Update README.md

README.md

@@ -30,11 +30,10 @@ dependencies {
 To use `Whetstone` you must initialized it in your Application class.
 
 ```kotlin
-class MyApplication : Application() {
+class MyApplication : Application(), ApplicationComponentOwner {
 
-    fun onCreate() {
-        Whetstone.initialize { DaggerGeneratedApplicationComponent.factory().create(this) }
-        super.onCreate()
+    val applicationComponent by lazy {
+        DaggerGeneratedApplicationComponent.factory().create(this)
     }
 }
 ```
@@ -60,13 +59,16 @@ Component lifetimes are generally bounded by the creation and destruction of a c
 
 ```kotlin
 @ContributesInjector(ApplicationScope::class)
-class MyApplication: Application() {
+class MyApplication: Application(), ApplicationComponentOwner {
+
+    val applicationComponent by lazy {
+        TODO("Create application component.")
+    }
 
     @Inject
     public lateinit var dependency: MyDependency
 
     fun onCreate() {
-        Whetstone.initialize { TODO("Create root component") }
         Whetstone.inject(application = this)
         super.onCreate()
     }

whetstone/src/main/java/com/deliveryhero/whetstone/Whetstone.kt

@@ -9,6 +9,7 @@ import androidx.fragment.app.FragmentFactory
 import androidx.lifecycle.Lifecycle
 import com.deliveryhero.whetstone.component.ActivityComponent
 import com.deliveryhero.whetstone.component.ApplicationComponent
+import com.deliveryhero.whetstone.component.ApplicationComponentOwner
 import com.deliveryhero.whetstone.injector.AnvilInjector
 import com.deliveryhero.whetstone.injector.ContributesInjector
 import java.util.concurrent.atomic.AtomicReference
@@ -26,7 +27,10 @@ public object Whetstone {
     }
 
     public fun <T : Any> fromApplication(application: Application): T {
-        return requireNotNull(root.get()) { "Whetstone must be initialized to be used." } as T
+        require(application is ApplicationComponentOwner) {
+            "Application must implement ${ApplicationComponentOwner::class.java.name} to use this Injector"
+        }
+        return application.applicationComponent as T
     }
 
     /**

whetstone/src/main/java/com/deliveryhero/whetstone/component/ApplicationComponentOwner.kt

@@ -0,0 +1,6 @@
+package com.deliveryhero.whetstone.component
+
+public interface ApplicationComponentOwner {
+
+    public val applicationComponent: ApplicationComponent
+}