Akkaちゃんと遊ぼう！ Akka Streams で作るリアルタイムサーバ #scalafukuoka / Implement stream server with Akka Streams and WebSocket

"LLBͪΌΜͱ༡΅͏ʂ "LLB4USFBNTͰ࡞ΔϦΞϧλΠϜαʔό TDBMBGVLVPLB

ࣗݾ঺հ w ࿨ా༞հ w ೥݄೔ w ۀ຿4DBMB 1MBZ w
5XJUUFS!XBEEZ@V w झຯ૲໺ٿ  ɹɹɹΠΧͷ΍ͭ ৽ࢀ

࿩͢಺༰ w "LLB4USFBNTΛ࢖ͬͯΈͨΜͰ͢Α w άϥϑΛ࡞࣮ͬͯߦͯ͠ΈΑ͏ w 1MBZΛ࢖ͬͯ8FC4PDLFUͷόοΫΤϯυʹ͠Α͏ w Կͭ͘Γ͍ͨʁ1VCMJTI4VCTDSJCFΛࢧ͑Δ෦඼
w จࣈνϟοτΛ࡞ͬͯΈΑ͏ w ϏσΦνϟοτΛ࡞ͬͯΈΑ͏ w ΦϯϥΠϯήʔϜαʔόΛ࡞ͬͯΈΑ͏ w ·ͱΊ NJO NJO NJO NJO NJO NJO NJO NJO

w "LLB4USFBNTΛ࢖ͬͯΈͨΜͰ͢Α w άϥϑΛ࡞࣮ͬͯߦͯ͠ΈΑ͏ w 1MBZΛ࢖ͬͯ8FC4PDLFUͷόοΫΤϯυʹ͠Α͏ w Կͭ͘Γ͍ͨʁ1VCMJTI4VCTDSJCFΛࢧ͑Δ෦඼ w
จࣈνϟοτΛ࡞ͬͯΈΑ͏ w ϏσΦνϟοτΛ࡞ͬͯΈΑ͏ w ΦϯϥΠϯήʔϜαʔόΛ࡞ͬͯΈΑ͏ w ·ͱΊ NJO

"LLBͪΌΜͷಛ௃ฒྻ෼ࢄॲཧϥΠϒϥϦ܈ "DUPST $MVTUFS 1FSTJTUFODF 4USFBNT )551
ϚϧνεϨουʹ୅ΘΔ৽͍͠ॲཧͷ࣮ߦ୯Ґ ϩʔΧϧʗϦϞʔτ໰Θͣ࢓ࣄΛ౤͛Δͱྑ͍ײ͡ʹॲཧͯ͘͠Ε Δʮ"DPUSͷू·ΓʯΛͭ͘Γ͋͛Δ "DUPSͷঢ়ଶΛӬଓԽ͢ΔͨΊͷ࢓૊ΈɻॲཧΛ੥͚ෛ͍ͬͯͨ "DUPS͕Τϥʔʹͳͬͯ͠·ͬͨ৔߹ɺผͷ"DUPS͕Ҿ͖ܧ͛Δ σʔλͷ։࢝ͱऴ͕ྃఆٛ͞Ε͍ͳ͍λΠϓͷ࢓ࣄʢετϦʔϛϯ άαʔϏεʣΛ͜ͳͨ͢Ίͷ෦඼܈ )551ͱ্ड़ͷΑ͏ͳ࢓૊ΈΛόοΫΤϯυͱͯͭ͠ͳ͙

"LLBͪΌΜͷಛ௃"LLB4USFBNT͕࢖͑Δ "DUPST $MVTUFS 1FSTJTUFODF 4USFBNT )551
ϚϧνεϨουʹ୅ΘΔ৽͍͠ॲཧͷ࣮ߦ୯Ґ ϩʔΧϧʗϦϞʔτ໰Θͣ࢓ࣄΛ౤͛Δͱྑ͍ײ͡ʹॲཧͯ͘͠Ε Δʮ"DPUSͷू·ΓʯΛͭ͘Γ͋͛Δ "DUPSͷঢ়ଶΛӬଓԽ͢ΔͨΊͷ࢓૊ΈɻॲཧΛ੥͚ෛ͍ͬͯͨ "DUPS͕Τϥʔʹͳͬͯ͠·ͬͨ৔߹ɺผͷ"DUPS͕Ҿ͖ܧ͛Δ σʔλͷ։࢝ͱऴ͕ྃఆٛ͞Ε͍ͳ͍λΠϓͷ࢓ࣄʢετϦʔϛϯ άαʔϏεʣΛ͜ͳͨ͢Ίͷ෦඼܈ )551ͱ্ड़ͷΑ͏ͳ࢓૊ΈΛόοΫΤϯυͱͯͭ͠ͳ͙

"LLBͪΌΜͷಛ௃"LLB4USFBNT͕࢖͑Δ 4USFBNT σʔλͷ։࢝ͱऴ͕ྃఆٛ͞Ε͍ͳ͍λΠϓͷ࢓ࣄʢετϦʔϛϯ άαʔϏεʣΛ͜ͳͨ͢Ίͷ෦඼܈

"LLBͪΌΜͷಛ௃"LLB4USFBNT͕࢖͑Δ 4USFBNT σʔλͷ։࢝ͱऴ͕ྃఆٛ͞Ε͍ͳ͍λΠϓͷ࢓ࣄʢετϦʔϛϯ άαʔϏεʣΛ͜ͳͨ͢Ίͷ෦඼܈ manuzhang/awesome-streaming: a curated list
of awesome streaming frameworks, applications, etc https://github.com/ manuzhang/awesome-streaming وॏͳετϦʔϛϯάϥΠϒϥϦ

"LLBͪΌΜͷಛ௃"LLB4USFBNT͕࢖͑Δ 4USFBNT σʔλͷ։࢝ͱऴ͕ྃఆٛ͞Ε͍ͳ͍λΠϓͷ࢓ࣄʢετϦʔϛϯ άαʔϏεʣΛ͜ͳͨ͢Ίͷ෦඼܈ وॏͳετϦʔϛϯάϥΠϒϥϦ ετϦʔϛϯάόοΫΤϯυΛߏ
ஙͰ͖Δͱ৭ʑͱԠ༻͕ޮ͘ͷͰ ͸ʂʁ Streaming Req/Res Service Batch

ஙͰ͖Δͱ৭ʑͱԠ༻͕ޮ͘ͷͰ ͸ʂʁ ྲྀΕདྷͯΔ Google Trend “Akka Streams”

ஙͰ͖Δͱ৭ʑͱԠ༻͕ޮ͘ͷͰ ͸ʂʁ ྲྀΕདྷͯΔ Google Trend “Akka Streams” ͔ͳΓΠέͯΔϥΠϒϥϦͳͷ͸ ؒҧ͍ͳ͍Μ͚ͩΕͲ΋

"LLBͪΌΜͷಛ௃ͱ͖ͬͭʹ͍͘ ӳޠ͹͔ͬ΍Μ͚ʂ http://doc.akka.io/docs/akka/current/scala/guide/introduction.html http://freecontent.manning.com/akka-in-action-why-use-clustering/

গ͠Ͱ΋਌͠ΈΛ࣋ͬͯཉ͍͠

Akka Streams ͱ͸!! Έ͍ͨͳ࿩Λ͢ΔΑΓ΋

श͏ΑΓ׳ΕΖਫ਼ਆ

ʮ͜Μͳ΋ͷ΋࡞ΕͨΑʂʯ

଱ো֐ੑ ύϑΥʔϚϯε ߴՄ༻ੑ Messageۦಈͱ͸ Έ͍ͨͳ࿩͸Ұ੾͋Γ·ͤΜ

ετϦʔϜॲཧͷߟ͑ํ ҰൠతʹετϦʔϜͱ͍͑͹ σʔλൃੜݯ 4PVSDF σʔλड৴ऀ 4JOL σʔλ੍ޚ
'MPX ͜ΕΒͷ࢓ࣄΛ΍Δਓ͕͍Ε͹ͳΜͱ͔ͳΔ "LLB4USFBNTʹ͓͍ͯ͸Ͳ͏͍͏ѻ͍͔ʁ

෦඼Λ૊Έ߹ΘͤͯάϥϑΛ࡞ΔήʔϜ "LLB4USFBNTͰετϦʔϜॲཧΛఆٛ͢Δ৔߹ɿ ෦඼Λ૊Έ߹ΘͤͯάϥϑΛ࡞Δɻ ࡞ͬͨάϥϑΛ࣮ߦ͢Δɻ

͋ͷ͊͞ ͓·͑͸ҰମԿΛݴ͍ͬͯΔΜͩ

ίʔυϕʔεͰݟ͍͖ͯ·͢ʂ $ sbt new playframework/play-scala-seed.g8 [info] Loading global plugins
from /Users/wada.yusuke/.sbt/0.13/plugins [info] Set current project to developers-io-2017 (in build file:/Users/ wada.yusuke/.ghq/github.com/cm-wada-yusuke/developers-io-2017/) This template generates a Play Scala project name [play-scala-seed]: akka-streams-starter organization [com.example]: scalatestplusplay_version [3.1.1]: play_version [2.6.2]: Template applied in ./akka-streams-starter

ίʔυϕʔεͰݟ͍͖ͯ·͢ʂ $ sbt new playframework/play-scala-seed.g8 [info] Loading global plugins
from /Users/wada.yusuke/.sbt/0.13/plugins [info] Set current project to developers-io-2017 (in build file:/Users/ wada.yusuke/.ghq/github.com/cm-wada-yusuke/developers-io-2017/) This template generates a Play Scala project name [play-scala-seed]: akka-streams-starter organization [com.example]: scalatestplusplay_version [3.1.1]: play_version [2.6.2]: Template applied in ./akka-streams-starter 1MBZʹ͸BLLB͕ಉࠝ͞Ε͍ͯ·͢

ͷഒ਺Λग़ྗ͢ΔΑ͏ͳάϥϑΛ࡞Ε import akka.actor.ActorSystem import akka.stream.ActorMaterializer import akka.stream.scaladsl.{ Flow, Sink,
Source } object StreamApplication { implicit val as = ActorSystem() implicit val mat = ActorMaterializer() def main(args: Array[String]): Unit = { val source = Source(1 to 100) val flow = Flow.fromFunction[Int, Int](_ * 3) val sink = Sink.foreach(println) val graph = source.via(flow).to(sink) graph.run() } }

ͷഒ਺Λग़ྗ͢ΔΑ͏ͳάϥϑΛ࡞Ε import akka.actor.ActorSystem import akka.stream.ActorMaterializer import akka.stream.scaladsl.{ Flow, Sink,
Source } object StreamApplication { implicit val as = ActorSystem() implicit val mat = ActorMaterializer() def main(args: Array[String]): Unit = { val source = Source(1 to 100) val flow = Flow.fromFunction[Int, Int](_ * 3) val sink = Sink.foreach(println) val graph = source.via(flow).to(sink) graph.run() } } TCUlSVO.BJO4USFBN"QQMJDBUJPOz ʜ

Source ͔Β Sink ·Ͱ ͭͳ͕ͬͨάϥϑΛ࣮ߦͰ͖Δ͜ͱ͸ Θ͔ͬͨ ͜͜·Ͱ΍ͬͯΈͯ

֎ͷੈք ͭ·ΓΫϥΠΞϯτͱͭͳ͛ͳ͍͔ʁ ͜͜·Ͱ΍ͬͯΈͯ

֎෦͔ΒͷΞΫηεʹର͢ΔॲཧΛετϦʔϜͰ 8FC4PDLFU͕࢖͑ͦ͏ ΫϥΠΞϯτͱαʔόͷ૒ํ޲௨৴Λ࣮ݱ͢ΔͨΊͷن֨ɻ σʔλૹड৴ʹ͓͍ͯετϦʔϜॲཧͱ૬ੑ͕ྑͦ͞͏ɻ 1MBZͰαϙʔτ͞Ε͍ͯΔ ਆ

ઌఔͭͬͨ͘ϓϩδΣΫτͰૣ଎ࢼ͢ package controllers import javax.inject.Inject import play.api.mvc._ class WebSocketController
@Inject()(cc: ControllerComponents) extends AbstractController(cc) { def connect() = WebSocket.accept { // ͜͜ʹԿΛॻ͚͹Α͍͔ } }

8FC4PDLFUBDDFQUͷఆٛΛݟͯΈΔ /** * Accepts a WebSocket using the given
flow. */ def accept[In, Out](f: RequestHeader => Flow[In, Out, _])(implicit transformer: MessageFlowTransformer[In, Out]): WebSocket

8FC4PDLFUBDDFQUͷఆٛΛݟͯΈΔ /** * Accepts a WebSocket using the given
flow. */ def accept[In, Out](f: RequestHeader => Flow[In, Out, _])(implicit transformer: MessageFlowTransformer[In, Out]): WebSocket "LLB4USFBNTͷ 'MPXΛཁٻ͍ͯ͠Δʂ

ઌఔͭͬͨ͘ϓϩδΣΫτͰૣ଎ࢼ͢ package controllers import javax.inject.Inject import akka.stream.scaladsl.Flow import play.api.mvc._
class WebSocketController @Inject()(cc: ControllerComponents) extends AbstractController(cc) { def connect() = WebSocket.accept[String, String] { req => Flow.fromFunction(txt => s"flow passed! $txt") } }

1MBZͱ"LLB4USFBNTΛ࢖ͬͯ WebSocket ͷόοΫΤϯυΛ ߏஙͰ͖Δ͜ͱ͕Θ͔ͬͨʂ

w จࣈνϟοτΛ࡞ͬͯΈΑ͏ w ϏσΦνϟοτΛ࡞ͬͯΈΑ͏ w ΦϯϥΠϯήʔϜαʔόΛ࡞ͬͯΈΑ͏ w ·ͱΊ NJO

WebSocket ͱ Akka Streams Λ࢖ͬͯɺԿ͔ͭ͘Γ͍ͨ

ͻͱΓͷཁٻʹରͯ͠ ετϦʔϜॲཧΛߦ͏ͷ͸ REST ͱͦΜͳʹมΘΒͳ͍

ଟରଟ ϦΞϧλΠϜ௨৴Λ࣮ݱ͢Δ αʔόΛ࣮૷Ͱ͖ͳ͍͔ʁ

ͭ·Γ͜ΜͳΠϝʔδ

ͭ·Γ͜ΜͳΠϝʔδ Publish / Subscribe νϟωϧΛ࡞Γ͍ͨʂ

"LLB4USFBNTͰ1VCMJTI4VCTDSJCFνϟωϧ ͜͜Ͱ՝୊͕ੜ͡Δ "LLB4USFBNTͱ͸ʮ෦඼Λ૊Έ߹ΘͤͯάϥϑΛ࡞Δήʔ ϜʯͩͬͨɻઌఔͷྫͰ͸8FC4PDLFUͰ'MPXʹܨ͍ͩॠ ؒɺάϥϑ͕׬੒͢Δɻͭ·Γʜ

"LLB4USFBNTͰ1VCMJTI4VCTDSJCFνϟωϧ ͜͜Ͱ՝୊͕ੜ͡Δ "LLB4USFBNTͱ͸ʮ෦඼Λ૊Έ߹ΘͤͯάϥϑΛ࡞Δήʔ ϜʯͩͬͨɻઌఔͷྫͰ͸8FC4PDLFUͰ'MPXʹܨ͍ͩॠ ؒɺάϥϑ͕׬੒͢Δɻͭ·Γʜ ͭͳ͍ͩਓ͝ͱʹ άϥϑ͕Ͱ͖Δ͚ͩ ʗ ?P?
ʘ

"LLB4USFBNTͰ1VCMJTI4VCTDSJCFνϟωϧ զʑ͕ཉ͍͠෦඼ 8FC4PDLFUͰ઀ଓ͢Δ͝ͱʹ*O0VU͕૿͑ɺͳ͓͔ͭಉ͡ 'MPXʹ઀ଓ͍ͯ͠ΔΫϥΠΞϯτʹϒϩʔυΩϟετͰ͖Δ෦඼

"LLB4USFBNTͰ1VCMJTI4VCTDSJCFνϟωϧ զʑ͕ཉ͍͠෦඼ 8FC4PDLFUͰ઀ଓ͢Δ͝ͱʹ*O0VU͕૿͑ɺͳ͓͔ͭಉ͡ 'MPXʹ઀ଓ͍ͯ͠ΔΫϥΠΞϯτʹϒϩʔυΩϟετͰ͖Δ෦඼ !?

"LLB4USFBNTͰ1VCMJTI4VCTDSJCFνϟωϧ զʑ͕ཉ͍͠෦඼ 8FC4PDLFUͰ઀ଓ͢Δ͝ͱʹ*O0VU͕૿͑ɺͳ͓͔ͭಉ͡ 'MPXʹ઀ଓ͍ͯ͠ΔΫϥΠΞϯτʹϒϩʔυΩϟετͰ͖Δ෦඼

"LLB4USFBNTͰ1VCMJTI4VCTDSJCFνϟωϧ զʑ͕ཉ͍͠෦඼ 8FC4PDLFUͰ઀ଓ͢Δ͝ͱʹ*O0VU͕૿͑ɺͳ͓͔ͭಉ͡ 'MPXʹ઀ଓ͍ͯ͠ΔΫϥΠΞϯτʹϒϩʔυΩϟετͰ͖Δ෦඼ !!

MergeHub BroadcastHub

MergeHub BroadcastHub are God

.FSHF)VC#SPBEDBTU)VC .FSHF)VC ".FSHF)VCBMMPXTUPJNQMFNFOUBEZOBNJDGBOJO KVODUJPOQPJOUJOBHSBQIXIFSFFMFNFOUTDPNJOHGSPN EJ⒎FSFOUQSPEVDFSTBSFFNJUUFEJOB'JSTU$PNFT'JSTU 4FSWFEGBTIJPO #SPBEDBTU)VC "#SPBEDBTU)VCDBOCFVTFEUPDPOTVNFFMFNFOUTGSPN BDPNNPOQSPEVDFSCZBEZOBNJDTFUPGDPOTVNFST
Dynamic stream handling • Akka Documentation http://doc.akka.io/docs/akka/current/scala/stream/stream-dynamic.html

ଟରଟͷςΩετૹड৴νϟωϧΛ࡞ͬͯΈΔ package controllers import javax.inject.Inject import akka.actor.ActorSystem import akka.stream.scaladsl.{
BroadcastHub, Flow, Keep, MergeHub, Sink } import akka.stream.{ ActorMaterializer, KillSwitches, UniqueKillSwitch } import play.api.mvc._ import scala.concurrent.duration._ class WebSocketController @Inject()(cc: ControllerComponents) extends AbstractController(cc) { def connect() = WebSocket.accept[String, String] { req => Flow.fromFunction(txt => s"flow passed! $txt") } def dynamic() = WebSocket.accept[String, String] { req => DynamicStream.publishSubscribeFlow } }

ଟରଟͷςΩετૹड৴νϟωϧΛ࡞ͬͯΈΔ package controllers import javax.inject.Inject import akka.actor.ActorSystem import akka.stream.scaladsl.{
BroadcastHub, Flow, Keep, MergeHub, Sink } import akka.stream.{ ActorMaterializer, KillSwitches, UniqueKillSwitch } import play.api.mvc._ import scala.concurrent.duration._ class WebSocketController @Inject()(cc: ControllerComponents) extends AbstractController(cc) { def connect() = WebSocket.accept[String, String] { req => Flow.fromFunction(txt => s"flow passed! $txt") } def dynamic() = WebSocket.accept[String, String] { req => DynamicStream.publishSubscribeFlow } } 1VCMJTI4VCTDSJCF 'MPX͕ཉ͍͠

ଟରଟͷςΩετૹड৴νϟωϧΛ࡞ͬͯΈΔ object DynamicStream { implicit val as = ActorSystem()
implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } }

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } .FSHF)VCͱ #SPBEDBTU)VCΛͭͳ͍Ͱ SVO͢Δͱ 4JOLͱ4PVSDF͕Ͱ͖Δ

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } RUN

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } ͭ·Γ͜ΕΛͭͳ͛͹…ʁ

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } 4USFBN͕ ٧·Βͳ͍Α͏ʹ ഉਫޱΛͭͳ͙

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } ͭͳ͍Ͱ'MPXΛ࡞Δ cc ͜Ε͕ϝοηʔδόεʹ

࣮ߦ object DynamicStream { implicit val as = ActorSystem()

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } XBEBͷೖྗ͕

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } ZVTVLFͷग़ྗʹʂ

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } ZVTVLFͷೖྗ͕

implicit val mat = ActorMaterializer() lazy val publishSubscribeFlow: Flow[String, String, UniqueKillSwitch] = { val (sink, source) = MergeHub.source[String](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 256))(Keep.both) .run() source.runWith(Sink.ignore) val busFlow: Flow[String, String, UniqueKillSwitch] = Flow.fromSinkAndSource(sink, source) .joinMat(KillSwitches.singleBidi[String, String])(Keep.right) .backpressureTimeout(3.seconds) busFlow } } XBEBͷग़ྗʹʂ

͋Εʁ

ɹ͜ΕνϟοτγεςϜ͕Ͱ͖ͨͷͰ͸ʁ

΋͏΄ͱΜͲͰ͖ͨ΋ಉવ 1VCMJTI4VCTDSJCFνϟωϧΛ࡞Δ͜ͱ͕Ͱ͖ͨ ͜ͷ෦඼ΛԠ༻༷͠ʑͳϦΞϧλΠϜαʔόΛͭ͘Δ ࢓૊Έ͕Ͱ͖͍ͯΔͷͰߟ͑Δ͜ͱ͸ߜΒΕΔ ԿΛྲྀ͔͢ Ͳ͏ྲྀ͔͢

΋͏΄ͱΜͲͰ͖ͨ΋ಉવ 1VCMJTI4VCTDSJCFνϟωϧΛ࡞Δ͜ͱ͕Ͱ͖ͨ ͜ͷ෦඼ΛԠ༻༷͠ʑͳϦΞϧλΠϜαʔόΛͭ͘Δ ࢓૊Έ͕Ͱ͖͍ͯΔͷͰߟ͑Δ͜ͱ͸ߜΒΕΔ ԿΛྲྀ͔͢νϟοτςΩετɺࢀՃɺ཭୤ Ͳ͏ྲྀ͔͢ೖྗΛͦͷ··ग़ྗʹྲྀ͚ͩ͢

จࣈνϟοτͷ࣮૷্ͷϙΠϯτ class ChatController @Inject()( implicit val system: ActorSystem, implicit
val materializer: Materializer, streamChatService: ChatService ) { def start(roomId: String) = WebSocket.accept[JsValue, JsValue] { request => val userName = request.queryString("user_name").headOption.getOrElse("anon") val userInput: Flow[JsValue, ChatMessage, _] = ActorFlow.actorRef[JsValue, ChatMessage] (out => ChatRequestActor.props(out, userName)) val room = streamChatService.start(roomId, userName) val userOutPut: Flow[ChatMessage, JsValue, _] = ActorFlow.actorRef[ChatMessage, JsValue] (out => ChatResponseActor.props(out,userName)) userInput.viaMat(room.bus)(Keep.right).viaMat(userOutPut)(Keep.right) } }

val materializer: Materializer, streamChatService: ChatService ) { def start(roomId: String) = WebSocket.accept[JsValue, JsValue] { request => val userName = request.queryString("user_name").headOption.getOrElse("anon") val userInput: Flow[JsValue, ChatMessage, _] = ActorFlow.actorRef[JsValue, ChatMessage] (out => ChatRequestActor.props(out, userName)) val room = streamChatService.start(roomId, userName) val userOutPut: Flow[ChatMessage, JsValue, _] = ActorFlow.actorRef[ChatMessage, JsValue] (out => ChatResponseActor.props(out,userName)) userInput.viaMat(room.bus)(Keep.right).viaMat(userOutPut)(Keep.right) } } 8FC4PDLFU*/+40/ ˣม׵ $IBOOFM*/$IBU.FTTBHF

val materializer: Materializer, streamChatService: ChatService ) { def start(roomId: String) = WebSocket.accept[JsValue, JsValue] { request => val userName = request.queryString("user_name").headOption.getOrElse("anon") val userInput: Flow[JsValue, ChatMessage, _] = ActorFlow.actorRef[JsValue, ChatMessage] (out => ChatRequestActor.props(out, userName)) val room = streamChatService.start(roomId, userName) val userOutPut: Flow[ChatMessage, JsValue, _] = ActorFlow.actorRef[ChatMessage, JsValue] (out => ChatResponseActor.props(out,userName)) userInput.viaMat(room.bus)(Keep.right).viaMat(userOutPut)(Keep.right) } } $IBOOFM065$IBU.FTTBHF ˣม׵ 8FC4PDLFU065+40/

val materializer: Materializer, streamChatService: ChatService ) { def start(roomId: String) = WebSocket.accept[JsValue, JsValue] { request => val userName = request.queryString("user_name").headOption.getOrElse("anon") val userInput: Flow[JsValue, ChatMessage, _] = ActorFlow.actorRef[JsValue, ChatMessage] (out => ChatRequestActor.props(out, userName)) val room = streamChatService.start(roomId, userName) val userOutPut: Flow[ChatMessage, JsValue, _] = ActorFlow.actorRef[ChatMessage, JsValue] (out => ChatResponseActor.props(out,userName)) userInput.viaMat(room.bus)(Keep.right).viaMat(userOutPut)(Keep.right) } }

จࣈνϟοτΛ"LLB4USFBNTͰ࣮૷ͨ͠ײ૝ 1VCMJTI4VCTDSJCFνϟωϧ΄΅ͦͷ··࢖͑Δ 8FC4PDLFUͰͭͳ͕Δ֎ͷੈք +40/ ͱɺνϟωϧ Ͱྲྀ͢ܕ $IBU.FTTBHF Λม׵͢Δ෦඼ 'MPX
Λ௥ Ճ͢Δ͜ͱͰνϟωϧ಺ͷܕΛอূͰ͖Δ ϑϩϯτΤϯυͷϦΞΫςΟϒϥΠϒϥϦͱ૬ੑ͕ྑ͍ ࠓճ͸"OHVMBS 3Y+4Λར༻

΄ͱΜͲจࣈνϟοτͱಉ͡ͱࢥ͍͖΍ʜ lਓz͝ͱʹνϟωϧ͕ඞཁʹͳΔ จࣈνϟοτ͸͢΂ͯͷσʔλΛͻͱͭͷίϯϙʔωϯτʹ ཏྻ͍͚ͯ͠͹Α͔͕ͬͨɺϏσΦσʔλ͸Ϣʔβݻ༗͔ͩ Βɻ ϝϯόʔදͷ؅ཧ͕৽ͨʹඞཁ όΠφϦσʔλͷऔಘ͓ΑͼσίʔυʢΫϥΠΞϯτʣ

ϏσΦνϟοτߏ੒֓؍

ϏσΦνϟοτߏ੒֓؍ ϒϥ΢βʹ͸ࢀՃऀ͝ͱͷWJEFPλά

ϏσΦνϟοτߏ੒֓؍ αʔόʔαΠυ͸ࢀՃऀ͝ͱͷ όΠφϦνϟωϧ

ϏσΦνϟοτߏ੒֓؍ ࢀՃऀ৘ใ͕ྲྀΕΔผͷνϟωϧ ϒϥ΢β։͍ͨΒࢀՃɺ ดͨ͡Β཭୤

΄ͱΜͲจࣈνϟοτͱಉ͡ͱࢥ͍͖΍ʜ lਓz͝ͱʹνϟϯωϧ͕ඞཁʹͳΔ จࣈνϟοτ͸͢΂ͯͷσʔλΛͻͱͭͷίϯϙʔωϯτʹ ཏྻ͍͚ͯ͠͹Α͔͕ͬͨɺϏσΦσʔλ͸Ϣʔβݻ༗͔ͩ Βɻ ϝϯόʔදͷ؅ཧ͕৽ͨʹඞཁ όΠφϦσʔλͷऔಘ͓ΑͼσίʔυʢΫϥΠΞϯτʣ

)5.-.FEJB4PVSDF&YUFOTJPOT όΠφϦσʔλΛϒϥ΢β"1*ܦ༝Ͱૢ࡞Ͱ͖Δ

)5.-.FEJB4PVSDF&YUFOTJPOT όΠφϦσʔλΛϒϥ΢β"1*ܦ༝Ͱૢ࡞Ͱ͖Δ ίϨΛνϟωϧʹྲྀ͢

ͲΜͳ΋ͷΛ࡞͔ͬͨ DEMO

ͲΜͳ΋ͷΛ࡞͔ͬͨ -PDBM4USFBN DEMO

ͲΜͳ΋ͷΛ࡞͔ͬͨ νϟωϧΛհͯ͠౉͖ͬͯͨ ࣗ෼ͷόΠφϦ DEMO

ͲΜͳ΋ͷΛ࡞͔ͬͨ νϟωϧΛհͯ͠౉͖ͬͯͨ 4͞ΜͷόΠφϦ DEMO

ͲΜͳ΋ͷΛ࡞͔ͬͨ νϟωϧΛհͯ͠౉͖ͬͯͨ ,͞ΜͷόΠφϦ DEMO

ϏσΦνϟοτΛ"LLB4USFBNTͰ࣮૷ͨ͠ײ૝ 1VCMJTI4VCTDSJCFνϟωϧ΄΅ͦͷ··࢖͑Δ ϑϩϯτΤϯυͷϦΞΫςΟϒϥΠϒϥϦͱ૬ੑ͕ྑ͍ ϝϯόʔͷ૿ݮʹԠͯ͡ಈతʹWJEFPλάΛ௥Ճɻ ΫϥΠΞϯταΠυͷ΄͏͕େม͕ͩͬͨɺͦΕͰ΋ .FEJB4PVSDF&YUFOTJPOTͰָ͕Ͱ͖ͨ΄͏ 8FC35$ͱ͸ผͷܗͰଟରଟͷϏσΦνϟοτΛ࣮૷ Ͱ͖Δ͜ͱ͕Θ͔ͬͨ

ΦϯϥΠϯϚϧόπήʔϜΛ࡞Δ͜ͱʹͨ͠ ήʔϜͷঢ়ଶΛӬଓԽ 3FEJTʹ+40/ͱͯ͠อଘ͢Δɻ lίϚϯυzͰήʔϜঢ়ଶΛߋ৽ )551 ͨͩσʔλΛྲྀ͚ͩ͢Ͱͳ͘ɺϩδοΫΛద༻͢Δɻ ӬଓԽͨ͠ঢ়ଶΛҰఆִؒͰૹग़ ྲྀΕͯ͘ΔσʔλΛͦͷ··ར༻͢Δ͜Ε·Ͱͱ͸ҟͳΔɻ

ήʔϜαʔόུ֓ਤ ϓϨΠϠʔ͸)551Ͱ$PNNBOEΛૹ৴͢Δ ήʔϜαʔό͸ήʔϜϩδοΫΛద༻͠3FEJTΛߋ৽͢Δ ήʔϜαʔό͸ҰఆִؒͰ3FEJTͷ(BNF4UBUVTΛૹग़͢Δ

ϓϨΠϠʔ͸)551Ͱ$PNNBOEΛૹ৴͢Δ ήʔϜαʔό͸ήʔϜϩδοΫΛద༻͠3FEJTΛߋ৽͢Δ ήʔϜαʔό͸ҰఆִؒͰ3FEJTͷ(BNF4UBUVTΛૹग़͢Δ ήʔϜαʔόུ֓ਤ νϟωϧΛհ͢͜ͱͰ ͢΂ͯͷϢʔβ͕ ಉ͡ήʔϜঢ়ଶΛड৴Ͱ͖Δ

ήʔϜαʔό࣮૷্ͷϙΠϯτ // Create bus parts. val (sink, source) =
MergeHub.source[GameMessage](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 1024))(Keep.both) .run() source.runWith(Sink.ignore) sink.runWith(Source.repeat(Frame).throttle(1, 1.second, 5, ThrottleMode.Shaping)) val channel = GameChannel(sink, source) val bus: Flow[GameMessage, GameMessage, UniqueKillSwitch] = Flow.fromSinkAndSource(channel.sink, channel.source) .joinMat(KillSwitches.singleBidi[GameMessage, GameMessage])(Keep.right) .backpressureTimeout(3.seconds) .map[GameMessage] { case j: Join => gameLogic.join(j) cacheStore.find(roomId).get case Frame => cacheStore.find(roomId).get } GameRoom(roomId, bus)

// Create bus parts. val (sink, source) = MergeHub.source[GameMessage](perProducerBufferSize =
16) .toMat(BroadcastHub.sink(bufferSize = 1024))(Keep.both) .run() source.runWith(Sink.ignore) sink.runWith(Source.repeat(Frame).throttle(1, 1.second, 5, ThrottleMode.Shaping)) val channel = GameChannel(sink, source) val bus: Flow[GameMessage, GameMessage, UniqueKillSwitch] = Flow.fromSinkAndSource(channel.sink, channel.source) .joinMat(KillSwitches.singleBidi[GameMessage, GameMessage])(Keep.right) .backpressureTimeout(3.seconds) .map[GameMessage] { case j: Join => gameLogic.join(j) cacheStore.find(roomId).get case Frame => cacheStore.find(roomId).get } GameRoom(roomId, bus) ήʔϜαʔό࣮૷্ͷϙΠϯτ 'SBNFϝοηʔδΛҰఆִؒͰൃੜͤ͞Δ

16) .toMat(BroadcastHub.sink(bufferSize = 1024))(Keep.both) .run() source.runWith(Sink.ignore) sink.runWith(Source.repeat(Frame).throttle(1, 1.second, 5, ThrottleMode.Shaping)) val channel = GameChannel(sink, source) val bus: Flow[GameMessage, GameMessage, UniqueKillSwitch] = Flow.fromSinkAndSource(channel.sink, channel.source) .joinMat(KillSwitches.singleBidi[GameMessage, GameMessage])(Keep.right) .backpressureTimeout(3.seconds) .map[GameMessage] { case j: Join => gameLogic.join(j) cacheStore.find(roomId).get case Frame => cacheStore.find(roomId).get } GameRoom(roomId, bus) ήʔϜαʔό࣮૷্ͷϙΠϯτ ྲྀΕͯ͘Δϝοηʔδʹର ͯ͠ॲཧΛద༻ NBQ

16) .toMat(BroadcastHub.sink(bufferSize = 1024))(Keep.both) .run() source.runWith(Sink.ignore) sink.runWith(Source.repeat(Frame).throttle(1, 1.second, 5, ThrottleMode.Shaping)) val channel = GameChannel(sink, source) val bus: Flow[GameMessage, GameMessage, UniqueKillSwitch] = Flow.fromSinkAndSource(channel.sink, channel.source) .joinMat(KillSwitches.singleBidi[GameMessage, GameMessage])(Keep.right) .backpressureTimeout(3.seconds) .map[GameMessage] { case j: Join => gameLogic.join(j) cacheStore.find(roomId).get case Frame => cacheStore.find(roomId).get } GameRoom(roomId, bus) ήʔϜαʔό࣮૷্ͷϙΠϯτ 'SBNFͱ͍͏ϝοηʔδͩͬͨΒɺ 3FEJT͔Βঢ়ଶΛऔಘͯ͠ૹग़͢Δ

MergeHub.source[GameMessage](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 1024))(Keep.both) .run() source.runWith(Sink.ignore) sink.runWith(Source.repeat(Frame).throttle(1, 1.second, 5, ThrottleMode.Shaping)) val channel = GameChannel(sink, source) val bus: Flow[GameMessage, GameMessage, UniqueKillSwitch] = Flow.fromSinkAndSource(channel.sink, channel.source) .joinMat(KillSwitches.singleBidi[GameMessage, GameMessage])(Keep.right) .backpressureTimeout(3.seconds) .map[GameMessage] { case j: Join => gameLogic.join(j) cacheStore.find(roomId).get case Frame => cacheStore.find(roomId).get } GameRoom(roomId, bus)

MergeHub.source[GameMessage](perProducerBufferSize = 16) .toMat(BroadcastHub.sink(bufferSize = 1024))(Keep.both) .run() source.runWith(Sink.ignore) sink.runWith(Source.repeat(Frame).throttle(1, 1.second, 5, ThrottleMode.Shaping)) val channel = GameChannel(sink, source) val bus: Flow[GameMessage, GameMessage, UniqueKillSwitch] = Flow.fromSinkAndSource(channel.sink, channel.source) .joinMat(KillSwitches.singleBidi[GameMessage, GameMessage])(Keep.right) .backpressureTimeout(3.seconds) .map[GameMessage] { case j: Join => gameLogic.join(j) cacheStore.find(roomId).get case Frame => cacheStore.find(roomId).get } GameRoom(roomId, bus) Ұఆִؒ͝ͱʹήʔϜঢ়ଶ͕ಘΒΕΔ ΫϥΠΞϯτͱͯ͠͸ ͜ΕΛ࢖ͬͯը໘Λඳը͢Ε͹0,

ϦΞϧλΠϜαʔόʹ͓͍ͯ"LLB͸Ͳ͏͔ 4USFBNTͰ1VCMJTI4VCTDSJCFߏஙՄೳ .FSHF)VCͱ#SPBEDBTU)VCͰ8FC4PDLFUͷೖग़ྗΛ ಈతʹͭͳ͙͜ͱ͕Ͱ͖ΔɻଟରଟͷϦΞϧλΠϜαʔόߏ ஙύλʔϯͷͻͱͭɻ ྲྀྔ΍σʔλൃੜස౓ͷௐ੔͕Մೳ ཁ݅ʹԠͯ͡ෛՙͷ੍ޚ͕Մೳɻ͜Ε͸"LLB4USFBNTඪ ४ػೳͱͯ͠උΘ͍ͬͯΔɻ

ϦΞϧλΠϜαʔόʹ͓͍ͯ4DBMB͸Ͳ͏͔ ྲྀΕΔϝοηʔδʹܕ৘ใΛ࣋ͨͤΔ͜ͱ͕Ͱ͖Δ *OQVU͕ԿͰɺ0VUQVU͕Կͷ෦඼ͳͷ͔໌Β͔ɻܕ৘ใ͕ ෆਖ਼ͳ෦඼Λ૊Έ߹ΘͤΑ͏ͱ͢ΔͱίϯύΠϧΤϥʔʹͳ ΔɻϥϯλΠϜΤϥʔͰ͸ͳ͍ɻ ύλʔϯϚονʹΑΔೖग़ྗͷ੍ޚ σʔλͷγϦΞϥΠζɺσγϦΞϥΠζͰ׆༂ɻෆਖ਼ͳσʔ λͷ৵ೖΛ๷͙ͱͱ΋ʹɺग़ྗ͢ΔσʔλͷܕΛอূ͢Δɻ

Akka Streams Λ࢖ͬͯ ଞʹ΋ͳʹ͔Ͱ͖ͦ͏ ͥͻ࠙਌ձͳͲͰڭ͍͑ͯͩ͘͞ Twitter ϦϓͰ΋ @waddy_u

ηογϣϯͰར༻ͨ͠ιʔείʔυ͸ͪ͜Β αʔόʔαΠυ"LLB4USFBNT EFWFMPQFSTJPNFEJBTFSWFSXFCTPDLFUBLLBTUSFBN  IUUQTHJUIVCDPNDNXBEBZVTVLFEFWFMPQFSTJP USFFNBTUFSNFEJBTFSWFSXFCTPDLFUBLLBTUSFBN ΫϥΠΞϯταΠυ"OHVMBS EFWFMPQFSTJPBOHVMBSNFEJBTUSFBNBQQ  IUUQTHJUIVCDPNDNXBEBZVTVLFEFWFMPQFSTJP USFFNBTUFSBOHVMBSNFEJBTUSFBNBQQ

ࢀߟॻ੶ɾར༻ͨ͠πʔϧ w "LLBIUUQBLLBJP w "OHVMBSIUUQTBOHVMBSJP w .FEJB4PVSDF&YUFOTJPOTäIUUQTXXXXPSH53NFEJBTPVSDF w .FEJB4PVSDFIUUQTEFWFMPQFSNP[JMMBPSHKBEPDT8FC"1*.FEJB4PVSDF
w 8FC4PDLFUTIUUQTXXXQMBZGSBNFXPSLDPNEPDVNFOUBUJPOY4DBMB8FC4PDLFUTXFCTPDLFUT

Akkaちゃんと遊ぼう！ Akka Streams で作るリアルタイムサーバ #scalafu...

Akkaちゃんと遊ぼう！ Akka Streams で作るリアルタイムサーバ #scalafukuoka / Implement stream server with Akka Streams and WebSocket

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