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Scala の Future と Haskell の IO
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May 11, 2014
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Scala の Future と Haskell の IO
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May 11, 2014
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Transcript
Scala ͷ Future ͱ Haskell ͷ IO 2014-05-11 (Sun) ؔܕLTେձ
@daimatz
୭ • @daimatz • Dennoo, Inc. • Scala ͰΞυαʔόΛॻ͍͍ͯ·͢ •
Haskell ྺ 2ɺ Scala ྺ ͘Β͍
Scala ͷ Future ͱ Haskell ͷ IO ࣅ͍ͯΔ ݴ͍͍ͨ͜ͱ͜Ε͚ͩ
Future ͱ • ඇಉظܭࢉͷϞσϧ • ֓೦ࣗମ Promise ͱ͍͏ • Future
ΛݺͿͱඇಉظͰܭࢉ͕Δ • ίʔϧόοΫؔΛొ͢Δ͜ͱͰͦͷܭࢉ͕ऴΘͬ ͨ͋ͱͷڍಈΛ੍ޚ͢Δ
Future ྫ val f: Future[List[String]] = session.getRecentPosts" ! f.respond {"
case Return(posts) =>" for (post <- posts) println(post)" case Throw(throwable) =>" println(“error:” + throwable.getMessage)" } • Twitter ൛ͷྫɻ Scala ඪ४൛Ͱ໊લҧ͏͕ େମಉ͡
Scala Ͱ͏ओͳ Future ࣮ • com.twitter.util.Future" • Twitter ʹΑΔ࣮ɺ Finagle
ͱ͔ • scala.concurrent.Future" • Scala 2.10 Ͱඪ४ʹೖͬͨɺ Akka ͱ͔ • java.util.concurrent.Future" • Java ඪ४ͷ࣮ɺ Netty ͱ͔
Scala ͷ Future ͱ Haskell ͷ IO ࣅ͍ͯΔ • Scala
ͷ Future ɺ Haskell ͷ IO ͱಉ͡Α͏ͳ ײ֮Ͱ͑ΔɻݟͨΑ͘ࣅ͍ͯΔɻ • ܕͰΘ͔Δ • ϞφυͰ͋Δ • ېஅͷຐ๏͕͋Δ
ܕͰΘ͔Δ • def foo(x: String): Future[Int]" • ඇಉظܭࢉ͕ߦΘΕΔ͜ͱΛ Future[A] Ͱද͢
• bar :: String -> IO Int" • ෭࡞༻ͷ͋ΔܭࢉͰ͋Δ͜ͱΛ IO a Ͱද͢
ϞφυͰ͋Δ • for { a <- someFutureFunction() b <- otherFutureFunction(a)
} yield b" • do a <- someIOFunction b <- otherIOFunction a return b
ېஅͷຐ๏͕͋Δ • Future IO ͷੈքʹҰೖͬͨΒجຊతʹೋͱΕͳ͍ • Future ΛऔΓআ͘ېஅͷຐ๏ Await.result
• Await.result(x: Future[A]): A" • εϨουͷ join Έ͍ͨͳͷ͕ͩɺεϨουΛϑϧ׆༻͢Δ ϓϩάϥϜͰ͍͚ͬͯͳ͍ • IO ΛऔΓআ͘ېஅͷຐ๏ unsafePerformIO • unsafePerformIO :: IO a -> a
ࣅ͍ͯͳ͍ͱ͜Ζɿྫ֎ͷѻ͍ • com.twitter.util.Try[A]" • ྫ֎͕ى͜Δ͔͠Εͳ͍ܭࢉΛϥοϓ͢ΔΫϥε • ͜Ε Scala 2.10 Ͱ
scala.util.Try ͱͯ͠ඪ४ʹ • Future[A] ͷ࣮ମ Promise[A] Ͱɺܭࢉ͕ྃͨ͠Β Try[A] ʹͳ͍ͬͯΔ • Try[A] ͷ࣮ମ Return[A] ͘͠ Throw[A] • Return[A] ݁ՌΛϥοϓɺ Throw[A] ྫ֎Λϥοϓ
·ͱΊ • Scala ͷ Future ͱ Haskell ͷ IO ࣅ͍ͯΔ
• ͦΕʹؾ͍ͮͨޙ͢ΜͳΓͱ Future ΛཧղͰ͖ͨ͠ɺϓϩά ϥϜॻ͚ΔΑ͏ʹͳͬͨ • Haskell Λ͍ͬͯΔਓ͕ Scala ͷ Future Λ৮Γ࢝Ίͨͱ͖ʹ ͍ͬͯΔͱศར • Scala ެࣜͷઆ໌Θ͔Γʹ͍͘ͱࢥ͏… http://docs.scala-lang.org/ja/overviews/core/futures.html • twitter/util ͱ twitter/finagle Λಡ͏
ʢهʣ • ཁʮFuture ҰํੑϞφυͳͷͰɺʢ؆୯ʹʣ Εͳ͍͔Β͍ํʹҙʯͱݴ͍ͬͯΔ͚ͩͰ͢ • ҰํੑͷϞφυ Haskell Ͱ IO
͕Ұ൪Θ͔Γ ͍͢ྫͳͷͰɺͦΕͱͷରൺΛڍ͛·ͨ͠