'3&4)ϓϩδΣΫτʗ 4FSWFS4JEF,PUMJO׆༻ࣄྫ $"LU ໺ᖒ૱࢙!TPVTIJ@OP[BXB

BCPVUNF w αʔόαΠυΤϯδχΞ w ʙ'3&4)ॴଐLUྺ @soushi_nozawa @soushin blog.soushi.me

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ੜ์ૹಈըϓϥοτϑΥʔϜ .JDSPTFSWJDFT"SDIJUFDUVSF'VMM%PDLFSOJ[FE"NB[PO8FC4FSWJDFT

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'3&4)ͱαʔόαΠυͱ,PUMJO w ʙ͜Ε·Ͱ༷ʑͳϚΠΫϩαʔϏεʹ,PUMJOΛಋೖ w ܾࡁूܭɺΞφϦςΟΫεɺϓογϡ௨஌ɺϩάऩूɺ"1*ήʔτ ΢ΣΠɺγεςϜج൫ͳͲ w ϲ݄ʹ̍ͭͷϖʔεͰ৽͍͠ϚΠΫϩαʔϏεΛϦϦʔε w εΫϥοϓˍϏϧυͰߦਐ͢Δ'3&4)։ൃମ੍΋ޙԡ͠ w ༷ʑͳγεςϜཁ݅ʹॊೈʹରԠͰ͖͍ͯΔ

ϚΠΫϩαʔϏεͱH31$ w ̍ͭͷϚΠΫϩαʔϏεʹ̍ͭͷϨϙδτϦɺ̍ͭͷϦιʔεʢ%#ʣ͕ίϯηϓτ w ̍ͭͷϚΠΫϩαʔϏεʹ(MPCBMͱ*OUFSOBMͷH31$4FSWFSΛىಈ͢Δ w 1PSUͰH31$4FSWFSΛ෼͚ͯ1VCMJDʗ1SJWBUFͷΞΫηεΛ੍ݶ͢Δ

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3FJpFEUZQFQBSBNFUFST 1 data class RequestCreateTask(val title: String, 2 val description: String) 3 4 object Validator { 5 fun validBody(req: ServerRequest): RequestCreateTask = 6 try { 7 req.bodyToMono(RequestCreateTask::class.java).block() 8 ?: throw BadRequestException("invalid body") 9 } catch (e: DecodingException) { 10 throw BadRequestException("decoding error") 11 } 12 } w 3FRVFTU$SFBUF5BTL͔͠ػೳ͠ͳ͍7BMJEBUPS

1 object Validator { 2 inline fun validBody(req: ServerRequest): T = 3 try { 4 req.bodyToMono(T::class.java).block() 5 ?: throw BadRequestException("invalid body") 6 } catch (e: DecodingException) { 7 throw BadRequestException("decoding error") 8 } 9 } 3FJpFEUZQFQBSBNFUFST w SFJpFEΛ͔ͭ͏͜ͱͰίʔυதͷܕύϥϝʔλ5ʹΞΫηεͰ͖Δ w ܕΛݶఆ͢Δ͜ͱͳ͍൚༻ؔ਺΁վળͰ͖ͨ

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5ZQF"MJBT 1 interface AppClient { 2 fun verifyReceipt(req: Req): Res 3 } 4 5 @Service 6 class AppService( 7 private val appStoreCli: AppClient, 8 private val andAppCli: AppClient) w "QQ4UPSFͳͷ͔(PPHMF1MBZͳͷ͔ܕ͔Β$MJFOU͕൑அ͠ʹ͍͘

5ZQF"MJBT 1 typealias AppStoreCli = AppClient 2 typealias AndAppCli = AppClient 3 4 @Service 5 class AppService( 6 private val appStoreCli: AppStoreCli, 7 private val andAppCli: AndAppCli) w ܕʹผ໊Λ͚ͭͯݟ௨͕͠ྑ͘ͳͬͨ

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3PVUFS'VODUJPO%4- 1 @Configuration 2 class Routes(private val taskHandler: TaskHandler, 3 private val authFilter: AuthFilter) { 4 @Bean 5 fun apis() = router { 6 (accept(MediaType.APPLICATION_JSON) and "/tasks").nest { 7 GET("/{id}", taskHandler::getTask) 8 POST("/", taskHandler::postTask) 9 } 10 }.filter(authFilter) 11 } w 4QSJOH͔Βͷ৽ػೳͰ"1*ϧʔςΟϯάͷ%4- w "1*ͷϝΠϯॲཧ͸)BOEMFSΛ࡞Γؔ਺ࢀরͰҾ਺ͱͯ͠౉͢ͷ͕Φεεϝ

3PVUFS'VODUJPO%4- 1 @Component 2 class TaskHandler(private val taskRepository: TaskRepository) { 3 4 fun getTask(req: ServerRequest): Mono = 5 (req.pathVariable("id").toLongOrNull() 6 ?: throw WebAppException.BadRequestException("required id")).let { 7 ServerResponse.ok().json().body(Mono.just(taskRepository.getTaskById(it))) 8 } 9 10 fun postTask(req: ServerRequest): Mono = 11 Validator.validBody(req).let { 12 taskRepository.createTask(it.title, it.description).let { 13 ServerResponse.ok().json().body(Mono.just(it)) 14 } 15 } 16 } (ServerRequest) -> Mono w UBTL"1*ͷ5BTL)BOEMFSΫϥε w SFR4FSWFS3FRVFTU ΛҾ਺ʹ.POP4FSWFS3FTQPOTFΛฦؔ͢਺͕ฒͿ

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1 // src/main/java/app/dao/TaskDao.java 2 3 @ConfigAutowireable 4 @Dao 5 public interface TaskDao { 6 @Select 7 Task selectById(Long id); 8 } %PNB 1 // src/main/resources/META-INF/app/dao/TaskDao/selectById.sql 2 3 SELECT * FROM task WHERE task_id = /*id*/0 w 42-ςϯϓϨʔτͱ%BPΫϥεͷϚοϐϯά

%PNB 1 @Entity(immutable = true) 2 @Table(name = "task") 3 data class Task( 4 @Id 5 @GeneratedValue(strategy = GenerationType.IDENTITY) 6 @Column(name = "task_id") 7 val id: Int? = null, 8 @Column(name = "title") 9 val title: String, 10 @Column(name = "finished_at") 11 val finishedAt: LocalDateTime?, 12 @Column(name = "created_at") 13 val createdAt: LocalDateTime, 14 @Column(name = "updated_at") 15 val updatedAt: LocalDateTime 16 ) w ΤϯςΟςΟ͸EBUBDMBTTͰఆٛ͢Δ w ΧϥϜ͕OVMMBCMFͰ͋Δ͔໌֬ʹ൑ผͰ͖Δ

%PNB 1 @Repository 2 class TaskRepository(val dao: TaskDao) { 3 4 fun updateById(id: Long, title: String) { 5 val entity = dao.selectById(id) ?: 6 throw RepositoryException.NotFoundException("not found") 7 val now = LocalDateTime.now() 8 dao.update(entity.copy(title = title, updatedAt = now)).let { 9 if (it == 0) 10 throw RepositoryException.UpdateNotFoundException("not found") 11 } 12 } 13 } w EBUBDMBTTͷDPQZ Λ࢖͍ߋ৽ΧϥϜΛ໌֬ʹ

%PNB 1 class TaskFactory(private val config: Config) { 2 3 fun selectByTitle(title: String) { 4 val builder = SelectBuilder.newInstance(config) 5 .sql("SELECT * FROM task") 6 .sql("WHERE") 7 .sql("title =").param(String::class.java, "My Task") 8 builder.getEntityResultList(Task::class.java) 9 } 10 } w %BPςετέʔεʹԠͯ͡σʔλऔಘͷݕূΛ͢ΔͨΊͷ'BDUPSZΫϥε w %BPςετͰؾܰʹ42-Λྲྀ͍ͨ͠ͱ͖͸4FMFDU#VJMEFS͕ศར w SFJpFEͱ֦ுؔ਺ΛೖΕΔػӡ

%PNB 1 // SelectBuilderExt.kt 2 3 inline fun SelectBuilder.param(param: T) = 4 param(T::class.java, param) 5 6 fun SelectBuilder.getEntityResultList(rClass: KClass) = 7 getEntitySingleResult(rClass.java) w QBSBNؔ਺͸3FJpFEΛ͔͍ͭ42-ΫΤϦύϥϝʔλͷҾ਺͕͚̍ͭͩʹ͢Δ w HFU&OUJUZ3FTVMU-JTUؔ਺͸,PUMJOΫϥεΛҾ਺ʹ͢Δ

%PNB 1 class TaskFactory(private val config: Config) { 2 3 fun selectByTitle(title: String) { 4 val builder = SelectBuilder.newInstance(config) 5 .sql("SELECT * FROM task") 6 .sql("WHERE") 7 .sql("title =").param("My Task") 8 builder.getEntityResultList(Task::class) 9 } 10 } w QBSBN HFU&OUJUZ3FTVMU-JTU ͕εοΩϦ w ֦ுؔ਺Λ૊Έ߹ΘͤͯίʔυΛվળ͢Δָ͕͠͞,PUMJOʹ͸͋Δ

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6OJU5FTUJOH w ৄࡉ͸ϒϩάʹ·ͱΊͯ͋Γ·͢ w ʮ,PUMJOͰ.PDLςετͷ·ͱΊʯ w IUUQCMPHTPVTIJNFFOUSZ

"1*%PDVNFOUBUJPO w 4QSJOH'PY 4XBHHFS ɺ4QSJOH3FTU%PDT͸࢖͑ͳ͍ w 4QSJOH#PPU͸αϙʔτͰ͖͍ͯͳ͍ w BQJ%PDͰ"1*࢓༷υΩϡϝϯτΛੜ੒ w IUUQBQJEPDKTDPN w *OMJOF%PDVNFOUBUJPOGPS3&45GVMXFC"1*T w ͲΜͳݴޠͰ΋ಋೖ͠΍͍͢ w H31$͸QSPUPHFOEPDΛ͔ͭ͏

"1*%PDVNFOUBUJPO w ৄࡉ͸ϒϩάʹ·ͱΊͯ͋Γ·͢ w ʮ4QSJOH#PPUͱBQJ%PDΛ࿈ܞͤͯ͞Έ ͨ w IUUQCMPHTPVTIJNFFOUSZ

·ͱΊ w 4QSJOH#PPU,PUMJOH31$ߏ੒ɺ໰୊ͳ͘Քಇ w FRESH!ϓϩδΣΫτ͸௅ઓΛଓ͚·͢ w ,PUMJOΒ͍͠ίʔυΛٻΊͯ։ൃ͢Δͱָ͍͠ w 3FJpFEUZQFQBSBNFUFS֦ுؔ਺ͳͲ w 5FTU"QJ%PDํ໘ͷ७ਖ਼,PUMJO-JCSBSZͷొ৔΍੒ख़ʹظ଴ w ϒϩάͰ,PUMJO H31$ؔ࿈ͷΞ΢τϓοτΛܧଓ͠·͢

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