Rollout bridgelessArchitectureMemoryPressureHackyBoltsFix (#43478)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/43478

This is rolled out internally already. Also exposing `memoryPressureRouter` to match the ReactInstanceManager interface.

Changelog: [Internal]

Reviewed By: sammy-SC

Differential Revision: D54802021

fbshipit-source-id: b74dcde71296d3925acfc2171d2a77d90960e15e

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

@@ -197,6 +197,7 @@ public abstract interface class com/facebook/react/ReactHost {
 	public abstract fun getDevSupportManager ()Lcom/facebook/react/devsupport/interfaces/DevSupportManager;
 	public abstract fun getJsEngineResolutionAlgorithm ()Lcom/facebook/react/JSEngineResolutionAlgorithm;
 	public abstract fun getLifecycleState ()Lcom/facebook/react/common/LifecycleState;
+	public abstract fun getMemoryPressureRouter ()Lcom/facebook/react/MemoryPressureRouter;
 	public abstract fun getReactQueueConfiguration ()Lcom/facebook/react/bridge/queue/ReactQueueConfiguration;
 	public abstract fun onActivityResult (Landroid/app/Activity;IILandroid/content/Intent;)V
 	public abstract fun onBackPressed ()Z
@@ -1922,7 +1923,6 @@ public class com/facebook/react/config/ReactFeatureFlags {
 	public static field excludeYogaFromRawProps Z
 	public static field rejectTurboModulePromiseOnNativeError Z
 	public static field traceTurboModulePromiseRejections Z
-	public static field unstable_bridgelessArchitectureMemoryPressureHackyBoltsFix Z
 	public static field unstable_enableTurboModuleSyncVoidMethods Z
 	public static field unstable_useFabricInterop Z
 	public static field unstable_useTurboModuleInterop Z

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/ReactHost.kt

@@ -48,6 +48,9 @@ public interface ReactHost {
   /** [JSEngineResolutionAlgorithm] used by this host. */
   public var jsEngineResolutionAlgorithm: JSEngineResolutionAlgorithm?
 
+  /** Routes memory pressure events to interested components */
+  public val memoryPressureRouter: MemoryPressureRouter
+
   /** To be called when back button is pressed */
   public fun onBackPressed(): Boolean
 

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java

@@ -66,9 +66,6 @@ public class ReactFeatureFlags {
    */
   public static boolean enableBridgelessArchitecture = false;
 
-  /** Server-side gating for a hacky fix to an ANR in the bridgeless core, related to Bolts task. */
-  public static boolean unstable_bridgelessArchitectureMemoryPressureHackyBoltsFix = false;
-
   /**
    * Does the bridgeless architecture log soft exceptions. Could be useful for tracking down issues.
    */

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/runtime/ReactHostImpl.java

@@ -135,7 +135,7 @@ public class ReactHostImpl implements ReactHost {
       new ReactLifecycleStateManager(mBridgelessReactStateTracker);
   private final int mId = mCounter.getAndIncrement();
   private @Nullable JSEngineResolutionAlgorithm mJSEngineResolutionAlgorithm = null;
-  private MemoryPressureListener mMemoryPressureListener;
+  private @Nullable MemoryPressureListener mMemoryPressureListener;
   private @Nullable DefaultHardwareBackBtnHandler mDefaultHardwareBackBtnHandler;
 
   private final Set<Function0<Unit>> mBeforeDestroyListeners =
@@ -178,11 +178,6 @@ public class ReactHostImpl implements ReactHost {
     mReactJsExceptionHandler = reactJsExceptionHandler;
     mQueueThreadExceptionHandler = ReactHostImpl.this::handleHostException;
     mMemoryPressureRouter = new MemoryPressureRouter(context);
-    mMemoryPressureListener =
-        level ->
-            callWithExistingReactInstance(
-                "handleMemoryPressure(" + level + ")",
-                reactInstance -> reactInstance.handleMemoryPressure(level));
     mAllowPackagerServerAccess = allowPackagerServerAccess;
     if (DEV) {
       mDevSupportManager =
@@ -386,6 +381,7 @@ public class ReactHostImpl implements ReactHost {
     return surface;
   }
 
+  @Override
   public MemoryPressureRouter getMemoryPressureRouter() {
     return mMemoryPressureRouter;
   }
@@ -1030,11 +1026,10 @@ public class ReactHostImpl implements ReactHost {
                             mUseDevSupport,
                             getOrCreateReactHostInspectorTarget());
 
-                    if (ReactFeatureFlags
-                        .unstable_bridgelessArchitectureMemoryPressureHackyBoltsFix) {
-                      mMemoryPressureListener = createMemoryPressureListener(instance);
-                    }
-                    mMemoryPressureRouter.addMemoryPressureListener(mMemoryPressureListener);
+                    MemoryPressureListener memoryPressureListener =
+                        createMemoryPressureListener(instance);
+                    mMemoryPressureListener = memoryPressureListener;
+                    mMemoryPressureRouter.addMemoryPressureListener(memoryPressureListener);
 
                     log(method, "Loading JS Bundle");
                     instance.loadJSBundle(bundleLoader);
@@ -1366,8 +1361,10 @@ public class ReactHostImpl implements ReactHost {
                   task -> {
                     reactInstanceTaskUnwrapper.unwrap(task, "4: Destroying ReactContext");
 
-                    log(method, "Removing memory pressure listener");
-                    mMemoryPressureRouter.removeMemoryPressureListener(mMemoryPressureListener);
+                    if (mMemoryPressureListener != null) {
+                      log(method, "Removing memory pressure listener");
+                      mMemoryPressureRouter.removeMemoryPressureListener(mMemoryPressureListener);
+                    }
 
                     final ReactContext reactContext = mBridgelessReactContextRef.getNullable();
                     if (reactContext != null) {