Add top level application scope, use IO dispatcher for DataStore

Change-Id: I1512b1665587c73abd5e8a78aa9abd3eed24ab79

core/common/src/main/java/com/google/samples/apps/nowinandroid/core/network/di/CoroutineScopesModule.kt

@@ -17,7 +17,7 @@
 package com.google.samples.apps.nowinandroid.core.network.di
 
 import com.google.samples.apps.nowinandroid.core.network.Dispatcher
-import com.google.samples.apps.nowinandroid.core.network.NiaDispatchers.IO
+import com.google.samples.apps.nowinandroid.core.network.NiaDispatchers.Default
 import dagger.Module
 import dagger.Provides
 import dagger.hilt.InstallIn
@@ -25,15 +25,20 @@ import dagger.hilt.components.SingletonComponent
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.SupervisorJob
+import javax.inject.Qualifier
 import javax.inject.Singleton
 
+@Retention(AnnotationRetention.RUNTIME)
+@Qualifier
+annotation class ApplicationScope
+
 @Module
 @InstallIn(SingletonComponent::class)
 object CoroutineScopesModule {
     @Provides
     @Singleton
-    @Dispatcher(IO)
-    fun providesIOCoroutineScope(
-        @Dispatcher(IO) ioDispatcher: CoroutineDispatcher,
-    ): CoroutineScope = CoroutineScope(SupervisorJob() + ioDispatcher)
+    @ApplicationScope
+    fun providesCoroutineScope(
+        @Dispatcher(Default) dispatcher: CoroutineDispatcher,
+    ): CoroutineScope = CoroutineScope(SupervisorJob() + dispatcher)
 }

core/datastore/src/main/java/com/google/samples/apps/nowinandroid/core/datastore/di/DataStoreModule.kt

@@ -25,11 +25,13 @@ import com.google.samples.apps.nowinandroid.core.datastore.UserPreferences
 import com.google.samples.apps.nowinandroid.core.datastore.UserPreferencesSerializer
 import com.google.samples.apps.nowinandroid.core.network.Dispatcher
 import com.google.samples.apps.nowinandroid.core.network.NiaDispatchers.IO
+import com.google.samples.apps.nowinandroid.core.network.di.ApplicationScope
 import dagger.Module
 import dagger.Provides
 import dagger.hilt.InstallIn
 import dagger.hilt.android.qualifiers.ApplicationContext
 import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import javax.inject.Singleton
 
@@ -41,12 +43,13 @@ object DataStoreModule {
     @Singleton
     fun providesUserPreferencesDataStore(
         @ApplicationContext context: Context,
-        @Dispatcher(IO) ioScope: CoroutineScope,
+        @Dispatcher(IO) ioDispatcher: CoroutineDispatcher,
+        @ApplicationScope scope: CoroutineScope,
         userPreferencesSerializer: UserPreferencesSerializer,
     ): DataStore<UserPreferences> =
         DataStoreFactory.create(
             serializer = userPreferencesSerializer,
-            scope = ioScope,
+            scope = CoroutineScope(scope.coroutineContext + ioDispatcher),
             migrations = listOf(
                 IntToStringIdsMigration,
             ),