From 4fdc5945b1e00d23b6b149070b9403b436fd48ff Mon Sep 17 00:00:00 2001
From: Samuel Susla <samuelsusla@meta.com>
Date: Mon, 16 Oct 2023 06:21:07 -0700
Subject: [PATCH] Re-introduce FabricViewStateManager interface (#40998)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/40998

changelog: [Android] Add back interface FabricViewStateManager to unblock 0.73

I incorrectly deleted FabricViewStateManager in D47993140. This is a breaking change even for old architecture. Let's add it back and mark it as deprected so we can remove it later on.
This interface is not used in react-native anymore.

We are removing FabricViewStateManager because it simply wraps StateWrapper and provides no additional anymore.

Reviewed By: cortinico

Differential Revision: D50318633

fbshipit-source-id: aeb1c66c35018e336339616b564dee6f3156b54b
---
 .../uimanager/FabricViewStateManager.java     | 95 +++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/FabricViewStateManager.java

diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/FabricViewStateManager.java b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/FabricViewStateManager.java
new file mode 100644
index 00000000000000..02ea431f7f4828
--- /dev/null
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/FabricViewStateManager.java
@@ -0,0 +1,95 @@
+/*
+ * 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.uimanager;
+
+import androidx.annotation.Nullable;
+import com.facebook.common.logging.FLog;
+import com.facebook.react.bridge.ReadableMap;
+import com.facebook.react.bridge.WritableMap;
+
+/**
+ * This is a helper base class for ViewGroups that use Fabric State.
+ *
+ * <p>Reason to use this: UpdateState calls from the View layer to the Fabric core can fail, and
+ * optionally Fabric will call a "failure callback" if that happens. This class abstracts that and
+ * makes it easier ensure that State in Fabric is always up-to-date.
+ *
+ * <p>1. Whenever ViewManager.updateState is called, call View.setStateWrapper. 2. Instead of
+ * calling StateWrapper.updateState directly, call View.setState and it will automatically keep
+ * retrying the UpdateState call until it succeeds; or you call setState again; or the View layer is
+ * updated with a newer StateWrapper.
+ */
+@Deprecated(
+    since =
+        "Deprecated class since v0.73.0, please use com.facebook.react.uimanager.StateWrapper instead.",
+    forRemoval = true)
+public class FabricViewStateManager {
+  private static final String TAG = "FabricViewStateManager";
+
+  @Deprecated
+  public interface HasFabricViewStateManager {
+    FabricViewStateManager getFabricViewStateManager();
+  }
+
+  @Deprecated
+  public interface StateUpdateCallback {
+    WritableMap getStateUpdate();
+  }
+
+  @Nullable private StateWrapper mStateWrapper = null;
+
+  @Deprecated
+  public void setStateWrapper(StateWrapper stateWrapper) {
+    mStateWrapper = stateWrapper;
+  }
+
+  @Deprecated
+  public boolean hasStateWrapper() {
+    return mStateWrapper != null;
+  }
+
+  private void setState(
+      @Nullable final StateWrapper stateWrapper,
+      final StateUpdateCallback stateUpdateCallback,
+      final int numTries) {
+    // The StateWrapper will change, breaking the async loop, whenever the UpdateState MountItem
+    // is executed.
+    // The caller is responsible for detecting if data is up-to-date, and doing nothing, or
+    // detecting if state is stale and calling setState again.
+    if (stateWrapper == null) {
+      FLog.e(TAG, "setState called without a StateWrapper");
+      return;
+    }
+    if (stateWrapper != mStateWrapper) {
+      return;
+    }
+    // We bail out after an arbitrary number of tries. In practice this should never go higher
+    // than 2 or 3, but there's nothing guaranteeing that.
+    if (numTries > 60) {
+      return;
+    }
+
+    @Nullable WritableMap stateUpdate = stateUpdateCallback.getStateUpdate();
+    if (stateUpdate == null) {
+      return;
+    }
+
+    // TODO: State update cannot fail; remove `failureRunnable` and custom retrying logic.
+    stateWrapper.updateState(stateUpdate);
+  }
+
+  @Deprecated
+  public void setState(final StateUpdateCallback stateUpdateCallback) {
+    setState(mStateWrapper, stateUpdateCallback, 0);
+  }
+
+  @Deprecated
+  public @Nullable ReadableMap getStateData() {
+    return mStateWrapper != null ? mStateWrapper.getStateData() : null;
+  }
+}