Modularity & Dependency Injection at Scale

How do we break down a large JVM monolith without incurring runtime costs? How do we scale dependency injection in such an application running in a constrained environment like mobile? Does it play well with a modularized Android app? How do you visualize and navigate the graph as complexity grows?

In this session we will describe the mechanisms that we use at Twitter to facilitate modularization and decoupling utilizing dependency injection. We will also cover why Dagger is our tool of choice along with the shortcomings we encountered, and share some practical advice on how to address them. Finally, we’ll offer a sneak peek of the extensions that we built on top of Dagger to facilitate dependency injection that we plan to open source in 2020.

Transcript

1. Modularity & Dependency Injection at Scale FOSS Asia 2020
2. @mrmans0n Nacho López Software Engineer Android Foundation Architecture @CesarDielo César Puerta Technical Lead Twitter for Android @bidyut Saud Khan Software Engineer Android Performance
4. Author: Ben Sandofsky Date: Mon Jun 21 23:24:55 2010 -0700 Initial import.
10. Periscope @PeriscopeCo You might have heard some news: It involves a blue bird. #YouCanGuessTheRest #WeJoinedTheFlockInJanuary 13 Mar 2015 629 761
11. +
14. D D
15. DI is important
16. DI is important Refactoring for… Correctness Testability Reusability
17. regardless of project size DI is important
19. Static checks Errors at compile time > Runtime errors
20. Description: [Dagger/MissingBinding] com.twitter.ui.util.UiArchLayoutContentViewProvider cannot be provided without an @Inject constructor or an @Provides-annotated method. Description: [Dagger/DuplicateBindings] com.twitter.ui.util.UiArchLayoutContentViewProvider is bound multiple times.
21. Code generation Automating the creation of glue code
22. val inflater = LayoutInflater.from(context) val renderer = Renderer(inflater) val database = Database() val timeline = Timeline(database, renderer) class Renderer (database: Database, renderer: Renderer) class Timeline class Database() (inflater: LayoutInflater)
23. class Renderer (database: Database, renderer: Renderer) class Timeline class Database () (inflater: LayoutInflater) @Inject constructor @Inject constructor @Inject constructor
24. Graph Architecture Scoped object graphs mapping to the app lifecycle @Component @Subcomponent
29. @ApplicationScope @UserScope @RetainedScope @ViewScope
30. @Component(modules = [ApplicationModule::class]) @ApplicationScope interface ApplicationObjectGraph { fun userObjectGraphBuilder(): UserObjectGraph.Builder }
31. { fun featureRetainedBuilder(): FeatureRetainedObjectGraph.Builder } @Subcomponent(modules = [UserModule::class]) @UserScope interface UserObjectGraph @Component(modules = [ApplicationModule::class]) @ApplicationScope interface ApplicationObjectGraph { fun userObjectGraphBuilder(): UserObjectGraph.Builder }
32. { fun featureRetainedBuilder(): FeatureRetainedObjectGraph.Builder } @Subcomponent(modules = [UserModule::class]) @UserScope interface UserObjectGraph @ApplicationScope interface ApplicationObjectGraph { fun userObjectGraphBuilder(): UserObjectGraph.Builder } @Subcomponent(modules = [FeatureRetainedModule::class]) @RetainedScope interface FeatureRetainedObjectGraph { fun featureViewGraphBuilder(): FeatureViewObjectGraph.Builder }
33. { fun featureRetainedBuilder(): FeatureRetainedObjectGraph.Builder } @UserScope interface UserObjectGraph @Subcomponent(modules = [FeatureRetainedModule::class]) @RetainedScope interface FeatureRetainedObjectGraph { fun featureViewGraphBuilder(): FeatureViewObjectGraph.Builder } @Subcomponent(modules = [FeatureViewModule::class]) @ViewScope interface FeatureViewObjectGraph
34. { fun featureRetainedBuilder(): FeatureRetainedObjectGraph.Builder } @UserScope interface UserObjectGraph Components or ? Subcomponents @ApplicationScope @UserScope @RetainedScope @ViewScope
35. Components for the root graph for the nested graphs Subcomponents @ApplicationScope @UserScope @RetainedScope @ViewScope
37. How to instantiate your graphs?
38. component = .application(this) .build() class MyApplication : Application { private lateinit var component: ApplicationObjectGraph override fun onCreate() { } super.onCreate() } DaggerApplicationObjectGraph.builder()
39. Dagger.getObjectGraphBuilder<ApplicationObjectGraph>() component = .application(this) .build() class MyApplication : Application { private lateinit var component: ApplicationObjectGraph override fun onCreate() { } super.onCreate() }
40. fun <B : Any> getObjectGraphBuilder(builderClass: Class<B>): B } } class Dagger { companion object { inline fun <reified B : Any> getObjectGraphBuilder(): B = getObjectGraphBuilder(B::class.java) } {
41. if (!builderClass.isAnnotationPresent(Component.Builder::class.java)) { throw IllegalArgumentException("Not a component builder class: $builderClass") } val componentClass = builderClass.enclosingClass ?: throw IllegalStateException("Component builder is not enclosed in a component.") val generatedDaggerClassName = getDaggerComponentImplementationClassName(componentClass) val generatedObjectGraphClass = ReflectionUtils.loadClass<Any>(generatedDaggerClassName) ?: throw IllegalStateException("Generated Dagger class can't be found: $generatedDagge val builderMethod = ReflectionUtils.getMethod(generatedObjectGraphClass, "builder") ?: throw IllegalStateException("The Dagger component generated class does not contain return ReflectionUtils.invokeMethod<B>(builderMethod, null) ?: throw IllegalStateException("The builder() method returned null.") fun <B : Any> getObjectGraphBuilder(builderClass: Class<B>): B } } class Dagger { companion object { inline fun <reified B : Any> getObjectGraphBuilder(): B = getObjectGraphBuilder(B::class.java) } TL;DR Use reflection once to find and instantiate the graph’s Component.Builder {
42. if (!builderClass.isAnnotationPresent(Component.Builder::class.java)) { throw IllegalArgumentException("Not a component builder class: $builderClass") } val componentClass = builderClass.enclosingClass ?: throw IllegalStateException("Component builder is not enclosed in a component.") val generatedDaggerClassName = getDaggerComponentImplementationClassName(componentClass) val generatedObjectGraphClass = ReflectionUtils.loadClass<Any>(generatedDaggerClassName) ?: throw IllegalStateException("Generated Dagger class can't be found: $generatedDagge val builderMethod = ReflectionUtils.getMethod(generatedObjectGraphClass, "builder") ?: throw IllegalStateException("The Dagger component generated class does not contain return ReflectionUtils.invokeMethod<B>(builderMethod, null) ?: throw IllegalStateException("The builder() method returned null.") fun <B : Any> getObjectGraphBuilder(builderClass: Class<B>): B } } class Dagger { companion object { inline fun <reified B : Any> getObjectGraphBuilder(): B = getObjectGraphBuilder(B::class.java) } Don’t worry! We will share the code in GitHub! {
43. if (!builderClass.isAnnotationPresent(Component.Builder::class.java)) { throw IllegalArgumentException("Not a component builder class: $builderClass") } val componentClass = builderClass.enclosingClass ?: throw IllegalStateException("Component builder is not enclosed in a component.") val generatedDaggerClassName = getDaggerComponentImplementationClassName(componentClass) val generatedObjectGraphClass = ReflectionUtils.loadClass<Any>(generatedDaggerClassName) ?: throw IllegalStateException("Generated Dagger class can't be found: $generatedDagge val builderMethod = ReflectionUtils.getMethod(generatedObjectGraphClass, "builder") ?: throw IllegalStateException("The Dagger component generated class does not contain return ReflectionUtils.invokeMethod<B>(builderMethod, null) ?: throw IllegalStateException("The builder() method returned null.") fun <B : Any> getObjectGraphBuilder(builderClass: Class<B>): B } } class Dagger { companion object { inline fun <reified B : Any> getObjectGraphBuilder(): B = getObjectGraphBuilder(B::class.java) } Follow Us! github.com/twitter {
44. Referencing generated code Use reflection once to grab the root object graph builder. Dagger.getObjectGraphBuilder<ApplicationObjectGraph>() DaggerApplicationObjectGraph.builder()
45. Where do we place our graphs?
47. @ApplicationScope @UserScope @RetainedScope @ViewScope
48. Let’s compose a Tweet
49. :features:composer ComposerActivity ComposerViewModel ComposerViewDelegate @RetainedScope @ViewScope @ApplicationScope @UserScope
50. :subsystems:tweets TweetRepository :features:composer @RetainedScope @ViewScope @ApplicationScope @UserScope
51. :subsystems:tweets TweetRepository :features:composer @RetainedScope @ViewScope @ApplicationScope @UserScope
52. :twitter:media ImageUploader :features:composer :subsystems:tweets @RetainedScope @ViewScope @UserScope @ApplicationScope
53. :twitter:media ImageUploader :features:composer :subsystems:tweets @RetainedScope @ViewScope @ApplicationScope @UserScope
54. :core:network OkHttpClient :features:composer :subsystems:tweets :twitter:media @RetainedScope @ViewScope @UserScope @ApplicationScope
55. :core:network :features:composer :subsystems:tweets :twitter:media @RetainedScope @ViewScope @ApplicationScope @UserScope ComposerNotifHandler
56. :core:network :features:composer :subsystems:tweets :twitter:media @RetainedScope @ViewScope @ApplicationScope @UserScope M M M M M M
57. :core:network :features:composer :subsystems:tweets :twitter:media @RetainedScope @ViewScope @ApplicationScope @UserScope M M M M M M
58. App wide graphs definitions belong in the top gradle module. Ideal Location
59. How to access graphs at the top from intermediate layers?
60. :twitter:media L ImageUploader LegacyActivity ApplicationObjectGraph
61. :twitter:media MediaAppSubgraph L LegacyActivity ApplicationObjectGraph
62. object ApplicationObjectGraphProvider { var graphProvider: Any? }
63. component = Dagger.getObjectGraphBuilder<ApplicationObjectGraph>() .application(this) .build() class MyApplication : Application { private lateinit var component: ApplicationObjectGraph override fun onCreate() { } super.onCreate() }
64. super.onCreate() } ApplicationObjectGraphProvider.graphProvider = Dagger.getObjectGraphBuilder<ApplicationObjectGraph>() .application(this) .build() class MyApplication : Application { override fun onCreate() { }
65. ApplicationObjectGraph ApplicationObjectGraphProvider :twitter:media L ImageUploader LegacyActivity MediaAppSubgraph
66. (ApplicationObjectGraphProvider.graphProvider as MediaAppSubgraph).imageUploader()
67. object ApplicationObjectGraphProvider { } fun <T> getSubgraph(clazz: Class<T>): T var graphProvider: Any? { return clazz.cast(graphProvider) }
68. fun imageUploader(): ImageUploader interface MediaAppSubgraph { } companion object { fun get(): MediaAppSubgraph { return ApplicationObjectGraphProvider.graphProvider .getSubgraph(MediaAppSubgraph::class.java) }
69. val uploader = MediaAppSubgraph.get().imageUploader() fun imageUploader(): ImageUploader interface MediaAppSubgraph { } companion object { fun get(): MediaAppSubgraph { return ApplicationObjectGraphProvider.graphProvider .getSubgraph(MediaAppSubgraph::class.java) }
70. val uploader = MediaAppSubgraph.get().imageUploader()
71. Grabbing objects from Dagger w/o visibility Wrap your Application and User graphs in providers that can be statically obtained, and add a way to extract subgraphs from them. ApplicationObjectGraphProvider UserObjectGraphProvider MediaAppSubgraph L LegacyActivity
72. Graphs can be large!
73. fun okHttpClient(): OkHttpClient fun twitterApiService(): TwitterApiService @Component @ApplicationScope interface ApplicationObjectGraph fun composerLauncher(): ComposerLauncher fun composerNotificationHandler(): ComposerNotifHandler fun tweetsRepository(): TweetsRepository fun tweetsDataSource(): TweetsDataSource fun imageLoader(): ImageLoader { fun loginController(): LoginController fun loginAssistController(): LoginAssistController fun appEventTracker(): AppEventTracker fun installationReferrer(): InstallationReferrer fun jobManager(): JobManager fun playServicesUtil(): PlayServicesUtil fun httpRequestController(): HttpRequestController fun registrableHeadsetPlugReceiver(): RegistrableHeadsetPlugReceiver , TweetRepositoryAppModule::cl (modules = [ComposerAppModule::class
74. fun okHttpClient(): OkHttpClient fun twitterApiService(): TwitterApiService @Component @ApplicationScope interface ApplicationObjectGraph fun composerLauncher(): ComposerLauncher fun composerNotificationHandler(): ComposerNotifHandler fun tweetsRepository(): TweetsRepository fun tweetsDataSource(): TweetsDataSource fun imageLoader(): ImageLoader { fun loginController(): LoginController fun loginAssistController(): LoginAssistController fun appEventTracker(): AppEventTracker fun installationReferrer(): InstallationReferrer fun jobManager(): JobManager fun playServicesUtil(): PlayServicesUtil fun httpRequestController(): HttpRequestController fun registrableHeadsetPlugReceiver(): RegistrableHeadsetPlugReceiver , TweetRepositoryAppModule::cl (modules = [ComposerAppModule::class
75. Subgraphs Slices of an Object Graph
76. @Component @ApplicationScope interface ApplicationObjectGraph { } fun okHttpClient(): OkHttpClient fun twitterApiService(): TwitterApiService fun composerLauncher(): ComposerLauncher fun composerNotificationHandler(): ComposerNotifHandler fun tweetsRepository(): TweetsRepository fun tweetsDataSource(): TweetsDataSource fun imageLoader(): ImageLoader :app:twitter
77. : @Component @ApplicationScope interface ApplicationObjectGraph { } fun okHttpClient(): OkHttpClient fun twitterApiService(): TwitterApiService fun composerLauncher(): ComposerLauncher fun composerNotificationHandler(): ComposerNotifHandler fun tweetsRepository(): TweetsRepository fun tweetsDataSource(): TweetsDataSource fun imageLoader(): ImageLoader ComposerAppSubgraph interface ComposerAppSubgraph { } :app:twitter :features:composer
78. @Component @ApplicationScope interface ApplicationObjectGraph , : { } fun okHttpClient(): OkHttpClient fun twitterApiService(): TwitterApiService fun tweetsRepository(): TweetsRepository fun tweetsDataSource(): TweetsDataSource fun imageLoader(): ImageLoader ComposerAppSubgraph interface TweetRepositoryAppSubgraph { } TweetRepositoryAppSubgraph :app:twitter :subsystems:tweets
79. @Component @ApplicationScope interface ApplicationObjectGraph , : { } fun okHttpClient(): OkHttpClient fun twitterApiService(): TwitterApiService fun imageLoader(): ImageLoader ComposerAppSubgraph TweetRepositoryAppSubgraph interface MediaAppSubgraph { } MediaAppSubgraph , :app:twitter :twitter:media
80. @Component @ApplicationScope interface ApplicationObjectGraph , : fun okHttpClient(): OkHttpClient fun twitterApiService(): TwitterApiService ComposerAppSubgraph TweetRepositoryAppSubgraph MediaAppSubgraph , interface CoreNetworkAppSubgraph { } CoreNetworkAppSubgraph , :core:network :app:twitter
81. :core:network :features:composer :subsystems:tweets :twitter:media TweetRepositoryAppSubgraph MediaAppSubgraph CoreNetworkAppSubgraph ApplicationObjectGraph ComposerAppSubgraph
82. :core:network :features:composer :subsystems:tweets :twitter:media TweetRepositoryAppSubgraph MediaAppSubgraph CoreNetworkAppSubgraph ApplicationObjectGraph ComposerAppSubgraph
83. Big monolithic graphs Scatter the definitions of the object graphs into subgraphs that can live in the gradle modules where the bindings are actually defined.
84. How would that work in testing?
85. object ApplicationObjectGraphProvider { } var graphProvider: Any? private val mapping: Map<Class<*>, Any> = mutableMapOf() fun <T> overrideSubgraph(clazz: Class<T>, subgraph: T) { mapping[clazz] = subgraph } fun <T> getSubgraph(clazz: Class<T>): T { if (mapping.containsKey(clazz)) return clazz.cast(mapping[clazz]) return clazz.cast(graphProvider) }
86. object ApplicationObjectGraphProvider { } var graphProvider: Any? private val mapping: Map<Class<*>, Any> = mutableMapOf() fun <T> overrideSubgraph(clazz: Class<T>, subgraph: T) { mapping[clazz] = subgraph } fun <T> getSubgraph(clazz: Class<T>): T { if (mapping.containsKey(clazz)) return clazz.cast(mapping[clazz]) return clazz.cast(graphProvider) }
87. How to decouple features? The app navigation case
88. ComposerActivity MainActivity DMActivity TweetDetailActivity C D M TD
89. ComposerActivity MainActivity DMActivity TweetDetailActivity C D M TD Circular Dependency!
90. ComposerActivity MainActivity TweetDetailActivity C D M TD DMActivity :subsystems:navigation Intent factories ActivityArgs TD C D M
91. ComposerActivity MainActivity TweetDetailActivity C D M TD DMActivity :subsystems:navigation TD M D C ActivityArgs
92. interface ActivityArgs { fun toIntent(context: Context, clazz: Class<out Activity>): Intent }
93. override fun toIntent(context: Context, clazz: Class<out Activity>): { .apply { putExtra("user_id", uid) putExtra("text", text) } } interface ActivityArgs { fun toIntent(context: Context, clazz: Class<out Activity>): Intent } data class ComposerArgs(val uid: Long, val text: String): ActivityArgs { } return Intent(context, clazz)
94. Service Discovery Multibindings
95. C D TD ComposerArgs TweetDetailArgs DMArgs :features:tweetdetail :features:dm :features:composer @Multibinds
96. C D TD ComposerArgs TweetDetailArgs DMArgs :features:tweetdetail :features:dm :features:composer @Multibinds
97. C D TD ComposerArgs TweetDetailArgs DMArgs :features:tweetdetail :features:dm :features:composer Map<Class<out ActivityArgs>, Class<out Activity>> C D TD ComposerActivity DMActivity TweetDetailActivity
98. @Module object ComposerModule { @Provides @ApplicationScope fun provideActivityClass: Class<out Activity> { } } :features:composer @ActivityArgsKey(ComposerArgs::class) @IntoMap return ComposerActivity::class.java
99. @ApplicationScope class ActivityStarter @Inject constructor( ) private val activityMap: Map<Class<out ActivityArgs>, Class<out Activity>>
100. { fun startActivity(context: Context, args: ActivityArgs) { } } @ApplicationScope class ActivityStarter @Inject constructor( ) val intent = args.toIntent(context, activityMap[args.javaClass]) context.startActivity(intent) private val activityMap: Map<Class<out ActivityArgs>, Class<out Activity>>
101. C D TD C D TD Start an Activity we can’t see at compile time At compile time you might not see everything, but at runtime it is all there. Let’s use Multibindings to aggregate references at compile time and resolve them at runtime.
103. Initializers Notification Handlers Deeplink Handlers
105. Subgraphs are not atomic units
106. S ApplicationObjectGraph M S M S M S M S M S M S M S M
107. S ApplicationObjectGraph M S M S M S M S S M S M S M @Component(modules = [ ComposerAppModule::class, TweetDetailAppModule::class, HomeAppModule::class, ExploreAppModule::class, CoreAppModule::class, CoreNetworkAppModule::class, MediaAppModule::class, VideoAppModule::class, NavigationAppModule::class, LoggingAppModule::class, TimelineAppModule::class, … and on and on and on ]) @ApplicationScope interface ApplicationObjectGraph: M
108. ApplicationObjectGraph M M M M M M M M TimelineAppModule::class, … and on and on and on ]) @ApplicationScope interface ApplicationObjectGraph: InitializationSubgraph, ComposerAppSubgraph, TweetDetailAppSubgraph, HomeAppSubgraph, ExploreAppSubgraph, CoreAppSubgraph, CoreNetworkAppSubgraph, MediaAppSubgraph, VideoAppSubgraph, NavigationAppSubgraph, … and on and on and on S S S S S S S S
109. @Component(modules = [ BroadcastAppModule::class, … and on and on and on ]) @ApplicationScope interface ApplicationObjectGraph: InitializationSubgraph, BroadcastAppSubgraph, TweetDetailAppSubgraph, @Component(modules = [ BroadcastAppModule::class, … and on and on and on ]) @ApplicationScope interface ApplicationObjectGraph: InitializationSubgraph, BroadcastAppSubgraph, MapSubgraph, S M
111. { fun broadcastController(): BroadcastController } @Module { @Binds @ApplicationScope fun bindBcastController(impl: BroadcastControllerImpl): BroadcastController } object BroadcastAppModule interface BroadcastAppSubgraph
112. @ApplicationScope interface BroadcastAppSubgraph { fun broadcastController(): BroadcastController } @Subgraph @Subgraph(modules = [BroadcastAppModule::class]) @Module { @Binds @ApplicationScope fun bindBcastController(impl: BroadcastControllerImpl): BroadcastController } object BroadcastAppModule interface BroadcastAppSubgraph
113. @ApplicationScope interface ApplicationObjectGraph : BroadcastAppSubgraph, InitializationSubgraph, ... (modules = [BroadcastAppModule::class, ...]) @Component
114. @ApplicationScope interface ApplicationObjectGraph : BroadcastAppSubgraph, InitializationSubgraph, ... @ObjectGraph
115. @UserScope interface UserObjectGraph : UserManagerSubgraph, TweetRepository, ... (modules = [UserManagerModule::class, ...]) @ApplicationScope interface ApplicationObjectGraph : BroadcastAppSubgraph, InitializationSubgraph, ... @ObjectGraph @Subcomponent
116. @UserScope interface UserObjectGraph : UserManagerSubgraph, TweetRepository, ... @ApplicationScope interface ApplicationObjectGraph : BroadcastAppSubgraph, InitializationSubgraph, ... @ObjectGraph @ObjectGraph
117. Annotation Processor @ObjectGraph @Subgraph @Component @Subcomponent
118. @ObjectGraph @Subgraph Annotation Processor @Component @Subcomponent
119. Annotation Processor @ObjectGraph @Subgraph @Component @Subcomponent
120. Fully Dagger Compatible Annotation Processor
121. Subgraphs are not encapsulated
122. S S S S S S
123. S S S S S S
124. S @ApplicationScope interface BroadcastAppSubgraph { fun broadcastController(): BroadcastController } @Subgraph(modules = [BroadcastAppModule::class])
125. @Subgraph( subgraphDependencies = [ CoreNetworkSubgraph::class, VideoPlayerSubgraph::class ]) S @ApplicationScope interface BroadcastAppSubgraph { fun broadcastController(): BroadcastController } @Subgraph @Subgraph(modules = [BroadcastAppModule::class],
126. S ApplicationObjectGraph S S S S S S S
127. S ApplicationObjectGraph S S S S S S S
128. S ApplicationObjectGraph S S S S S S S S
129. Subgraphs don’t support inversion of dependencies
130. interface DatabaseSubgraph { fun migrationManager(): MigrationManager } fun schema(): Schema @Subgraph
131. interface DatabaseSubgraph { fun migrationManager(): MigrationManager } fun schema(): Schema @Subgraph @Abstract @Abstract @Subgraph interface TwitterDatabaseSubgraph : DatabaseSubgraph { @Binds fun schema(bound: TwitterSchema): Schema }
132. Graphs are hard to maintain
133. @ObjectGraph @ApplicationScope interface ApplicationObjectGraph: InitializationSubgraph, BroadcastAppSubgraph, TweetDetailAppSubgraph, HomeAppSubgraph, ExploreAppSubgraph, CoreAppSubgraph, CoreNetworkAppSubgraph, MediaAppSubgraph, VideoPlayerSubgraph, NavigationAppSubgraph, TweetUploadAppSubgraph, PerformanceMetricsAppSubgraph, DMAppSubgraph, JSONModelsAppSubgraph, DynamicModulesAppSubgraph, NotificationsAppSubgraph, This is actually insane
134. Annotation Processor @ObjectGraph @ApplicationScope interface ApplicationObjectGraph: InitializationSubgraph, BroadcastAppSubgraph, TweetDetailAppSubgraph, HomeAppSubgraph, ExploreAppSubgraph, CoreAppSubgraph, CoreNetworkAppSubgraph, MediaAppSubgraph, VideoPlayerSubgraph, NavigationAppSubgraph, TweetUploadAppSubgraph, PerformanceMetricsAppSubgraph, DMAppSubgraph, JSONModelsAppSubgraph, DynamicModulesAppSubgraph, NotificationsAppSubgraph,
135. @ObjectGraph @ApplicationScope interface ApplicationObjectGraph Annotation Processor Automatic Discovery
136. S ApplicationObjectGraph S S S S S S S
137. And more!
138. Annotation Processor
139. Scythe OOP concepts for DI IDE support Better build times Binding overrides Modular scalability Self documentation Reusability Automatic discovery Completeness validation Factory bindings Assisted Injection Compatible with Dagger
140. Scythe Open-source launch for everybody in 2020
141. @mrmans0n Nacho @CesarDielo César @bidyut Saud Thank you! More questions? Follow ups from this talk? Hit us up on Twitter!