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WebFluxでコルーチン 2017-11-22 どこでもKotlin #4 長澤太郎 @ngsw_taro

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自己紹介 ● 長澤 太郎（たろーって呼んでね） ● @ngsw_taro ● エムスリー株式会社 ● ディズニーが大好き！

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従来のスタイル @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): String { val itemA = demoService.getItemA() val itemB = demoService.getItemB() val itemC = demoService.getItemC(itemA, itemB) return itemC.answer } }

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従来のスタイル @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): String { val itemA = demoService.getItemA() val itemB = demoService.getItemB() val itemC = demoService.getItemC(itemA, itemB) return itemC.answer } }

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従来のスタイル @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): String { val itemA = demoService.getItemA() val itemB = demoService.getItemB() val itemC = demoService.getItemC(itemA, itemB) return itemC.answer } }

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従来のスタイル @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): String { val itemA = demoService.getItemA() val itemB = demoService.getItemB() val itemC = demoService.getItemC(itemA, itemB) return itemC.answer } }

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従来のスタイル @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): String { val itemA = demoService.getItemA() val itemB = demoService.getItemB() val itemC = demoService.getItemC(itemA, itemB) return itemC.answer } }

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従来のスタイル @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): String { val itemA = demoService.getItemA() val itemB = demoService.getItemB() val itemC = demoService.getItemC(itemA, itemB) return itemC.answer } }

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WebFlux @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = Mono.zip( demoService.getMonoA(), demoService.getMonoB() ) .flatMap { demoService.getMonoC(it.t1, it.t2) } .map { it.answer } } // dependencies compile('org.springframework.boot:spring-boot-starter-webflux')

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WebFlux @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = Mono.zip( demoService.getMonoA(), demoService.getMonoB() ) .flatMap { demoService.getMonoC(it.t1, it.t2) } .map { it.answer } } // dependencies compile('org.springframework.boot:spring-boot-starter-webflux')

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@RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = Mono.zip( demoService.getMonoA(), demoService.getMonoB() ) .flatMap { demoService.getMonoC(it.t1, it.t2) } .map { it.answer } } WebFlux // dependencies compile('org.springframework.boot:spring-boot-starter-webflux')

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@RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = Mono.zip( demoService.getMonoA(), demoService.getMonoB() ) .flatMap { demoService.getMonoC(it.t1, it.t2) } .map { it.answer } } WebFlux // dependencies compile('org.springframework.boot:spring-boot-starter-webflux')

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@RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = Mono.zip( demoService.getMonoA(), demoService.getMonoB() ) .flatMap { demoService.getMonoC(it.t1, it.t2) } .map { it.answer } } WebFlux // dependencies compile('org.springframework.boot:spring-boot-starter-webflux')

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@RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = Mono.zip( demoService.getMonoA(), demoService.getMonoB() ) .flatMap { demoService.getMonoC(it.t1, it.t2) } .map { it.answer } } WebFlux // dependencies compile('org.springframework.boot:spring-boot-starter-webflux')

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Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = mono { val a = async { demoService.getItemA() } val b = async { demoService.getItemB() } val c = async { demoService.getItemC(a.await(), b.await()) } c.await().answer } } // dependencies compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:0.19.3' compile 'org.jetbrains.kotlinx:kotlinx-coroutines-reactor:0.19.3'

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Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = mono { val a = async { demoService.getItemA() } val b = async { demoService.getItemB() } val c = async { demoService.getItemC(a.await(), b.await()) } c.await().answer } } // dependencies compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:0.19.3' compile 'org.jetbrains.kotlinx:kotlinx-coroutines-reactor:0.19.3'

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Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = mono { val a = async { demoService.getItemA() } val b = async { demoService.getItemB() } val c = async { demoService.getItemC(a.await(), b.await()) } c.await().answer } } // dependencies compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:0.19.3' compile 'org.jetbrains.kotlinx:kotlinx-coroutines-reactor:0.19.3'

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Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = mono { val a = async { demoService.getItemA() } val b = async { demoService.getItemB() } val c = async { demoService.getItemC(a.await(), b.await()) } c.await().answer } } // dependencies compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:0.19.3' compile 'org.jetbrains.kotlinx:kotlinx-coroutines-reactor:0.19.3'

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Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = mono { val a = async { demoService.getItemA() } val b = async { demoService.getItemB() } val c = async { demoService.getItemC(a.await(), b.await()) } c.await().answer } } // dependencies compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:0.19.3' compile 'org.jetbrains.kotlinx:kotlinx-coroutines-reactor:0.19.3'

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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Channelで遊ぶ @RestController class DemoController { private val ch = Channel() @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

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ハンドラがサスペンド @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") suspend fun handle():String { val a = async { demoService.getItemA() } val b = async { demoService.getItemB() } val c = async { demoService.getItemC(a.await(), b.await()) } return c.await().answer } } // dependencies compile 'org.springframework.kotlin:spring-webflux-kotlin-coroutine:0.3.1'

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ハンドラがサスペンド @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") suspend fun handle():String { val a = async { demoService.getItemA() } val b = async { demoService.getItemB() } val c = async { demoService.getItemC(a.await(), b.await()) } return c.await().answer } } // dependencies compile 'org.springframework.kotlin:spring-webflux-kotlin-coroutine:0.3.1'

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Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono = mono { val a = async { demoService.getItemA() } val b = async { demoService.getItemB() } val c = async { demoService.getItemC(a.await(), b.await()) } c.await().answer } } // dependencies compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core:0.19.3' compile 'org.jetbrains.kotlinx:kotlinx-coroutines-reactor:0.19.3'

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まとめ ● WebFluxはノンブロッキングでいいね！ ● ReactorはFutureやストリームみたいなやつを簡単に扱うこと ができるよ！ ● コルーチンは素直に非同期処理を書き下せていいね！