Add SynchronousStateUpdate event

Summary: Adding a DebugEvent for Sync State Updates

Reviewed By: adityasharat

Differential Revision: D44429123

fbshipit-source-id: 1a23df0b9847770df5d99699e23cca8d30bb3c15

Author: Fabio Carballo

litho-core/src/main/java/com/facebook/litho/ComponentTree.java

@@ -70,11 +70,13 @@
 import com.facebook.litho.config.ComponentsConfiguration;
 import com.facebook.litho.config.ResolveCancellationStrategy;
 import com.facebook.litho.debug.LithoDebugEvent;
+import com.facebook.litho.debug.LithoDebugEventAttributes;
 import com.facebook.litho.perfboost.LithoPerfBooster;
 import com.facebook.litho.stats.LithoStats;
 import com.facebook.rendercore.RunnableHandler;
 import com.facebook.rendercore.RunnableHandler.DefaultHandler;
 import com.facebook.rendercore.debug.DebugEventAttribute;
+import com.facebook.rendercore.debug.DebugEventBus;
 import com.facebook.rendercore.debug.DebugEventDispatcher;
 import com.facebook.rendercore.visibility.VisibilityBoundsTransformer;
 import java.lang.ref.WeakReference;
@@ -1432,6 +1434,8 @@ public final void updateHookStateAsync(
   }
 
   private void onAsyncStateUpdateEnqueued(String attribution, boolean isCreateLayoutInProgress) {
+    dispatchStateUpdateEnqueuedEvent(attribution, false);
+
     if (mBatchedStateUpdatesStrategy == null
         || !mBatchedStateUpdatesStrategy.onAsyncStateUpdateEnqueued(
             attribution, isCreateLayoutInProgress)) {
@@ -1472,6 +1476,8 @@ private void ensureSyncStateUpdateRunnable(String attribution, boolean isCreateL
       sSyncStateUpdatesHandler.set(new WeakReference<>(handler));
     }
 
+    dispatchStateUpdateEnqueuedEvent(attribution, true);
+
     synchronized (mUpdateStateSyncRunnableLock) {
       if (mUpdateStateSyncRunnable != null) {
         handler.remove(mUpdateStateSyncRunnable);
@@ -1486,6 +1492,21 @@ private void ensureSyncStateUpdateRunnable(String attribution, boolean isCreateL
     }
   }
 
+  private void dispatchStateUpdateEnqueuedEvent(String attribution, boolean isSynchronous) {
+    if (DebugEventBus.getEnabled()) {
+      DebugEventDispatcher.dispatch(
+          LithoDebugEvent.StateUpdateEnqueued,
+          String.valueOf(mId),
+          () -> {
+            HashMap<String, Object> map = new HashMap<>();
+            map.put(LithoDebugEventAttributes.Root, mRoot != null ? mRoot.getSimpleName() : "");
+            map.put(LithoDebugEventAttributes.Attribution, attribution);
+            map.put(LithoDebugEventAttributes.StateUpdateType, isSynchronous ? "sync" : "async");
+            return map;
+          });
+    }
+  }
+
   void updateStateInternal(boolean isAsync, String attribution, boolean isCreateLayoutInProgress) {
     final @Nullable TreeProps rootTreeProps;
 

litho-core/src/main/java/com/facebook/litho/debug/LithoDebugEvent.kt

@@ -22,12 +22,15 @@ object LithoDebugEvent {
   val RenderCore: DebugEvent.Companion = DebugEvent
   const val LayoutCommitted = "Litho.LayoutCommitted"
   const val LayoutCalculated = "Litho.LayoutCalculated"
-  const val MeasureSizeSpecsMismatch = "SizeSpecsMismatch"
+  const val MeasureSizeSpecsMismatch = "Litho.SizeSpecsMismatch"
+  const val StateUpdateEnqueued = "Litho.StateUpdateEnqueued"
 }
 
 object LithoDebugEventAttributes {
 
   const val Root = "root"
+  const val Attribution = "attribution"
+  const val StateUpdateType = "state_update_type"
   const val MainThreadLayoutStateWidthSpec = "main_thread_layout_state_width_spec"
   const val MainThreadLayoutStateHeightSpec = "main_thread_layout_state_height_spec"
   const val MeasureWidthSpec = "measure_width_spec"