WebFluxでコルーチン #m3kt

Transcript

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

2. 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！

3. 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 } }

4. 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 } }

5. 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 } }

6. 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 } }

7. 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 } }

8. 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 } }

9. WebFlux @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle():

   Mono<String> = 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')

10. WebFlux @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle():

    Mono<String> = 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')

11. @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono<String>

    = 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')

12. @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono<String>

    = 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')

13. @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono<String>

    = 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')

14. @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle(): Mono<String>

    = 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')

15. Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle():

    Mono<String> = 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'

16. Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle():

    Mono<String> = 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'

17. Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle():

    Mono<String> = 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'

18. Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle():

    Mono<String> = 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'

19. Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle():

    Mono<String> = 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'

20. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

21. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

22. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

23. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

24. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

25. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

26. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

27. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }

28. Channelで遊ぶ @RestController class DemoController { private val ch = Channel<String>()

    @GetMapping("read") fun read() = publish { while(isActive) send(ch.receive()) } @GetMapping("write/{msg}") fun write(@PathVariable msg: String) = mono { ch.send(msg) msg } }
29. None
30. None

31. 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'

32. 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'

33. Reactorでコルーチン @RestController class DemoController(val demoService: DemoService) { @GetMapping("demo") fun handle():

    Mono<String> = 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'

34. 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！