦͬͨ ഊஊΛ͓࿩͠·͢ɻ
5. Ҿ਺7PJEΛ࣋ͭϝιου public interface UseCase<Input, OutPut> { OutPut execute(Input input); } public interface SaveActionUseCase extends UseCase<Void, Void> { } class SaveActionUseCaseImpl implements SaveActionUseCase { @Override public Void execute(Void input) { // save boolean value return null; } } δΣωϦΫεΛ࢖ͬͨॲཧͰҾ਺7PJEʹOVMMΛ ड͚౉͢ͱ͍͏έʔε͕ଘࡏ͠·͢
   ྫ͑͹$MFBO"SDIJUFDUVSFͰͷ6TF$BTF࣮૷
6. Ҿ਺7PJEϝιουΛ,PUMJOԽͯ͠ΈΔ interface SaveActionUseCase : UseCase<Unit, Unit> class SaveActionUseCaseImpl : SaveActionUseCase { override fun execute(input: Unit) { // save boolean value } } 6TF$BTFΛ,PUMJOԽͯ͠Έ·͢
   ߋʹҾ਺7PJEΛ6OJUʹͯ͠Έ·ͨ͠
   +BWBͷ7PJE͸,PUMJOͰ͸6OJUͰ͢͠Ͷ
7. Ҿ਺7PJEϝιουΛ,PUMJOԽͯ͠ΈΔ Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameter IsNotNull, parameter input ͔͠͠+BWB͔Β࣮ߦ͢Δͱ࣮ߦ࣌Τϥʔ *MMFHBM"SHVNFOU&YDFQUJPO͕ൃੜͯ͠͠·͏ʜ
8. 6OJUʹ΋/VMMͷ֓೦͸͋Δ private void saveByJava() { saveActionUseCase.execute(null); } ,PUMJOͰݺͼग़ͯ͠ΈΔͱϏϧυΤϥʔʹͳͬ ͍ͯΔɻ6OJU͸Կ΋ͳ͍ঢ়ଶΛදݱ͍ͯ͠Δ͕ /PO/VMMͩͬͨɻ6OJUʹ΋/VMMͷ֓೦͕ଘࡏ͠ ͨʜʂ
9. 6OJU*/45"/$&Λ࢖ͬͯΈΔ private void saveByJava() { saveActionUseCase.execute(Unit.INSTANCE); } private fun saveByKotlin() { saveActionUseCase.execute(Unit) } ݺͼग़͠ଆΛ6OJUΛ౉͢ܗʹॻ͖׵͑·͢ɻ 6OJU͸PCKFDU
   DMBTTͱͯ͠ఆٛ͞Ε͍ͯΔͷͰ ΠϯελϯεΛ౉ͤ·͢
   ͜Ε͸Τϥʔ΋ى͖ͣҰݟ໰୊ͳͦ͞͏ʜ
10. ,PUMJOԽͷӨڹൣғ private void saveByJava1() { saveActionUseCase.execute(Unit.INSTANCE); } private void saveByJava2() { saveActionUseCase.execute(null); // Ϋϥογϡ!! } ݺͼग़͠Օॴ͕ͭͳΒ͍͍͚Ͳɺෳ਺͋Δͱͦ ΕΒΛશ෦ॻ͖׵͑Δ࡞ۀ͕ඞཁͰ͢ɻ
    Ͱ͖Ε͹,PUMJOԽͰͷมߋ͸ɺ,PUMJOԽͨ͠Ϋ ϥε಺ʹཹΊ͍ͨ
11. 7PJE ·ͨ͸6OJU Λ࢖͓͏ interface SaveActionUseCase : UseCase<Unit?, Unit> class SaveActionUseCaseImpl : SaveActionUseCase { override fun execute(input: Unit?) { } } interface SaveActionUseCase : UseCase<Void?, Void?> class SaveActionUseCaseImpl : SaveActionUseCase { override fun execute(input: Void?): Void? { return null } } 6OJU ͷ΄͏͕ΑΓ,PUMJOΆ͍͕+,ίϯόʔτ ޙͷίʔυ͸7PJE ͷ΄͏͕͍ۙɻ͓޷ΈͰɻ
12. ࠓճͷࣦഊஊ͔ΒಘΒΕͨ஌ݟ ɾ 6OJUʹ΋/VMMͷ֓೦͕ଘࡏ͢Δɻ
    ɾ δΣωϦΫεͰ7PJE6OJUҾ਺Λѻ͏ͳΒɺ +BWB͔Βͷݺͼग़͠Λߟྀͯ͠/VMMBCMFͷ 7PJE 6OJU ͷͲͪΒ͔ʹ͢Δඞཁ͕͋Δɻ
    ɾ ,PUMJOԽ͢Δࡍ͸,PUMJOԽͨ͠Ϋϥε಺ʹมߋ ΛཹΊ͓͍ͯͨ΄͏͕Өڹൣғ͕গͳͯ͘˕
13. ༨ஊ ,PUMJOԽ࣌ʹྑ͘ൃੜ͢Δ/VMM୅ೖΫϥογϡ͍ͭͯ+,ίϯόʔ λΛΧεϚΠζ͢Δํ๏Ͱճආ͢Δ಺༰ΛҎલൃද͍ͯ͠·ͨ͠ɻ
    Α͚Ε͹ͪ͜ΒͷεϥΠυ΋ͥͻ
    IUUQTTQFBLFSEFDLDPNQBSBZB KLLPOCBUBXPLBTVUBNBJ[VTVSV
14. ͝੩ௌ͋Γ͕ͱ͏
    ͍͟͝·ͨ͠ʂ
    ྑ͍,PUMJOϥΠϑΛʂ
15. XJUI͸"OESPJEJ04ΤϯδχΞΛେઈࢍืूதʂ
    ϕςϥϯ,PUMJO4XJGUΤϯδχΞ͕αϙʔτ͢ΔͷͰ
    ॳ৺ऀͰ΋,PUMJO4XJGUʹڵຯ͕͋ΔͳΒ
    ؾܰʹԠืͯ͠ΈͯͶʂ
    IUUQTXXXXBOUFEMZDPNQSPKFDUT ͠Ύͬͪΐ͏͹Μ