seasar_conf_2015.pdf

1MBZ 4DBMB͸ /FYU4FBTBSͳͷ͔

ࣗݾ঺հ !VTTZ !UTVZPTIJ[BXB ٢ᖒɹؽ גࣜձࣾψʔϥϘ TDBMBPBVUIQSPWJEFS

4FBTBSͱͷؔΘΓ

ͱ͖͸ྲྀΕɾɾɾ w डୗҊ݅Ͱ͸ܧଓͯ͠4FBTBSΛ࠾༻ w 4FBTBSϝϯςφϯεϞʔυ΁ w ࣗ෼ͰԿ͔αʔϏεΞϓϦΛͭͬͯ͘Έ͍ͨʂ w 5ZQFUBMLψʔϥϘ̏ͭ໨ͷαʔϏεʹͳΔ

มԽ͠ଓ͚Δ࣌୅ "1* 8FC "OESPJE J04 0UIFS 4FSWJDF +40/ 3&45 )5.-
8FC4PDLFU .JDSPTFSWJDFT 41"

ΞʔΩςΫνϟͷҧ͍ +&&$POUBJOFS 4FBTBS +BWB /FUUZ 1MBZ'SBNFXPSL 4DBMB+BWB 4+%#$ 4MJDL 4QSPKFDU
NPEVMFT

4DBMBͷಛ௃ +BWBϢʔβʔͩͬͨࢹ఺Ͱ

*NNVUBCMF case class User(name: String, lang: Lang) val u
= User("Seasar", Lang("ja-‐JP")) u = User("Seasar", Lang("en-‐US")) // error u.name = "Seasar" // error val u2 = u.copy(lang = Lang(“en-‐US”)) w DBTFDMBTTͷDPQZϝιουΛ࢖༻͢Δ͜ͱʹ ΑͬͯɺݩͷΠϯελϯεΛ௚઀มߋ͠ͳ͍

0QUJPO w +BWBͰ0QUJPOBM͕ಋೖ w 4DBMB͸ݴޠઃܭ࣌ʹ૊Έࠐ·Ε͍ͯΔͨΊɺ $PSF"1*͔ΒOVMM͕ฦ͞Εͳ͍҆৺ײ def findUser(name: String): Option[User]
= ??? findUser("Seasar").map { user => … }.getOrElse { … }

ώΞυΩϡϝϯτ val user = User("Seasar", Lang(“en-‐US”)) s""" Hello!
Your name is $user.name """ Hello! Your name is Seasar w 4USJOH*OUFSQPMBUJPO΋͔Βαϙʔτ

ύλʔϯϚον User("Seasar", Lang("ja-‐JP")) match { case User(name, lang)
if lang == Lang("ja-‐JP") => println(s"͜Μʹͪ͸ $name ͞Μ") case User(name, _) => println(s"Hello $name") } w ΦϒδΣΫτΛ෼ղͯ͠஋ΛऔΓग़͢͜ͱ͕Ͱ͖Δ

໊લ౉͠ w ࣮ߦ௚લ·ͰॲཧΛߦΘͳ͍ w ྫʣෆཁͳϩάϨϕϧԼͰԿ΋ॲཧ͸ͤ͞ͳ͍ def time(f: => Unit) {
val before = System.currentTimeMillis f println(System.currentTimeMillis -‐ before) } val isDebug = false def debug(s: String) = if (isDebug) println(s) def lazyDebug(s: => String) = if (isDebug) println(s) time { debug("Hello" * 5000000) } // 140ms time { lazyDebug("Hello" * 5000000) } // 0ms

'VUVSF val f1 = Future { 100 } // heavyTask
val f2 = Future { 200 } // heavyTask val f = for { r1 <-‐ f1 r2 <-‐ f2 } yield (r1 + r2) f onSuccess { case r => println(r) // 300 } w ඇಉظॲཧͷ߹੒΋खܰ w +BWBͷ$PNQMFUBCMF'VUVSF

4DBMBͷίί͕ࠔΔ w ίϯύΠϧ͕஗͍ w ϓϩδΣΫτ෼ׂɺJNQMJDJUΛଟ༻͠ͳ͍ͱ ͍ͬͨ#, w όΠφϦޓ׵ੑ ʜ
w ϥΠϒϥϦ͕ର৅4DBMBͷόʔδϣϯͰ࠶ίϯ ύΠϧ͢Δඞཁ͋Γʢ͔ͳΓվળ͞ΕͯΔʣ

DMFBODPNQJMFྫ 0 50 100 67s 90s MBA 11-inch Mid 2012
(2.0 GHz intel Core i7) MBP Retina 15-inch Early 2013 (2.7 GHz Intel Core i7) ։ൃ࣌͸ຖճΫϦʔϯίϯ ύΠϧ͢ΔΘ͚Ͱ͸ͳ͍ sbt ͕ࠩ෼ίϯύΠϧͯ͘͠ ΕΔ

1MBZͷಛ௃

3&45GVM class UserController extends Controller { …
def create = Action { val user = … Ok(Json.toJson(user)) } } POST /users controllers.UserController.create

ηογϣϯ؅ཧ w 1MBZࣗମ͸αʔόʔηογϣϯΛ؅ཧ͠ͳ͍ w ΫϥΠΞϯτDPPLJFʹอ࣋͢ΔʢจࣈྻͷΈʣ w ΞϓϦͰੜ੒ͨ͠TFTTJPOJEͰ,743%# ͱؔ࿈͚ͮΔ w εέʔϧΞ΢τ͠΍͍͢࢓૊Έ

)PUEFQMPZ w 4FBTBSͷ୅໊ࢺ w 1MBZ։ൃϞʔυͰ͸Կ΋ઃఆͤͣʹར༻Մ w --ͷΑ͏ͳʢίϯύΠϧআ͘ʣײ֮ w $MBTT-PBEFSΛࠩ͠ସ͑Δಉ͡࢓૊Έ

5ZQFTBGFWJFX w )5.-Λฦͯ͠+40/Λऔಘ͢Δ࣌୅͚ͩͲ w ܕͷߏ଄Λมߋͨ͠ΒΤϥʔʹͳΔ҆৺ײ w ϝʔϧςϯϓϨʔτʹ΋࢖༻Մ w σβΠφʔͱͷڠۀʹ͸޲͍ͯͳ͍ @(user:
User) <span class="name">@user.name</span>

%*"01 w 1MBZ͔Β+43ʹΑΔ%*αϙʔτ w 4DBMBͷػೳΛར༻͢Δͱɺ΄ͱΜͲͷέʔεʹ ͓͍ͯ%*"01Λ࢖Θͳͯ͘΋Մ w ࣮ߦ࣌%*Ͱ͸ͳ͘ɺίϯύΠϧ%* w ίʔυʹॻ͔Εͯݟ͍͑ͯΔ΋ͷ͕͢΂ͯ

؆қͳϞοΫ࣮૷ྫ trait Twitter { def search(keyword: String) =
??? } object Twitter extends Twitter class TwitterController extends Controller { val twitter = Twitter … } class MockTwitterController extends TwitterController { override val twitter = MockTwitter }

τϥϯβΫγϣϯྫ def findUser(name: String) = DB.readOnly { implicit
session => User.find(name) } w τϥϯβΫγϣϯڥքΛϒϩοΫͰදݱ w τϥϯβΫγϣϯ͕͋ΔͱΘ͔Δ҆৺ײ w +BWBͷϥϜμࣜͰ΋࣮ݱՄ %PNB

03. w 4FBTBSͱ͍ͬͨΒ4+%#$ w 4FBTBSΛ࢖͍ଓ͚ΒΕͨཁҼ w 4MJDL4DBMJLF+%#$ʢඇ1MBZґଘʣ w ྲྀΕΔΠϯλʔϑΣʔεΛαϙʔτ w
ϦϑϨΫγϣϯΛ࢖ΘͣʹϚοϐϯά

42-JT%4- sql""" select id,
name, price, created_at from products where id = ${id} """ .map(rs => Product(rs)).single.apply() w 4DBMB ϚΫϩ֦ுʹΑΔ҆શͳ42- CZTDBMJLFKECD w ίʔυͱ42-͕෼཭͠ͳ͍ͨΊ೺Ѳ͠΍͍͢

%#ϚΠάϨʔγϣϯ w 4+%#$(FO w 1MBZ͸ඪ४Ͱ૊ΈࠐΈʢແޮՄೳʣ w 6Q%PXOεΫϦϓτΛ42-Ͱهड़ w ಛఆͷ03.ʹґଘ͢Δ΋ͷͰ͸ͳ͍ w
ϦΫΤετ͝ͱʹมߋΛݕ஌ʢ։ൃϞʔυʣ w 'MZXBZͷϓϥάΠϯ΋͋Γ

%#ϚΠάϨʔγϣϯ

%#ϚΠάϨʔγϣϯ ϒϥϯνʹνΣοΫΞ΢τޙ ΞοϓάϨʔυ42-͕૸Δ ϒϥϯνΛ໭ͤ͹ μ΢ϯάϨʔυ42-͕૸Δ

υΩϡϝϯτ w ւ֎ͷϓϩμΫτͳͷͰӳޠ w ೔ຊޠ΋༗ࢤͷํʑ͕·ͰରԠ w 1MBZ +BWB޲͚ͷ೔ຊޠॻ੶ ։ൃʢ࢓༷มߋʣʴυΩϡϝϯτमਖ਼͕ૣ͘ɺ຋༁ ࡞ۀ౳Λ௥ਵ͢Δͷ͕େม

1MBZίϛϡχςΟ w (JUIVC w #VH*TTVF13Λड͚෇͚͍ͯΔ w (PPHMF(SPVQTʢ೔ຊޠάϧʔϓ΋͋Γʣ w ࣭໰Λͯ͠։ൃऀɺϢʔβʔ͕ฦ৴͢Δ 'PSVN
w (JUUFSʢ೔ຊޠ͸TDBMBKQQVCMJDʣ w νϟοτͰؾܰʹ࣭໰ձ࿩

αϙʔτ w 5ZQFTBGF w &91&354611035ʢӳޠʣ w ࠃ಺ύʔτφʔγοϓ5*4ɺΞοτ΢ΣΞ͞Μ w γεςϜίϯαϧςΟϯάαʔϏε

1MBZͷ޷ҹ৅ͳ఺ w 4DBMBʹΑΔܕ҆શɺϥϯλΠϜΤϥʔ཈ࢭ w ࠇຐज़͕ͳ͍ͨΊɺ͸·ΓͮΒ͍ w ࢼߦࡨޡΛ܁Γฦ͢։ൃ͕͠΍͍͢ w ։ൃ͕ΞάϨογϒͰτϨϯυΛ௥͍΍͍͢

w +BWB΋αϙʔτ͍ͯ͠Δ΋ͷͷɺ4DBMB͕Θ͔ Βͳ͍ͱͭΒ͍ w ޙํޓ׵ੑ͸ظݶΛઃ͚ͯͳͯ͘͘͠Δ w ϑϩϯτ͚ͩमਖ਼ͯ͠ϦϦʔε͢Δʹ΋σϓϩΠ· Ͱʹ͕͔͔࣌ؒΔ 1MBZͷίί͕ࠔΔ "1*αʔόʔͱ͢Δͷ͕Αͦ͞͏ʁ

/FYU4FBTBSͳͷ͔ʁ

/FYU4FBTBSͳͷ͔ʁ w /FYU4FBTBSͰ͸ͳ͍ผͷํ޲ੑ w தେن໛ϓϩδΣΫτ΁ࣗ৴Λ࣋ͬͯਐΊΒΕͳ͍ w 4DBMB1MBZϢʔβʔͷ֬อɺڭҭ͕ඞཁ w ։ൃͷ͠΍͢͞ɺܕʹकΒΕͨݎ࿚ͳΞϓϦΛͭ͘ Γ΍͢͞͸ਐԽ͍ͯ͠Δ
·ͩ·ͩ࢖͍͚͍͖ͭͮͯ·͢ʢࠓͷॴʣ

4FSWMFUͰ4DBMB ΍Γ͍ͨํ 4LJOOZ'SBNFXPSL͕Φεεϝ

΍ͬͺΓ+BWBͳํ 4QSJOH#PPUͷηογϣϯ΁ʂ

seasar_conf_2015.pdf

seasar_conf_2015.pdf

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