Dagger Providers for CoroutineScope + Dispatchers

Fixes: 237408543
Test: mp droid
Change-Id: Ia37d7aecd07dd8a3d5827aee8bffe23109f3403f

packages/SystemUI/src/com/android/systemui/dagger/SystemUIModule.java

@@ -83,6 +83,7 @@ import com.android.systemui.unfold.SysUIUnfoldModule;
 import com.android.systemui.user.UserModule;
 import com.android.systemui.util.concurrency.SysUIConcurrencyModule;
 import com.android.systemui.util.dagger.UtilModule;
+import com.android.systemui.util.kotlin.CoroutinesModule;
 import com.android.systemui.util.sensors.SensorModule;
 import com.android.systemui.util.settings.SettingsUtilModule;
 import com.android.systemui.util.time.SystemClock;
@@ -115,6 +116,7 @@ import dagger.Provides;
             AssistModule.class,
             BiometricsModule.class,
             ClockModule.class,
+            CoroutinesModule.class,
             DreamModule.class,
             ControlsModule.class,
             DemoModeModule.class,

packages/SystemUI/src/com/android/systemui/util/kotlin/CoroutinesModule.kt

@@ -0,0 +1,41 @@
+package com.android.systemui.util.kotlin
+
+import com.android.systemui.dagger.SysUISingleton
+import com.android.systemui.dagger.qualifiers.Application
+import com.android.systemui.dagger.qualifiers.Background
+import com.android.systemui.dagger.qualifiers.Main
+import dagger.Module
+import dagger.Provides
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+
+/** Providers for various coroutines-related constructs. */
+@Module
+object CoroutinesModule {
+    @Provides
+    @SysUISingleton
+    @Application
+    fun applicationScope(
+        @Main dispatcher: CoroutineDispatcher,
+    ): CoroutineScope = CoroutineScope(dispatcher)
+
+    @Provides
+    @SysUISingleton
+    @Main
+    fun mainDispatcher(): CoroutineDispatcher = Dispatchers.Main.immediate
+
+    /**
+     * Provide a [CoroutineDispatcher] backed by a thread pool containing at most X threads, where
+     * X is the number of CPU cores available.
+     *
+     * Because there are multiple threads at play, there is no serialization order guarantee. You
+     * should use a [kotlinx.coroutines.channels.Channel] for serialization if necessary.
+     *
+     * @see Dispatchers.Default
+     */
+    @Provides
+    @SysUISingleton
+    @Background
+    fun bgDispatcher(): CoroutineDispatcher = Dispatchers.Default
+}