High 意識 Android - Mercari Day

by Motohiro Takayama

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High ҙࣝ Android mootoh

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FAQ

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: ϝϧΧϦͬͯ΋͏  ΞϓϦ׬੒ͯ͠Δ͠  ΍Δ͜ͱͳ͍Μ͡Όͳ͍ͷ?

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A: ·ͩ·ͩ·ͩ·ͩ ·ͩ·ͩ·ͩ·ͩ ͋Δ

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2016/02~ • νϟϨϯδ • Χϧνϟʔ • ະདྷ

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2016

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Stats % git diff --shortstat `git log --pretty=%H --since 'last year' | tail -n 1` → 2,029 ﬁles changed, +385,707, -170,628 ■■■■ % git log --pretty=%H --since 'last year' | wc -l → 4,049 commits

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Team of 4 in "# # "

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Team of 4→7 in "#$ $ # "

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ެ҆9՝

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“զʑͷؒʹ͸ɺνʔϜϓϨʔͳͲͱ͍͏ ౎߹ͷΑ͍ݴ͍༁͸ଘࡏͤΜɻ ͋Δͱ͢Ε͹ελϯυϓϨʔ͔Βੜ͡Δɺ νʔϜϫʔΫ͚ͩͩɻ” — ߥרେี, 2002

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ެ҆9՝Ϟσϧ • ߈֪ػಈୂ S.A.C • ཱࣗͨ͠ଟ༷ͳϝϯόʔ • ݸʑͷ؍఺͔ΒϓϩμΫτ/૊৫ͷվળΛ  ࣮ફ͢Δ

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FAQ

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: ̓ਓ΋ΤϯδχΞ͍Ε͹ े෼Ͱ͠ΐ

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A: ·ΔͰ଍Γͳ͍ • #, ", $ ͦΕͧΕʹ෼͔Ε͍ͯΔ • ϓϩδΣΫτ͋ͨΓ 1~2ਓ • ΋ͬͱ͍Ε͹΍ΕΔ͜ͱΛ૿΍ͤΔ

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Challenges

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No content

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ଠฏ༸Λ·͙ͨ Code Review " PR # Review " Revise # Review # LGTM " Revise " Merge ☀ ☀ ☀ ☀ PR ͷ଺ཹ͕࣌ؒ௕͘ͳΔ → ϦϦʔε஗

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Solution A

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6:30am standup meeting • " ϝϯόʔ͕Έͳ༮ࣇ࣋ͪͩͬͨ  → ڧ੍ૣى͖ • # ʹ༏͍͠ (ன) • Նͩͬͨ → ே໌Δ͍ͷͰૣى͖͠΍͍͢  → ࢼ͠ʹ΍ͬͯΈΑ͏

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݁Ռ: • • Sync ͷճ਺͕૿͑ͨ͜ͱʹΑΓɺϨϏϡʔͷޮ཰ ্͕͕ͬͨ • • ࢠ͕6am ʹى͖ΔͷͰग़੮Ͱ͖ͳ͍ • ҙਤͷ֬ೝͳͲ͸Ͱ͖Δ͕ PR ϕʔεͳͷͰ async

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Solution B https://screenhero.com

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ScreenHero • ϦϞʔτϖΞϓϩ • protected void synchronized review { … } • ࣌ؒ͸߹ΘͤΔඞཁ͕͋Δ

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݁Ռ • ίϛϡχέʔγϣϯͷଳҬ͕޿͍ • ࢖͍෼͚ • ॏ͍ϨϏϡʔͷ࣌ʹ໾ཱͭ • PR Ͱ2-3౓΍ΓऔΓͯͯ͠Β͕͔ͪ͋ͳ͍ → ͭͳ͍Ͱνϟνϟͬͱղܾ

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# " $ Or…

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๺ۃ Meeting • ཱྀ͍͍ͩͨඅ30~100ສ • ͍͍ͩͨ౳ڑ཭ • פ͍⛄️

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஌ݟ • ૣى͖͸Ωπ͍͕໾ʹཱͭ • ෳࡶ౓ʹԠͯ͡ίϛϡχέʔγϣϯͷଳҬΛม͑Δ • ͕࣌ࠩൃੜ͠ͳ͍Α͏ʹνʔϜΛ෼͚Δͷ΋ • ๺ۃΛఘΊͳ͍❄

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Challenges

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https://commons.wikimedia.org/wiki/File:Adobe_guadalupe_wine_barrel.jpg ख़੒

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ख़੒ίʔυ • ϓϩμΫτ։ൃΛ࠷଎ͰલʹਐΊ͖ͯͨ • 3೥ख़੒ (౰࣌) • ݹΊͷςΫϊϩδ • (ಛʹ)৽͍͠ϝϯόʔʹͱͬͯมߋͮ͠Β͍

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ݹΊͷςΫϊϩδ 34 • Networking: • HttpUrlConnection / Apache HttpClient  with ൿ఻ͷϨγϐ • Async Operation: • Callback Interface / EventBus • Singletons • Giant Activities

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→एฦΓ 5 • Networking: okhttp • Async Operation: RxJava • Singletons: Dagger2 • Giant Activities: MVVM

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ϦϑΝΫλϦϯά͍͕ͨ͠… • Ҋ݅։ൃͰύπύπ • ϦϑΝΫλϦϯά͢Δ͜ͱͰσάϨ͢Δ͜ͱ ͕͋ͬͨ • QA ͔Βͷ৴པஷۚ㽊

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࡞ઓ⚽ • Ҋ݅ͷεέδϡʔϧʹ৫ΓࠐΉ • ϦϑΝΫλͨ͠ํ͕ૣ͍ূڌΛ஝ੵ͢Δ • ςετͰσάϨΛ๷ࢭ͠ɺ৴པΛஷΊΔ

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஌ݟ • ৽͍͠ػೳ࣮૷Λ͢ΔલʹϦϑΝΫλϦϯά • εέδϡʔϧʹ৫ΓࠐΉ • ͡Θ͡Θ޿͛Δ • ಆ͍ଓ͚ΔɺఘΊͳ͍

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Challenges

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# " 1 → 8 0 → 1 Product Phase

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$ # " 0 → 1 8 → 10 1 → 8 Product Phase

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Repository # " + $ • ONE OK REPOSITORY • ﬂavor Ͱ෼͚͍ͯͨ

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໰୊ • มߋͮ͠Β͍ • isJP(), isUS(), isUK() • #޲͚ͷมߋΛ͍͚ͨͩ͠ͳͷʹ"ͷίʔυΛؾʹ͠ͳ͍ͱ͍͚ͳ͍ • ࣌ࠩ໰୊ (ઌड़) • QA େม • Өڹൣғ: #޲͚ͷมߋ͚ͩͲɺ΄Μͱʹ"͸յΕͯͳ͍? • Region ͝ͱͰ phase ͕ҟͳΔ • ༏ઌ౓΍։ൃελΠϧ΋ҟͳΔ

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Solutions • ͻͱ·ͣ Branch Λ෼͚ͨ ⎇ • Fork ͨ͠Β໭Δͷ͸ࠔ೉ • ΋ͬͱ Region ͕૿͑ͨΒ?

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Challenges

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ID ج൫

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ID ج൫ • Single Sign On తͳ΋ͷ • Mercari <-> Souzoh • iOS / Android ͷϥΠϒϥϦॻ͘͜ͱʹͳͬͨ

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ݸਓతνϟϨϯδ • Kotlin • ຊମΞϓϦʹಋೖ͸᪳᪯ΘΕΔ͕ϥΠϒϥϦʹͳΒ • gRPC • HTTP/2, Protobuf, ΫϩεϓϥοτϑΥʔϜ

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gRPC "# ໰୊ • #-"Ͱ gRPC ௨৴͢Δͱࢗ͞ΔσόΠε͕ • " Ͱ͸໰୊͕ൃੜ͠ͳ͍ • ϥΠϒϥϦͷԞਂ͍ͱ͜Ζʹ໰୊͕͋Γͦ͏ • ී௨ͷ௨৴͸໰୊͕ͳ͍ • ͔͕࣌ؒ͠͠ͳ͍⌛

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gRPC-gateway ? • gRPC ͷαʔϏεʹ RESTful JSON API ͰΞΫ ηεͰ͖Δ • ී௨ͷ HTTPS ΞΫηε͸ͭͳ͕Δ • ໰୊ճආ

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஌ݟ • Kotlin • ϥΠϒϥϦɺςετͳͲ͔Β߈ΊΔ → μϝʔδগͳ͍ • ϨϏϡʔ͞ΕͮΒ͍ • gRPC • REST ͸ಀ͕͛ͩ໾ʹཱͭ • ίϯτϦϏϡʔγϣϯͰ͖Δ༨༟Λ࢒͓ͯ͘͠

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Future

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·ͩ·ͩ·ͩ·ͩ·ͩ·ͩ͋Δ • ܻҧ͍ʹͨ͘͞Μͷ A/B ςετΛ  ؆୯ʹճͤΔ࢓૊Έ • ଞ Region ্ཱͪ͛ • Inter-Region ചങ • 3D ग़඼ɺ VR γϣοϐϯά (ໝ૝)

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Wrap Up

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Wrap up • ·ͩ·ͩνϟϨϯδ͕͋Δ • ٕज़త & ϓϩμΫτత • ެ҆̕՝Ϟσϧ

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“و༷ɺ͍͍࿹Λ͍ͯ͠Δͳɻ ࠓ͔Βࢲͷ෦ԼʹͳΕɻ” — ૲ಽૉࢠ, 2004

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