Kotlin Beyond Android: 2019

1. Kotlin Beyond Android Guillermo Orellana @wiyarmir November 2019 Droidcon San Francisco
3. We are in the US! And we are hiring in Los Angeles! Backend, iOS, Android
8. Ctrl+Shift+Alt+K ⌘+⇧+⌥+K
11. Backend
13. fun main(args: Array<String>) { embeddedServer(Netty, 8080) { routing { get("/") { call.respondText("Hello World") } } }.start() } http://ktor.io/
14. API Tests #
15. @Test fun `when userId and password provided then user is created`() = testApp(mockStorage) { handleRequest(HttpMethod.Post, endpoint) { addHeader( HttpHeaders.ContentType, ContentType.Application.FormUrlEncoded.toString() ) setBody( listOf( "userId" to testId, "password" to testPassword ).formUrlEncode() ) }.apply { assertThat(response.status(), equalTo(HttpStatusCode.Created)) }
16. Deploying
18. $ git push heroku master
19. Counting objects: 155, done. Delta compression using up to 36 threads. Compressing objects: 100% (50/50), done. Writing objects: 100% (89/89), 17.45 KiB | 0 bytes/s, done. Total 89 (delta 33), reused 75 (delta 19) remote: -----> Cleaning up!!... remote: -----> Building keynotedex from herokuish!!... remote: -----> Adding BUILD_ENV to build environment!!... remote: -----> Gradle app detected remote: -----> Installing JDK 1.8!!... done remote: -----> Building Gradle app!!... remote: -----> executing ./gradlew stage remote: To honour the JVM settings for this build a new JVM will be forked. Please consider using the daemon: https:!//docs.gradle.org/4.10.2/userguide/gradle_daemon.html. remote: Daemon will be stopped at the end of the build stopping after processing remote: > Task :buildSrc:discoverMainScriptsExtensions remote: > Task :buildSrc:compileKotlin remote: > Task :buildSrc:compileJava NO-SOURCE remote: > Task :buildSrc:compileGroovy NO-SOURCE remote: > Task :buildSrc:processResources NO-SOURCE remote: > Task :buildSrc:classes UP-TO-DATE remote: > Task :buildSrc:inspectClassesForKotlinIC remote: > Task :buildSrc:jar remote: > Task :buildSrc:assemble remote: > Task :buildSrc:discoverTestScriptsExtensions remote: > Task :buildSrc:compileTestKotlin NO-SOURCE remote: > Task :buildSrc:compileTestJava NO-SOURCE remote: > Task :buildSrc:compileTestGroovy NO-SOURCE remote: > Task :buildSrc:processTestResources NO-SOURCE remote: > Task :buildSrc:testClasses UP-TO-DATE remote: > Task :buildSrc:test NO-SOURCE remote: > Task :buildSrc:check UP-TO-DATE remote: > Task :buildSrc:build remote: > Task :backend:clean UP-TO-DATE remote: > Task :backend:discoverMainScriptsExtensions remote: > Task :common:compileJava NO-SOURCE remote: > Task :common:compileKotlinCommon remote: > Task :common:processResources NO-SOURCE remote: > Task :common:classes remote: > Task :common:inspectClassesForKotlinIC remote: > Task :common:jar remote: > Task :common-jvm:discoverMainScriptsExtensions remote: > Task :common-jvm:compileKotlin
20. remote: > Task :web:runDceKotlinJs remote: > Task :web:compileJava NO-SOURCE remote: > Task :web:classes remote: > Task :web:compileTestKotlin2Js NO-SOURCE remote: > Task :web:runDceTestKotlinJs NO-SOURCE remote: > Task :web:webpack-config remote: > Task :web:webpack-helper SKIPPED remote: > Task :web:webpack-bundle remote: > Task :web:bundle remote: > Task :web:inspectClassesForKotlinIC remote: > Task :web:jar remote: > Task :web:assemble remote: > Task :web:karma-config SKIPPED remote: > Task :web:karma-run-single SKIPPED remote: > Task :web:compileTestJava NO-SOURCE remote: > Task :web:testClasses UP-TO-DATE remote: > Task :web:test NO-SOURCE remote: > Task :web:check UP-TO-DATE remote: > Task :web:build remote: > Task :backend:copyWebBundle remote: > Task :backend:processReleaseResources remote: > Task :backend:releaseClasses remote: > Task :backend:releaseJar remote: > Task :backend:release remote: > Task :stage remote: remote: Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0. remote: Use '!--warning-mode all' to show the individual deprecation warnings. remote: See https:!//docs.gradle.org/4.10.2/userguide/command_line_interface.html#sec:command_line_warnings remote: remote: BUILD SUCCESSFUL in 9m 8s remote: 32 actionable tasks: 31 executed, 1 up-to-date remote: w: Detected multiple Kotlin daemon sessions at build/kotlin/sessions remote: -----> Discovering process types remote: Procfile declares types !-> web remote: -----> Releasing keynotedex (dokku/keynotedex:latest)!!... remote: -----> Deploying keynotedex (dokku/keynotedex:latest)!!... remote: -----> Attempting to run scripts.dokku.predeploy from app.json (if defined) remote: -----> App Procfile file found (/home/dokku/keynotedex/DOKKU_PROCFILE) remote: -----> DOKKU_SCALE file found (/home/dokku/keynotedex/DOKKU_SCALE) remote: =====> web=1 remote: -----> Attempting pre-!flight checks remote: -----> Attempt 1/5 Waiting for 5 seconds !!...
21. $ git push origin master $ git push heroku master
23. $ git push origin master
27. Web
28. override fun HTML.apply() { head { meta { charset = "utf-8" } meta { name = "viewport" content = "width=device-width, initial-scale=1.0" } title { insert(caption) } insert(head) } body { div { id = "content" }
29. override fun HTML.apply() { head { meta { charset = "utf-8" } meta { name = "viewport" content = "width=device-width, initial-scale=1.0, shrink-to-fit=no" } title { +"Keynotedex" } insert(head) link( rel = LinkRel.stylesheet, type = LinkType.textCss, href = "https:!//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" ) { attributes["integrity"] = "sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" attributes["crossorigin"] = "anonymous" } } body { div { id = "content" } script(src = "https:!//code.jquery.com/jquery-3.2.1.slim.min.js") { attributes["integrity"] = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" attributes["crossorigin"] = "anonymous" } script(src = "https:!//cdnjs.cloud!flare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js") { attributes["integrity"] = "sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" attributes["crossorigin"] = "anonymous" } script(src = "https:!//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js") { attributes["integrity"] = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" attributes["crossorigin"] = "anonymous" } script { insert(bundle) } }
30. Kotlin JVM kotlinc
31. https://en.wikipedia.org/wiki/React_(JavaScript_library)
32. KotlinJS kotlinc-js
33. window.onload = { document.getElementById("content") .innerHTML = "Hola" }
34. dynamic
35. val a: dynamic = 3 a.`types?` .I.`haven't`.heard .that.name.`in`.years = ")"
36. https://en.wikipedia.org/wiki/React_(JavaScript_library) +
39. Kotlin Native kotlinc-native
44. Kotlin Multiplatform
45. Multiplatform Modules
46. MyModule
47. jvmMain androidMain iosMain jsMain commonMain MyModule
48. jvmMain androidMain iosMain jsMain commonMain jvmTest androidTest iosTest jsTest commonTest MyModule
49. jvmMain androidMain iosMain jsMain commonMain MyModule
50. jvmMain androidMain iosMain jsMain commonMain
51. expect / actual
52. jvmMain androidMain iosMain jsMain commonMain MyModule
53. Multiplatform libraries
54. @Serializable data class SubmissionResponse( val submission: Submission )
55. httpClient.submitForm<SignInResponse>( path = Paths.signIn, formParameters = parametersOf( "userId" to listOf(userId), "password" to listOf(password) ) )
56. launch { getUserProfile.execute("user1") .fold( { state = Error(it) }, { state = Content(it) } ) }
57. Code sharing
58. Repository Domain Logic Presentation View Binding UI Network
59. Repository Domain Logic Presentation View Binding UI Network
60. Repository Domain Logic Presentation View Binding UI Network
61. The present
62. $ curl \ https:!//keynotedex.wiyarmir.es/api/v1/conferences/ \ -H 'accept: application/json'
66. The future
67. Kotlin 1.3.60 • New Kotlin Native targets • Symbolication of iOS crashes • Performance • New JS plugin improvements • Multithreaded native coroutines preview
68. Multiplatform architecture • Don't just share code, share architectural language • Kotlin Multiplatform an implementation detail
69. Wrapping up
70. Is the tech ready?
72. Judge by yourself
73. https://keynotedex.wiyarmir.es/
74. wiyarmir/keynotedex
75. wiyarmir/kotlin-multiplatform-template
76. Slides: https://speakerdeck.com/wiyarmir/kotlin-beyond-android-2019 Code: github.com/wiyarmir/keynotedex Templates: github.com/wiyarmir/kotlin-multiplatform-template Contact: twitter.com/@wiyarmir