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WebFluxでコルーチン #m3kt
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Taro Nagasawa
November 27, 2017
Programming
2
750
WebFluxでコルーチン #m3kt
どこでもKotlin #4 (
https://m3-engineer.connpass.com/event/70561/
)で発表したスライドです。
Taro Nagasawa
November 27, 2017
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Transcript
WebFluxでコルーチン 2017-11-22 どこでもKotlin #4 長澤太郎 @ngsw_taro
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!
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 } }
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 } }
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 } }
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 } }
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 } }
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 } }
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')
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')
@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')
@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')
@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')
@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')
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'
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'
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'
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'
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'
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 } }
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 } }
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 } }
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 } }
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 } }
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 } }
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 } }
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 } }
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 } }
None
None
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'
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'
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'
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!