Extract SynchronousMountItem (#53936)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/53936

Align with other mount items and make it easier to identify in memory traces.

Changelog: [Internal]

Reviewed By: lenaic

Differential Revision: D83241794

fbshipit-source-id: 9df1523e265e560c15f93bad8cd91a651bc5a4e2

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/FabricUIManager.java

@@ -66,6 +66,7 @@ import com.facebook.react.fabric.mounting.mountitems.DispatchCommandMountItem;
 import com.facebook.react.fabric.mounting.mountitems.MountItem;
 import com.facebook.react.fabric.mounting.mountitems.MountItemFactory;
 import com.facebook.react.fabric.mounting.mountitems.PrefetchResourcesMountItem;
+import com.facebook.react.fabric.mounting.mountitems.SynchronousMountItem;
 import com.facebook.react.internal.featureflags.ReactNativeFeatureFlags;
 import com.facebook.react.internal.featureflags.ReactNativeNewArchitectureFeatureFlags;
 import com.facebook.react.internal.interop.InteropEventEmitter;
@@ -178,7 +179,7 @@ public class FabricUIManager
 
   private final BatchEventDispatchedListener mBatchEventDispatchedListener;
 
-  private final CopyOnWriteArrayList<UIManagerListener> mListeners = new CopyOnWriteArrayList<>();
+  private final List<UIManagerListener> mListeners = new CopyOnWriteArrayList<>();
 
   private boolean mMountNotificationScheduled = false;
   private List<Integer> mSurfaceIdsWithPendingMountNotification = new ArrayList<>();
@@ -791,35 +792,7 @@ public class FabricUIManager
     //    android.view.View.updateDisplayListIfDirty(View.java:20466)
     // 3. A view is deleted while its parent is being drawn, causing a crash.
 
-    MountItem synchronousMountItem =
-        new MountItem() {
-          @Override
-          public void execute(MountingManager mountingManager) {
-            try {
-              mountingManager.storeSynchronousMountPropsOverride(reactTag, props);
-              mountingManager.updatePropsSynchronously(reactTag, props);
-            } catch (Exception ex) {
-              // TODO T42943890: Fix animations in Fabric and remove this try/catch?
-              // There might always be race conditions between surface teardown and
-              // animations/other operations, so it may not be feasible to remove this.
-              // Practically 100% of reported errors from this point are because the
-              // surface has stopped by this point, but the MountItem was queued before
-              // the surface was stopped. It's likely not feasible to prevent all such races.
-            }
-          }
-
-          @Override
-          public int getSurfaceId() {
-            return View.NO_ID;
-          }
-
-          @Override
-          public String toString() {
-            String propsString =
-                IS_DEVELOPMENT_ENVIRONMENT ? props.toHashMap().toString() : "<hidden>";
-            return String.format("SYNC UPDATE PROPS [%d]: %s", reactTag, propsString);
-          }
-        };
+    MountItem synchronousMountItem = new SynchronousMountItem(reactTag, props);
 
     // If the reactTag exists, we assume that it might at the end of the next
     // batch of MountItems. Otherwise, we try to execute immediately.
@@ -1399,24 +1372,21 @@ public class FabricUIManager
         // delay paint.
         UiThreadUtil.getUiThreadHandler()
             .postAtFrontOfQueue(
-                new Runnable() {
-                  @Override
-                  public void run() {
-                    mMountNotificationScheduled = false;
+                () -> {
+                  mMountNotificationScheduled = false;
 
-                    // Create a copy in case mount hooks trigger more mutations
-                    final List<Integer> surfaceIdsToReportMount =
-                        mSurfaceIdsWithPendingMountNotification;
-                    mSurfaceIdsWithPendingMountNotification = new ArrayList<>();
+                  // Create a copy in case mount hooks trigger more mutations
+                  final List<Integer> surfaceIdsToReportMount =
+                      mSurfaceIdsWithPendingMountNotification;
+                  mSurfaceIdsWithPendingMountNotification = new ArrayList<>();
 
-                    final @Nullable FabricUIManagerBinding binding = mBinding;
-                    if (binding == null || mDestroyed) {
-                      return;
-                    }
+                  final @Nullable FabricUIManagerBinding binding = mBinding;
+                  if (binding == null || mDestroyed) {
+                    return;
+                  }
 
-                    for (int surfaceId : surfaceIdsToReportMount) {
-                      binding.reportMount(surfaceId);
-                    }
+                  for (int surfaceId : surfaceIdsToReportMount) {
+                    binding.reportMount(surfaceId);
                   }
                 });
       }

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/MountingManager.kt

@@ -51,7 +51,7 @@ internal class MountingManager(
   private val rootViewManager = RootViewManager()
 
   internal fun interface MountItemExecutor {
-    @UiThread @ThreadConfined(ThreadConfined.UI) fun executeItems(items: Queue<MountItem?>?)
+    @UiThread @ThreadConfined(ThreadConfined.UI) fun executeItems(items: Queue<MountItem>)
   }
 
   /**

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/mountitems/DestroyUnmountedViewMountItem.kt

@@ -14,14 +14,14 @@ import com.facebook.react.fabric.mounting.MountingManager
  * for views that were preallcated but never mounted on the screen.
  */
 internal class DestroyUnmountedViewMountItem(
-    private val _surfaceId: Int,
+    private val surfaceId: Int,
     private val reactTag: Int,
 ) : MountItem {
 
   override fun execute(mountingManager: MountingManager) {
-    val surfaceMountingManager = mountingManager.getSurfaceManager(_surfaceId) ?: return
+    val surfaceMountingManager = mountingManager.getSurfaceManager(surfaceId) ?: return
     surfaceMountingManager.deleteView(reactTag)
   }
 
-  override fun getSurfaceId(): Int = _surfaceId
+  override fun getSurfaceId(): Int = surfaceId
 }

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/mountitems/IntBufferBatchMountItem.kt

@@ -8,7 +8,6 @@
 package com.facebook.react.fabric.mounting.mountitems
 
 import com.facebook.common.logging.FLog
-import com.facebook.proguard.annotations.DoNotStripAny
 import com.facebook.react.bridge.ReactMarker
 import com.facebook.react.bridge.ReactMarkerConstants
 import com.facebook.react.bridge.ReadableMap
@@ -31,7 +30,8 @@ import java.util.Locale
  * The purpose of encapsulating the array of MountItems this way, is to reduce the amount of
  * allocations in C++ and JNI round-trips.
  */
-@DoNotStripAny
+private const val TAG = "IntBufferBatchMountItem"
+
 internal class IntBufferBatchMountItem(
     private val surfaceId: Int,
     private val intBuffer: IntArray,
@@ -341,8 +341,6 @@ internal class IntBufferBatchMountItem(
   }
 
   companion object {
-    val TAG: String = IntBufferBatchMountItem::class.java.simpleName
-
     const val INSTRUCTION_FLAG_MULTIPLE: Int = 1
 
     const val INSTRUCTION_CREATE: Int = 2

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/mountitems/SendAccessibilityEventMountItem.kt

@@ -12,17 +12,17 @@ import com.facebook.react.bridge.ReactSoftExceptionLogger
 import com.facebook.react.bridge.RetryableMountingLayerException
 import com.facebook.react.fabric.mounting.MountingManager
 
+private const val TAG = "SendAccessibilityEventMountItem"
+
 internal class SendAccessibilityEventMountItem(
-    private val _surfaceId: Int,
+    private val surfaceId: Int,
     private val reactTag: Int,
     private val eventType: Int,
 ) : MountItem {
 
-  private val TAG = "Fabric.SendAccessibilityEvent"
-
   override fun execute(mountingManager: MountingManager) {
     try {
-      mountingManager.sendAccessibilityEvent(_surfaceId, reactTag, eventType)
+      mountingManager.sendAccessibilityEvent(surfaceId, reactTag, eventType)
     } catch (e: RetryableMountingLayerException) {
       // Accessibility events are similar to commands in that they're imperative
       // calls from JS, disconnected from the commit lifecycle, and therefore
@@ -35,7 +35,7 @@ internal class SendAccessibilityEventMountItem(
     }
   }
 
-  override fun getSurfaceId(): Int = _surfaceId
+  override fun getSurfaceId(): Int = surfaceId
 
-  override fun toString(): String = "SendAccessibilityEventMountItem [$reactTag] $eventType"
+  override fun toString(): String = "$TAG [$reactTag] $eventType"
 }

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/mountitems/SynchronousMountItem.kt

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.fabric.mounting.mountitems
+
+import android.view.View
+import com.facebook.react.bridge.ReadableMap
+import com.facebook.react.fabric.FabricUIManager.IS_DEVELOPMENT_ENVIRONMENT
+import com.facebook.react.fabric.mounting.MountingManager
+
+internal class SynchronousMountItem(private val reactTag: Int, private val props: ReadableMap) :
+    MountItem {
+
+  override fun execute(mountingManager: MountingManager) {
+    try {
+      mountingManager.storeSynchronousMountPropsOverride(reactTag, props)
+      mountingManager.updatePropsSynchronously(reactTag, props)
+    } catch (ex: Exception) {
+      // TODO T42943890: Fix animations in Fabric and remove this try/catch?
+      // There might always be race conditions between surface teardown and
+      // animations/other operations, so it may not be feasible to remove this.
+      // Practically 100% of reported errors from this point are because the
+      // surface has stopped by this point, but the MountItem was queued before
+      // the surface was stopped. It's likely not feasible to prevent all such races.
+    }
+  }
+
+  override fun toString(): String {
+    val propsString = if (IS_DEVELOPMENT_ENVIRONMENT) props.toHashMap().toString() else "<hidden>"
+    return "SYNC UPDATE PROPS [$reactTag]: $propsString"
+  }
+
+  override fun getSurfaceId(): Int = View.NO_ID
+}