Add Application-wide CoroutineScope in the DI graph

Following the work of #607.

Author: SimonMarquis

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

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2023 The Android Open Source Project
+ *
+ *   Licensed under the Apache License, Version 2.0 (the "License");
+ *   you may not use this file except in compliance with the License.
+ *   You may obtain a copy of the License at
+ *
+ *       https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *   See the License for the specific language governing permissions and
+ *   limitations under the License.
+ */
+
+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 dagger.Module
+import dagger.Provides
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.SupervisorJob
+import javax.inject.Singleton
+
+@Module
+@InstallIn(SingletonComponent::class)
+object CoroutineScopesModule {
+    @Provides
+    @Singleton
+    @Dispatcher(IO)
+    fun providesIOCoroutineScope(
+        @Dispatcher(IO) ioDispatcher: CoroutineDispatcher,
+    ): CoroutineScope = CoroutineScope(SupervisorJob() + ioDispatcher)
+}

core/datastore-test/src/main/java/com/google/samples/apps/nowinandroid/core/datastore/test/TestDataStoreModule.kt

@@ -27,9 +27,7 @@ import dagger.Module
 import dagger.Provides
 import dagger.hilt.components.SingletonComponent
 import dagger.hilt.testing.TestInstallIn
-import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.SupervisorJob
 import org.junit.rules.TemporaryFolder
 import javax.inject.Singleton
 
@@ -43,13 +41,12 @@ object TestDataStoreModule {
     @Provides
     @Singleton
     fun providesUserPreferencesDataStore(
-        @Dispatcher(IO) ioDispatcher: CoroutineDispatcher,
+        @Dispatcher(IO) ioScope: CoroutineScope,
         userPreferencesSerializer: UserPreferencesSerializer,
         tmpFolder: TemporaryFolder,
     ): DataStore<UserPreferences> =
         tmpFolder.testUserPreferencesDataStore(
-            // TODO: Provide an application-wide CoroutineScope in the DI graph
-            coroutineScope = CoroutineScope(SupervisorJob() + ioDispatcher),
+            coroutineScope = ioScope,
             userPreferencesSerializer = userPreferencesSerializer,
         )
 }

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

@@ -30,9 +30,7 @@ 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 kotlinx.coroutines.SupervisorJob
 import javax.inject.Singleton
 
 @Module
@@ -43,12 +41,12 @@ object DataStoreModule {
     @Singleton
     fun providesUserPreferencesDataStore(
         @ApplicationContext context: Context,
-        @Dispatcher(IO) ioDispatcher: CoroutineDispatcher,
+        @Dispatcher(IO) ioScope: CoroutineScope,
         userPreferencesSerializer: UserPreferencesSerializer,
     ): DataStore<UserPreferences> =
         DataStoreFactory.create(
             serializer = userPreferencesSerializer,
-            scope = CoroutineScope(ioDispatcher + SupervisorJob()),
+            scope = ioScope,
             migrations = listOf(
                 IntToStringIdsMigration,
             ),