kotlinx.serialization

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·ͨ͠