mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
David Vacca
503a6f4463
Summary: Props are transferred from C++ to Java using ReadableNativeMaps. The current implementation of ReadableNativeMaps creates an internal HashMap the first time one of its methods is executed. During the update of props ReadableNativeMaps are consumed only once and they are accessed through an Iterator. That's why there is no reason to create the internal HashMap, which is inefficient from performance and memory point of view. This diff creates an experiment that avoids the creation of the internal HashMap during prop updates, additionally it removes a lock that was being used in the creation of the internal HashMap. I expect this change to have a positive impact in TTRC and memory (in particular for ME devices) This diff reduces the amount of ReadableNativeMaps's internal HashMaps created during initial render of MP Home by ~35%. Changelog: [Internal] Reviewed By: JoshuaGross Differential Revision: D25361169 fbshipit-source-id: 7b6efda11922d56127131494ca39b5cec75f1703
104 lines
4.2 KiB
Java
104 lines
4.2 KiB
Java
/*
|
|
* 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.config;
|
|
|
|
/**
|
|
* Hi there, traveller! This configuration class is not meant to be used by end-users of RN. It
|
|
* contains mainly flags for features that are either under active development and not ready for
|
|
* public consumption, or for use in experiments.
|
|
*
|
|
* <p>These values are safe defaults and should not require manual changes.
|
|
*/
|
|
public class ReactFeatureFlags {
|
|
|
|
/**
|
|
* Should this application use TurboModules? If yes, then any module that inherits {@link
|
|
* com.facebook.react.turbomodule.core.interfaces.TurboModule} will NOT be passed in to C++
|
|
* CatalystInstanceImpl
|
|
*/
|
|
public static volatile boolean useTurboModules = false;
|
|
|
|
/** Should we dispatch TurboModule methods with promise returns to the NativeModules thread? */
|
|
public static volatile boolean enableTurboModulePromiseAsyncDispatch = false;
|
|
|
|
/** Enable TurboModule JS Codegen. */
|
|
public static volatile boolean useTurboModuleJSCodegen = false;
|
|
|
|
/**
|
|
* Enable the fix to validate the TurboReactPackage's module info before resolving a TurboModule.
|
|
*/
|
|
public static volatile boolean enableTurboModulePackageInfoValidation = false;
|
|
|
|
/*
|
|
* This feature flag enables logs for Fabric
|
|
*/
|
|
public static boolean enableFabricLogs = false;
|
|
|
|
/**
|
|
* Should this application use a {@link com.facebook.react.uimanager.ViewManagerDelegate} (if
|
|
* provided) to update the view properties. If {@code false}, then the generated {@code
|
|
* ...$$PropsSetter} class will be used instead.
|
|
*/
|
|
public static boolean useViewManagerDelegates = false;
|
|
|
|
/**
|
|
* Should this application use a {@link com.facebook.react.uimanager.ViewManagerDelegate} (if
|
|
* provided) to execute the view commands. If {@code false}, then {@code receiveCommand} method
|
|
* inside view manager will be called instead.
|
|
*/
|
|
public static boolean useViewManagerDelegatesForCommands = false;
|
|
|
|
/**
|
|
* This react flag enables a custom algorithm for the getChildVisibleRect() method in the classes
|
|
* ReactViewGroup, ReactHorizontalScrollView and ReactScrollView.
|
|
*
|
|
* <p>This new algorithm clip child rects if overflow is set to ViewProps.HIDDEN. More details in
|
|
* https://github.com/facebook/react-native/issues/23870 and
|
|
* https://github.com/facebook/react-native/pull/26334
|
|
*
|
|
* <p>The react flag is disabled by default because this is increasing ANRs (T57363204)
|
|
*/
|
|
public static boolean clipChildRectsIfOverflowIsHidden = false;
|
|
|
|
/**
|
|
* Temporary feature flat to control a fix in the transition to layoutOnlyViews TODO T61185028:
|
|
* remove this when bug is fixed
|
|
*/
|
|
public static boolean enableTransitionLayoutOnlyViewCleanup = false;
|
|
|
|
/** Feature flag to configure eager initialization of Fabric */
|
|
public static boolean eagerInitializeFabric = false;
|
|
|
|
/** Use experimental SetState retry mechanism in view? */
|
|
public static boolean enableExperimentalStateUpdateRetry = false;
|
|
|
|
/** Enable caching of Spannable objects using equality of ReadableNativeMaps */
|
|
public static boolean enableSpannableCacheByReadableNativeMapEquality = true;
|
|
|
|
/** Disable customDrawOrder in ReactViewGroup under Fabric only. */
|
|
public static boolean disableCustomDrawOrderFabric = false;
|
|
|
|
/** Use lock-free data structures for Fabric MountItems. */
|
|
public static boolean enableLockFreeMountInstructions = false;
|
|
|
|
/** Temporary flag for FB-internal workaround for RN:Litho interop in non-Fabric RN. */
|
|
public static boolean enableNonFabricRNLithoForceLayout = true;
|
|
|
|
/** Disable UI update operations in non-Fabric renderer after catalyst instance was destroyed */
|
|
public static boolean disableNonFabricViewOperationsOnCatalystDestroy = false;
|
|
|
|
/**
|
|
* Fixes race-condition in the initialization of RN surface. TODO T78832286: remove this flag once
|
|
* we verify the fix is correct in production
|
|
*/
|
|
public static boolean enableStartSurfaceRaceConditionFix = false;
|
|
|
|
/** Enables the usage of an experimental optimized iterator for ReadableNativeMaps. */
|
|
public static boolean enableExperimentalReadableNativeMapIterator = false;
|
|
}
|