kotlinx.serialization

Transcript

1. kotlinx .serialization @takuji31 J Lang Fest Kansai Online #1

2. ࣗݾ঺հ • @takuji31 • Takuji Nishibayashi • Hatena Co., Ltd.

   • App Team • ίϛοΫDAYS • ΧΫϤϜ • δϟϯϓϧʔΩʔʂ

3. ࣗݾ঺հ • Android • Kotlin • (Flutter / iOS /

   Material Design etc.) • ! https://blog.takuji31.jp • " https://nazuna.takuji31.jp • # https://photo.takuji31.jp

4. ΞϓϦέʔγϣϯͰJSON΍YAML ΍XMLΛಡΜͩΓॻ͍ͨΓͯ͠·͢ ͔ʁ

5. AGENDA • kotlinx.serializationʹ͍ͭͯ • kotlinx.serializationͷ࢖͍ํ • ڝ߹ϥΠϒϥϦʔͱͷൺֱ

6. kotlinx. serializationʹ͍ͭͯ

7. Kotlin੡ͷγϦΞϥΠθʔγϣϯϥ ΠϒϥϦʔ

8. Kotlinެࣜ

9. ϚϧνϓϥοτϑΥʔϜରԠ

10. JSONҎ֎ʹ΋ෳ਺ͷϑΥʔϚοτ ʹରԠ

11. ϦϑϨΫγϣϯͳ͠

12. kaptෆཁ

13. Null SafetyରԠ

14. github.com/Kotlin/ kotlinx.serialization

15. kotlinx. serializationͷ࢖͍ํ

16. ηοτΞοϓखॱ

17. plugins { kotlin("multiplatform") // or kotlin("jvm") or kotlin("android") etc. kotlin("plugin.serialization")

    version "1.4.10" // Kotlin version } kotlin { sourceSets { val commonMain by getting { dependencies { implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.0.0-RC2") } } } }

18. or github.com/Kotlin/ kotlinx.serialization#setup

19. JSON

20. { "id": 1, "title": "సੜͨ͠ΒKotlinͩͬͨ݅", "author": "@takuji31", "stories": [ {

    "id": 1001, "number": 1, "title": "ਆ༷ͷϛεͰϓϩάϥϛϯάݴޠʹసੜͨ͠" } ] }

21. Ϋϥεఆٛ

22. @Serializable data class Comic( val id: Long, val title: String,

    val author: String, val stories: List<Story>, ) @Serializable data class Story( val id: Long, val number: Int, val title: String, )

23. γϦΞϥΠζ

24. val comic = Comic( id = 1L, title = "సੜͨ͠ΒKotlinͩͬͨ",

    author = "@takuji31", stories = listOf( Story( id = 1001L, number = 1, title = "ਆ༷ͷϛεͰϓϩάϥϛϯάݴޠʹసੜͨ͠", ), ), ) Json.encodeToString(Comic.serializer(), comic)

25. val comic = Comic( id = 1L, title = "సੜͨ͠ΒKotlinͩͬͨ",

    author = "@takuji31", stories = listOf( Story( id = 1001L, number = 1, title = "ਆ༷ͷϛεͰϓϩάϥϛϯάݴޠʹసੜͨ͠", ), ), ) Json.encodeToString(comic)

26. {"id":1,"title":"సੜͨ͠ΒKotlinͩͬͨ","author":"@takuji31","stories":[{"id":1001,"number":1,"title":"ਆ༷ͷϛεͰϓϩάϥϛϯάݴޠʹసੜͨ͠"}]}

27. !

28. val comic = Comic( ... ) val format = Json

    { prettyPrint = true } format.encodeToString(comic)

29. { "id": 1, "title": "సੜͨ͠ΒKotlinͩͬͨ", "author": "@takuji31", "stories": [ {

    "id": 1001, "number": 1, "title": "ਆ༷ͷϛεͰϓϩάϥϛϯάݴޠʹసੜͨ͠" } ] }

30. prettyPrintҎ֎ͷΦϓγϣϯ͸ docs/json.md#json-configuration

31. σγϦΞϥΠζ

32. val json = //get json val comic: Comic = Json.decodeFromString(json)

33. val format = Json { ignoreUnknownKeys = true } val

    json = //get json val comic: Comic = format.decodeFromString(json)

34. ڝ߹ϥΠϒϥϦʔ ͱͷൺֱ

35. ൺֱ͢ΔϥΠϒϥϦʔ • Gson • Jackson • Moshi

36. σγϦΞϥΠζ࣌ͷܗࣜ

37. ܗࣜ • ϦϑϨΫγϣϯ • kapt • GradleϓϥάΠϯ

38. ֤ϥΠϒϥϦʔͷσγϦΞϥΠζܗࣜ ϥΠϒϥϦʔ ܗࣜ Gson ϦϑϨΫγϣϯ Jackson ϦϑϨΫγϣϯ Moshi ϦϑϨΫγϣϯ/kapt kotlinx.serialization

    GradleϓϥάΠϯ

39. KotlinͷNull SafetyରԠ

40. ֤ϥΠϒϥϦʔͷNull SafetyରԠ ϥΠϒϥϦʔ ରԠ/ඇରԠ Gson ඇରԠ Jackson ରԠ(jackson-module-kotlin) 1 Moshi

    ରԠ kotlinx.serialization ରԠ 1 https://github.com/FasterXML/jackson-dataformats-text

41. JSONҎ֎ͷϑΥʔϚοτ΁ͷରԠ

42. ֤ϥΠϒϥϦʔͷରԠϑΥʔϚοτ(Ұ෦) ϥΠϒϥϦʔ ରԠϑΥʔϚοτ Gson ͳ͠ Jackson YAML/CSV/XML/Properties/Protobuf 1 2 Moshi

    ͳ͠ kotlinx.serialization YAML/XML/Properties/Protobuf 3 3 https://github.com/Kotlin/kotlinx.serialization/blob/master/formats/README.md 2 https://github.com/FasterXML/jackson-dataformats-binary 1 https://github.com/FasterXML/jackson-dataformats-text

43. Kotlin Multiplatform Project(KMP/ KMM)ରԠ

44. ֤ϥΠϒϥϦʔͷରԠϑΥʔϚοτ(Ұ෦) ϥΠϒϥϦʔ ରԠ/ඇରԠ Gson ඇରԠ Jackson ඇରԠ Moshi ඇରԠ kotlinx.serialization

    ରԠ

45. ·ͱΊ

46. ·ͱΊ • kotlinx.serialization͸KotlinެࣜγϦΞϥΠθʔγϣϯϥΠϒϥϦʔ • ηοτΞοϓͨ͠Β؆୯ʹ࢖͑Δ • GradleϓϥάΠϯʹΑΔίʔυੜ੒ͳͷͰ࣮ߦ࣌/Ϗϧυ࣌ͷύϑΥʔϚϯ ε͕ྑ͍ • JSONҎ֎ʹ΋ଟ਺ͷϑΥʔϚοτʹରԠ

    • ϚϧνϓϥοτϑΥʔϜରԠͰiOS΍αʔόʔαΠυͰ΋࢖͑Δ • ϚϧνϓϥοτϑΥʔϜରԠ͍ͯ͠ͳ͍ϑΥʔϚοτ΋͋ΔͷͰ஫ҙ

47. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠