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FabricViewStateManager.java
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FabricViewStateManager.java
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/*
* Copyright (c) Facebook, Inc. and its 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.
*/
public class FabricViewStateManager {
private static final String TAG = "FabricViewStateManager";
public interface HasFabricViewStateManager {
FabricViewStateManager getFabricViewStateManager();
}
public interface StateUpdateCallback {
WritableMap getStateUpdate();
}
@Nullable private StateWrapper mStateWrapper = null;
public void setStateWrapper(StateWrapper stateWrapper) {
mStateWrapper = stateWrapper;
}
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);
}
public void setState(final StateUpdateCallback stateUpdateCallback) {
setState(mStateWrapper, stateUpdateCallback, 0);
}
public @Nullable ReadableMap getStateData() {
return mStateWrapper != null ? mStateWrapper.getStateData() : null;
}
}