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Dagger Party Tricks @ZacSweers

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Dagger?

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Dagger Party Tricks

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4ish Dagger Party Tricks

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Deferred Initialization

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@Provides fun provideRetrofit(): Retrofit { return Retrofit.Builder() .baseUrl("https://example.com") .build() }a

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@Provides fun provideClient(): OkHttpClient { return OkHttpClient.Builder() .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a

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@Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a

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@Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Retrofit )e

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Retrofit )e

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Retrofit )e

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Retrofit )e

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a 100-150ms! @Inject constructor( retrofit: Retrofit )e

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Lazy!

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a 100-150ms! @Inject constructor( retrofit: Retrofit )e

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Lazy )e 100-150ms!

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Lazy )e 100-150ms! retrofit.get().create(...)

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Lazy )e 100-150ms! retrofit.get().create(...)

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@Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a

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@Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .callFactory(client) .build() }a

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@Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .callFactory(client) .build() }a Call.Factory

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@Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .callFactory(object : Call.Factory by client {}) .build() }a

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@Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .callFactory { client.newCall(it) } .build() }a

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@Provides fun provideRetrofit(client: Lazy): Retrofit { return Retrofit.Builder() .callFactory { client.get().newCall(it) } .build() }a

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@Provides fun provideRetrofit(client: Lazy): Retrofit { return Retrofit.Builder() .callFactory { client.get().newCall(it) } .build() }a

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Lazy )e 100-150ms! retrofit.get().create(...)

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit(client: OkHttpClient): Retrofit { return Retrofit.Builder() .client(client) .build() }a @Inject constructor( retrofit: Lazy )e 100-150ms! retrofit.get().create(...) Main thread!

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit( client: Lazy): Retrofit { return Retrofit.Builder() .callFactory { client.get().newCall(it) } .build() }a @Inject constructor( retrofit: Retrofit )e 100-150ms! Background thread

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Courtesy of Nick Butcher (@crafty) @Provides fun provideCache(ctx: Context): Cache { checkMainThread() return Cache(ctx.cacheDir, CACHE_SIZE) }c @Provides fun provideClient(cache: Cache): OkHttpClient { checkMainThread() return OkHttpClient.Builder() .cache(cache) .build() }b @Provides fun provideRetrofit( client: Lazy): Retrofit { return Retrofit.Builder() .callFactory { client.get().newCall(it) } .build() }a @Inject constructor( retrofit: Retrofit )e 100-150ms! Background thread

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Modularizing

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@Module class MyGiantModule { @Provides fun provideSeasoning() = Seasoning() @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }a

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@Module class MyGiantModuleBase { @Provides fun provideSeasoning() = Seasoning() }a @Module(includes = MyGiantModuleBase::class) class MyGiantModule { @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }b

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@Module(includes = MyGiantModuleBase::class) class MyGiantModule { @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }b @Module class MyGiantModuleBase { @Provides fun provideSeasoning() = Seasoning() }a

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@Module class MyGiantModule { @Provides fun provideSeasoning() = Seasoning() @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }a

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@Module class SeasoningModule { @Provides fun provideSeasoning() = Seasoning() }b @Module(includes = SeasoningModule::class) class MyGiantModule { @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }a

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@Module class SeasoningModule { @Provides fun provideSeasoning() = Seasoning() }b @Module(includes = [SeasoningModule::class, TacoModule::class]) class MyGiantModule @Module class TacoModule { @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }c

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@Module class SeasoningModule { @Provides fun provideSeasoning() = Seasoning() }b @Module(includes = TacoModule::class) class MyGiantModule @Module(includes = SeasoningModule::class) class TacoModule { @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }c

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@Module class SeasoningModule { @Provides fun provideSeasoning() = Seasoning() }b @Module(includes = SeasoningModule::class) class TacoModule { @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }c

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class Seasoning @Inject constructor() class Taco @Inject constructor(seasoning: Seasoning)

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class Taco @Inject constructor(seasoning: Seasoning) Food subproject Feature A

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class Taco @Inject constructor(seasoning: Seasoning) Food subproject Feature A class Taco_Factory

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class Taco @Inject constructor(seasoning: Seasoning) Food subproject Feature A class Taco_Factory Feature B class Taco_Factory

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class Taco @Inject constructor(seasoning: Seasoning) Food subproject Feature A class Taco_Factory Feature B class Taco_Factory App

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class Taco @Inject constructor(seasoning: Seasoning) Food subproject Feature A class Taco_Factory Feature B class Taco_Factory App

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class Taco @Inject constructor(seasoning: Seasoning) Food subproject Feature A class Taco_Factory Feature B App

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Internal APIs

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@Module class FoodModule { @Provides fun provideSeasoning() = Seasoning() @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }

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@Qualifier annotation class InternalApi

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@Qualifier private annotation class InternalApi

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@Qualifier private annotation class InternalApi @Module class FoodModule { @Provides fun provideSeasoning() = Seasoning() @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }a

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@Qualifier private annotation class InternalApi @Module class FoodModule { @InternalApi @Provides fun provideSeasoning() = Seasoning() @Provides fun provideTaco(@InternalApi seasoning: Seasoning) = Taco(seasoning) }a

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Multibindings

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Multibindings • Set - @IntoSet, @ElementsIntoSet • Map - @IntoMap, @MapKey, etc

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@Module class FoodModule { @Provides fun provideSeasoning() = Seasoning() @Provides fun provideTaco(seasoning: Seasoning) = Taco(seasoning) }a

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@Module class FoodModule { @Provides fun provideSpicy() = SpicySeasoning() @Provides fun provideElPaso() = ElPasoSeasoning() @Provides fun provideTaco( spicy: SpicySeasoning, elpaso: ElPasoSeasoning ) = Taco(setOf(spicy, elpaso)) }a

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@Module abstract class FoodModule { @Multibinds abstract fun seasonings(): Set @Provides fun provideSpicy() = SpicySeasoning() @Provides fun provideElPaso() = ElPasoSeasoning() @Provides fun provideTaco( spicy: SpicySeasoning, elpaso: ElPasoSeasoning ) = Taco(setOf(spicy, elpaso)) }a

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@Module abstract class FoodModule { @Multibinds abstract fun seasonings(): Set @Provides @IntoSet fun provideSpicy() = SpicySeasoning() @Provides @IntoSet fun provideElPaso() = ElPasoSeasoning() @Provides fun provideTaco(seasonings: Set) = Taco(seasonings) }a

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@Module(includes = SeasoningModule::class) abstract class FoodModule { @Multibinds abstract fun seasonings(): Set @Provides fun provideTaco(seasonings: Set) = Taco(seasonings) }a @Module class SeasoningModule { @Provides @IntoSet fun provideSpicy() = SpicySeasoning() @Provides @IntoSet fun provideElPaso() = ElPasoSeasoning() }

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@Module abstract class FoodModule { @Multibinds abstract fun seasonings(): Set @Provides fun provideTaco(seasonings: Set) = Taco(seasonings) }a

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@Module abstract class NetworkModule { @Multibinds abstract fun interceptors(): Set @Provides fun provideOkHttp(interceptors: Set) = // ... }a

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@Module abstract class DataModule { @Multibinds abstract fun adapters(): Set @Provides fun provideMoshi(adapters: Set) = // ... }a

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@Module abstract class LoggingModule { @Multibinds abstract fun trees(): Set }a

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@Module abstract class PetsScreenModule { @Multibinds abstract fun categories(): Set }a

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@Module abstract class PetsScreenModule { @Multibinds abstract fun categories(): Map }a

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@Module abstract class PetsScreenModule { @Multibinds abstract fun categories(): Map> }a

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@Module abstract class PetsScreenModule { @Multibinds abstract fun categories(): Map> }a

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data class ScreenKey( val id: String )a

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data class ScreenKey( val id: String, val xpId: String )a

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data class ScreenKey( val id: String, val xpId: String )a class ScreenPresenter @Inject constructor( screens: Map>, private val xpManager: XpManager ) { private val finalScreens = screens.filterKeys { xpManager.isEnabled(it.xpId) } }

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Dagger Party Tricks • github.com/ZacSweers/CatchUp • github.com/JakeWharton/sdksearch • github.com/JakeWharton/u2020 • Dagger Powered Plugin System post: https:// bit.ly/2T2Yqkl • Dependency Injection in a multi module project: https://bit.ly/2Gz5YFR @ZacSweers