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%FWFMPQFST*0 # ߥҪ༞ี ⡥$MBTTNFUIPE *OD ೥݄೔ 4DBMB .PCJMF#BDLFOEPO"84 

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#cmdevio2016 #B

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whoami • Yusuke Arai • Classmethod (2014/11~) • Mobile Backend API Team (2015/02~) • AWS / Scala / Javascript / android • dev.classmethod.jp/author/arai-yusuke

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Today's topics • Scalaͷoverview • ScalaΛ࢖ͬͨϞόΠϧόοΫΤϯυAPI • ͳͥAWSωΠςΟϒͷ࣌୅ʹScala͕ඞཁ͔ • How to આಘ your client in "Scala࢖͍·͢!"

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Today's topics • Scalaͷoverview • ScalaΛ࢖ͬͨϞόΠϧόοΫΤϯυAPI • ͳͥAWSωΠςΟϒͷ࣌୅ʹScala͕ඞཁ͔ • How to આಘ your client in "Scala࢖͍·͢!"

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Scalaͷoverview

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Martin Odersky Deutscher Informatiker / 1958~

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Scala • JVMݴޠʢJavaόΠτίʔυΛੜ੒ʣ • JavaͷطଘίʔυΛ௚઀ࢀরՄೳ • ڧ͍੩తܕ෇͚ݴޠ • ໊લ͸"Scalable"͔Β

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Scala ͷจ๏ • ηϛίϩϯͷͳ͍JavaͬΆ͘΋ॻ͚Δ • RubyͬΆ͘΋ॻ͚Δ • هड़ྔ͕গͳ͍ • ৄ͘͠͸άά͍ͬͯͩ͘͞m(_ _)m

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Scala ͷ΢ιɾϗϯτ

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Αࣖ͘ʹ͢Δ࿩ • ؔ਺ܕͷϓϩάϥϛϯάݴޠ • Rubyʹ͍ۙͷͰLLܦݧऀͳΒָউ • Java͕Θ͔Ε͹͙͢ʹॻ͚ΔΑ͏ʹͳΔ • ΤίγεςϜʢPlayʣ͸RailsϥΠΫ

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શ෦΢ιͰ͢ • ؔ਺ܕͷϓϩάϥϛϯάݴޠ • Rubyʹ͍ۙͷͰLLܦݧऀͳΒָউ • Java͕Θ͔Ε͹͙͢ʹॻ͚ΔΑ͏ʹͳΔ • ΤίγεςϜʢPlayʣ͸RailsϥΠΫ

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Scala ͷϗϯτ

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Scalaͷϗϯτ • ચ࿅͞ΕͨOOPݴޠ
 ͨͩ͠HaskellͷӨڹΛڧ͘ड͚͓ͯΓɺؔ਺ܕͷ ॻ͖ํͰॻ͘͜ͱ΋Մೳʹͳ͍ͬͯΔ • JVM΍Javaݴޠ΁ͷཧղ͕ඞཁ • ΤίγεςϜʢPlayʣ͸ڧྗͳܕγεςϜΛ಺แ͠
 FP, FRPΛલఏͱ͍ͯ͠Δ

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Not ؔ਺ܕݴޠ • ݁ߏ͋Δצҧ͍ʮScala͸ؔ਺ܕݴޠDA!ʯ • Scalaࣗମ͸ચ࿅͞ΕͨOOPݴޠ • ͨͩ͠७ਮؔ਺ϕʔεͷ։ൃΛڧ͘αϙʔτͯ͠Δ • Haskellͱಉ͡ॻ͖ํΛ͠Α͏ͱࢥ͑͹Մೳ
 ओͳཧ༝ͱͯ͠Scala͕ΞυϗοΫଟ૬ੑΛදݱͰ͖ Δ͔Β

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Java/JVMͷཧղ͕ඞཁ • JVM͕ܕফڈϞσϧͰ͋Δ͜ͱʢॏཁʣ • Generics͸Java 1.5Ͱ௥Ճ͞Εͨ͜ͱ, ClassManifestͷڍಈ, etc… • Javaͷจ๏ͳͲΑΓ΋ɺJavaͷྺ࢙ʹର͢Δ
 ཧղ͕ඞཁ

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☓ LL࿩ऀͳΒೃછΈ΍͍͢ • Scala͸altJavaͱͯ͠΋ར༻Ͱ͖Δ͕
 ͦΕ͸"Scalaݴޠ"ʹݶͬͨ࿩ͰɺΤίγεςϜ͕ͦΕΛ
 ڐ͢ͱ͸ݶΒͳ͍ • Play Framework 2.4 ͸ڧྗͳܕγεςϜΛ಺෦ʹ࣋ͪɺ
 ਵॴͰܕγεςϜ΁ͷཧղΛཁٻ͢Δɻ • ྫ: JsResult ͸ Applicative Functor
 Writes ͸ Contravariant Functor

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ࢹ఺Λม͑Δ

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Scala Λ࢖͍͚ͬͯ͹…… • JVM΍Javaͷྺ࢙ʹ͍ͭͯਂ͘ཧղͰ͖Δ • ؔ਺ܕͷάουϓϥΫςΟε͕औΓࠐΊΔ • ܕΫϥεɺ୅਺తσʔλܕɺؔखɺϞφυ
 ͳͲͷమ൘ύλʔϯ͕࢖͑ΔΑ͏ʹͳΔ • ৽͠ΊͷݴޠͰ͸͍͍ͩͨˢ͕Ұ෦·ͨ͸શ෦࢖͑Δ
 ྫ͑͹Swiftʹ΋flatMapϝιου͕༻ҙ͞Ε͍ͯ·͢ • ৽͍͠ػೳΛ࢖͍͜ͳ͠඼࣭ͷߴ͍ΞϓϦΛ࡞Δ͜ͱ͕Մೳʹʂ


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Scalaͷoverview ͸ ͜Μͳײ͡Ͱ͢

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Today's topics • Scalaͷoverview • ScalaΛ࢖ͬͨϞόΠϧόοΫΤϯυAPI • ͳͥAWSωΠςΟϒͷ࣌୅ʹScala͕ඞཁ͔ • How to આಘ your client in "Scala࢖͍·͢!"

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ScalaΛ࢖ͬͨ
 ϞόΠϧόοΫΤϯυAPI

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ϞόΠϧAPIαʔόʔΛ࡞ͬͨ • डୗϞόΠϧΞϓϦҊ݅ • ϦϦʔεޙ͸C100K͕΄΅ؒҧ͍ͳ͍ • ҆ఆͯ͠ࡹͨ͘ΊʹϑϩϯτAPIαʔόʔʹ͸
 Play-ScalaΛ࠾༻ • όοΫΤϯυ΋AkkaΛ࢖͍͍ͨͱ͍͏ཧ༝͔Β
 Play-Scalaʹͨ͠

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։ൃͷਐΊํ • ϑϧͰςετॻ͘
 ʢશΫϥεϢχοτςετɺAPIຖ࠷௿̍݁߹ςετʣ • pull reqϨϏϡʔඞਢ • Scalaz΍Cats͸࢖Θͳ͍ • ࠓϦϦʔεલͳͷͰύϑΥʔϚϯεɾӡ༻ʹ͍ͭͯͷ͜ͱ͸Կͱ΋ ݴ͑ͳ͍ʢϦϦʔεͰ͖͍ͯͨΒӡ༻ϊ΢ϋ΢Λ͓఻͔͑ͨͬͨ͠Ͱ͢……ʣ

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։ൃͰײͨ͜͡ͱ

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͑͛ͭͳ͍΄Ͳॻ͖΍͍͢ • ϘΠϥʔϓϨʔτίʔυͷগͳ͞ʹҺͼٽ͘ • ݴޠͦͷ΋ͷ͕ImmutableΛਪͯ͘͠ΕͯΔ ͜ͱͷ༗Γ೉ΈΛࢥ͍஌Δ • ผʹΧοίΑ͘ॻ͜͏ͱͯ͠ͳ͍ͷʹؔ਺͸
 ͍͍ͩͨ5ߦҎ಺ʹ·ͱ·Δ

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ΊͬͪΌಡΈ΍͍͢ • ʮScala͸ه߸͹͔ͬͰಡΈʹ͍͘ʯͬͯ
 ͱ͓͍ੲʹฉ͍ͨ͜ͱ͕͋ͬͨ • ͦΕ͸௒HaskellͬΆ͘ॻ͍ͨ৔߹ͷ࿩ͩͬͨ • γϯϓϧʹॻ͍͍ͯ͘ͱӳޠͬΆ͍จ຺Λ࣋ͭ • pull reqϨϏϡʔ͕ḿΔ

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ͳΜͱͳ͘ӳޠͬΆ͍ͷͰ͢

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Akka • ࠓճ͸ϫʔΧʔΛAkka SchedulerͰ࣮૷ • AkkaͷFault ToleranceΛങͬͨ • Amazon SQS΍Amazon SNSͱ͏·݁͘߹͢Δ • DynamoDB Stream΍Kinesisͱ͚ͬͭͨ͘Β
 ઈରָ͍͠ͰΑ͢Ͷ

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AWS Java SDK͕࢖͑Δ • AWSͷϑϧϚωʔδυαʔϏεʢCognito΍DynamoDBʣ ͱ΍ΓऔΓ͢ΔΞϓϦΛ࡞Δ৔߹ɺ
 AWS SDKͷυΩϡϝϯςʔγϣϯ۩߹͸ࢮ׆໰୊ • AWS Java SDKʹ͸Կͷ৺഑΋ͳ͔ͬͨ • Scalaͷݴޠࢥ૝ͱͯ͠ʮmutable࣮૷ΛimmutableͳΠϯ λϑΣʔεͰӅṭʯͱ͍͏ͷ͕͋Δ
 ˠ AWS Java SDK ͸Πϯϑϥ૚ͰӅṭͰ͖ΔͷͰແ໰୊

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ΞʔΩςΫνϟͷར఺ʢ1ʣ • ७ਮؔ਺ܕݴޠͩͱmainؔ਺ͷ֎ଆɺͭ·Γࣗ෼Ͱίϯτ ϩʔϧͰ͖ͳ͍ྖҬ·Ͱ෭࡞༻Λ஗Ԇ͠ͳ͚Ε͹ͳΒͳ͍ ʢ͜ͱ͕ଟ͍ʣ • ScalaͰ͸෭࡞༻Λى͜͢λΠϛϯάΛࣗ෼Ͱ
 ίϯτϩʔϧͯ͠OK
 ※ Haskellʹ΋unsafePerformIOͱ͔͸͋Γ·͕͢…… • ຊ౰ʹ஗Ԇ͢΂͖෭࡞༻ʢυϝΠϯϩδοΫ͕ى͜͢෭࡞༻ʣ ͱͦΕҎ֎ʢϩάͱ͔ʣΛผͷ΋ͷͱͯ͠ѻ͏͜ͱ͕༰қ ιϑτ΢ΣΞ

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ΞʔΩςΫνϟͷར఺ʢ2ʣ • ݴޠϨϕϧͰDIΛڧ͘αϙʔτ͢ΔͷͰ
 DIPୡ੒ͷલఏ͕͋ΔΞʔΩςΫνϟͱೃછΉ • Layered Architecture, Onion Architecture… • DDDͳͲͰΑ͘࠾༻͞ΕΔΞʔΩςΫνϟ ιϑτ΢ΣΞ

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ଓ͖͸·ͨޙͰ
 ࣌ؒʹ༨༟͕͋Ε͹

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Today's topics • Scalaͷoverview • ScalaΛ࢖ͬͨϞόΠϧόοΫΤϯυAPI • ͳͥAWSωΠςΟϒͷ࣌୅ʹScala͕ඞཁ͔ • How to આಘ your client in "Scala࢖͍·͢!"

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ͳͥAWSωΠςΟϒ࣌୅ʹ Scala͕ඞཁ͔

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ϚΠΫϩαʔϏε ΞʔΩςΫνϟ

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ϚΠΫϩαʔϏεΞʔΩςΫνϟ • Ұͭͷ໾ׂΛ΋ͬͨૄ݁߹Ͱখ͞ͳαʔϏε ʢίϯϙʔωϯτʣͷू߹Ͱେ͖ͳαʔϏε ʢΞϓϦέʔγϣϯʣΛߏங͢Δ • ͦΕͧΕͷαʔϏε͸Dockerίϯςφ΍EC2 Πϯελϯεͱͯ͠දݱ͞ΕΔ • ϚΠΫϩαʔϏεಉ࢜͸HTTPSͳͲͰ௨৴

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© NGINX via https://www.nginx.com/blog/service-discovery-in-a-microservices-architecture/

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࣮ࡍͲ͏ͳͷ • ScalaMatsuri 2016Ͱ৭ʑͳηογϣϯΛ
 ฉ͍ͯདྷ·͕ͨ͠ʮϦΞΫςΟϒʯ΍ʮϚΠΫϩ αʔϏεʯʹ·ͭΘΔηογϣϯ͕ଟ਺ • ೔ຊͷํΑΓ΋ւ֎ͷํͷηογϣϯଟ͠
 ˠ ւ֎Ͱ͸طʹσϑΝΫτʹͳ͖ͬͯͯͦ͏ • “ϦΞΫςΟϒ͸ResiliencyͷͨΊͷखஈͰ͋Δ”

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ߋʹઌΛோΊΔ

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ͦͷઌʹ߇͑Δͷ͸ ͕ओମͷΞʔΩςΫνϟ

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AWS Lambda ͕ओମ΁ • όοΫΤϯυʹ͋Δmicro services΁ͷ
 ΦʔέετϨʔγϣϯͰ͸ͳ͍ • υϝΠϯϩδοΫ͕AWS Lambda Functionͱ
 ͯ͠දݱ͞ΕΔαʔόʔϨεΞʔΩςΫνϟ • ୯Ґ͕ micro services ͔Β functions ΁

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Evolution of Compute – Public Cloud Infrastructure Instances Application code ©Amazon Web Services via http://www.slideshare.net/AmazonWebServices/arc308-the-serverless-company-using-aws-lambda/

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Evolution of Compute – Containers Infrastructure Instances Application code Containers ©Amazon Web Services via http://www.slideshare.net/AmazonWebServices/arc308-the-serverless-company-using-aws-lambda/

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Evolution of Compute – Serverless Application code ©Amazon Web Services via http://www.slideshare.net/AmazonWebServices/arc308-the-serverless-company-using-aws-lambda/

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࣮ࡍͲ͏ͳͷ • AWS re:Invent 2015ͰϚΠΫϩαʔϏεؔ࿈ͷηο γϣϯ͕ଟ͘ൃද͞ΕΔதͰɺੈքʹ޲͚ͯൃ৴͞Ε ͨ֓೦ʢൃද͞Εͨͷ͸͢Ͱʹ࣮ફ͞Εͨ΋ͷʣ • ͍ͣΕɺඞͣདྷΔαʔόʔϨεͷະདྷΛ৅௃͍ͯ͠Δ • ͦͷ”ະདྷ”͕དྷΔ೔ͷ͜ͱΛɺ
 ݸਓతʹ”Lambda Xσʔ”ͱݺΜͰ·͢

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ਂΈʹμΠϒ͍ͨ͠ํ͸ฐࣾ୮಺ͷهࣄΛͥͻνΣοΫʂ reinvent2015 ϚΠΫϩαʔϏε

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For Your Information

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2015.02 Lambda in VPC!! ©Amazon Web Services via http://aws.typepad.com/aws_japan/2016/02/access-resources-in-a-vpc-from-your- lambda-functions.html

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ͯ͞

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ͰΞϓϦέʔγϣϯ
 Λ։ൃ͢Δ৔߹ͷબ୒ࢶ

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Scala in AWS Lambda • Lambda͸ScalaͰॻ͚·͢ɻ͜Ε͸Scalaʹݶͬͨ࿩ Ͱ͸ͳ͘ɺJVMݴޠͳΒOKɻ • ͬ͟ͱࢼͨ͠ײ͡Ͱ͸ແཧ΍Γײ͕ͰΔ͜ͱ΋ͳ͘ɺ ͍͍ײ͡ʹॻ͚·͢ɻ • ٕज़ௐࠪΛਐΊ͍ͯͯɺ΋͏গ͠φϨοδ͕ཷ·Ε͹
 ͍ۙ͏ͪʹຊ൪ద༻ՄೳʹͳΓͦ͏ɻ

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Scala in AWS Lambda • Lambda͸ScalaͰॻ͚·͢ɻ͜Ε͸Scalaʹݶͬͨ࿩ Ͱ͸ͳ͘ɺJVMݴޠͳΒOKɻ • ͬ͟ͱࢼͨ͠ײ͡Ͱ͸ແཧ΍Γײ͕ͰΔ
 ͜ͱ΋ͳ͘ɺ͍͍ײ͡ʹॻ͚·͢ɻ • ٕज़ௐࠪΛਐΊ͍ͯͯɺ΋͏গ͠φϨοδ͕ཷ·Ε͹
 ͍ۙ͏ͪʹຊ൪ద༻ՄೳʹͳΓͦ͏ɻ ͜ͷลΓΛ۷ΓԼ͛Δ࿩Λ݄̑ʹ෱ԬͰ͠·͢ʂ
 ʲScala෱Ԭ2016ʳͰݕࡧݕࡧʂ

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ͳͥScalaΛબͿ΂͖͔ • AWS LambdaΛ࢖͏্Ͱ৐Γӽ͑ͳ͚Ε͹ͳΒͳ ͍ͷ͸”݁߹ςετͷॻ͖ʹ͘͞” • ݁߹ςετΨϯΨϯॻ͍ͯͽΎΜͽΎΜਐΊΑ͏ͥ
 ͱ͍͏จԽͱ͸͏·͘߹க͠ͳ͍ • ϢχοτςετͷΈͰΑΓଟ͘ͷ৺഑ࣄΛ
 ղফ͢Δʹ͸Ͳ͏͢΂͖͔

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ͳͥScalaΛબͿ΂͖͔ • AWS LambdaΛ࢖͏্Ͱ৐Γӽ͑ͳ͚Ε͹ͳΒͳ ͍ͷ͸”݁߹ςετͷॻ͖ʹ͘͞” • ݁߹ςετΨϯΨϯॻ͍ͯͽΎΜͽΎΜਐΊΑ͏ͥ
 ͱ͍͏จԽͱ͸͏·͘߹க͠ͳ͍ • ϢχοτςετͷΈͰΑΓଟ͘ͷ৺഑ࣄΛ
 ղফ͢Δʹ͸Ͳ͏͢΂͖͔ ڧ͍੩తܕγεςϜͷݎ࿚͞ͱ ؔ਺ܕͷҟৗܥදݱྗΛۦ࢖͢΂͠ʂ

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rapture.core.Result via https://github.com/propensive/rapture

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scalaz.\/ via https://github.com/scalaz/scalaz ʢEitherT΋͋ΔΜͩΑʂʣ

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scala.util.Either via https://github.com/scala/scala

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ؔ਺ܕͷҟৗܥදݱྗ • ͋ΔৼΔ෣͍Λςετ͢Δʹ͋ͨΓɺͦͷৼ Δ෣͍͕ى͜͢෭࡞༻ࠐΈͰςετ͢ΔͷͰ ͸ͳ͘ɺҟৗܥ΍IOΞΫηεΛදݱՄೳͳܕ Λѻ͍ɺ෭࡞༻ͷൃੜՕॴΛΪϦΪϦ·ͰΞ ϓϦέʔγϣϯͷ֎ଆʹ࣋ͪӽ͢Α͏ʹ͢Δ ͜ͱͰɺ෭࡞༻ൃੜ௚લͷ஋͕ਖ਼͍͜͠ͱ ʢ==ʣΛอূ͢Δςετ͕ॻ͚Δɻ

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ݱঢ়ͷࡉ͔͍Cons • Artifact ZIPʹ50MB੍ݶ͕͋Δ
 → ࡞ΓํΛ޻෉͢Δඞཁ͕͋Δ΋ͷͷɺ
 ɹ ϚΠΫϩαʔϏεͷߟ͑ํΛܧঝ͢ΔͳΒ͹
 ɹ ରॲՄೳͳ੍ݶ • JVMͷॳճىಈίετ͕Φʔόʔϔουʹʁ
 ˠ Lambda in VPCͳΒ͹ENIίετ΋͋ΔͷͰɺ
 ɹ ॳճ͸஗͍΋ͷͱׂΓ੾Δ

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Ұ൪఻͔͑ͨͬͨࣄͳͷͰ ͪΐͬͱৼΓฦΓ

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ͳͥAWS࣌୅ʹScala͔ • Lambda Xσʔ͸ඞͣདྷΔ • େن໛ΞϓϦΛLambdaͰ࡞Δ೔͕͘Δ • AWS݁߹ςετΛແཧ΍Γॻ͘ͷͰ͸ͳ͘
 ϢχοτςετͰ୲อͰ͖ΔྖҬΛ૿΍͢ • ͦ͏͍͏ॻ͖ํΛڧ͘αϙʔτ͍ͯ͠Δͷ͕Scala

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Today's topics • Scalaͷoverview • ScalaΛ࢖ͬͨϞόΠϧόοΫΤϯυAPI • ͳͥAWSωΠςΟϒͷ࣌୅ʹScala͕ඞཁ͔ • How to આಘ your client in "Scala࢖͍·͢!"

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How to આಘ your client in "Scala࢖͍͍ͨ!"

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"Play-ScalaΛ࢖͍·͢!" ͱ͍͏ఏҊΛ͢ΔͨΊʹ͸ ͍͔ͭ͘ͷFrameworkͱ ൺֱݕ౼Λߦ͏ඞཁ͕͋ͬͨ

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୅දతFramework • Ruby on Rails (Ruby) • Express (Node.js) • Laravel (PHP) • Play Framework (Java) • etc

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લḗઓ vs Rails, Node, PHP

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vs Rails, Node, PHP • Play-Scalaͱ͸໰୊ղܾͷϞσϧ͕͸͖ͬΓ
 ҧ͏ͷͰɺઆ໌ʢઆಘʣ͠΍͍͢ɻ • ଱ো֐ੑʢResiliencyʣ, ৳ॖੑʢElasticityʣ
 ৴པੑʢReliabilityʣͳͲͰѹউ͢Δɻ • ڧ͍ͯݴ͑͹1ΠϯελϯεͰC100Kͷޭ੷͕͋Δ Node͕Ұ൪ͷϥΠόϧɻ

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଱ো֐ੑʢResiliencyʣ • AkkaͷFault Toleranceઓུ͸Erlang/OTPͳͲ ͱฒͼ࠷ڧΫϥεͷ଱ো֐ੑΛఏڙ • ࢓૊ΈΛཧղͯ͠ਖ਼͘͠࢖͑͹ɺۚ༥ج൫΍ Πϯϑϥج൫ʹ༻͍͏ΔϨϕϧ • લḗઓͰ͸આಘͷϝΠϯ΢Σϙϯ

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৳ॖੑʢElasticityʣ • ޿ٛͰͷεέʔϥϏϦςΟ • AkkaϕʔεͷΫϥελϦϯά͕༰қ • Play΋Akkaͷ࢓૊Έͷ্Ͱಈ͍͍ͯΔ • Play-Scalaͷ୯ମॲཧੑೳ͸NodeΑΓߴ͍
 ˞ 2015/05࣌఺ͷϕϯνϚʔΫ

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৴པੑʢReliabilityʣ • ͳΜ͔ͩΜͩݴͬͯ΋JVMͰಈ͘ΞϓϦ • JVMͷྺ࢙ͱ৴པੑΛͦͷ··Ҿ͖ܧ͙͜ͱ͕Ͱ ͖Δ • νϡʔχϯά͔Βӡ༻·Ͱ࣮੷ɾจݙͱ΋ʹ๛෋ • javapίϚϯυͳͲͰղੳ͢Δͱ݁ߏಡΊ·͢

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଱ো֐ੑɺ৳ॖੑɺ৴པੑΛ ͔ͬ͠Γ཈͑Ε͹ Rails, Node, PHPʹ ڝΓෛ͚Δ͜ͱ͸ͳ͍ ※ APIαʔόʔ։ൃͷ࿩Ͱ͢

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೉߈ෆམ vs Java

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ઌ΄Ͳڍ͛ͨ ଱ো֐ੑɺ৳ॖੑɺ৴པੑ͸ ͦΕͧΕ Play, Akka → ଱ো֐ੑ Akka → ৳ॖੑ JVM → ৴པੑ

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Play-Java

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Akka for Java

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JVM

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͑ͬɺ ͦΕJavaͰ͍͍Ͱ͢ΑͶʁ

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೉߈ෆམ vs Java

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JavaΑΓScalaΛ࢖͍͍ͨཧ༝ • ίʔυهड़ྔ͕ѹ౗తʹগͳ͍ʢφ΢͍ʣ • ؔ਺ܕͰॻ͚Δʢφ΢͍ʣ • Akka, Play͸ScalaͰॻ͔ΕͯΔ͔Β௥͍΍͍͢ • …͚ͩ͡Όͳ͘Sparkͱ͔Kafkaͱ͔࠷ۙͷ
 ॏཁͳOSS͕ScalaͰॻ͔Ε·ͬͯ͘Δʢφ΢͍ʣ

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JavaΛ࢖ͬͯ΄͍͠ཧ༝ • ݴޠ࿩ऀͷ฼਺͕ѹ౗తʹଟ͍ • Ώ͑ʹϋΠΞϦϯάָ͕ • Ώ͑ʹอकɾӡ༻ମ੍Λཱͯ΍͍͢ • Ώ͑ʹ҆৺ײ͕͋Δ

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ຊ౰ʹͦ͏Ͱ͠ΐ͏͔ʁ

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Java8Λ࣮຿ϨϕϧͰॻ͚Δ ΤϯδχΞͬͯ ͦΜͳʹଟ͍ΜͰ͠ΐ͏͔ (StreamAPIʹflatMapͱ͔͋Γ·͚͢ͲͦΕ͸େৎ෉ͳΜͰ͔͢Ͷ) ※Scalaʹ΋Swiftʹ΋Haskell(*bind)ʹ΋͋ΔΑʂ

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Java8࿩ऀ͔ͭDDD࿩ऀͷ ΤϯδχΞͷϋΠΞϦϯά ͬͯͦΜͳʹָͰ͠ΐ͏͔

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Java7࿩ऀΛҭͯΕ͹Α͍ʁ

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ͳΒScalaͰ
 ΍Γ·͠ΐ͏ʂ

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"JavaΑΓ΋Scala"Λઆಘ͢Δ • ScalaΛ࢖ͬͨ৔߹ͷར఺Λઆ໌͠ • Java8࿩ऀ͕ඞͣ͠΋ଟ͘ͳ͘ɺ͔ͭJava8ʹ͸
 ͔ͳΓֶशίετ͕͔͔Δ͜ͱΛઆ໌͠ • ʢ্࢘ʹ͸ʣಉֶ͡शίετΛ෷͏ͳΒ͹ScalaΛ࢖͏΂͖ ͩͱ఻͑Δ΂͠ʂ • ʢ͓٬͞Μʹ͸ʣScalaͰ΋ϦεΫେࠩͳ͍ͱ఻͑Δ΂͠ʂ

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࣌ؒʹ༨༟͕͋Ε͹͜͜Ͱ ScalaѪΛޠΔ ిܸɺॳ࿀ɺ૬खͷ͜ͱ΋ͬͱ஌Γ͍ͨɺ…

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·ͱΊ

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·ͱΊ • Scala͸ؔ਺ܕ΋Ͱ͖ΔOOPݴޠͰ͢Αʂ • དྷΔLambda Xσʔʹ͸ɺScala͸։ൃऀʹଟ͘ͷ޾ ͤΛ΋ͨΒ͢Ͱ͠ΐ͏ɻ • Resiliency, Elasticity, Reliability!! • ScalaΛ࢖͏ར఺Λ͔ͬ͠Γઆ໌্ͨ͠Ͱ
 “JavaͳΒ͹҆৺” ͱ͍͏ݬ૝ΛͿͪյ͢ʂ

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%FWFMPQFST*0 ͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ εϥΠυ͸ޙ೔ϒϩάͰެ։͠·͢ɻ  " ⡥$MBTTNFUIPE *OD #cmdevio2016