Complete conversion of modules.debug module (#44476)

Summary:
Pull Request resolved: #44476

# Changelog:
[Internal] -

This is the last step to converting the whole `modules.debug` module to Kotlin.

Reviewed By: christophpurrer

Differential Revision: D57095966

fbshipit-source-id: 3fcb52528674565a4a2b5c306262e0af11a19e6e

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -3223,9 +3223,8 @@ public final class com/facebook/react/modules/debug/FpsDebugFrameCallback$FpsInf
 	public final fun getTotalTimeMs ()I
 }
 
-public class com/facebook/react/modules/debug/SourceCodeModule : com/facebook/fbreact/specs/NativeSourceCodeSpec {
+public final class com/facebook/react/modules/debug/SourceCodeModule : com/facebook/fbreact/specs/NativeSourceCodeSpec {
 	public fun <init> (Lcom/facebook/react/bridge/ReactApplicationContext;)V
-	protected fun getTypedExportedConstants ()Ljava/util/Map;
 }
 
 public abstract interface class com/facebook/react/modules/debug/interfaces/DeveloperSettings {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/modules/debug/DidJSUpdateUiDuringFrameDetector.kt

@@ -0,0 +1,158 @@
+/*
+ * 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.modules.debug
+
+import com.facebook.react.bridge.NotThreadSafeBridgeIdleDebugListener
+import com.facebook.react.common.LongArray
+import com.facebook.react.uimanager.debug.NotThreadSafeViewHierarchyUpdateDebugListener
+
+/**
+ * Debug object that listens to bridge busy/idle events and UiManagerModule dispatches and uses it
+ * to calculate whether JS was able to update the UI during a given frame. After being installed on
+ * a [ReactBridge] and a [UIManagerModule], [.getDidJSHitFrameAndCleanup] should be called once per
+ * frame via a [Choreographer.FrameCallback].
+ */
+internal class DidJSUpdateUiDuringFrameDetector :
+    NotThreadSafeBridgeIdleDebugListener, NotThreadSafeViewHierarchyUpdateDebugListener {
+  private val transitionToIdleEvents = LongArray.createWithInitialCapacity(20)
+  private val transitionToBusyEvents = LongArray.createWithInitialCapacity(20)
+  private val viewHierarchyUpdateEnqueuedEvents = LongArray.createWithInitialCapacity(20)
+  private val viewHierarchyUpdateFinishedEvents = LongArray.createWithInitialCapacity(20)
+  @Volatile private var wasIdleAtEndOfLastFrame = true
+
+  @Synchronized
+  override fun onTransitionToBridgeIdle() {
+    transitionToIdleEvents.add(System.nanoTime())
+  }
+
+  @Synchronized
+  override fun onTransitionToBridgeBusy() {
+    transitionToBusyEvents.add(System.nanoTime())
+  }
+
+  @Synchronized
+  override fun onBridgeDestroyed() {
+    // do nothing
+  }
+
+  @Synchronized
+  override fun onViewHierarchyUpdateEnqueued() {
+    viewHierarchyUpdateEnqueuedEvents.add(System.nanoTime())
+  }
+
+  @Synchronized
+  override fun onViewHierarchyUpdateFinished() {
+    viewHierarchyUpdateFinishedEvents.add(System.nanoTime())
+  }
+
+  /**
+   * Designed to be called from a [Choreographer.FrameCallback.doFrame] call.
+   *
+   * There are two 'success' cases that will cause [.getDidJSHitFrameAndCleanup] to return true for
+   * a given frame:
+   * 1. UIManagerModule finished dispatching a batched UI update on the UI thread during the frame.
+   *    This means that during the next hierarchy traversal, new UI will be drawn if needed (good).
+   * 1. The bridge ended the frame idle (meaning there were no JS nor native module calls still in
+   *    flight) AND there was no UiManagerModule update enqueued that didn't also finish. NB: if
+   *    there was one enqueued that actually finished, we'd have case 1), so effectively we just
+   *    look for whether one was enqueued.
+   *
+   * NB: This call can only be called once for a given frame time range because it cleans up events
+   * it recorded for that frame.
+   *
+   * NB2: This makes the assumption that onViewHierarchyUpdateEnqueued is called from the
+   * [ ][UIManagerModule.onBatchComplete], e.g. while the bridge is still considered busy, which
+   * means there is no race condition where the bridge has gone idle but a hierarchy update is
+   * waiting to be enqueued.
+   *
+   * @param frameStartTimeNanos the time in nanos that the last frame started
+   * @param frameEndTimeNanos the time in nanos that the last frame ended
+   */
+  @Synchronized
+  fun getDidJSHitFrameAndCleanup(frameStartTimeNanos: Long, frameEndTimeNanos: Long): Boolean {
+    // Case 1: We dispatched a UI update
+    val finishedUiUpdate =
+        hasEventBetweenTimestamps(
+            viewHierarchyUpdateFinishedEvents, frameStartTimeNanos, frameEndTimeNanos)
+    val didEndFrameIdle = didEndFrameIdle(frameStartTimeNanos, frameEndTimeNanos)
+    val hitFrame =
+        if (finishedUiUpdate) {
+          true
+        } else {
+          // Case 2: Ended idle but no UI was enqueued during that frame
+          (didEndFrameIdle &&
+              !hasEventBetweenTimestamps(
+                  viewHierarchyUpdateEnqueuedEvents, frameStartTimeNanos, frameEndTimeNanos))
+        }
+    cleanUp(transitionToIdleEvents, frameEndTimeNanos)
+    cleanUp(transitionToBusyEvents, frameEndTimeNanos)
+    cleanUp(viewHierarchyUpdateEnqueuedEvents, frameEndTimeNanos)
+    cleanUp(viewHierarchyUpdateFinishedEvents, frameEndTimeNanos)
+    wasIdleAtEndOfLastFrame = didEndFrameIdle
+    return hitFrame
+  }
+
+  private fun didEndFrameIdle(startTime: Long, endTime: Long): Boolean {
+    val lastIdleTransition =
+        getLastEventBetweenTimestamps(transitionToIdleEvents, startTime, endTime)
+    val lastBusyTransition =
+        getLastEventBetweenTimestamps(transitionToBusyEvents, startTime, endTime)
+    return if (lastIdleTransition == -1L && lastBusyTransition == -1L) {
+      wasIdleAtEndOfLastFrame
+    } else lastIdleTransition > lastBusyTransition
+  }
+
+  companion object {
+    private fun hasEventBetweenTimestamps(
+        eventArray: LongArray,
+        startTime: Long,
+        endTime: Long
+    ): Boolean {
+      for (i in 0 until eventArray.size()) {
+        val time = eventArray[i]
+        if (time in startTime until endTime) {
+          return true
+        }
+      }
+      return false
+    }
+
+    private fun getLastEventBetweenTimestamps(
+        eventArray: LongArray,
+        startTime: Long,
+        endTime: Long
+    ): Long {
+      var lastEvent: Long = -1
+      for (i in 0 until eventArray.size()) {
+        val time = eventArray[i]
+        if (time in startTime until endTime) {
+          lastEvent = time
+        } else if (time >= endTime) {
+          break
+        }
+      }
+      return lastEvent
+    }
+
+    private fun cleanUp(eventArray: LongArray, endTime: Long) {
+      val size = eventArray.size()
+      var indicesToRemove = 0
+      for (i in 0 until size) {
+        if (eventArray[i] < endTime) {
+          indicesToRemove++
+        }
+      }
+      if (indicesToRemove > 0) {
+        for (i in 0 until size - indicesToRemove) {
+          eventArray[i] = eventArray[i + indicesToRemove]
+        }
+        eventArray.dropTail(indicesToRemove)
+      }
+    }
+  }
+}