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例外は"投げない"〜Scalableエラー処理入門
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YuitoSato
December 22, 2017
Technology
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例外は"投げない"〜Scalableエラー処理入門
https://d-cube.connpass.com/event/74106/
「教養としてのScala ~ そろそろ始めてみたい2017冬」のLTのひとつです。
YuitoSato
December 22, 2017
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Transcript
ETDBMB ྫ֎l͛ͳ͍z d4DBMBCMFΤϥʔॲཧೖd ϏζϦʔνࠤ౻༗ే
ETDBMB ͢ਓ w ৽ଔ w ֶੜͷࠒ3VCZ w ۀͰ4DBMBͱ5ZQF4DSJQU w 4DBMBྺ
ࠤ౻༗ేʢ!:VJJJUPUPʣ
ETDBMB Έͳ͞Μ
ETDBMB ྫ֎
ETDBMB ͛ͯ·͔͢ʁ
ETDBMB ྫ֎
ETDBMB ัͬͯ·͔͢ʁ
ETDBMB ྫ֎Λ͛ͳ͍ Τϥʔॲཧ͋Γ·͢ ͱ͍͏Λ͠·͢
ETDBMB ࠓͷΰʔϧ w 4DBMBͷΤϥʔॲཧΛΔ w ྫ֎Λ͛ΔҎ֎ͷΤϥʔॲཧ͕͋Δ͜ͱΔ
ETDBMB Τϥʔॲཧͷྺ࢙ ͬ͘͟Γ PS/VMM࣌ ྫ֎ॲཧ ΤϥʔʹҙຯΛ͍࣋ͨͤͨ Τϥʔ·ͱΊͯॲཧ͍ͨ͠
ETDBMB ྫ֎ॲཧͱʁ ݺͼग़͠ݩ ϝιου */ Τϥʔʂ $BUDIઅ ίʔϧελοΫΛͨͲΔ 065
ETDBMB ͭΒ͍͜ͱ͋Δ ݺͼग़͠ݩ ϝιου 065 ίʔϧελοΫΛͨͲΔ $BUDIઅ
ETDBMB ੍ޚϑϩʔ͕̎ͭ
ETDBMB ͭΒ͍͜ͱᶄ ݺͼग़͠ݩ ϝιου 065 Τϥʔʂ ίʔϧελοΫΛͨͲΔ ❓❓ */
ETDBMB $BUDI͠ΕΔ
ETDBMB ͭΒ͍͜ͱ·ͱΊ ੍ޚϑϩʔ͕ෳࡶ ΤϥʔॲཧΕ
ETDBMB ͍ͨ͜͠ͱ·ͱΊ ੍ޚϑϩʔΛཧ ΤϥʔॲཧΛڧ੍
ETDBMB ੍ޚϑϩʔΛཧ͢Δʹ ݺͼग़͠ݩ ϝιου &SSPSPS ਖ਼ৗ &SSPSPS ਖ਼ৗ ΤϥʔҰͭͷΦϒδΣΫτͱͯ͠ฦ͢
ETDBMB ͦ͜Ͱ4DBMBͩʂ
ETDBMB ͦ͜Ͱ&JUIFSͩʂ
ETDBMB 4DBMBͷ&JUIFSͱʁ w ̎ͭͷΦϒδΣΫτΛอ࣋Ͱ͖ΔΫϥε w ࣦഊ࣌ -FGU ͷΦϒδΣΫτɺޭ࣌ 3JHIU ͷΦϒδΣΫτΛอ࣋
w ̎ͭಉ࣌อ࣌Ͱ͖ͳ͍ &JUIFS -FGU 3JHIU
ETDBMB ࣮ࡍʹॻ͍ͯΈΑ͏ def signUp(email: String): Either[Error, User] = { If
(email.length < 5) { Left(Error(“Too Short Email!”)) } else { Right(User(email)) } } case class Error(msg: String) case class User(email: String) ฦΓ ϝιου new & return Class
ETDBMB ࣮ࡍʹॻ͍ͯΈΑ͏ def signUp(email: String): Either[Error, User] = { If
(email.length < 5) { Left(Error(“Too Short Email!”)) } else { Right(User(email)) } } case class Error(msg: String) case class User(email: String) &JUIFS -FGU &SSPS 3JHIU 6TFS
ETDBMB ͭ·Γ͜͏͍͏͜ͱ ݺͼग़͠ݩ TJHO6Q &JUIFS -FGU &SSPS 3JHIU 6TFS &JUIFS
-FGU &SSPS 3JHIU 6TFS String
ETDBMB Τϥʔॲཧڧ੍Ͱ͖Δ def main(args: Array[String]): Unit = { val either=
signUp(“
[email protected]
”) either match { case Right(user) => logger.info(user.email) case Left(error) => logger.error(error.msg) } } ޭͳΒ ࣦഊͳΒ
ETDBMB ඒ͍͠ʢओ؍ʣ
ETDBMB ͓͞Β͍ w ΤϥʔPSਖ਼ৗͱ͍͏Λฦ੍ͯ͠ޚϑϩʔΛཧ͢Δ w &JUIFSΤϥʔॲཧΛڧ੍Ͱ͖Δ w ʢ͝ར༻ܭըతʹʣ
ETDBMB ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ