Merge "fix(magnifier): fix deadlock when feature flag changes" into udc-dev

services/accessibility/java/com/android/server/accessibility/AccessibilityManagerService.java

@@ -179,6 +179,7 @@ import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.Executors;
 import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Predicate;
@@ -494,8 +495,13 @@ public class AccessibilityManagerService extends IAccessibilityManager.Stub
         mA11yWindowManager = new AccessibilityWindowManager(mLock, mMainHandler,
                 mWindowManagerService, this, mSecurityPolicy, this, mTraceManager);
         mA11yDisplayListener = new AccessibilityDisplayListener(mContext, mMainHandler);
-        mMagnificationController = new MagnificationController(this, mLock, mContext,
-                new MagnificationScaleProvider(mContext));
+        mMagnificationController = new MagnificationController(
+                this,
+                mLock,
+                mContext,
+                new MagnificationScaleProvider(mContext),
+                Executors.newSingleThreadExecutor()
+        );
         mMagnificationProcessor = new MagnificationProcessor(mMagnificationController);
         mCaptioningManagerImpl = new CaptioningManagerImpl(mContext);
         mProxyManager = new ProxyManager(mLock, mA11yWindowManager, mContext, mMainHandler,

services/accessibility/java/com/android/server/accessibility/magnification/FullScreenMagnificationController.java

@@ -56,7 +56,6 @@ import com.android.internal.R;
 import com.android.internal.accessibility.common.MagnificationConstants;
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.util.ConcurrentUtils;
 import com.android.internal.util.function.pooled.PooledLambda;
 import com.android.server.LocalServices;
 import com.android.server.accessibility.AccessibilityManagerService;
@@ -65,6 +64,7 @@ import com.android.server.wm.WindowManagerInternal;
 
 import java.util.ArrayList;
 import java.util.Locale;
+import java.util.concurrent.Executor;
 import java.util.function.Supplier;
 
 /**
@@ -774,7 +774,8 @@ public class FullScreenMagnificationController implements
     public FullScreenMagnificationController(@NonNull Context context,
             @NonNull AccessibilityTraceManager traceManager, @NonNull Object lock,
             @NonNull MagnificationInfoChangedCallback magnificationInfoChangedCallback,
-            @NonNull MagnificationScaleProvider scaleProvider) {
+            @NonNull MagnificationScaleProvider scaleProvider,
+            @NonNull Executor backgroundExecutor) {
         this(
                 new ControllerContext(
                         context,
@@ -785,7 +786,8 @@ public class FullScreenMagnificationController implements
                 lock,
                 magnificationInfoChangedCallback,
                 scaleProvider,
-                /* thumbnailSupplier= */ null);
+                /* thumbnailSupplier= */ null,
+                backgroundExecutor);
     }
 
     /** Constructor for tests */
@@ -795,7 +797,8 @@ public class FullScreenMagnificationController implements
             @NonNull Object lock,
             @NonNull MagnificationInfoChangedCallback magnificationInfoChangedCallback,
             @NonNull MagnificationScaleProvider scaleProvider,
-            Supplier<MagnificationThumbnail> thumbnailSupplier) {
+            Supplier<MagnificationThumbnail> thumbnailSupplier,
+            @NonNull Executor backgroundExecutor) {
         mControllerCtx = ctx;
         mLock = lock;
         mMainThreadId = mControllerCtx.getContext().getMainLooper().getThread().getId();
@@ -805,7 +808,7 @@ public class FullScreenMagnificationController implements
         mDisplayManagerInternal = LocalServices.getService(DisplayManagerInternal.class);
         mMagnificationThumbnailFeatureFlag = new MagnificationThumbnailFeatureFlag();
         mMagnificationThumbnailFeatureFlag.addOnChangedListener(
-                ConcurrentUtils.DIRECT_EXECUTOR, this::onMagnificationThumbnailFeatureFlagChanged);
+                backgroundExecutor, this::onMagnificationThumbnailFeatureFlagChanged);
         if (thumbnailSupplier != null) {
             mThumbnailSupplier = thumbnailSupplier;
         } else {

services/accessibility/java/com/android/server/accessibility/magnification/MagnificationController.java

@@ -23,7 +23,6 @@ import static android.provider.Settings.Secure.ACCESSIBILITY_MAGNIFICATION_MODE_
 import static android.provider.Settings.Secure.ACCESSIBILITY_MAGNIFICATION_MODE_FULLSCREEN;
 import static android.provider.Settings.Secure.ACCESSIBILITY_MAGNIFICATION_MODE_NONE;
 import static android.provider.Settings.Secure.ACCESSIBILITY_MAGNIFICATION_MODE_WINDOW;
-import static android.view.accessibility.MagnificationAnimationCallback.STUB_ANIMATION_CALLBACK;
 
 import static com.android.server.accessibility.AccessibilityManagerService.MAGNIFICATION_GESTURE_HANDLER_ID;
 
@@ -48,11 +47,12 @@ import android.view.accessibility.MagnificationAnimationCallback;
 import com.android.internal.accessibility.util.AccessibilityStatsLogUtils;
 import com.android.internal.annotations.GuardedBy;
 import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.util.ConcurrentUtils;
 import com.android.server.LocalServices;
 import com.android.server.accessibility.AccessibilityManagerService;
 import com.android.server.wm.WindowManagerInternal;
 
+import java.util.concurrent.Executor;
+
 /**
  * Handles all magnification controllers initialization, generic interactions,
  * magnification mode transition and magnification switch UI show/hide logic
@@ -101,6 +101,8 @@ public class MagnificationController implements WindowMagnificationManager.Callb
     /** Whether the platform supports window magnification feature. */
     private final boolean mSupportWindowMagnification;
 
+    private final Executor mBackgroundExecutor;
+
     @GuardedBy("mLock")
     private final SparseIntArray mCurrentMagnificationModeArray = new SparseIntArray();
     @GuardedBy("mLock")
@@ -142,11 +144,13 @@ public class MagnificationController implements WindowMagnificationManager.Callb
     }
 
     public MagnificationController(AccessibilityManagerService ams, Object lock,
-            Context context, MagnificationScaleProvider scaleProvider) {
+            Context context, MagnificationScaleProvider scaleProvider,
+            Executor backgroundExecutor) {
         mAms = ams;
         mLock = lock;
         mContext = context;
         mScaleProvider = scaleProvider;
+        mBackgroundExecutor = backgroundExecutor;
         LocalServices.getService(WindowManagerInternal.class)
                 .getAccessibilityController().setUiChangesForAccessibilityCallbacks(this);
         mSupportWindowMagnification = context.getPackageManager().hasSystemFeature(
@@ -154,15 +158,15 @@ public class MagnificationController implements WindowMagnificationManager.Callb
 
         mAlwaysOnMagnificationFeatureFlag = new AlwaysOnMagnificationFeatureFlag();
         mAlwaysOnMagnificationFeatureFlag.addOnChangedListener(
-                ConcurrentUtils.DIRECT_EXECUTOR, mAms::updateAlwaysOnMagnification);
+                mBackgroundExecutor, mAms::updateAlwaysOnMagnification);
     }
 
     @VisibleForTesting
     public MagnificationController(AccessibilityManagerService ams, Object lock,
             Context context, FullScreenMagnificationController fullScreenMagnificationController,
             WindowMagnificationManager windowMagnificationManager,
-            MagnificationScaleProvider scaleProvider) {
-        this(ams, lock, context, scaleProvider);
+            MagnificationScaleProvider scaleProvider, Executor backgroundExecutor) {
+        this(ams, lock, context, scaleProvider, backgroundExecutor);
         mFullScreenMagnificationController = fullScreenMagnificationController;
         mWindowMagnificationMgr = windowMagnificationManager;
     }
@@ -765,8 +769,14 @@ public class MagnificationController implements WindowMagnificationManager.Callb
     public FullScreenMagnificationController getFullScreenMagnificationController() {
         synchronized (mLock) {
             if (mFullScreenMagnificationController == null) {
-                mFullScreenMagnificationController = new FullScreenMagnificationController(mContext,
-                        mAms.getTraceManager(), mLock, this, mScaleProvider);
+                mFullScreenMagnificationController = new FullScreenMagnificationController(
+                        mContext,
+                        mAms.getTraceManager(),
+                        mLock,
+                        this,
+                        mScaleProvider,
+                        mBackgroundExecutor
+                );
             }
         }
         return mFullScreenMagnificationController;

services/accessibility/java/com/android/server/accessibility/magnification/MagnificationFeatureFlagBase.java

@@ -80,6 +80,9 @@ abstract class MagnificationFeatureFlagBase {
      *
      * <p>{@see DeviceConfig#addOnPropertiesChangedListener(
      * String, Executor, DeviceConfig.OnPropertiesChangedListener)}
+     *
+     * <p>Note: be weary of using a DIRECT_EXECUTOR here. You may run into deadlocks! (see
+     * b/281132229)
      */
     @NonNull
     public DeviceConfig.OnPropertiesChangedListener addOnChangedListener(

services/tests/servicestests/src/com/android/server/accessibility/magnification/FullScreenMagnificationControllerTest.java

@@ -60,6 +60,7 @@ import android.view.accessibility.MagnificationAnimationCallback;
 import androidx.test.InstrumentationRegistry;
 import androidx.test.runner.AndroidJUnit4;
 
+import com.android.internal.util.ConcurrentUtils;
 import com.android.internal.util.test.FakeSettingsProvider;
 import com.android.server.LocalServices;
 import com.android.server.accessibility.AccessibilityTraceManager;
@@ -160,7 +161,8 @@ public class FullScreenMagnificationControllerTest {
                         new Object(),
                         mRequestObserver,
                         mScaleProvider,
-                        () -> mMockThumbnail);
+                        () -> mMockThumbnail,
+                        ConcurrentUtils.DIRECT_EXECUTOR);
     }
 
     @After

services/tests/servicestests/src/com/android/server/accessibility/magnification/FullScreenMagnificationGestureHandlerTest.java

@@ -54,6 +54,7 @@ import android.view.ViewConfiguration;
 
 import androidx.test.runner.AndroidJUnit4;
 
+import com.android.internal.util.ConcurrentUtils;
 import com.android.server.accessibility.AccessibilityManagerService;
 import com.android.server.accessibility.AccessibilityTraceManager;
 import com.android.server.accessibility.EventStreamTransformation;
@@ -170,8 +171,8 @@ public class FullScreenMagnificationGestureHandlerTest {
                 new Object(),
                 mMagnificationInfoChangedCallback,
                 new MagnificationScaleProvider(mContext),
-                () -> null
-        ) {
+                () -> null,
+                ConcurrentUtils.DIRECT_EXECUTOR) {
             @Override
             public boolean magnificationRegionContains(int displayId, float x, float y) {
                 return true;

services/tests/servicestests/src/com/android/server/accessibility/magnification/MagnificationControllerTest.java

@@ -64,6 +64,7 @@ import androidx.annotation.NonNull;
 import androidx.test.InstrumentationRegistry;
 import androidx.test.runner.AndroidJUnit4;
 
+import com.android.internal.util.ConcurrentUtils;
 import com.android.internal.util.test.FakeSettingsProvider;
 import com.android.server.LocalServices;
 import com.android.server.accessibility.AccessibilityManagerService;
@@ -199,7 +200,8 @@ public class MagnificationControllerTest {
                 new Object(),
                 mScreenMagnificationInfoChangedCallbackDelegate,
                 mScaleProvider,
-                () -> null
+                () -> null,
+                ConcurrentUtils.DIRECT_EXECUTOR
         ));
         mScreenMagnificationController.register(TEST_DISPLAY);
 
@@ -209,7 +211,8 @@ public class MagnificationControllerTest {
         mWindowMagnificationManager.setConnection(mMockConnection.getConnection());
 
         mMagnificationController = spy(new MagnificationController(mService, globalLock, mContext,
-                mScreenMagnificationController, mWindowMagnificationManager, mScaleProvider));
+                mScreenMagnificationController, mWindowMagnificationManager, mScaleProvider,
+                ConcurrentUtils.DIRECT_EXECUTOR));
         mMagnificationController.setMagnificationCapabilities(
                 Settings.Secure.ACCESSIBILITY_MAGNIFICATION_MODE_ALL);