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

View Slide

ࣗݾ঺հ
w ࿨ా༞հ
w ೥݄೔
w ۀ຿4DBMB1MBZ
w 5XJUUFS!XBEEZ@V
w झຯ૲໺ٿ 
ɹɹɹΠΧͷ΍ͭ ৽ࢀ

View Slide

࿩͢಺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

View Slide

w ·ͱΊ
NJO

View Slide

"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

View Slide

"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
)551ͱ্ड़ͷΑ͏ͳ࢓૊ΈΛόοΫΤϯυͱͯͭ͠ͳ͙

View Slide

4USFBNT σʔλͷ։࢝ͱऴ͕ྃఆٛ͞Ε͍ͳ͍λΠϓͷ࢓ࣄʢετϦʔϛϯ

View Slide

manuzhang/awesome-streaming: a curated list of awesome
streaming frameworks, applications, etc https://github.com/
manuzhang/awesome-streaming
وॏͳετϦʔϛϯάϥΠϒϥϦ

View Slide

ετϦʔϛϯάόοΫΤϯυΛߏ
ஙͰ͖Δͱ৭ʑͱԠ༻͕ޮ͘ͷͰ
͸ʂʁ
Streaming
Req/Res
Service
Batch

View Slide

͸ʂʁ
ྲྀΕདྷͯΔ
Google Trend
“Akka Streams”

View Slide

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

View Slide

"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/

View Slide

গ͠Ͱ΋਌͠ΈΛ࣋ͬͯཉ͍͠

View Slide

Akka Streams ͱ͸!!
Έ͍ͨͳ࿩Λ͢ΔΑΓ΋

View Slide

श͏ΑΓ׳ΕΖਫ਼ਆ

View Slide

ʮ͜Μͳ΋ͷ΋࡞ΕͨΑʂʯ

View Slide

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

View Slide

w ·ͱΊ
NJO

View Slide

ετϦʔϜॲཧͷߟ͑ํ
ҰൠతʹετϦʔϜͱ͍͑͹
σʔλൃੜݯ 4PVSDF

σʔλड৴ऀ 4JOL

σʔλ੍ޚ 'MPX

͜ΕΒͷ࢓ࣄΛ΍Δਓ͕͍Ε͹ͳΜͱ͔ͳΔ
"LLB4USFBNTʹ͓͍ͯ͸Ͳ͏͍͏ѻ͍͔ʁ

View Slide

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

View Slide

͋ͷ͊͞
͓·͑͸ҰମԿΛݴ͍ͬͯΔΜͩ

View Slide

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

View Slide

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·͢

View Slide

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()
}
}

View Slide

ͷഒ਺Λग़ྗ͢ΔΑ͏ͳάϥϑΛ࡞Ε
import akka.stream.ActorMaterializer
import akka.stream.scaladsl.{ Flow, Sink, Source }
object StreamApplication {
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

View Slide

w ·ͱΊ
NJO

View Slide

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

View Slide

֎ͷੈք
ͭ·ΓΫϥΠΞϯτͱͭͳ͛ͳ͍͔ʁ
͜͜·Ͱ΍ͬͯΈͯ

View Slide

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

View Slide

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
}
}

View Slide

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

View Slide

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

View Slide

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

View Slide

1MBZͱ"LLB4USFBNTΛ࢖ͬͯ
WebSocket ͷόοΫΤϯυΛ
ߏஙͰ͖Δ͜ͱ͕Θ͔ͬͨʂ

View Slide

࿩͢಺༰
w ·ͱΊ
NJO

View Slide

WebSocket ͱ Akka Streams
Λ࢖ͬͯɺԿ͔ͭ͘Γ͍ͨ

View Slide

ͻͱΓͷཁٻʹରͯ͠
ετϦʔϜॲཧΛߦ͏ͷ͸
REST ͱͦΜͳʹมΘΒͳ͍

View Slide

ଟରଟ
ϦΞϧλΠϜ௨৴Λ࣮ݱ͢Δ
αʔόΛ࣮૷Ͱ͖ͳ͍͔ʁ

View Slide

ͭ·Γ͜ΜͳΠϝʔδ

View Slide

ͭ·Γ͜ΜͳΠϝʔδ
Publish / Subscribe
νϟωϧΛ࡞Γ͍ͨʂ

View Slide

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

View Slide

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

View Slide

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

View Slide

զʑ͕ཉ͍͠෦඼
!?

View Slide

զʑ͕ཉ͍͠෦඼

View Slide

զʑ͕ཉ͍͠෦඼
!!

View Slide

MergeHub
BroadcastHub

View Slide

MergeHub
BroadcastHub
are God

View Slide

.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

View Slide

ଟରଟͷςΩετૹड৴νϟωϧΛ࡞ͬͯΈΔ
package controllers
import akka.stream.scaladsl.{ BroadcastHub, Flow, Keep, MergeHub, Sink }
import akka.stream.{ ActorMaterializer, KillSwitches, UniqueKillSwitch }
import scala.concurrent.duration._
class WebSocketController @Inject()(cc: ControllerComponents) extends AbstractController(cc) {
}
def dynamic() = WebSocket.accept[String, String] { req =>
DynamicStream.publishSubscribeFlow
}
}

View Slide

package controllers
import akka.stream.scaladsl.{ BroadcastHub, Flow, Keep, MergeHub, Sink }
import akka.stream.{ ActorMaterializer, KillSwitches, UniqueKillSwitch }
import scala.concurrent.duration._
class WebSocketController @Inject()(cc: ControllerComponents) extends AbstractController(cc) {
}
def dynamic() = WebSocket.accept[String, String] { req =>
DynamicStream.publishSubscribeFlow
}
}
1VCMJTI4VCTDSJCF
'MPX͕ཉ͍͠

View Slide

object DynamicStream {
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
}
}

View Slide

.run()
busFlow
}
}
.FSHF)VCͱ
#SPBEDBTU)VCΛͭͳ͍Ͱ
SVO͢Δͱ
4JOLͱ4PVSDF͕Ͱ͖Δ

View Slide

.run()
busFlow
}
}

View Slide

.run()
busFlow
}
}
RUN

View Slide

.run()
busFlow
}
}

View Slide

.run()
busFlow
}
}
ͭ·Γ͜ΕΛͭͳ͛͹…ʁ

View Slide

.run()
busFlow
}
}

View Slide

.run()
busFlow
}
}
4USFBN͕
٧·Βͳ͍Α͏ʹ
ഉਫޱΛͭͳ͙

View Slide

.run()
busFlow
}
}

View Slide

.run()
busFlow
}
}
ͭͳ͍Ͱ'MPXΛ࡞Δ
cc
͜Ε͕ϝοηʔδόεʹ

View Slide

࣮ߦ
.run()
busFlow
}
}

View Slide

࣮ߦ
.run()
busFlow
}
}
XBEBͷೖྗ͕

View Slide

࣮ߦ
.run()
busFlow
}
}
ZVTVLFͷग़ྗʹʂ

View Slide

࣮ߦ
.run()
busFlow
}
}
ZVTVLFͷೖྗ͕

View Slide

࣮ߦ
.run()
busFlow
}
}
XBEBͷग़ྗʹʂ

View Slide

͋Εʁ

View Slide

ɹ͜ΕνϟοτγεςϜ͕Ͱ͖ͨͷͰ͸ʁ

View Slide

࿩͢಺༰
w ·ͱΊ
NJO

View Slide

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

View Slide

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

View Slide

DEMO

View Slide

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)
}
}

View Slide

) {
}
}
8FC4PDLFU*/+40/
ˣม׵
$IBOOFM*/$IBU.FTTBHF

View Slide

) {
}
}
$IBOOFM065$IBU.FTTBHF
ˣม׵
8FC4PDLFU065+40/

View Slide

) {
}
}

View Slide

จࣈνϟοτΛ"LLB4USFBNTͰ࣮૷ͨ͠ײ૝
1VCMJTI4VCTDSJCFνϟωϧ΄΅ͦͷ··࢖͑Δ
8FC4PDLFUͰͭͳ͕Δ֎ͷੈք +40/
ͱɺνϟωϧ
Ͱྲྀ͢ܕ $IBU.FTTBHF
Λม׵͢Δ෦඼ 'MPX
Λ௥
Ճ͢Δ͜ͱͰνϟωϧ಺ͷܕΛอূͰ͖Δ
ϑϩϯτΤϯυͷϦΞΫςΟϒϥΠϒϥϦͱ૬ੑ͕ྑ͍
ࠓճ͸"OHVMBS3Y+4Λར༻

View Slide

࿩͢಺༰
w ·ͱΊ
NJO

View Slide

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

View Slide

ϏσΦνϟοτߏ੒֓؍

View Slide

ϒϥ΢βʹ͸ࢀՃऀ͝ͱͷWJEFPλά

View Slide

αʔόʔαΠυ͸ࢀՃऀ͝ͱͷ
όΠφϦνϟωϧ

View Slide

ࢀՃऀ৘ใ͕ྲྀΕΔผͷνϟωϧ
ϒϥ΢β։͍ͨΒࢀՃɺ
ดͨ͡Β཭୤

View Slide

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

View Slide

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

View Slide

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

View Slide

ͲΜͳ΋ͷΛ࡞͔ͬͨ
DEMO

View Slide

-PDBM4USFBN
DEMO

View Slide

νϟωϧΛհͯ͠౉͖ͬͯͨ
ࣗ෼ͷόΠφϦ
DEMO

View Slide

4͞ΜͷόΠφϦ
DEMO

View Slide

,͞ΜͷόΠφϦ
DEMO

View Slide

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

View Slide

࿩͢಺༰
w ·ͱΊ
NJO

View Slide

ΦϯϥΠϯϚϧόπήʔϜΛ࡞Δ͜ͱʹͨ͠
ήʔϜͷঢ়ଶΛӬଓԽ
3FEJTʹ+40/ͱͯ͠อଘ͢Δɻ
lίϚϯυzͰήʔϜঢ়ଶΛߋ৽ )551

ͨͩσʔλΛྲྀ͚ͩ͢Ͱͳ͘ɺϩδοΫΛద༻͢Δɻ
ӬଓԽͨ͠ঢ়ଶΛҰఆִؒͰૹग़
ྲྀΕͯ͘ΔσʔλΛͦͷ··ར༻͢Δ͜Ε·Ͱͱ͸ҟͳΔɻ

View Slide

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

View Slide

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

View Slide

DEMO

View Slide

ήʔϜαʔό࣮૷্ͷϙΠϯτ
// Create bus parts.
MergeHub.source[GameMessage](perProducerBufferSize = 16)
.run()
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)
.map[GameMessage] {
case j: Join =>
gameLogic.join(j)
cacheStore.find(roomId).get
case Frame =>
}
GameRoom(roomId, bus)

View Slide

.run()
.map[GameMessage] {
case j: Join =>
gameLogic.join(j)
case Frame =>
}
'SBNFϝοηʔδΛҰఆִؒͰൃੜͤ͞Δ

View Slide

.run()
.map[GameMessage] {
case j: Join =>
gameLogic.join(j)
case Frame =>
}
ྲྀΕͯ͘Δϝοηʔδʹର
ͯ͠ॲཧΛద༻ NBQ

View Slide

.run()
.map[GameMessage] {
case j: Join =>
gameLogic.join(j)
case Frame =>
}
'SBNFͱ͍͏ϝοηʔδͩͬͨΒɺ
3FEJT͔Βঢ়ଶΛऔಘͯ͠ૹग़͢Δ

View Slide

.run()
.map[GameMessage] {
case j: Join =>
gameLogic.join(j)
case Frame =>
}

View Slide

.run()
.map[GameMessage] {
case j: Join =>
gameLogic.join(j)
case Frame =>
}
Ұఆִؒ͝ͱʹήʔϜঢ়ଶ͕ಘΒΕΔ
ΫϥΠΞϯτͱͯ͠͸
͜ΕΛ࢖ͬͯը໘Λඳը͢Ε͹0,

View Slide

࿩͢಺༰
w ·ͱΊ NJO

View Slide

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

View Slide

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

View Slide

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

View Slide

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

View Slide

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

View Slide

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

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

Yusuke Wada

More Decks by Yusuke Wada

Other Decks in Technology

Featured

Transcript