mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Joshua Gross
16ce685708
Summary: I have never seen these asserts fire in production. They're pretty cheap but the cost is not zero. We will use annotations and test carefully in debug if we need to ensure that something runs on a particular thread - which we do anyway. Motivation: this method is called /extremely frequently/, everywhere in the mounting layer. And 99.99% of the time it's completely useless and results in absolutely no signal. In many cases, it will be called hundreds or thousands of times during a single operation (for example, when executing the IntMountBuffer items, each sub-item will call this many times). Wall-clock time is usually low according to systrace (sometimes there are odd spikes), but over time these do add up and it seems good to save a few ms here and there. Changelog: [Internal] Reviewed By: javache Differential Revision: D36539399 fbshipit-source-id: 3e023be64b8c9f0e6c3c8347c077ce9fa38f74a4
62 lines
2.1 KiB
Java
62 lines
2.1 KiB
Java
/*
|
|
* 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.bridge;
|
|
|
|
import android.os.Handler;
|
|
import android.os.Looper;
|
|
import androidx.annotation.Nullable;
|
|
import com.facebook.react.common.build.ReactBuildConfig;
|
|
|
|
/** Utility for interacting with the UI thread. */
|
|
public class UiThreadUtil {
|
|
|
|
@Nullable private static Handler sMainHandler;
|
|
|
|
/** @return {@code true} if the current thread is the UI thread. */
|
|
public static boolean isOnUiThread() {
|
|
return Looper.getMainLooper().getThread() == Thread.currentThread();
|
|
}
|
|
|
|
/**
|
|
* Throws an {@link AssertionException} if the current thread is not the UI thread. This is a noop
|
|
* in production, and is only meant to run in debug mode! If you need to check for
|
|
* incorrect-thread issues in production, duplicate this code and call it elsewhere.
|
|
*/
|
|
public static void assertOnUiThread() {
|
|
if (ReactBuildConfig.DEBUG) {
|
|
SoftAssertions.assertCondition(isOnUiThread(), "Expected to run on UI thread!");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Throws an {@link AssertionException} if the current thread is the UI thread. This is a noop in
|
|
* production, and is only meant to run in debug mode! If you need to check for incorrect-thread
|
|
* issues in production, duplicate this code and call it elsewhere.
|
|
*/
|
|
public static void assertNotOnUiThread() {
|
|
if (ReactBuildConfig.DEBUG) {
|
|
SoftAssertions.assertCondition(!isOnUiThread(), "Expected not to run on UI thread!");
|
|
}
|
|
}
|
|
|
|
/** Runs the given {@code Runnable} on the UI thread. */
|
|
public static void runOnUiThread(Runnable runnable) {
|
|
runOnUiThread(runnable, 0);
|
|
}
|
|
|
|
/** Runs the given {@code Runnable} on the UI thread with the specified delay. */
|
|
public static void runOnUiThread(Runnable runnable, long delayInMs) {
|
|
synchronized (UiThreadUtil.class) {
|
|
if (sMainHandler == null) {
|
|
sMainHandler = new Handler(Looper.getMainLooper());
|
|
}
|
|
}
|
|
sMainHandler.postDelayed(runnable, delayInMs);
|
|
}
|
|
}
|