秩序あるKotlinの拡張 / Orderly Kotlin Extensions

https://potatotips.connpass.com/event/214754/

Transcript

1. ©2021 Wantedly, Inc.
   டং͋ΔKotlinͷ֦ு
   potatotips #74
   2021/06/23 ٱอग़խढ़
   

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2. ©2021 Wantedly, Inc.
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3. ©2021 Wantedly, Inc.
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   Λ΋ͨͤΔ࿩
   5-%3
   

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4. ©2021 Wantedly, Inc.
   ܦҢ
   

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5. ©2021 Wantedly, Inc.
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6. ©2021 Wantedly, Inc.
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   ௨஌͞ΕΔ
   

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7. ©2021 Wantedly, Inc.
   w ෳ਺ͷGSBHNFOUΛ͏·͘อଘ͍ͨ͠
   fragmentͱ͸
   • σʔλϞσϧΛஅยԽͨ͠΋ͷ
   • ಉ͡ϞσϧΛࢦ͕͢৘ใྔ͕ҧ͏
   • ҰཡͰ͸࠷খݶ
   • ৄࡉͰ͸࠷େݶ
   Ϟσϧ͸ಉ͡ͳͷͰɺ
   ಉ͡ςʔϒϧʹอଘ͍ͨ͠
   ΍Γ͍ͨ͜ͱ
   fragment ProfileMini on Profile {
   userId
   name
   avatarUrl
   }
   fragment ProfileDetail on Profile {
   userId
   name
   avatarUrl
   coverImageUrl
   introduction
   tagline
   statement
   # ... all fields
   }
   

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8. ©2021 Wantedly, Inc.
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   w 42-%FMJHIUʹ͸ࠩΛٵऩͯ͠ɺ͍͍ײ͡ʹอଘ
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9. ©2021 Wantedly, Inc.
   w ୯७ʹ֦ுΛॻ͍ͨ
   Ͳ͏͔ͨ͠ʁ
   fun Db.merge(fragment: ProfileMiniFragment) {
   profilePageQueries.upsertMiniFragment(
   userId = UserId(fragment.userId),
   // ...
   )
   }
   

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10. ©2021 Wantedly, Inc.
    ໰୊఺
    fun Db.merge(fragment: ProfileMiniFragment) {
    profilePageQueries.upsertMiniFragment(
    userId = UserId(fragment.userId),
    // ...
    )
    }
    ໊લʹറΓ͕ͳ͍ɺ໎͏
    mergeDetail, saveͱ͔ϒϨ΍͍͢
    Ҿ਺ʹറΓ͕ͳ͍
    interfaceͰ੍໿Λ͍࣋ͨͤͨʂ
    

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11. ϖʔδλΠτϧ ϖʔδαϒλΠτϧ
    ©2021 Wantedly, Inc.
    JOUFSGBDFPCKFDU಺֦ுؔ਺
    

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12. ©2021 Wantedly, Inc.
    PCKFDU಺֦ுؔ਺
    object Foo {
    fun String.hello() {
    println("Hello, $this")
    }
    }
    object಺ʹ֦ுؔ਺Λ࡞Δ
    ී௨ͷ֦ுؔ਺ͷΑ͏ʹར༻Ͱ͖Δ
    import Foo.hello
    fun main() {
    "World".hello()
    }
    

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13. ©2021 Wantedly, Inc.
    ղܾख๏
    internal interface Merger {
    fun Db.merge(fragment: FragmentT)
    }
    internal object ProfileMiniFragmentMerger
    : Merger {
    override fun Db.merge(fragment: ProfileMiniFragment) {
    profilePageQueries.upsertFragment(
    userId = UserId(fragment.userId),
    // ...
    )
    }
    }
    // Repository
    fun fetchMiniList() {
    val miniList = api.query(GetProfileMiniListQuery())
    db.transaction {
    miniList.forEach { db.merge(it) }
    }
    }
    internal object ProfileDetailFragmentMerger
    : Merger {
    override fun Db.merge(fragment: ProfileDetailFragment) {
    profilePageQueries.upsertFragment(
    userId = UserId(fragment.userId),
    // ...
    )
    }
    }
    // Repository
    fun fetchDetail() {
    val detail = api.query(GetProfileDetailQuery())
    db.merge(detail)
    }
    ֦ுؔ਺Λ࣋ͭ
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14. ©2021 Wantedly, Inc.
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    ΋ͨͤΔ͜ͱ͕Ͱ͖Δ
    w ࠜຊతʹ͸ίʔυੜ੒ͱ͔ͰϘΠϥʔϓϨʔτΛ
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    ·ͱΊ
    

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15. ϖʔδλΠτϧ ϖʔδαϒλΠτϧ
    ©2021 Wantedly, Inc.
    🙇
    

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