BaseActivatable (465342be) · Commits · e / os / android_frameworks_base

packages/SystemUI/multivalentTests/src/com/android/systemui/lifecycle/SafeActivatableTest.kt→packages/SystemUI/multivalentTests/src/com/android/systemui/lifecycle/BaseActivatableTest.kt

+328 −0

Original line number	Diff line number	Diff line
		@@ -33,7 +33,7 @@ import org.junit.runner.RunWith

		@SmallTest
		@RunWith(AndroidJUnit4::class)
		class SafeActivatableTest : SysuiTestCase() {
		class BaseActivatableTest : SysuiTestCase() {

		private val kosmos = testKosmos()
		private val testScope = kosmos.testScope
		@@ -118,4 +118,211 @@ class SafeActivatableTest : SysuiTestCase() {
		underTest.activateIn(testScope)
		runCurrent()
		}

		@Test
		fun addChild_beforeActive_activatesChildrenOnceActivated() =
		testScope.runTest {
		val child1 = FakeActivatable()
		val child2 = FakeActivatable()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		assertThat(underTest.isActive).isFalse()
		underTest.addChild(child1)
		underTest.addChild(child2)
		assertThat(underTest.isActive).isFalse()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		underTest.activateIn(this)
		runCurrent()

		assertThat(underTest.isActive).isTrue()
		assertThat(child1.isActive).isTrue()
		assertThat(child2.isActive).isTrue()
		}

		@Test
		fun addChild_whileActive_activatesChildrenImmediately() =
		testScope.runTest {
		underTest.activateIn(this)
		runCurrent()
		assertThat(underTest.isActive).isTrue()

		val child1 = FakeActivatable()
		val child2 = FakeActivatable()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		underTest.addChild(child1)
		underTest.addChild(child2)
		runCurrent()

		assertThat(child1.isActive).isTrue()
		assertThat(child2.isActive).isTrue()
		}

		@Test
		fun addChild_afterCancellation_doesNotActivateChildren() =
		testScope.runTest {
		val job = Job()
		underTest.activateIn(this, context = job)
		runCurrent()
		assertThat(underTest.isActive).isTrue()
		job.cancel()
		runCurrent()
		assertThat(underTest.isActive).isFalse()

		val child1 = FakeActivatable()
		val child2 = FakeActivatable()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		underTest.addChild(child1)
		underTest.addChild(child2)
		runCurrent()

		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()
		}

		@Test
		fun activate_cancellation_cancelsCurrentChildren() =
		testScope.runTest {
		val job = Job()
		underTest.activateIn(this, context = job)
		runCurrent()
		assertThat(underTest.isActive).isTrue()

		val child1 = FakeActivatable()
		val child2 = FakeActivatable()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		underTest.addChild(child1)
		underTest.addChild(child2)
		runCurrent()

		assertThat(child1.isActive).isTrue()
		assertThat(child2.isActive).isTrue()

		job.cancel()
		runCurrent()
		assertThat(underTest.isActive).isFalse()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()
		}

		@Test
		fun activate_afterCancellation_reactivatesCurrentChildren() =
		testScope.runTest {
		val job = Job()
		underTest.activateIn(this, context = job)
		runCurrent()
		assertThat(underTest.isActive).isTrue()

		val child1 = FakeActivatable()
		val child2 = FakeActivatable()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		underTest.addChild(child1)
		underTest.addChild(child2)
		runCurrent()

		assertThat(child1.isActive).isTrue()
		assertThat(child2.isActive).isTrue()

		job.cancel()
		runCurrent()
		assertThat(underTest.isActive).isFalse()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		underTest.activateIn(this)
		runCurrent()
		assertThat(underTest.isActive).isTrue()
		assertThat(child1.isActive).isTrue()
		assertThat(child2.isActive).isTrue()
		}

		@Test
		fun removeChild_beforeActive_neverActivatesChild() =
		testScope.runTest {
		val child1 = FakeActivatable()
		val child2 = FakeActivatable()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		assertThat(underTest.isActive).isFalse()
		underTest.addChild(child1)
		underTest.addChild(child2)
		assertThat(underTest.isActive).isFalse()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()
		}

		@Test
		fun removeChild_whileActive_cancelsChild() =
		testScope.runTest {
		val child1 = FakeActivatable()
		val child2 = FakeActivatable()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		assertThat(underTest.isActive).isFalse()
		underTest.addChild(child1)
		underTest.addChild(child2)
		assertThat(underTest.isActive).isFalse()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		underTest.activateIn(this)
		runCurrent()
		assertThat(underTest.isActive).isTrue()
		assertThat(child1.isActive).isTrue()
		assertThat(child2.isActive).isTrue()

		underTest.removeChild(child1)
		runCurrent()
		assertThat(underTest.isActive).isTrue()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isTrue()
		}

		@Test
		fun removeChild_afterCancellation_doesNotReactivateChildren() =
		testScope.runTest {
		val child1 = FakeActivatable()
		val child2 = FakeActivatable()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		assertThat(underTest.isActive).isFalse()
		underTest.addChild(child1)
		underTest.addChild(child2)
		assertThat(underTest.isActive).isFalse()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		val job = Job()
		underTest.activateIn(this, context = job)
		runCurrent()
		assertThat(underTest.isActive).isTrue()
		assertThat(child1.isActive).isTrue()
		assertThat(child2.isActive).isTrue()

		job.cancel()
		runCurrent()
		assertThat(underTest.isActive).isFalse()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isFalse()

		underTest.removeChild(child1)
		underTest.activateIn(this)
		runCurrent()
		assertThat(underTest.isActive).isTrue()
		assertThat(child1.isActive).isFalse()
		assertThat(child2.isActive).isTrue()
		}
		}

packages/SystemUI/src/com/android/systemui/lifecycle/SafeActivatable.kt→packages/SystemUI/src/com/android/systemui/lifecycle/BaseActivatable.kt

+115 −0

Original line number	Diff line number	Diff line
		@@ -17,14 +17,24 @@
		package com.android.systemui.lifecycle

		import java.util.concurrent.atomic.AtomicBoolean
		import kotlinx.coroutines.Job
		import kotlinx.coroutines.awaitCancellation
		import kotlinx.coroutines.channels.Channel
		import kotlinx.coroutines.coroutineScope
		import kotlinx.coroutines.flow.receiveAsFlow
		import kotlinx.coroutines.launch

		/**
		* An [Activatable] that can be concurrently activated by no more than one owner.
		*
		* A previous call to [activate] must be canceled before a new call to [activate] can be made.
		* Trying to call [activate] while already active will fail with an error.
		* A base [Activatable] with the following characteristics:
		* 1. Can be concurrently activated by no more than one owner. A previous call to [activate]
		* must be canceled before a new call to [activate] can be made. Trying to call [activate] while
		* already active will fail with an error
		* 2. Can manage child [Activatable]s. See [addChild] and [removeChild]. Added children
		* automatically track the activation state of the parent such that when the parent is active,
		* the children are active and vice-versa. Children are also retained such that deactivating the
		* parent and reactivating it also cancels and reactivates the children.
		*/
		abstract class SafeActivatable : Activatable {
		abstract class BaseActivatable : Activatable {

		private val _isActive = AtomicBoolean(false)

		@@ -38,12 +48,15 @@ abstract class SafeActivatable : Activatable {
		val allowed = _isActive.compareAndSet(false, true)
		check(allowed) { "Cannot activate an already active activatable!" }

		coroutineScope {
		try {
		launch { manageChildren() }
		onActivated()
		} finally {
		isActive = false
		}
		}
		}

		/**
		* Notifies that the [Activatable] has been activated.
		@@ -69,4 +82,34 @@ abstract class SafeActivatable : Activatable {
		* @see activate
		*/
		protected abstract suspend fun onActivated(): Nothing

		private val newChildren = Channel<Activatable>(Channel.BUFFERED)
		private val jobByChild: MutableMap<Activatable, Job> by lazy { mutableMapOf() }

		private suspend fun manageChildren(): Nothing {
		coroutineScope {
		// Reactivate children that were added during a previous activation:
		jobByChild.keys.forEach { child -> jobByChild[child] = launch { child.activate() } }

		// Process requests to add more children:
		newChildren.receiveAsFlow().collect { newChild ->
		removeChildInternal(newChild)
		jobByChild[newChild] = launch { newChild.activate() }
		}

		awaitCancellation()
		}
		}

		fun addChild(child: Activatable) {
		newChildren.trySend(child)
		}

		fun removeChild(child: Activatable) {
		removeChildInternal(child)
		}

		private fun removeChildInternal(child: Activatable) {
		jobByChild.remove(child)?.cancel()
		}
		}

packages/SystemUI/src/com/android/systemui/lifecycle/SysUiViewModel.kt

+1 −1

Original line number	Diff line number	Diff line
		@@ -23,7 +23,7 @@ import kotlinx.coroutines.awaitCancellation
		import kotlinx.coroutines.launch

		/** Base class for all System UI view-models. */
		abstract class SysUiViewModel : SafeActivatable() {
		abstract class SysUiViewModel : BaseActivatable() {

		override suspend fun onActivated(): Nothing {
		awaitCancellation()

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

+2 −2

Original line number	Diff line number	Diff line
		@@ -19,7 +19,7 @@ package com.android.systemui.util.kotlin
		import android.util.IndentingPrintWriter
		import com.android.systemui.Dumpable
		import com.android.systemui.dump.DumpManager
		import com.android.systemui.lifecycle.SafeActivatable
		import com.android.systemui.lifecycle.BaseActivatable
		import com.android.systemui.lifecycle.SysUiViewModel
		import com.android.systemui.util.asIndenting
		import com.android.systemui.util.printCollection
		@@ -189,7 +189,7 @@ class ActivatableFlowDumperImpl(
		) : SimpleFlowDumper(), ActivatableFlowDumper {

		private val registration =
		object : SafeActivatable() {
		object : BaseActivatable() {
		override suspend fun onActivated(): Nothing {
		try {
		dumpManager.registerCriticalDumpable(

packages/SystemUI/tests/utils/src/com/android/systemui/lifecycle/FakeActivatable.kt

+1 −1

Original line number	Diff line number	Diff line
		@@ -21,7 +21,7 @@ import kotlinx.coroutines.awaitCancellation
		class FakeActivatable(
		private val onActivation: () -> Unit = {},
		private val onDeactivation: () -> Unit = {},
		) : SafeActivatable() {
		) : BaseActivatable() {
		var activationCount = 0
		var cancellationCount = 0