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反化卅皮永弁穴奈弁
in Scala
畛鰓輿怮檔
id:tarao @oarat
2015-08-01
@ Scala 憝昹 Summit 2015

赻撩畿賡
靡ゴ ?
中卅
畛鰓? ?
曰氏凶欠丹
輿怮檔? (id:tarao @oarat)
2008-08 反化卅奶件正奈件
2008-10 反化卅失伙田奶玄 (皮永弁穴奈弁民奈丞)
2010-04 ゜掛悝胍淥鶸頗杻�e旃噶�T (DC1)
2013-04 反化卅淏扦�T
2013-12 皮永弁穴奈弁民奈丞
? 失伙打伉朮丞挌今氏
? 𨈘坰撮胍 > 辻迮悝� ? 失玉氾弁
? 郔輪反偞�仄凶曰價屜敵曰卅窒煦毛童絞仄凶曰

赻撩畿賡
靡ゴ ?
中卅
畛鰓? ?
曰氏凶欠丹
輿怮檔? (id:tarao @oarat)
Scala 窃: 4仳堎
? slick-jdbc-extension
? 倰伊矛伙及仿丞母�呾
? Software Design 2015 爛 8 堎瘍
湮悝媆測反
? 旃噶弅: 倰燴�, 皿伕弘仿丞砩庤�, 偩隴盓堔炵
? OCaml 互鼠蚚惤
? ?
gradual typing
𪊓筳腔倰葆仃?及 Java 炵晟惤尺及𡛟蚚毛旃噶

反化卅皮永弁穴奈弁 in Scala

中切井日釬曰卅云仄!
Scala匹!

中切井日釬曰卅云仄!
Scala匹!
友日中
? 戊奈玉矛奈旦及滔湮趙?橾冓趙尺及��I
? 跦掛腔卅失奈平氾弁民乓及婬偞�

DISCLAIMER
? 囀⺍反嶱逃笢及手及
? 灍蕣及伉伉奈旦媆卞反劐載及褫夔俶丐曰
? 郔笝腔卞升丹卅勻凶井鼠桶允月井升丹井帤隅

�傖
? ゴ摽匹 Perl/Scala 卞煦賃
? 戊失反 B!眕俋井日手瞳蚚
? Presso
? B!KUMA
申亙奈 (Perl)
? 交奈扒庲偩
? HTML 及伊件母伉件弘
戊失 (Scala)
? API 扔奈田
? 扦囀價屜腔�醱

Why Scala?
? 劐載及屾卅中笭猁窒煦反�檣卞仄凶中
? 倰假�俶
? 玉丟奶件闒�偞�
? Mackerel 民奈丞匹及妏蚚灍�
? LL �卞手𤩸五支允中
? 巨件斥瓦失及民奈丞��互⺍眢卞卅月
? Perl 午及陑笢毛旌仃月
? ��腔卞反
? 陔晟惤毛爀⻌允月卅日憝杅倰匹卅中午偝今氏
? �中噙腔倰葆晟惤匹卅中午偝今氏
? 倰芢�卅中午偝今氏

Why Perl?
? 螿楛卞劐載互丐勻化手嶱逃互㜭
? 犯扒奶瓜手 HTML 氾件皿伊奈玄毛揖月
? 戊件由奶伙仄卅云今卅仁化方中
? 伕奈市伙嶱逃虐噫匹及釬𦲀互⺍眢
? 悝�戊旦玄 0
? 庲偩引歹曰反僕籵 Perl 乒斥亙奈伙匹支曰凶中
? 丐午匹𡃤化化引凶釬曰眻允井手仄木卅中

白伊奈丞伐奈弁白伊奈丞伐奈弁白伊奈丞伐奈弁白伊奈丞伐奈弁白伊奈丞伐奈弁白伊奈丞伐奈弁白伊奈丞伐奈弁

仇木引匹 (Perl)
菴 1 岍測 Apache mod perl 奻及�眢腔卅手及
菴 2 岍測囀庨及 Perl 唳 RoR 腔卅笭綠卅手及
? 悝�戊旦玄詢
? 赻蚕互五井卅中
菴 3 岍測情中白伊奈丞伐奈弁及摩磁
? 方仁匹五凶苤乒斥亙奈伙及瞎心磁歹六
? 赻蚕僅互詢仁⻌木杸尹褫夔
? ? YAPC::Asia 2015 talk by id:hitode909

陔戊失扔奈田 (Scala)
Web
? Scalatra
? APISchema及Scala 唳 (軑隅)
DB
? Slick 3.0
? slick-jdbc-extension
? 黃赻及屯氏曰卞妏丹𦵴
氾旦玄
? ScalaTest

Web白伊奈丞伐奈弁
Scalatra
? API 扔奈田卅及匹�匼匹方中
? 殿曰�互 Any 卅及珃卅及匹仿永皿仄化瞳蚚
APISchema
? Perl 匹及灍�毛啋卞 Scala 唳毛灍蚾軑隅
? ��g卅 DSL 匹隅膽
? JSON Schema 卞方月伉末奈旦隅膽
? 由旦仍午及伉弁巨旦玄午伊旦禾件旦隅膽
? 肮元隅膽井日赻�汜傖
? 玉平亙丟件玄
? 伙奈氾奴件弘�I燴

DB白伊奈丞伐奈弁
Slick 3.0
? 準肮ヽ DB 失弁本旦手瞳蚚仄凶中
? 恅趼蹈娗嶲卞方月汜 SQL 及心匹瞳蚚
? 軑砑俋及弁巨伉互汜傖今木月及毛滅什
? 奶件白仿巨件斥瓦失匹手掂戶月方丹卞
? (丐午匹弁巨伉申伙母爀⻌及褫夔俶反丐月)
? ��乒斥亙奈伙 slick-jdbc-extension
? 恅趼蹈娗嶲及伉旦玄及㜳中卅升毛�趙
? 市仿丞靡匹及磐彆倰尺及穴永疋件弘
? ? ◇Scala 匹汜 SQL - Slick 及 SQL 娗嶲赽卞伉旦玄毛傾允坻◆

DB白伊奈丞伐奈弁
黃赻𦵴
? DB 奶件旦正件旦奪燴
? 穴旦正奈/旦伊奈皮ピ曰杸尹
? 氾旦玄媆及皿伕本旦黱 DB 煦褩
? 乒奈玉奪燴 (玄仿件扒弁扑亦件, 準肮ヽ)
? 伉弁巨旦玄旦伊永玉仍午及準肮ヽ諉適杅奪燴

玉丟奶件闒雄扢數玉丟奶件闒雄扢數玉丟奶件闒雄扢數玉丟奶件闒雄扢數玉丟奶件闒雄扢數玉丟奶件闒雄扢數玉丟奶件闒雄扢數

導皮永弁穴奈弁匹反
DDD勻弔中仇午手支日木化中凶
? 失皿伉弗奈扑亦件扔奈申旦
? 玉丟奶件扔奈申旦
? 玉丟奶件乒犯伙
? CQRS (戊穴件玉弁巨伉��煦褩)

導皮永弁穴奈弁匹反
囮㷍
? 交申平正旦晟惤互卅中引引筳氏分
? e.g. 云𠸎卞⻌曰 or 白巧伕奈
? e.g. 3 勾及☆奶件正伊旦玄★衙癩
? 源�互竩菁今木卅井勻凶
? 失皿伉𦵴午戊件玄伕奈仿𦵴互誑中卞ペ妘
? 囀庨及 Perl 唳 Active Record 腔 O/R 穴永由
? 乒犯伙, 扔奈申旦, 伉禾斥玄伉互��珨极
? 輪�及坻 Perl 皿伕母弁玄匹反引午手卞卅勻凶
? Perl 及癹賜
? 奶件正白尼奈旦互晟惤辻夔卞卅中

五切氏午DDD仄凶中!
? 衄祩及扦囀辭�頗毛灍囥
? 準巨件斥瓦失丟件田奈午手僕衄?荽�
? Scala 匹及方中支曰源毛耀坰

源�
? 伉禾斥玄伉反奶件正白尼奈旦 (甡湔憝�S欄�及埻�t)
? 玉丟奶件卞灍蚾奻及飲磁毛厥切煋引卅中

�氏分萸午釬煾
? 甡湔俶及蛁⻌升丹允月井
? Cake Pattern 毛搪婡妸蚚
? has-a 憝�S毛竘仁午五及 N+1 �觳
? 憝�S乒瓜玉毛隅膽
? 玄仿件扒弁扑亦件升仇匹�月井
? 中勻凶氏婡苤卅�� (奶件白仿𦵴) 匹
? �极腔卞磐彆淕磁俶

Cake Pattern
package repo
trait SomeComponent {
def someLoader: SomeLoader
// 伉禾斥玄伉奶件正白尼奈旦
trait SomeLoader {
def find(...) = ...
} }
package db
trait SomeComponent
extends repo.SomeComponent {
def someLoader: SomeLoader =
SomeLoader
// 灍蚾
object SomeLoader
extends SomeLoader { ... }
}
package app
trait ServiceComponent {
// 甡湔及隴尨
self: repo.SomeComponent =>
trait SomeService {
...
someLoader.find(...)
...
} }
package main
object AppRoot
extends db.SomeComponent
with app.ServiceComponent
with ...

Cake Pattern
禾奶件玄
? trait 毛⻌木赽卞仄化云仁
? 妏丹�反赻煦倰失用氾奈扑亦件匹甡湔毛隴尨
? AppRoot卞反灍蚾戊件禾奈生件玄毛磐磁
? TestRoot脹毛蚚砩仄化�e灍蚾卞⻌木杸尹手褫
? �g极氾旦玄匹戊件禾奈生件玄�g弇匹⻌木杸尹
? �极匹氾旦玄蚚 DB 甩件玉仿灍蚾卞⻌木杸尹
object TestRoot
extends repo.SomeMockedComponent
with app.ServiceComponent
with ...

N+1�觳1 璃及�磁
val bookmark: Bookmark = ...
val locaiton: Location = bookmark.toLocation
// SELECT * FROM location WHERE ...
n 璃及�磁: n + 1 隙及弁巨伉互斛猁
val bookmarks: Seq[Bookmark] = ...
// SELECT * FROM bookmark WHERE ...
val locations: Seq[Location] = bookmarks.map(_.toLocation)
//
... ℅ n
掛絞反六中兮中 2 隙匹𦤦戈
val locations: Seq[Location] =
locationLoader.findAll(bookmarks.map(_.locationId))
// SELECT * FROM location WHERE location_id IN (...)

N+1�觳隙旌習(1) JOIN
賤𢜪源楊
? bookmarks午 locaitons毛中勻巴氏卞竘仁
? JOIN 仄化竘仃壬褫夔
�觳萸
? 珨啜腔卞反 JOIN 仄凶仁卅中�磁手丐月
? e.g. bookmarks互⻌薯午卅月扔奈申旦囀
? NG: 灍蚾奻及飲磁互乒犯伙及竘五源毛酘衵允月

N+1�觳隙旌習(2) 豇眻卞
賤𢜪源楊
? 化中友中卞憝�S珂毛竘中化仁月
�觳萸
? 啋及猁匼午�𡛟勿仃凶中�磁卞醱給
val locations: Seq[Location] =
locationLoader.findAll(bookmarks.map(_.locationId))
val id2loc = locations.map{ l => l.id -> l }.toMap
val bookmarkAndLocationList: Seq[(Bookmark, Location)] =
bookmarks.map{ b => (b, id2loc(b.locationId)) }

憝�S乒瓜玉
class BookmarkRelation(b: Bookmark) {
def toLocation: Monad[Location, Bookmark] =
HasA.Monadic(b, new HasA[Bookmark, Location] { ... }) }
implicit def bookmarkRel(b: Bookmark) =
new BookmarkRelation(b)
val bookmark: Bookmark = ... // 1 璃及�磁
val location: Option[Location] = bookmark.toLocation
val bookmarks: Seq[Bookmark] = ... // n 璃及�磁

憝�S乒瓜玉
? toLocation及殿曰�反乒瓜玉及奶件旦正件旦

憝�S乒瓜玉
? 弁巨伉反乒瓜玉井日磐彆尺及做怱劐𡥼匹逃汜

憝�S乒瓜玉
? 弁巨伉反乒瓜玉井日磐彆尺及做怱劐𡥼匹逃汜
? 憝�S及竘五源反乒瓜玉汜傖媆卞硌隅

憝�S乒瓜玉
乒瓜玉及由仿丟奈正
? 恚杅璃及竘五源及心毛灍蚾
new HasA[Bookmark, Location] {
def map(bookmarks: Seq[Bookmark]): Seq[Location] =
locationLoader.findAll(bookmarks.map(_.locationId)) }
做怱劐𡥼
? Seq[] 毛珨𠸎卞劐𡥼仄化 N+1 �觳毛賤𢜪
implicit def run[R, Q](
ms: Seq[Monad[R, Q]]
): Seq[R] = ... // HasA.map 毛妏勻凶�I燴
implicit def toResultOption[R, Q](
m: Monad[R, Q]
): Option[R] = run(Seq(m)).headOption

憝�S乒瓜玉
啋及猁匼午�𡛟勿仃月�磁
type JoinBookmarkLocation =
Join[(Bookmark, Location), LocationId, Bookmark, Location]
def withLocation = Join.Monadic(b, new JoinBookmarkLocation {
def map(bs: Seq[Bookmark]): Seq[Location] = ...
def leftKey(b: Bookmark): LocationId = b.locationId
def rightKey(l: Location): LocationId = l.id
def merge(b: Bookmark, l: Location) = (b, l)
})
val bookmarkAndLocationList: Seq[(Bookmark, Location)] =
bookmarks.map(_.withLocation)
? ID 卞方月憂勿仃反劐𡥼媆卞支勻化仁木月

�仄仁反
OSS 趙今木凶灍蚾
? github.com/tarao/bullet-scala
゜掛惤匹及賤掊
? bullet-scala: N+1 弁巨伉�觳毛隙旌允月

CI
docker 匹
? �g珨及.jar 白央奶伙毛汜傖
? 氾旦玄毛灍俴
? 嶱逃蚚石旦玄虐噫 (軑隅)
? chroot仄化掛楓虐噫卞?
汜傖仄凶.jar 白央奶伙
? 氾旦玄卞妏蚚 (掛楓午肮珨田奶瓜伉)
? 犯皿伕奶卞妏蚚

引午戶
? 反化卅皮永弁穴奈弁毛釬曰卅云仄
? Perl 午 Scala 及甩奶皮伉永玉
? 情中白伊奈丞伐奈弁毛妸蚚
? Scala 匹及 DDD 灍犛源楊毛耀坰
? docker 匹乒母件卅 CI

WE ARE HIRING
? Scala 巨件斥瓦失羯揋躁摩笢
? 𡌂儔 / 儔飲升切日及マ�匹手褫

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反化卅皮永弁穴奈弁 in Scala

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