Adding WeakHashMap to hold scopes for ScopeProviders

android/demos/compose/src/main/kotlin/com/uber/rib/compose/root/main/MainInteractor.kt

@@ -35,10 +35,9 @@ class MainInteractor(
 
   override fun didBecomeActive(savedInstanceState: Bundle?) {
       super.didBecomeActive(savedInstanceState)
-      CoroutineScope(RibDispatchers.Main).launch {  }
 
       router.view.setContent { MainView(childContent = childContent) }
-    authStream.observe()
+      authStream.observe()
         .onEach {
             if (it.isLoggedIn) {
               router.detachLoggedOut()

android/demos/compose/src/main/kotlin/com/uber/rib/compose/root/main/logged_out/LoggedOutInteractor.kt

@@ -35,7 +35,6 @@ class LoggedOutInteractor(
   private val eventStream: EventStream<LoggedOutEvent>,
   private val stateStream: StateStream<LoggedOutViewModel>
 ) : BasicInteractor<ComposePresenter, LoggedOutRouter>(presenter) {
-
   override fun didBecomeActive(savedInstanceState: Bundle?) {
       super.didBecomeActive(savedInstanceState)
       eventStream.observe()

android/libraries/rib-coroutines/src/main/kotlin/com/uber/rib/core/RibCoroutines.kt

@@ -3,21 +3,31 @@ package com.uber.rib.core
 import com.uber.autodispose.ScopeProvider
 import com.uber.autodispose.coroutinesinterop.asCoroutineScope
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
+import java.util.*
+import kotlin.reflect.KProperty
 
-//TODO add weak hashmap to hold values of getters.
+val ScopeProvider.defaultScope by LazyWithReceiver<ScopeProvider, CoroutineScope> {
+    asCoroutineScope(SupervisorJob() + RibDispatchers.Main)
+}
 
-val ScopeProvider.defaultScope: CoroutineScope
-    get() = asCoroutineScope(SupervisorJob() + RibDispatchers.Default)
+val ScopeProvider.mainScope by LazyWithReceiver<ScopeProvider, CoroutineScope> {
+    asCoroutineScope(SupervisorJob() + RibDispatchers.Main)
+}
 
-val ScopeProvider.mainScope: CoroutineScope
-    get() = asCoroutineScope(SupervisorJob() + RibDispatchers.Main)
-
-val ScopeProvider.ioScope: CoroutineScope
-    get() = asCoroutineScope(SupervisorJob() + RibDispatchers.IO)
-
-val ScopeProvider.unconfinedScope: CoroutineScope
-    get() = asCoroutineScope(SupervisorJob() + RibDispatchers.Unconfined)
+val ScopeProvider.ioScope by LazyWithReceiver<ScopeProvider, CoroutineScope> {
+    asCoroutineScope(SupervisorJob() + RibDispatchers.IO)
+}
+val ScopeProvider.unconfinedScope by LazyWithReceiver<ScopeProvider, CoroutineScope> {
+    asCoroutineScope(SupervisorJob() + RibDispatchers.Unconfined)
+}
 
+private class LazyWithReceiver<This,Return>(val initializer:This.()->Return)
+{
+    private val values = WeakHashMap<This,Return>()
 
+    operator fun getValue(thisRef:This, property: KProperty<*>):Return = synchronized(values)
+    {
+        return values.getOrPut(thisRef) { thisRef.initializer() }
+    }
+}