Reland "Remove MessageQueue reflection from TestLooper" (897b1767) · Commits · e / os / android_frameworks_base

tests/utils/testutils/java/android/os/test/TestLooper.java

+146 −22

Original line number	Diff line number	Diff line
		@@ -18,18 +18,24 @@ package android.os.test;

		import static org.junit.Assert.assertTrue;

		import android.os.Build;
		import android.os.Handler;
		import android.os.HandlerExecutor;
		import android.os.Looper;
		import android.os.Message;
		import android.os.MessageQueue;
		import android.os.SystemClock;
		import android.os.TestLooperManager;
		import android.util.Log;

		import androidx.test.platform.app.InstrumentationRegistry;

		import java.lang.reflect.Constructor;
		import java.lang.reflect.Field;
		import java.lang.reflect.InvocationTargetException;
		import java.lang.reflect.Method;
		import java.util.ArrayDeque;
		import java.util.Queue;
		import java.util.concurrent.Executor;

		/**
		@@ -44,7 +50,9 @@ import java.util.concurrent.Executor;
		* The Robolectric class also allows advancing time.
		*/
		public class TestLooper {
		protected final Looper mLooper;
		private final Looper mLooper;
		private final TestLooperManager mTestLooperManager;
		private final Clock mClock;

		private static final Constructor<Looper> LOOPER_CONSTRUCTOR;
		private static final Field THREAD_LOCAL_LOOPER_FIELD;
		@@ -54,16 +62,37 @@ public class TestLooper {
		private static final Method MESSAGE_MARK_IN_USE_METHOD;
		private static final String TAG = "TestLooper";

		private final Clock mClock;

		private AutoDispatchThread mAutoDispatchThread;

		/**
		* Baklava introduces new {@link TestLooperManager} APIs that we can use instead of reflection.
		*/
		private static boolean isAtLeastBaklava() {
		Method[] methods = TestLooperManager.class.getMethods();
		for (Method method : methods) {
		if (method.getName().equals("peekWhen")) {
		return true;
		}
		}
		return false;
		// TODO(shayba): delete the above, uncomment the below.
		// SDK_INT has not yet ramped to Baklava in all 25Q2 builds.
		// return Build.VERSION.SDK_INT >= Build.VERSION_CODES.BAKLAVA;
		}

		static {
		try {
		LOOPER_CONSTRUCTOR = Looper.class.getDeclaredConstructor(Boolean.TYPE);
		LOOPER_CONSTRUCTOR.setAccessible(true);
		THREAD_LOCAL_LOOPER_FIELD = Looper.class.getDeclaredField("sThreadLocal");
		THREAD_LOCAL_LOOPER_FIELD.setAccessible(true);

		if (isAtLeastBaklava()) {
		MESSAGE_QUEUE_MESSAGES_FIELD = null;
		MESSAGE_NEXT_FIELD = null;
		MESSAGE_WHEN_FIELD = null;
		MESSAGE_MARK_IN_USE_METHOD = null;
		} else {
		MESSAGE_QUEUE_MESSAGES_FIELD = MessageQueue.class.getDeclaredField("mMessages");
		MESSAGE_QUEUE_MESSAGES_FIELD.setAccessible(true);
		MESSAGE_NEXT_FIELD = Message.class.getDeclaredField("next");
		@@ -72,6 +101,7 @@ public class TestLooper {
		MESSAGE_WHEN_FIELD.setAccessible(true);
		MESSAGE_MARK_IN_USE_METHOD = Message.class.getDeclaredMethod("markInUse");
		MESSAGE_MARK_IN_USE_METHOD.setAccessible(true);
		}
		} catch (NoSuchFieldException \| NoSuchMethodException e) {
		throw new RuntimeException("Failed to initialize TestLooper", e);
		}
		@@ -106,6 +136,13 @@ public class TestLooper {
		throw new RuntimeException("Reflection error constructing or accessing looper", e);
		}

		if (isAtLeastBaklava()) {
		mTestLooperManager =
		InstrumentationRegistry.getInstrumentation().acquireLooperManager(mLooper);
		} else {
		mTestLooperManager = null;
		}

		mClock = clock;
		}

		@@ -117,7 +154,7 @@ public class TestLooper {
		return new HandlerExecutor(new Handler(getLooper()));
		}

		private Message getMessageLinkedList() {
		private Message getMessageLinkedListLegacy() {
		try {
		MessageQueue queue = mLooper.getQueue();
		return (Message) MESSAGE_QUEUE_MESSAGES_FIELD.get(queue);
		@@ -128,8 +165,50 @@ public class TestLooper {
		}

		public void moveTimeForward(long milliSeconds) {
		if (isAtLeastBaklava()) {
		moveTimeForwardBaklava(milliSeconds);
		} else {
		moveTimeForwardLegacy(milliSeconds);
		}
		}

		private void moveTimeForwardBaklava(long milliSeconds) {
		// Drain all Messages from the queue.
		Queue<Message> messages = new ArrayDeque<>();
		while (true) {
		Message message = mTestLooperManager.poll();
		if (message == null) {
		break;
		}
		messages.add(message);
		}

		// Repost all Messages back to the queue with a new time.
		while (true) {
		Message message = messages.poll();
		if (message == null) {
		break;
		}

		// Ugly trick to reset the Message's "in use" flag.
		// This is needed because the Message cannot be re-enqueued if it's
		// marked in use.
		message.copyFrom(message);

		// Adjust the Message's delivery time.
		long newWhen = message.getWhen() - milliSeconds;
		if (newWhen < 0) {
		newWhen = 0;
		}

		// Send the Message back to its Handler to be re-enqueued.
		message.getTarget().sendMessageAtTime(message, newWhen);
		}
		}

		private void moveTimeForwardLegacy(long milliSeconds) {
		try {
		Message msg = getMessageLinkedList();
		Message msg = getMessageLinkedListLegacy();
		while (msg != null) {
		long updatedWhen = msg.getWhen() - milliSeconds;
		if (updatedWhen < 0) {
		@@ -147,12 +226,12 @@ public class TestLooper {
		return mClock.uptimeMillis();
		}

		private Message messageQueueNext() {
		private Message messageQueueNextLegacy() {
		try {
		long now = currentTime();

		Message prevMsg = null;
		Message msg = getMessageLinkedList();
		Message msg = getMessageLinkedListLegacy();
		if (msg != null && msg.getTarget() == null) {
		// Stalled by a barrier. Find the next asynchronous message in
		// the queue.
		@@ -185,18 +264,46 @@ public class TestLooper {
		/**
		* @return true if there are pending messages in the message queue
		*/
		public synchronized boolean isIdle() {
		Message messageList = getMessageLinkedList();
		public boolean isIdle() {
		if (isAtLeastBaklava()) {
		return isIdleBaklava();
		} else {
		return isIdleLegacy();
		}
		}

		private boolean isIdleBaklava() {
		Long when = mTestLooperManager.peekWhen();
		return when != null && currentTime() >= when;
		}

		private synchronized boolean isIdleLegacy() {
		Message messageList = getMessageLinkedListLegacy();
		return messageList != null && currentTime() >= messageList.getWhen();
		}

		/**
		* @return the next message in the Looper's message queue or null if there is none
		*/
		public synchronized Message nextMessage() {
		public Message nextMessage() {
		if (isAtLeastBaklava()) {
		return nextMessageBaklava();
		} else {
		return nextMessageLegacy();
		}
		}

		private Message nextMessageBaklava() {
		if (isIdle()) {
		return mTestLooperManager.poll();
		} else {
		return null;
		}
		}

		private synchronized Message nextMessageLegacy() {
		if (isIdle()) {
		return messageQueueNext();
		return messageQueueNextLegacy();
		} else {
		return null;
		}
		@@ -206,9 +313,26 @@ public class TestLooper {
		* Dispatch the next message in the queue
		* Asserts that there is a message in the queue
		*/
		public synchronized void dispatchNext() {
		public void dispatchNext() {
		if (isAtLeastBaklava()) {
		dispatchNextBaklava();
		} else {
		dispatchNextLegacy();
		}
		}

		private void dispatchNextBaklava() {
		assertTrue(isIdle());
		Message msg = mTestLooperManager.poll();
		if (msg == null) {
		return;
		}
		msg.getTarget().dispatchMessage(msg);
		}

		private synchronized void dispatchNextLegacy() {
		assertTrue(isIdle());
		Message msg = messageQueueNext();
		Message msg = messageQueueNextLegacy();
		if (msg == null) {
		return;
		}