Dagger Hilt로 의존성 주입하기

2023년 7월 29일 (토) I/O Extended 2023 Seoul 행사에서의 발표자료입니다.
https://festa.io/events/3683

Transcript

1. Dagger Hilt۽
   
   ੄ઓࢿ ઱ੑೞӝ
   Android
   

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2. Sungyong An
   
   NAVER WEBTOON
   
   Android GDE
   
   @fornewid
   

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3. Intro
   “৵ ૑Ә Dagger Hiltܳ…?”
   
   “Dagger Hiltী ࢜۽਍ ߸҃ࢎ೦੉ ੓աਃ?”
   
   “׮ܲ ੄ઓࢿ ઱ੑ ۄ੉࠳۞ܻ৬ ࠺Үೞח ղਊੋоਃ?”
   🤔
   

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4. Intro
   “৵ ૑Ә Dagger Hiltܳ…?”
   
   “Dagger Hiltী ࢜۽਍ ߸҃ࢎ೦੉ ੓աਃ?”
   
   “׮ܲ ੄ઓࢿ ઱ੑ ۄ੉࠳۞ܻ৬ ࠺Үೞח ղਊੋоਃ?”
   🤔
   

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5. Intro
   ੄ઓࢿ ઱ੑ(DI)਷ ೞա੄ ё୓о ׮ܲ ё୓੄ ੄ઓࢿਸ ઁҕೞח ӝߨ੉׮.
   
   ੄ઓࢿ ઱ੑ੄ ੄بח ё୓੄ ࢤࢿҗ ࢎਊ੄ ҙबਸ ܻ࠙ೞח Ѫ੉׮.
   Dependency Injection?
   Link: https://en.wikipedia.org/wiki/Dependency_injection
   

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6. // Without Dependency Injection
   
   
   class Car {
   
   
   private val engine: Engine = Engine()
   
   
   fun start() {
   
   
   engine.start()
   
   
   }
   
   
   }
   
   
   fun main(args: Array) {
   
   
   val car = Car()
   
   
   car.start()
   
   
   }
   ੄ઓࢿ ઱ੑ হ੉, Car ௿ېझ ղࠗীࢲ Engineਸ ࢤࢿೞח ௏٘ੑפ׮.
   

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7. // Dependency Injection (Constructor Injection)
   
   
   class Car(
   
   
   private val engine: Engine
   
   
   ) {
   
   
   fun start() {
   
   
   engine.start()
   
   
   }
   
   
   }
   
   
   fun main(args: Array) {
   
   
   val engine = Engine()
   
   
   val car = Car(engine)
   
   
   car.start()
   
   
   }
   ੄ઓࢿ ઱ੑীࢲח Car ௿ېझ ࢤࢿ੗ী Engineਸ ੹׳ೞѢա,
   

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8. // Dependency Injection (Field Injection)
   
   
   class Car {
   
   
   lateinit var engine: Engine
   
   
   fun start() {
   
   
   engine.start()
   
   
   }
   
   
   }
   
   
   fun main(args: Array) {
   
   
   val car = Car()
   
   
   car.engine = Engine()
   
   
   car.start()
   
   
   }
   ৻ࠗীࢲ Engineਸ ࢤࢿೞৈ ೙٘ ઱ੑਵ۽ ੹׳೤פ׮.
   

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9. Intro
   DI੄ ਗ஗ਸ ٮܰݶ ഴܯೠ জ ইఃఫ୊ܳ ਤೠ ష؀ܳ ݃۲ೡ ࣻ ੓׮.
   
   • ௏٘ ੤ࢎਊ оמ
   
   • ܻಂష݂ ಞ੄ࢿ
   
   • పझ౟ ಞ੄ࢿ
   Dependency Injection ੉੼?
   Link: https://en.wikipedia.org/wiki/Dependency_injection
   

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10. Intro
    Android ߂ Java ਊ ੄ઓࢿ ઱ੑ ೐ۨ੐ਕ௼.
    
    ஹ౵ੌ ఋ੐ী ࣗझ௏٘ ࢤࢿ.
    
    Dependency Injection ಁఢ.
    
    https://github.com/google/dagger
    Dagger ӝ߈ Android ੄ઓࢿ ઱ੑ ೐ۨ੐ਕ௼.
    
    ؀ࠗ࠙੄ Dagger ࢚ਊҳ ઁѢ.
    
    Dependency Injection ಁఢ.
    
    https://github.com/google/dagger
    Dagger Hilt (Recommended)
    Dagger੄ ੄ઓࢿ ઱ੑਸ ؊ औѱ ݅٘ח
    
    Kotlin ஹ౵ੌ۞ ೒۞Ӓੋ.
    
    Dependency Injection ಁఢ.
    
    https://github.com/square/anvil
    Anvil
    Kotlin ҃۝ ੄ઓࢿ ઱ੑ ೐ۨ੐ਕ௼.
    
    ۠ఋ੐ী ੄ઓࢿ Ӓې೐ ҳࢿ.
    
    Service Locator ಁఢ.
    
    https://github.com/InsertKoinIO/koin
    Kotlin ਊ ੄ઓࢿ ઱ੑ ۄ੉࠳۞ܻ.
    
    ஹ౵ੌ ఋ੐ী ੄ઓࢿ Ӓې೐ ਬബࢿ Ѩࢎ.
    
    KSP, Kotlin Multiplatform ૑ਗ.
    
    https://github.com/evant/kotlin-inject
    Koin kotlin-inject
    ࢶఖೠ ੉ਬ? ૑ࣘоמࢿ
    …
    

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11. Intro
    • ё୓ܳ ࢤࢿೞח Ҕҗ ࢎਊೞח Ҕ੉ ܻ࠙غয, ௏٘ܳ ୶੸ೞӝ য۵ѱ ݅ٚ׮.
    
    • ✅ Android Studioח Dagger ߂ Hilt ҙ۲ ௏٘ р੄ ఐ࢝ਸ ૑ਗೠ׮.
    
    https://medium.com/androiddevelopers/dagger-navigation-support-in-android-studio-49aa5d149ec9
    
    • ௏٘о ࠗ࠙ࠗ࠙ ܻ࠙غয, दझమ ੹୓о ࣻ೯ೞח ੘সਸ ౵ঈೞӝ য۵׮.
    
    • ࢎਊೞח ౠ੿ DI ೐ۨ੐ਕ௼ী ੄ઓೞѱ ػ׮.
    Dependency Injection == ?
    Link: https://en.wikipedia.org/wiki/Dependency_injection
    💯
    

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12. Intro
    Java, Kotlin MVC, MVP, MVVM, MVI
    Language Architecture
    Java Threads, AsyncTask, HandlerThread,
    
    Guava, RxJava, Kotlin Coroutines
    Asynchronous work
    View, Layout XML, anko, Litho, Compose,
    
    ButterKnife, Kotlin Android Extensions,
    
    DataBinding, ViewBinding
    Android Universal Image Loader, Picasso,
    
    Glide, Coil, Volley, OkHttp, Retrofit, Ktor,
    
    Jackson, Gson, Moshi, kotlinx.serialization
    User Interface Network Background work
    Service, AlarmManager, JobScheduler,
    
    GCMNetworkManager, android-job,
    
    JobDispatcher, JobService, WorkManager
    

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13. Intro
    Java, Kotlin MVC, MVP, MVVM, MVI
    Language Architecture
    Java Threads, AsyncTask, HandlerThread,
    
    Guava, RxJava, Kotlin Coroutines
    Asynchronous work
    View, Layout XML, anko, Litho, Compose,
    
    ButterKnife, Kotlin Android Extensions,
    
    DataBinding, ViewBinding
    Android Universal Image Loader, Picasso,
    
    Glide, Coil, Volley, OkHttp, Retrofit, Ktor,
    
    Jackson, Gson, Moshi, kotlinx.serialization
    User Interface Network Background work
    Service, AlarmManager, JobScheduler,
    
    GCMNetworkManager, android-job,
    
    JobDispatcher, JobService, WorkManager
    Nothing Lasts Forever
    

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14. “Hiltܳ ੉ਊೞৈ Android জী ੄ઓࢿ ઱ੑ ಁఢਸ ҳഅೞغ,
    
    ݾ੸ਸ ஂೡ ݅ఀ݅ ੸׼൤ ࢎਊೞח ߑߨਸ Ҋ޹೧ ࠁ੗.”
    ݾ಴
    

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15. Hiltо ઁҕೞח জী ੄ઓࢿ ઱ੑೞח ߑߨਸ ঌইࠄ׮.
    
    Jetpack ۄ੉࠳۞ܻ৬ োزغח ࠗ࠙ب рױ൤ ࢓ಝࠄ׮.
    ݾ੸ী ݏѱ, জীࢲ Hiltܳ ࢎਊೞח ഋకܳ Ҋ޹೧ ࠄ׮.
    
    ӝࠄ о੉٘ࠁ׮ ؊ ࠂ੟ೞѱ ࢎਊೞח Ѫ੉ ա਷ ࠗ࠙җ
    
    য়൤۰ ࢎਊೞ૑ ঋח Ѫ੉ ա਷ ࠗ࠙ ١ਸ ࢤп೧ ࠄ׮.
    Dagger Hilt Thinking Usages
    ݾର
    

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16. Dependency Injection
    
    with Dagger Hilt
    Section #1
    Dagger Hiltܳ ੉ਊೞৈ ੄ઓࢿ ઱ੑೞӝ
    

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17. // build.gradle
    
    
    buildscript {
    
    
    repositories {
    
    
    mavenCentral()
    
    
    }
    
    
    dependencies {
    
    
    classpath 'com.google.dagger:hilt-android-gradle-plugin:2.47'
    
    
    }
    
    
    }
    
    
    // app/build.gradle
    
    
    apply plugin: 'com.google.dagger.hilt.android'
    
    
    apply plugin: 'kotlin-kapt'
    
    
    dependencies {
    
    
    implementation 'com.google.dagger:hilt-android:2.47'
    
    
    kapt 'com.google.dagger:hilt-compiler:2.47'
    
    
    }
    Link: https://dagger.dev/hilt/gradle-setup
    Gradle Setup
    

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18. Section #1
    ӝࠄ੸ੋ Dagger Hilt ࢎਊߑߨਸ ࢓ಝࠁ੗.
    
    • @HiltAndroidApp, @AndroidEntryPoint, @EntryPoint
    
    • Components
    
    • SingletonComponent, ViewModelComponent, ActivityComponent, ...
    
    • Scopes
    
    • @Singleton, @ViewModelScoped, @ActivityScoped, …
    
    • Modules
    
    • @Inject, @Module, @Provides, @Binds, @Qualifier, @Lazy, …
    Hilt Basics
    Link: https://dagger.dev/hilt/quick-start
    

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19. @HiltAndroidApp
    
    
    class ExampleApplication : Application() {
    
    
    @Inject lateinit var bar: Bar
    
    
    override fun onCreate() {
    
    
    super.onCreate()
    
    
    // Use bar
    
    
    }
    
    
    }
    (1) Hiltܳ ࢎਊೞח ݽٚ জ਷ Applicationী HiltAndroidAppਸ ୶о೧ঠ ೤פ׮.
    

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20. class ExampleApplication : Hilt_ExampleApplication()
    
    
    public abstract class Hilt_ExampleApplication extends Application implements ... {
    
    
    @CallSuper
    
    
    @Override
    
    
    public void onCreate() {
    
    
    hiltInternalInject();
    
    
    super.onCreate();
    
    
    }
    
    
    ...
    
    
    }
    Generated
    Gradle ೒۞Ӓੋਸ ੉ਊೞݶ ࢚ࣘਸ ా೧
    

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21. public final class ExampleApplication_MembersInjector
    
    
    implements MembersInjector {
    
    
    private final Provider barProvider;
    
    
    public ExampleApplication_MembersInjector(Provider barProvider) {
    
    
    this.barProvider = barProvider;
    
    
    }
    
    
    @Override
    
    
    public void injectMembers(ExampleApplication instance) {
    
    
    injectBar(instance, barProvider.get());
    
    
    }
    
    
    public static void injectBar(ExampleApplication instance, Bar bar) {
    
    
    instance.bar = bar;
    
    
    }
    
    
    }
    Generated
    ੄ઓࢿب ઱ੑೡ ࣻ ੓णפ׮.
    

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22. @AndroidEntryPoint
    
    
    class ExampleActivity : Activity() {
    
    
    @Inject lateinit var bar: Bar
    
    
    override fun onCreate() {
    
    
    super.onCreate()
    
    
    // Use bar
    
    
    }
    
    
    }
    (2) Activityח AndroidEntryPointܳ ੉ਊೞৈ, Field Injection੉ оמ೤פ׮.
    

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23. class ExampleActivity : Hilt_ExampleActivity()
    
    
    public abstract class Hilt_ExampleActivity extends Activity implements ... {
    
    
    Hilt_ExampleActivity() {
    
    
    super();
    
    
    _initHiltInternal();
    
    
    }
    
    
    private void _initHiltInternal() {
    
    
    addOnContextAvailableListener(new OnContextAvailableListener() {
    
    
    @Override
    
    
    public void onContextAvailable(Context context) {
    
    
    inject();
    
    
    }
    
    
    });
    
    
    }
    
    
    }
    Generated
    ݃ଲо૑۽ ࢚ࣘਸ ా೧, ੄ઓࢿਸ ઱ੑ೤פ׮.
    

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24. @AndroidEntryPoint
    
    
    class ExampleFragment : Fragment() { ... }
    
    
    @AndroidEntryPoint
    
    
    class ExampleView @JvmOverloads constructor(
    
    
    context: Context,
    
    
    attrs: AttributeSet? = null,
    
    
    defStyleAttr: Int = 0,
    
    
    ) : View(context, attrs, defStyleAttr) { ... }
    
    
    @AndroidEntryPoint
    
    
    class ExampleService : Service() { ... }
    
    
    @AndroidEntryPoint
    
    
    class ExampleBroadcastReceiver : BroadcastReceiver() { ... }
    Fragment, View, Service, BroadcastReceiverب زੌ೤פ׮.
    

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25. public abstract class Hilt_ExampleFragment extends Fragment
    
    
    class ExampleFragment : Hilt_ExampleFragment() { ... }
    
    
    public abstract class Hilt_ExampleView extends View
    
    
    class ExampleView @JvmOverloads constructor(
    
    
    context: Context,
    
    
    attrs: AttributeSet? = null,
    
    
    defStyleAttr: Int = 0,
    
    
    ) : Hilt_ExampleView(context, attrs, defStyleAttr) { ... }
    
    
    public abstract class Hilt_ExampleService extends Service
    
    
    class ExampleService : Hilt_ExampleService() { ... }
    
    
    public abstract class Hilt_ExampleBroadcastReceiver extends BroadcastReceiver
    
    
    class ExampleBroadcastReceiver : Hilt_ExampleBroadcastReceiver() { ... }
    Generated
    ݃ଲо૑۽ ࢚ࣘਸ ా೧, ੄ઓࢿਸ ઱ੑ೤פ׮.
    

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26. class ExampleContentProvider : ContentProvider() {
    
    
    @EntryPoint
    
    
    @InstallIn(SingletonComponent::class)
    
    
    interface ExampleContentProviderEntryPoint {
    
    
    fun bar(): Bar
    
    
    }
    
    
    override fun query(...): Cursor {
    
    
    val appContext = context?.applicationContext ?: throw IllegalStateException()
    
    
    val hiltEntryPoint = EntryPointAccessors.fromApplication(
    
    
    appContext,
    
    
    ExampleContentProviderEntryPoint::class.java
    
    
    )
    
    
    val bar = hiltEntryPoint.bar()
    
    
    ...
    
    
    }
    
    
    }
    (3) ContentProviderח EntryPointܳ ੉ਊೞৈ, ੄ઓࢿਸ ઱ੑೡ ࣻ ੓णפ׮.
    

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27. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object ExampleModule {
    
    
    @Provides
    
    
    fun providesBar(foo: Foo): Bar = Bar(foo)
    
    
    @Provides
    
    
    fun providesFoo(): Foo = Foo()
    
    
    }
    (4) ઱ੑ೧ঠ ೡ ੄ઓࢿਸ Moduleী ੿੄ೡ ࣻ ੓णפ׮.
    

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28. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object ExampleModule {
    
    
    @Provides
    
    
    fun providesBar(foo: Foo): Bar = Bar(foo)
    
    
    @Provides
    
    
    fun providesFoo(): Foo = Foo()
    
    
    }
    (5) InstallInਸ ੉ਊೞৈ, Moduleਸ ࢸ஖ೞ۰ח Componentܳ ੿੄೤פ׮.
    

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29. Section #1
    ׮নೠ উ٘۽੉٘ ҳࢿਃࣗ੄
    
    ࣻݺ ઱ӝী ੗زਵ۽ ా೤غח
    
    ӝࠄ ઁҕ Componentо ੓णפ׮.
    
    п ҳࢿ ਃࣗ੄ ࣻݺী ؀ೠ
    
    ߄ੋ٬ ߧਤܳ ૑੿ೞחؘ ࢎਊغח
    
    Scope Annotation੉ ੓णפ׮.
    Component
    Link: https://dagger.dev/hilt/components
    

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30. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object ExampleModule {
    
    
    @Provides
    
    
    fun providesBar(foo: Foo): Bar = Bar(foo)
    
    
    @Provides
    
    
    fun providesFoo(): Foo = Foo()
    
    
    }
    Foo
    Bar
    (6) Providesܳ ੉ਊೞৈ, ੄ઓࢿਸ ઁҕೡ ࣻ ੓णפ׮.
    

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31. public final class ExampleModule_ProvidesFooFactory implements Factory {
    
    
    @Override
    
    
    public Foo get() {
    
    
    return providesFoo();
    
    
    }
    
    
    public static ExampleModule_ProvidesFooFactory create() {
    
    
    return InstanceHolder.INSTANCE;
    
    
    }
    
    
    public static Foo providesFoo() {
    
    
    return Preconditions.checkNotNullFromProvides(ExampleModule.INSTANCE.providesFoo());
    
    
    }
    
    
    private static final class InstanceHolder {
    
    
    private static final ExampleModule_ProvidesFooFactory INSTANCE =
    
    
    new ExampleModule_ProvidesFooFactory();
    
    
    }
    
    
    }
    Generated
    пп੄ @Provides ೣࣻ݃׮ Factory ௿ېझо ੗ز ࢤࢿؾפ׮.
    

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32. public final class ExampleModule_ProvidesBarFactory implements Factory {
    
    
    private final Provider fooProvider;
    
    
    public ExampleModule_ProvidesBarFactory(Provider fooProvider) {
    
    
    this.fooProvider = fooProvider;
    
    
    }
    
    
    @Override
    
    
    public Bar get() {
    
    
    return providesBar(fooProvider.get());
    
    
    }
    
    
    public static ExampleModule_ProvidesBarFactory create(Provider fooProvider) {
    
    
    return new ExampleModule_ProvidesBarFactory(fooProvider);
    
    
    }
    
    
    public static Bar providesBar(Foo foo) {
    
    
    return Preconditions.checkNotNullFromProvides(ExampleModule.INSTANCE.providesBar(foo));
    
    
    }
    
    
    }
    Generated
    

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33. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object ExampleModule {
    
    
    @Provides
    
    
    fun providesBar(foo: Foo): Bar = BarImpl(foo)
    
    
    @Provides
    
    
    fun providesFoo(): Foo = FooImpl()
    
    
    }
    Foo
    Bar
    FooImpl
    BarImpl
    (7) ੋఠಕ੉झ৬ ҳഅ୓ܳ ܻ࠙ೡ ࣻب ੓णפ׮.
    

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34. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object ExampleModule {
    
    
    // unscoped
    
    
    @Provides
    
    
    fun providesBar(foo: Foo): Bar = BarImpl(foo)
    
    
    @Singleton
    
    
    @Provides
    
    
    fun providesFoo(): Foo = FooImpl()
    
    
    }
    (8) Scopeܳ ૑੿ೞݶ, ೧׼ Component੄ ࣻݺ੉ ՘զ ٸө૑ ਬ૑ؾפ׮.
    

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35. private static final class SingletonCImpl extends ... {
    
    
    private Provider providesFooProvider;
    
    
    private SingletonCImpl() {
    
    
    this.providesFooProvider = DoubleCheck.provider(
    
    
    () -> ExampleModule_ProvidesFooFactory.providesFoo()
    
    
    );
    
    
    }
    
    
    public Bar providesBar() {
    
    
    return ExampleModule_ProvidesBarFactory
    
    
    .providesBar((Foo)this.providesFooProvider.get())
    
    
    .bar();
    
    
    }
    
    
    }
    Generated
    Scopeо ૑੿غ૑ ঋਵݶ, ݒߣ ࢤࢿ೤פ׮.
    

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36. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    interface ExampleModule {
    
    
    @Binds
    
    
    fun bindsBar(impl: BarImpl): Bar
    
    
    @Singleton
    
    
    @Binds
    
    
    fun bindsFoo(impl: FooImpl): Foo
    
    
    }
    Foo
    Bar
    FooImpl
    BarImpl
    (9) Inject৬ Bindsܳ ੉ਊೞৈ, ҳഅ୓ܳ ੋఠಕ੉झ ഋక۽ ઁҕೡ ࣻب ੓णפ׮.
    class BarImpl @Inject constructor(private val foo: Foo) : Bar { ... }
    
    
    class FooImpl @Inject constructor() : Foo { ... }
    

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37. private static final class SingletonCImpl extends ... {
    
    
    private Provider fooImplProvider;
    
    
    private Provider bindsFooProvider;
    
    
    private SingletonCImpl() {
    
    
    this.fooImplProvider = () -> new FooImpl();
    
    
    this.bindsFooProvider = DoubleCheck.provider(this.fooImplProvider);
    
    
    }
    
    
    public Bar providesBar() {
    
    
    return new BarImpl((Foo) this.bindsFooProvider.get());
    
    
    }
    
    
    }
    Generated
    Provides৬ ׮ܰѱ, Bindsח Factory ௿ېझо ࢤࢿغ૑ ঋणפ׮.
    

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38. Section #1
    Dagger Hilt۽ ViewModelী ੄ઓࢿਸ ઱ੑೡ ࣻ ੓णפ׮.
    Dagger Hilt۽ Workerী ੄ઓࢿਸ ઱ੑೡ ࣻ ੓णפ׮.
    ViewModel WorkManager
    With Jetpack Libraries
    

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39. @HiltViewModel
    
    
    class ExampleViewModel @Inject constructor(
    
    
    private val savedStateHandle: SavedStateHandle,
    
    
    private val repository: ExampleRepository
    
    
    ) : ViewModel() {
    
    
    ...
    
    
    }
    
    
    @AndroidEntryPoint
    
    
    class ExampleActivity : Activity() {
    
    
    private val exampleViewModel: ExampleViewModel by viewModels()
    
    
    ...
    
    
    }
    ViewModel
    Activityীࢲ ੄ઓࢿ ઱ੑػ ViewModelী ੽Ӕೞח ௏٘ੑפ׮.
    
    ViewModel਷ AndroidEntryPoint ؀न, HiltViewModelܳ ࢎਊೞৈ ੄ઓࢿਸ ઱ੑ೤פ׮.
    

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40. public abstract class Hilt_ExampleActivity extends Activity implements ... {
    
    
    ...
    
    
    @Override
    
    
    public ViewModelProvider.Factory getDefaultViewModelProviderFactory() {
    
    
    return DefaultViewModelFactories
    
    
    .getActivityFactory(this, super.getDefaultViewModelProviderFactory());
    
    
    }
    
    
    }
    Generated
    Activity੄ Factoryܳ Hilt੄ ҳഅ଻۽ overrideೞח ߑधੑפ׮.
    

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41. public final class DefaultViewModelFactories {
    
    
    public static ViewModelProvider.Factory getActivityFactory(
    
    
    ComponentActivity activity, ViewModelProvider.Factory delegateFactory) {
    
    
    return EntryPoints.get(activity, ActivityEntryPoint.class)
    
    
    .getHiltInternalFactoryFactory()
    
    
    .fromActivity(activity, delegateFactory);
    
    
    }
    
    
    @EntryPoint
    
    
    @InstallIn(ActivityComponent.class)
    
    
    public interface ActivityEntryPoint {
    
    
    InternalFactoryFactory getHiltInternalFactoryFactory();
    
    
    }
    
    
    ...
    Library Internal
    ղࠗ੸ਵ۽ EntryPointܳ ࢎਊ೤פ׮.
    

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42. @HiltViewModel
    
    
    class ExampleViewModel @Inject constructor(
    
    
    private val savedStateHandle: SavedStateHandle,
    
    
    private val repository: ExampleRepository
    
    
    ) : ViewModel() {
    
    
    ...
    
    
    }
    
    
    import androidx.lifecycle.viewmodel.compose.viewModel
    
    
    @Composable
    
    
    fun MyScreen(
    
    
    viewModel: MyViewModel = viewModel()
    
    
    ) {
    
    
    ...
    
    
    }
    Composeীࢲ ੄ઓࢿ ઱ੑػ ViewModelী ੽Ӕೞח ௏٘ੑפ׮.
    

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43. package androidx.lifecycle.viewmodel.compose
    
    
    @Composable
    
    
    public inline fun viewModel(
    
    
    viewModelStoreOwner: ViewModelStoreOwner = checkNotNull(LocalViewModelStoreOwner.current) {
    
    
    "No ViewModelStoreOwner was provided via LocalViewModelStoreOwner"
    
    
    },
    
    
    key: String? = null,
    
    
    factory: ViewModelProvider.Factory? = null,
    
    
    extras: CreationExtras = if (viewModelStoreOwner is HasDefaultViewModelProviderFactory) {
    
    
    viewModelStoreOwner.defaultViewModelCreationExtras
    
    
    } else {
    
    
    CreationExtras.Empty
    
    
    }
    
    
    ): VM = viewModelStoreOwner.get(VM::class.java, key, factory, extras)
    Library Internal
    CompositionLocalਸ ੉ਊೞח ߑधੑפ׮.
    

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44. package androidx.lifecycle.viewmodel.compose
    
    
    public object LocalViewModelStoreOwner {
    
    
    private val LocalViewModelStoreOwner =
    
    
    compositionLocalOf { null }
    
    
    public val current: ViewModelStoreOwner?
    
    
    @Composable
    
    
    get() = LocalViewModelStoreOwner.current
    
    
    ?: LocalView.current.findViewTreeViewModelStoreOwner()
    
    
    }
    Library Internal
    LocalViewܳ ా೧, ViewModelStoreOwnerী ੽Ӕ೤פ׮.
    

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45. package androidx.activity;
    
    
    public class ComponentActivity
    
    
    extends androidx.core.app.ComponentActivity
    
    
    implements ViewModelStoreOwner {
    
    
    private void initViewTreeOwners() {
    
    
    ...
    
    
    ViewTreeViewModelStoreOwner.set(getWindow().getDecorView(), this);
    
    
    ...
    
    
    }
    
    
    }
    Library Internal
    ѾҴ ViewModelStoreOwnerܳ ੉ਊೞৈ,
    

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46. private fun ViewModelStoreOwner.get(
    
    
    javaClass: Class,
    
    
    key: String? = null,
    
    
    factory: ViewModelProvider.Factory? = null,
    
    
    extras: CreationExtras = ...
    
    
    ): VM {
    
    
    val provider = if (factory != null) {
    
    
    ViewModelProvider(this.viewModelStore, factory, extras)
    
    
    } else if (this is HasDefaultViewModelProviderFactory) {
    
    
    ViewModelProvider(this.viewModelStore, this.defaultViewModelProviderFactory, extras)
    
    
    } else {
    
    
    ViewModelProvider(this)
    
    
    }
    
    
    return if (key != null) {
    
    
    provider[key, javaClass]
    
    
    } else {
    
    
    provider[javaClass]
    
    
    }
    
    
    }
    Library Internal
    Activity੄ Factoryী ੽Ӕ೤פ׮.
    

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47. // app/build.gradle
    
    
    apply plugin: 'kotlin-kapt'
    
    
    dependencies {
    
    
    implementation 'androidx.hilt:hilt-work:1.0.0'
    
    
    kapt 'androidx.hilt:hilt-compiler:1.0.0'
    
    
    }
    WorkManager
    (1) WorkManagerח ۄ੉࠳۞ܻܳ ୶о ࢸ஖೧ঠ ೤פ׮.
    

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48. @HiltWorker
    
    
    class ExampleWorker @AssistedInject constructor(
    
    
    @Assisted appContext: Context,
    
    
    @Assisted workerParams: WorkerParameters,
    
    
    bar: Bar,
    
    
    ) : CoroutineWorker(appContext, workerParams) {
    
    
    override suspend fun doWork(): Result {
    
    
    ...
    
    
    return Result.success()
    
    
    }
    
    
    }
    (2) Workerח AndroidEntryPoint ؀न, HiltWorkerܳ ࢎਊ೤פ׮.
    
    ӒܻҊ Inject ؀न, AssistedInject / Assistedܳ ੉ਊೞৈ ࢤࢿ੗ী ӝࠄ ݒѐ߸ࣻܳ ઱ੑ೤פ׮.
    

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49. public final class ExampleWorker_Factory {
    
    
    private final Provider exampleProvider;
    
    
    public ExampleWorker_Factory(Provider exampleProvider) {
    
    
    this.exampleProvider = exampleProvider;
    
    
    }
    
    
    public ExampleWorker get(Context context, WorkerParameters params) {
    
    
    return newInstance(context, params, exampleProvider.get());
    
    
    }
    
    
    ...
    
    
    public static ExampleWorker newInstance(Context context, WorkerParameters params,
    
    
    ExampleUseCase example) {
    
    
    return new ExampleWorker(context, params, example);
    
    
    }
    
    
    }
    Generated
    ੄ઓࢿਸ ୶оೞח Factory৬
    

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50. public interface ExampleWorker_AssistedFactory extends WorkerAssistedFactory {}
    
    
    public final class ExampleWorker_AssistedFactory_Impl implements ExampleWorker_AssistedFactory {
    
    
    private final ExampleWorker_Factory delegateFactory;
    
    
    ExampleWorker_AssistedFactory_Impl(ExampleWorker_Factory delegateFactory) {
    
    
    this.delegateFactory = delegateFactory;
    
    
    }
    
    
    @Override
    
    
    public ExampleWorker create(Context context, WorkerParameters parameters) {
    
    
    return delegateFactory.get(context, parameters);
    
    
    }
    
    
    public static Provider create(
    
    
    ExampleWorker_Factory delegateFactory) {
    
    
    return InstanceFactory.create(new ExampleWorker_AssistedFactory_Impl(delegateFactory));
    
    
    }
    
    
    }
    Generated
    ӝࠄ ݒѐ߸ࣻܳ ୶оೞח Factory. 2о૑о ࢤࢿؾפ׮.
    

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51. public interface WorkerAssistedFactory {
    
    
    @NonNull
    
    
    T create(@NonNull Context context, @NonNull WorkerParameters parameters);
    
    
    }
    
    
    @Module
    
    
    @InstallIn(SingletonComponent.class)
    
    
    public interface ExampleWorker_HiltModule {
    
    
    @Binds
    
    
    @IntoMap
    
    
    @StringKey("com.example.dagger.hilt.ExampleWorker")
    
    
    WorkerAssistedFactory extends ListenableWorker> bind(ExampleWorker_AssistedFactory factory);
    
    
    }
    Generated
    Bindsܳ ੉ਊೞৈ, Workerо Mapਵ۽ ޘੑפ׮.
    

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52. @Module
    
    
    @InstallIn(SingletonComponent.class)
    
    
    abstract class WorkerFactoryModule {
    
    
    @NonNull
    
    
    @Multibinds
    
    
    abstract Map> workerFactoriesMap();
    
    
    @NonNull
    
    
    @Provides
    
    
    static HiltWorkerFactory provideFactory(@NonNull Map
    
    Provider>> workerFactories) {
    
    
    return new HiltWorkerFactory(workerFactories);
    
    
    }
    
    
    }
    Generated
    ݽٚ Worker੄ Providerח HiltWorkerFactoryী ੹׳ؾפ׮.
    

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53. public final class HiltWorkerFactory extends androidx.work.WorkerFactory {
    
    
    private final Map
    
    Provider>> mWorkerFactories;
    
    
    ...
    
    
    @Nullable
    
    
    @Override
    
    
    public ListenableWorker createWorker(@NonNull Context appContext,
    
    
    @NonNull String workerClassName, @NonNull WorkerParameters workerParameters) {
    
    
    Provider> factoryProvider =
    
    
    mWorkerFactories.get(workerClassName);
    
    
    if (factoryProvider == null) {
    
    
    return null;
    
    
    }
    
    
    return factoryProvider.get().create(appContext, workerParameters);
    
    
    }
    
    
    }
    Library Internal
    п Providerח Workerܳ पઁ۽ ࢤࢿ೧ঠ ೡ ٸ ࢎਊؾפ׮.
    

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54. @HiltAndroidApp
    
    
    class ExampleApplication : Application(), Configuration.Provider {
    
    
    @Inject lateinit var workerFactory: HiltWorkerFactory
    
    
    override fun getWorkManagerConfiguration() =
    
    
    Configuration.Builder()
    
    
    .setWorkerFactory(workerFactory)
    
    
    .build()
    
    
    }
    
    
    val exampleWorkRequest: WorkRequest = OneTimeWorkRequestBuilder().build()
    
    
    WorkManager.getInstance(context).enqueue(exampleWorkRequest)
    (3) HiltWorkerFactoryܳ Applicationী ઱ੑ ߉ই, WorkManagerܳ ୡӝചೞݶ ࢸ੿੉ ৮ܐؾפ׮.
    

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55. Thinking Usages
    
    about Dagger Hilt
    Section #2
    Dagger Hilt ࢎਊߑߨী ؀೧ ࢤп೧ࠁӝ
    

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56. Section #2
    WorkManagerח ؀ࠗ࠙੄ ߔӒۄ਍٘ ੘সী
    ӂ੢ೞח ӝࠄ API۽, ౠ൤ Android 14 ࠗఠח
    FGSܳ ؀नೞח ߑߨਵ۽ب ӂ੢ೞҊ ੓׮.
    
    ੼੼ ؊ ݆੉ ࢎਊೞҊ ੓ח, WorkManagerী
    ੄ઓࢿ ઱ੑೡ ٸ Ҋ޹ೡ݅ೠ ࠗ࠙ਸ ࢓ಝࠁ੗.
    Coroutinesח উ٘۽੉٘ জীࢲ
    
    ࠺زӝ ୊ܻী ݆੉ ࢎਊغח ߑߨ੉׮.
    
    ࢎਊೞח ਤ஖ী ٮۄ যڃ CoroutineScopeܳ
    ࢎਊೞח Ѫ੉ ੸੺ೠ૑ Ҋ޹೧ࠁ੗.
    WorkManager Coroutines
    উ٘۽੉٘ জ਷ ӝࠄ ஹನք౟ ৻ীب
    
    ׮নೠ ۄ੉࠳۞ܻܳ ੉ਊೞৈ ѐߊೠ׮.
    
    ੉۠ ۄ੉࠳۞ܻܳ ࢎਊೡ ٸ ੄ઓࢿਸ ઱ੑೞח
    
    ߑߨਵ۽ EntryPoint ࢎਊਸ Ҋ޹೧ࠁ੗.
    EntryPoint
    Thinking Usages
    

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57. Section #2
    о੉٘ ޙࢲীࢲח ࢸݺೞ૑ ঋח ࠗ࠙ਸ Ҋ޹೧ࠁ੗.
    
    • WorkManagerܳ ࢎਊೞ۰ݶ ೦࢚ Contextо ೙ਃೞ׮.
    
    • ࢎਊೡ ࣻ ੓ח ਤ஖о ઁೠغח ޙઁܳ DI۽ ೧Ѿೡ ࣻ ੓׮.
    
    • WorkManagerח যڃ ࠗ࠙ਸ పझ౟ೞח Ѫ੉ જਸө?
    
    • Worker੄ ز੘ਸ పझ౟ೠ׮. (X)
    
    • Worker۽ प೯ೞ۰ח ۽૒ਸ పझ౟ೠ׮. (O)
    
    • WorkManager ੄ઓࢿਸ ऀѹࢲ, ਗೞח ࠗ࠙݅ਸ పझ౟ೡ ࣻ ੓׮.
    Thinking about WorkManager
    Link: https://developer.android.com/training/dependency-injection/hilt-jetpack#workmanager
    

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58. // Problem 1:
    
    
    val context: Context = ... // Where this from?
    
    
    val request = OneTimeWorkRequestBuilder()
    
    
    .addTag(ExampleWorker.TAG)
    
    
    .build()
    
    
    WorkManager.getInstance(context).enqueue(request)
    WorkManagerܳ ࢎਊೞ۰ݶ Contextо ೙ਃೞ׮.
    WorkManager
    Context
    

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59. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object TasksModule {
    
    
    
    
    @Singleton
    
    
    @Provides
    
    
    fun provideWorkManager(
    
    
    @ApplicationContext context: Context,
    
    
    ): WorkManager {
    
    
    return WorkManager.getInstance(context)
    
    
    }
    
    
    }
    DIܳ ੉ਊೞৈ, Context ੄ઓࢿਸ ऀӡ ࣻ ੓Ҋ
    WorkManager
    

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60. @AndroidEntryPoint
    
    
    class ExampleActivity : Activity() {
    
    
    @Inject lateinit var workManager: WorkManager
    
    
    }
    
    
    @HiltViewModel
    
    
    class ExampleViewModel @Inject constructor(
    
    
    private val workManager: WorkManager
    
    
    ) : ViewModel()
    ࢎਊೞ۰ח Ҕী WorkManager۽ ઱ੑ߉ਸ ࣻ ੓णפ׮.
    Example
    
    ViewModel
    WorkManager
    Example
    
    Activity
    

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61. // Problem 2:
    
    
    @AndroidEntryPoint
    
    
    class ExampleActivity : Activity() {
    
    
    @Inject lateinit var workManager: WorkManager
    
    
    }
    
    
    @HiltViewModel
    
    
    class ExampleViewModel @Inject constructor(
    
    
    private val workManager: WorkManager
    
    
    ) : ViewModel()
    
    
    val request = OneTimeWorkRequestBuilder()
    
    
    .addTag(ExampleWorker.TAG)
    
    
    .build()
    
    
    workManager.enqueue(request)
    ೞ૑݅ Worker, WorkManager ١ ೒ۖಬ ௿ېझী ੄ઓࢿਸ ыѱ ؾפ׮.
    WorkManager
    Example
    
    Activity
    Example
    
    Worker
    

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62. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    interface TasksBindsModule {
    
    
    @Binds fun bindsExampleTasks(impl: ExampleTasksImpl): ExampleTasks
    
    
    }
    
    
    interface ExampleTasks {
    
    
    fun execute()
    
    
    }
    
    
    class ExampleTasksImpl @Inject constructor(
    
    
    private val workManager: WorkManager,
    
    
    ) : ExampleTasks {
    
    
    override fun execute() {
    
    
    val request = OneTimeWorkRequestBuilder()
    
    
    .addTag(ExampleWorker.TAG)
    
    
    .build()
    
    
    workManager.enqueue(request)
    
    
    }
    
    
    }
    DIܳ ੉ਊೞৈ, ز੘਷ زੌೞ૑݅
    WorkManager
    Example
    
    Worker
    Example
    
    Tasks
    

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63. @AndroidEntryPoint
    
    
    class ExampleActivity : Activity() {
    
    
    @Inject lateinit var exampleTasks: ExampleTasks
    
    
    }
    
    
    @HiltViewModel
    
    
    class ExampleViewModel @Inject constructor(
    
    
    private val exampleTasks: ExampleTasks
    
    
    ) : ViewModel()
    
    
    exampleTasks.execute()
    ೒ۖಬ ௿ېझী ؀ೠ ੄ઓࢿਸ ऀӡ ࣻ ੓णפ׮.
    ExampleTasks
    Example
    
    ViewModel
    Example
    
    Activity
    

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64. // Problem 3:
    
    
    @HiltWorker
    
    
    class ExampleWorker @AssistedInject constructor(
    
    
    @Assisted context: Context,
    
    
    @Assisted params: WorkerParameters,
    
    
    private val primary: PrimaryDependency,
    
    
    private val secondary: SecondaryDependency,
    
    
    private val tertiary: TertiaryDependency,
    
    
    ) : CoroutineWorker(context, params) {
    
    
    override suspend fun doWork(): Result {
    
    
    val success = /* Complex codes to test */
    
    
    return if (success) {
    
    
    Result.success()
    
    
    } else {
    
    
    Result.failure()
    
    
    }
    
    
    }
    
    
    }
    Worker੄ ز੘җ ࠺ૉפझ ۽૒੉ ೠؘ ࢴৈ ੓णפ׮.
    

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65. @HiltWorker
    
    
    class ExampleWorker @AssistedInject constructor(
    
    
    @Assisted context: Context,
    
    
    @Assisted params: WorkerParameters,
    
    
    private val example: ExampleUseCase,
    
    
    ) : CoroutineWorker(context, params) {
    
    
    override suspend fun doWork(): Result {
    
    
    val success = example()
    
    
    return if (success) {
    
    
    Result.success()
    
    
    } else {
    
    
    Result.failure()
    
    
    }
    
    
    }
    
    
    }
    DIܳ ੉ਊೞৈ, ࠺ૉפझ ۽૒݅ ܻ࠙ೞৈ
    

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66. interface ExampleUseCase {
    
    
    operator suspend fun invoke(): Boolean
    
    
    }
    
    
    class ExampleUseCaseImpl @Inject constructor(
    
    
    private val primary: PrimaryDependency,
    
    
    private val secondary: SecondaryDependency,
    
    
    private val tertiary: TertiaryDependency,
    
    
    ) : ExampleUseCase {
    
    
    override operator suspend fun invoke(): Boolean {
    
    
    return /* Complex codes to test */
    
    
    }
    
    
    }
    
    
    @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    interface TasksBindsModule {
    
    
    @Binds fun bindsExampleUseCase(impl: ExampleUseCaseImpl): ExampleUseCase
    
    
    }
    Worker੄ ৉ೡਸ ୭ࣗചೡ ࣻ ੓णפ׮.
    

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67. Section #2
    పझ౟ܳ Ҋ۰ೞৈ, CoroutineDispatcherܳ ૒੽ ੑ۱ೞ૑
    ঋҊ ੄ઓࢿ ઱ੑೞৈ ࢎਊೞח ߑߨਸ ࢓ಝࠄ׮.
    
    Qualifierܳ ੉ਊೞৈ, ׮নೠ CoroutineDispatcherܳ ҳ
    ࠙ೞৈ ઱ੑೡ ࣻ ੓׮.
    জীࢲ ࢎਊೞӝ ੸׼ೠ CoroutineScopeܳ ࢓ಝࠁ੗.
    
    ౠ൤, Application ژח Service ߧਤ ղীࢲ ௏ܖ౯ਸ ҙܻ
    ೞח ߑߨਸ ঌইࠁҊ, Hilt۽ ੄ઓࢿ ઱ੑೞח Ѫ੉ о੢ જ਷
    ߑߨੋ૑ Ҋ޹೧ ࠁ੗.
    CoroutineDispatcher CoroutineScope
    Thinking about Coroutines
    

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68. class Example {
    
    
    suspend fun doSomething(): Boolean {
    
    
    return withContext(Dispatchers.Default) { /* do something! */ }
    
    
    }
    
    
    }
    
    
    @Test
    
    
    fun test() {
    
    
    val example = Example()
    
    
    assertTrue(example.doSomething())
    
    
    }
    ௏ܖ౯੉ ನೣغݶ যڌѱ పझ౟ೞաਃ?
    Link: https://developer.android.com/kotlin/coroutines/coroutines-best-practices#inject-dispatchers
    

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69. class Example(
    
    
    private val defaultDispatcher: CoroutineDispatcher = Dispatchers.Default,
    
    
    ) {
    
    
    suspend fun doSomething(): Boolean {
    
    
    return withContext(defaultDispatcher) { /* do something! */ }
    
    
    }
    
    
    }
    
    
    @Test
    
    
    fun test() {
    
    
    val testDispatcher: TestDispatcher = UnconfinedTestDispatcher()
    
    
    val example = Example(testDispatcher)
    
    
    assertTrue(example.doSomething())
    
    
    }
    DIܳ ੉ਊೞৈ, TestDispatcherܳ ઱ੑೡ ࣻ ੓णפ׮.
    Link: https://developer.android.com/kotlin/coroutines/coroutines-best-practices#inject-dispatchers
    

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70. class Example @Inject constructor(
    
    
    private val defaultDispatcher: CoroutineDispatcher,
    
    
    ) {
    
    
    suspend fun doSomething(): Boolean {
    
    
    return withContext(defaultDispatcher) { /* do something! */ }
    
    
    }
    
    
    }
    
    
    @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @Provides
    
    
    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default
    
    
    }
    Hiltܳ ੉ਊೠ ௏٘ੑפ׮.
    

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71. class Example @Inject constructor(
    
    
    private val defaultDispatcher: CoroutineDispatcher,
    
    
    ) {
    
    
    suspend fun doSomething(): Boolean {
    
    
    return withContext(defaultDispatcher) { /* do something! */ }
    
    
    }
    
    
    }
    
    
    @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @Provides
    
    
    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default
    
    
    @Provides
    
    
    fun providesIoDispatcher(): CoroutineDispatcher = Dispatchers.IO // ???
    
    
    }
    Ӓؘ۠ ׮ܲ ਬഋ੉ ೙ਃೞ׮ݶ যڌѱ ೧ঠ ೡөਃ?
    

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72. @Qualifier
    
    
    @Retention(AnnotationRetention.BINARY)
    
    
    annotation class DefaultDispatcher
    
    
    @Qualifier
    
    
    @Retention(AnnotationRetention.BINARY)
    
    
    annotation class IoDispatcher
    
    
    @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @DefaultDispatcher
    
    
    @Provides
    
    
    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default
    
    
    @IoDispatcher
    
    
    @Provides
    
    
    fun providesIoDispatcher(): CoroutineDispatcher = Dispatchers.IO
    
    
    }
    Qualifierܳ ੉ਊೞݶ ؾפ׮.
    Link: https://medium.com/androiddevelopers/create-an-application-coroutinescope-using-hilt-dd444e721528
    

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73. class Example @Inject constructor(
    
    
    @DefaultDispatcher private val defaultDispatcher: CoroutineDispatcher,
    
    
    ) {
    
    
    suspend fun doSomething(): Boolean {
    
    
    return withContext(defaultDispatcher) { /* do something! */ }
    
    
    }
    
    
    }
    
    
    @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @DefaultDispatcher
    
    
    @Provides
    
    
    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default
    
    
    @IoDispatcher
    
    
    @Provides
    
    
    fun providesIoDispatcher(): CoroutineDispatcher = Dispatchers.IO
    
    
    }
    Default Dispatcherܳ ઱ੑೞח ௏٘ੑפ׮.
    

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74. class Example @Inject constructor(
    
    
    @IoDispatcher private val ioDispatcher: CoroutineDispatcher,
    
    
    ) {
    
    
    suspend fun doSomething(): Boolean {
    
    
    return withContext(defaultDispatcher) { /* do something! */ }
    
    
    }
    
    
    }
    
    
    @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @DefaultDispatcher
    
    
    @Provides
    
    
    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default
    
    
    @IoDispatcher
    
    
    @Provides
    
    
    fun providesIoDispatcher(): CoroutineDispatcher = Dispatchers.IO
    
    
    }
    IO Dispatcherܳ ઱ੑೞח ௏٘ੑפ׮.
    

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75. Section #2
    Application ߧਤীࢲ CoroutineScopeܳ ࢎਊೞח ߑߨਸ ࢓ಝࠁ੗.
    
    ৘ܳ ٜয,
    
    • DataStore ୡӝച
    
    • ૑಴ ࣻ૘
    
    • ௿ۄ਋٘ ߔস
    CoroutineScope in Application?
    Link: https://medium.com/androiddevelopers/create-an-application-coroutinescope-using-hilt-dd444e721528
    

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76. class Example {
    
    
    fun doSomething() {
    
    
    GlobalScope.launch { // X
    
    
    /* do something! */
    
    
    }
    
    
    }
    
    
    }
    Link: https://medium.com/androiddevelopers/coroutines-patterns-for-work-that-shouldnt-be-cancelled-e26c40f142ad
    GlobalScopeח పझ౟ܳ য۵ѱ ٜ݅যࢲ ӂ੢ೞ૑ ঋणפ׮.
    

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77. class Example {
    
    
    fun doSomething() {
    
    
    // androidx.lifecycle:lifecycle-process
    
    
    ProcessLifecycleOwner.get().lifecycleScope.launch {
    
    
    /* do something! */
    
    
    }
    
    
    }
    
    
    }
    Link: https://medium.com/androiddevelopers/coroutines-patterns-for-work-that-shouldnt-be-cancelled-e26c40f142ad
    ؀উਵ۽ ProcessLifecycleOwner੉ ੓णפ׮݅,
    

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78. class Example @Inject constructor(
    
    
    @ApplicationScope private val lifecycleOwner: LifecycleOwner, // X
    
    
    ) {
    
    
    fun doSomething() {
    
    
    lifecycleOwner.lifecycleScope.launch {
    
    
    /* do something! */
    
    
    }
    
    
    }
    
    
    }
    
    
    @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object ApplicationModule {
    
    
    @ApplicationScope
    
    
    @Provides
    
    
    fun providesProcessLifecycleOwner(): LifecycleOwner = ProcessLifecycleOwner.get()
    
    
    }
    Link: https://developer.android.com/reference/androidx/lifecycle/ProcessLifecycleOwner
    ݃ଲо૑۽ పझ౟ܳ য۵ѱ ٜ݅য ӂ੢ೞ૑ ঋणפ׮.
    

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79. Library Internal
    // androidx.lifecycle:lifecycle-runtime-ktx
    
    
    public val LifecycleOwner.lifecycleScope: LifecycleCoroutineScope
    
    
    get() = lifecycle.coroutineScope
    
    
    public val Lifecycle.coroutineScope: LifecycleCoroutineScope
    
    
    get() {
    
    
    while (true) {
    
    
    val existing = mInternalScopeRef.get() as LifecycleCoroutineScopeImpl?
    
    
    if (existing != null) {
    
    
    return existing
    
    
    }
    
    
    val newScope = LifecycleCoroutineScopeImpl(
    
    
    this,
    
    
    SupervisorJob() + Dispatchers.Main.immediate
    
    
    )
    
    
    if (mInternalScopeRef.compareAndSet(null, newScope)) {
    
    
    newScope.register()
    
    
    return newScope
    
    
    }
    
    
    
    
    Link: https://developer.android.com/topic/libraries/architecture/coroutines#lifecyclescope
    ؀न lifecycleScope ղࠗ ௏٘ܳ ଵҊೞৈ,
    

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80. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @ApplicationScope
    
    
    @Singleton
    
    
    @Provides
    
    
    fun providesApplicationCoroutineScope(
    
    
    @MainImmediateDispatcher mainImmediateDispatcher: CoroutineDispatcher
    
    
    ): CoroutineScope = CoroutineScope(context = SupervisorJob() + mainImmediateDispatcher)
    
    
    @MainImmediateDispatcher
    
    
    @Provides
    
    
    fun providesMainImmediateDispatcher(): CoroutineDispatcher = Dispatchers.Main.immediate
    
    
    }
    Application ߧਤ੄ CoroutineScopeܳ ૒੽ ࢤࢿೞח Ѫਸ ӂ੢೤פ׮.
    Link: https://medium.com/androiddevelopers/create-an-application-coroutinescope-using-hilt-dd444e721528
    

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81. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @ApplicationScope
    
    
    @Singleton
    
    
    @Provides
    
    
    fun providesApplicationCoroutineScope(
    
    
    @MainImmediateDispatcher mainImmediateDispatcher: CoroutineDispatcher
    
    
    ): CoroutineScope = CoroutineScope(context = SupervisorJob() + mainImmediateDispatcher)
    
    
    @MainImmediateDispatcher
    
    
    @Provides
    
    
    fun providesMainImmediateDispatcher(): CoroutineDispatcher = Dispatchers.Main.immediate
    
    
    }
    
    
    Dispatcherܳ ࢶఖೡ ٸ, Application ١ UI ۽૒ী ઱۽ ࢎਊೠ׮ݶ
    
    ࣽࢲ ࠁ੢੉ غח Main.immediateܳ ࢎਊೡ ࣻ ੓Ҋ,
    

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82. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @ApplicationScope
    
    
    @Singleton
    
    
    @Provides
    
    
    fun providesApplicationCoroutineScope(
    
    
    @DefaultDispatcher defaultDispatcher: CoroutineDispatcher
    
    
    ): CoroutineScope = CoroutineScope(context = SupervisorJob() + defaultDispatcher)
    
    
    @DefaultDispatcher
    
    
    @Provides
    
    
    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default
    
    
    }
    
    
    Background ੘সী ઱۽ ࢎਊೠ׮ݶ
    
    Dispatcher ੹ജ੉ ੸ب۾ Defaultܳ ࢎਊೡ ࣻ ੓णפ׮.
    

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83. @Module
    
    
    @InstallIn(SingletonComponent::class)
    
    
    object DispatchersModule {
    
    
    @ApplicationScope
    
    
    @Singleton
    
    
    @Provides
    
    
    fun providesApplicationCoroutineScope(
    
    
    @DefaultDispatcher defaultDispatcher: CoroutineDispatcher
    
    
    ): CoroutineScope = CoroutineScope(context = SupervisorJob() + defaultDispatcher)
    
    
    }
    
    
    class Example @Inject constructor(
    
    
    @ApplicationScope private val applicationScope: CoroutineScope,
    
    
    ) {
    
    
    fun doSomething() {
    
    
    applicationScope.launch { /* do something! */ }
    
    
    }
    
    
    }
    Qualifier۽ CoroutineScopeܳ ઱ੑೞݶ ؾפ׮.
    

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84. Section #2
    Service ߧਤীࢲ CoroutineScopeܳ ࢎਊೞח ߑߨਸ ࢓ಝࠁ੗.
    
    ৘ܳ ٜয,
    
    • ׮਍۽٘/স۽٘
    
    • ਺ঈ ੤ࢤ
    
    • ղ࠺ѱ੉࣌
    CoroutineScope in Service?
    

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85. @Module
    
    
    @InstallIn(ServiceComponent::class)
    
    
    object ServiceModule {
    
    
    @ServiceScope // ???
    
    
    @ServiceScoped
    
    
    @Provides
    
    
    fun providesServiceScope(
    
    
    @MainImmediateDispatcher dispatcher: CoroutineDispatcher
    
    
    ): CoroutineScope = CoroutineScope(context = SupervisorJob() + dispatcher)
    
    
    }
    
    
    @Qualifier
    
    
    @Retention(AnnotationRetention.BINARY)
    
    
    annotation class ServiceScope
    ૒੽ ࢤࢿೞח ߑߨ੉ ݢ੷ ځয়ܰחؘਃ. Serviceо ઙܐؼ ٸח যڌѱ ஂࣗೡөਃ?
    

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86. class ExampleActivity : androidx.core.app.ComponentActivity() {
    
    
    private fun doSomething() {
    
    
    lifecycleScope.launch {
    
    
    /* do something! */
    
    
    }
    
    
    }
    
    
    }
    
    
    package androidx.core.app;
    
    
    public class ComponentActivity extends Activity implements LifecycleOwner { ... }
    ׮ܲ ஹನք౟৬ ࠺Ү೧ࠁݶ, Activityח Lifecycleਸ Ҋ۰ೠ CoroutineScopeܳ ઁҕೞҊ
    

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87. class ExampleFragment : androidx.fragment.app.Fragment() {
    
    
    private fun doSomething() {
    
    
    lifecycleScope.launch { /* do something! */ }
    
    
    viewLifecycleOwner.lifecycleScope.launch { /* do something! */ }
    
    
    }
    
    
    }
    
    
    package androidx.fragment.app;
    
    
    public class Fragment implements LifecycleOwner {
    
    
    @MainThread
    
    
    @NonNull
    
    
    public LifecycleOwner getViewLifecycleOwner() { ... }
    
    
    }
    Fragmentب Lifecycleਸ Ҋ۰ೠ CoroutineScopeܳ ઁҕ೤פ׮.
    

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88. class ExampleService : Service() {
    
    
    private fun doSomething() {
    
    
    lifecycleScope.launch { // X
    
    
    /* do something! */
    
    
    }
    
    
    }
    
    
    }
    
    
    package android.app;
    
    
    public abstract class Service extends ContextWrapper { ... } // X
    ইऔѱب Serviceח LifecycleOwnerܳ ҳഅೞ૑ ঋই, ࢎਊೡ ࣻ হחؘਃ.
    

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89. class ExampleService : LifecycleService() {
    
    
    private fun doSomething() {
    
    
    lifecycleScope.launch {
    
    
    /* do something! */
    
    
    }
    
    
    }
    
    
    }
    
    
    // androidx.lifecycle:lifecycle-service
    
    
    package androidx.lifecycle;
    
    
    public class LifecycleService extends Service implements LifecycleOwner { ... }
    Link: https://dagger.dev/hilt/entry-points
    ؀न LifecycleServiceܳ ੉ਊೞৈ, Lifecycleਸ Ҋ۰ೠ CoroutineScopeܳ ࢎਊೡ ࣻ ੓णפ׮.
    

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90. Section #2
    • Qualifierܳ ੉ਊೞৈ, ׮নೠ CoroutineDispatcherܳ ҳ࠙ೞৈ ઱ੑೡ ࣻ ੓׮.
    
    
    • Application ߧਤীࢲח ࢤݺ઱ӝо ೙ਃೠ ҃਋݅ ProcessLifecycleOwnerܳ ࢎਊೞҊ,
    
    Coroutines਷ DIܳ ੉ਊೞৈ Custom CoroutineScopeܳ ٜ݅য ࢎਊೞ੗.
    
    • উ٘۽੉٘ ೒ۖಬ੄ ҳࢿਃࣗীࢲ ഐ୹ೞח Coroutines਷
    
    Lifecycle-aware CoroutineScopeܳ ੉ਊೞ੗.
    
    • Activity, Fragment, Service(=LifecycleService) -> lifecycleScope
    
    • ViewModel -> viewModelScope
    Coroutines Summary
    Link: https://en.wikipedia.org/wiki/Dependency_injection
    

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91. Section #2
    • Hiltо ઁҕೞ૑ ঋח ҳࢿਃࣗীب EntryPointܳ ੉ਊೞৈ ੄ઓࢿਸ ઱ੑೡ ࣻ ੓׮.
    
    • Contextী ੽Ӕೡ ࣻ ੓׮ݶ Application ߧਤ੄ ੄ઓࢿਸ ઱ੑೡ ࣻ ੓׮.
    
    • ׮নೠ ۄ੉࠳۞ܻ৬ ো҅ೞৈ ഝਊೡ ࣻ ੓׮.
    
    • Startup, Glide ١١
    Thinking about EntryPoint
    Link: https://dagger.dev/hilt/entry-points
    

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92. // Startup: Constructor Injection (X)
    
    
    class ExampleInitializer @Inject constructor( // X
    
    
    private val bar: Bar,
    
    
    ) : Initializer {
    
    
    override fun create(context: Context): Example {
    
    
    ...
    
    
    }
    
    
    }
    Startupҗ э਷ ۄ੉࠳۞ܻܳ ੉ਊೞ׮ ࠁݶ, ࢤࢿ੗ ઱ੑਸ ೞ૑ ޅೡ ࣻ ੓णפ׮.
    

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93. // Startup: Field Injection (X)
    
    
    @AndroidEntryPoint // X
    
    
    class ExampleInitializer : Initializer {
    
    
    @Inject lateinit var bar: Bar,
    
    
    override fun create(context: Context): Example {
    
    
    ...
    
    
    }
    
    
    }
    ੉۠ ҃਋ীח AndroidEntryPointب ૑ਗೞ૑ ঋই ೙٘ ઱ੑب য۵ҳਃ.
    

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94. // Startup: Alternatives (?)
    
    
    class ExampleInitializer : Initializer {
    
    
    override fun create(context: Context): Example {
    
    
    ...
    
    
    }
    
    
    }
    ੉ ٸ, Contextী ੽Ӕೡ ࣻ ੓ਵݶ
    

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95. // Startup: EntryPoint
    
    
    class ExampleInitializer : Initializer {
    
    
    @EntryPoint
    
    
    @InstallIn(SingletonComponent::class)
    
    
    interface ExampleInitializerEntryPoint {
    
    
    fun providesBar(): Bar
    
    
    }
    
    
    override fun create(context: Context): Example {
    
    
    val entryPoint = EntryPointAccessors.fromApplication(
    
    
    context.applicationContext,
    
    
    ExampleInitializerEntryPoint::class.java
    
    
    )
    
    
    val bar = entryPoint.providesBar()
    
    
    ...
    
    
    }
    
    
    }
    EntryPointܳ ੉ਊೞৈ, Application ߧਤ੄ ੄ઓࢿਸ ઱ੑೡ ࣻ ੓णפ׮.
    

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96. // Glide: EntryPoint
    
    
    @GlideModule
    
    
    class ExampleAppGlideModule : AppGlideModule() {
    
    
    @EntryPoint
    
    
    @InstallIn(SingletonComponent::class)
    
    
    interface ExampleAppGlideModuleEntryPoint {
    
    
    fun providesBar(): Bar
    
    
    }
    
    
    
    
    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
    
    
    val entryPoint = EntryPointAccessors.fromApplication(
    
    
    context.applicationContext,
    
    
    ExampleAppGlideModuleEntryPoint::class.java
    
    
    )
    
    
    val bar = entryPoint.providesBar()
    
    
    ...
    
    
    }
    
    
    }
    ׮ܲ ৘द۽ Glide੄ ௏٘ੑפ׮.
    

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97. Section #2
    • Composeח ࢚కо ղ۰оҊ ੉߮౟о ৢۄоח
    
    ױߑೱ ؘ੉ఠ ൒ܴ(UDF) ಁఢਸ ӂ੢ೠ׮.
    
    • ݽٚ ੄ઓࢿਸ Composableী ݒѐ߸ࣻ۽ ੹׳ೡ
    
    ೙ਃח হب۾, CompositionLocalਸ ઁҕೠ׮.
    
    ੉۞ݶ ౠ੿ Composable ҅க ղীࢲ݅
    
    زੌೠ ੋझఢझܳ ࢎਊೡ ࣻ ੓׮.
    
    • Ӓؘ۠ জ ੹୓ীࢲ زੌೠ ੋझఢझܳ ࢎਊೞѢա
    
    ౠ੿ Composableীࢲ݅ ࢎਊೠ׮ݶ?
    Compose with EntryPoint
    Link: https://developer.android.com/jetpack/compose/state#state-hoisting
    

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98. // Option 1: State Hoisting
    
    
    Parents
    GrandParents Children GrandChildren
    Bar
    Bar Bar Bar
    Link: https://developer.android.com/jetpack/compose/state#state-hoisting
    ৘द۽ GrandChildrenীࢲ Barܳ ࢎਊೞ۰ݶ, пп੄ Composable ೣࣻܳ Ѣ୛ ੹׳ೡ ࣻ ੓णפ׮.
    

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99. // Option 1: State Hoisting
    
    
    @AndroidEntryPoint
    
    
    class ExampleActivity : Activity() {
    
    
    @Inject lateinit var bar: Bar
    
    
    override fun onCreate(savedInstanceState: Bundle?) {
    
    
    super.onCreate(savedInstanceState)
    
    
    setContent {
    
    
    GrandParents(bar = bar)
    
    
    }
    
    
    }
    
    
    }
    Link: https://developer.android.com/jetpack/compose/state#state-hoisting
    ௏٘۽ח, Activityী ઱ੑ߉਷ Barܳ GrandParentsী ੹׳ೞҊ
    

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100. // Option 1: State Hoisting
     
     
     @Composable fun GrandParents(bar: Bar) {
     
     
     Parents(bar = bar)
     
     
     }
     
     
     @Composable fun Parents(bar: Bar) {
     
     
     Children(bar = bar)
     
     
     }
     
     
     @Composable fun Children(bar: Bar) {
     
     
     GrandChildren(bar = bar)
     
     
     }
     
     
     @Composable fun GrandChildren(bar: Bar) {
     
     
     // Use bar
     
     
     }
     Link: https://developer.android.com/jetpack/compose/state#state-hoisting
     пп੄ Composableਸ Ѣ୛ GrandChildrenө૑ ੹׳ೡ ࣻ ੓णפ׮.
     

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101. // Option 1: State Hoisting
     
     
     @Composable fun GrandParents(bar: Bar) {
     
     
     Parents(bar = bar)
     
     
     }
     
     
     @Composable fun Parents(bar: Bar) {
     
     
     Children(bar = bar)
     
     
     }
     
     
     @Composable fun Children(bar: Bar) {
     
     
     GrandChildren(bar = bar)
     
     
     }
     
     
     @Composable fun GrandChildren(bar: Bar) {
     
     
     // Use bar
     
     
     }
     Link: https://developer.android.com/jetpack/compose/state#state-hoisting
     Ӓؘ۠ GrandChildrenীࢲ݅ ࢎਊೞחؘ, ݽٚ Composableਸ Ѣ୛оח Ѫ੉ ઑӘ җ೧ࠁ੉૑ ঋաਃ?
     

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102. // Option 2: CompositionLocal
     
     
     Parents
     GrandParents Children GrandChildren
     Bar
     Link: https://developer.android.com/jetpack/compose/compositionlocal
     LocalBar Bar
     CompositionLocalਸ ੉ਊೞৈ ѐࢶೡ ࣻ ੓णפ׮.
     

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103. // Option 2: CompositionLocal
     
     
     @AndroidEntryPoint
     
     
     class ExampleActivity : Activity() {
     
     
     @Inject lateinit var bar: Bar
     
     
     override fun onCreate(savedInstanceState: Bundle?) {
     
     
     super.onCreate(savedInstanceState)
     
     
     setContent {
     
     
     CompositionLocalProvider(LocalBar provides bar) {
     
     
     GrandParents()
     
     
     }
     
     
     }
     
     
     }
     
     
     }
     
     
     val LocalBar = staticCompositionLocalOf { error("...") }
     Link: https://developer.android.com/jetpack/compose/compositionlocal
     ௏٘۽ח, Activityী ઱ੑ ߉਷ Barܳ LocalBar۽ ઁҕೞҊ
     

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104. // Option 2: CompositionLocal
     
     
     @Composable fun GrandParents() {
     
     
     Parents()
     
     
     }
     
     
     @Composable fun Parents() {
     
     
     Children()
     
     
     }
     
     
     @Composable fun Children() {
     
     
     GrandChildren()
     
     
     }
     
     
     @Composable fun GrandChildren() {
     
     
     val bar: Bar = LocalBar.current
     
     
     // Use bar
     
     
     }
     Link: https://developer.android.com/jetpack/compose/compositionlocal
     GrandChildrenীࢲ LocalBarܳ ా೧, Barܳ оઉоݶ ؾפ׮.
     

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105. // Option 2: CompositionLocal
     
     
     @AndroidEntryPoint
     
     
     class ExampleActivity : Activity() {
     
     
     @Inject lateinit var bar: Bar
     
     
     @Inject lateinit var foo: Foo
     
     
     override fun onCreate(savedInstanceState: Bundle?) {
     
     
     super.onCreate(savedInstanceState)
     
     
     setContent {
     
     
     CompositionLocalProvider(
     
     
     LocalBar provides bar,
     
     
     LocalFoo provides foo,
     
     
     ) { ... }
     
     
     }
     
     
     }
     
     
     }
     Link: https://developer.android.com/jetpack/compose/compositionlocal#alternatives
     Ӓؘ۠ CompositionLocalܳ ੄بೠ؀۽ ࢎਊೠ Ѫ੉ ݏਸөਃ?
     
     ӒܻҊ ઱ੑ೧ঠ ೞח ೦ݾ੉ ੼੼ טযդ׮ݶ ҡଳਸөਃ?
     

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106. // Option 3: EntryPoint
     
     
     Parents
     GrandParents Children GrandChildren
     Bar
     Link: https://dagger.dev/hilt/entry-points
     য૵ݶ EntryPointо ೞա੄ ؀উ੉ ؼ ࣻب ੓ਸ Ѫ эणפ׮.
     

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107. // Option 3:
     
     
     @AndroidEntryPoint
     
     
     class ExampleActivity : Activity() {
     
     
     // @Inject lateinit var bar: Bar
     
     
     override fun onCreate(savedInstanceState: Bundle?) {
     
     
     super.onCreate(savedInstanceState)
     
     
     setContent {
     
     
     GrandParents()
     
     
     }
     
     
     }
     
     
     }
     Link: https://dagger.dev/hilt/entry-points
     ௏٘۽ח, ؊ ੉࢚ Activityী ઱ੑ߉ਸ ೙ਃо হणפ׮.
     

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108. // Option 3:
     
     
     @Composable fun GrandParents() {
     
     
     Parents()
     
     
     }
     
     
     @Composable fun Parents() {
     
     
     Children()
     
     
     }
     
     
     @Composable fun Children() {
     
     
     GrandChildren()
     
     
     }
     
     
     @Composable fun GrandChildren() {
     
     
     val bar: Bar = rememberBar()
     
     
     // Use bar
     
     
     }
     Link: https://dagger.dev/hilt/entry-points
     CompositionLocal୊ۢ GrandChildrenীࢲ ߄۽ ଵઑೡ ࣻ ੓णפ׮.
     

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109. // Option 3:
     
     
     @Composable private fun rememberBar(): Bar {
     
     
     val context = LocalContext.current
     
     
     return remember {
     
     
     val entryPoint = EntryPointAccessors.fromApplication(
     
     
     context.applicationContext,
     
     
     ExampleEntryPoint::class.java,
     
     
     )
     
     
     entryPoint.providesBar()
     
     
     }
     
     
     }
     
     
     @EntryPoint
     
     
     @InstallIn(SingletonComponent::class)
     
     
     interface ExampleEntryPoint {
     
     
     fun providesBar(): Bar
     
     
     }
     Link: https://dagger.dev/hilt/entry-points
     ߑߨ਷ LocalContextܳ ੉ਊ೧,
     
     Application ߧਤ੄ ੄ઓࢿਸ ઱ੑೞח Ѫੑפ׮.
     

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110. DIܳ ࢎਊೞ۰ח ݾ੸ী ٮۄ, Dagger Hilt ࢎਊߑߨਸ Ҋ޹೧ࠁ੗.
     
     • ୭؀ೠ ೒ۖಬ ੄ઓࢿਸ ઴੉੗. (ex. WorkManager)
     
     • উ٘۽੉٘ ҳࢿਃࣗীࢲח Lifecycle-aware Coroutinesਸ ࢎਊೞ੗.
     
     • EntryPointܳ ੉ਊೞৈ, ۄ੉࠳۞ܻ ҙ۲ ௏٘ীب ੄ઓࢿ ઱ੑ੉ оמೞ׮.
     Wrap-Up
     

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111. Sungyong An NAVER WEBTOON
     Android GDE / ?
     Thank You
     Sungyong An NAVER WEBTOON
     Android GDE / @fornewid
     Slide Link: https://speakerdeck.com/fornewid
     

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