mirror of
https://github.com/hanzoai/react.git
synced 2026-09-24 17:02:27 +00:00
Add postTask browser scheduler implementation (#19479)
* Reduce code to necessities * Switch to postTask API * Add SchedulerPostTask tests * Updates from review * Fix typo from review * Generate build of unstable_post_task
This commit is contained in:
@@ -0,0 +1,7 @@
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'use strict';
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if (process.env.NODE_ENV === 'production') {
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module.exports = require('./cjs/scheduler-unstable_post_task.production.min.js');
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} else {
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module.exports = require('./cjs/scheduler-unstable_post_task.development.js');
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}
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@@ -28,6 +28,7 @@
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"tracing.js",
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"tracing-profiling.js",
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"unstable_mock.js",
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"unstable_post_task.js",
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"cjs/",
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"umd/"
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],
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@@ -0,0 +1,267 @@
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/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @emails react-core
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* @jest-environment node
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*/
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/* eslint-disable no-for-of-loops/no-for-of-loops */
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'use strict';
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let Scheduler;
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let runtime;
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let performance;
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let cancelCallback;
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let scheduleCallback;
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let NormalPriority;
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// The Scheduler postTask implementation uses a new postTask browser API to
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// schedule work on the main thread. Most of our tests treat this as an
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// implementation detail; however, the sequence and timing of browser
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// APIs are not precisely specified, and can vary across browsers.
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//
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// To prevent regressions, we need the ability to simulate specific edge cases
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// that we may encounter in various browsers.
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//
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// This test suite mocks all browser methods used in our implementation. It
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// assumes as little as possible about the order and timing of events.s
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describe('SchedulerPostTask', () => {
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beforeEach(() => {
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jest.resetModules();
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// Un-mock scheduler
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jest.mock('scheduler', () =>
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require.requireActual('scheduler/unstable_post_task'),
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);
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jest.mock('scheduler/src/SchedulerHostConfig', () =>
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require.requireActual(
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'scheduler/src/forks/SchedulerHostConfig.post-task.js',
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),
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);
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runtime = installMockBrowserRuntime();
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performance = window.performance;
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Scheduler = require('scheduler');
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cancelCallback = Scheduler.unstable_cancelCallback;
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scheduleCallback = Scheduler.unstable_scheduleCallback;
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NormalPriority = Scheduler.unstable_NormalPriority;
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});
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afterEach(() => {
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if (!runtime.isLogEmpty()) {
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throw Error('Test exited without clearing log.');
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}
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});
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function installMockBrowserRuntime() {
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let hasPendingTask = false;
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let timerIDCounter = 0;
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let eventLog = [];
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// Mock window functions
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const window = {};
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global.window = window;
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let currentTime = 0;
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window.performance = {
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now() {
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return currentTime;
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},
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};
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window.setTimeout = (cb, delay) => {
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const id = timerIDCounter++;
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log(`Set Timer`);
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// TODO
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return id;
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};
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window.clearTimeout = id => {
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// TODO
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};
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// Mock browser scheduler.
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const scheduler = {};
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global.scheduler = scheduler;
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let nextTask;
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scheduler.postTask = function(callback) {
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if (hasPendingTask) {
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throw Error('Task already scheduled');
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}
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log('Post Task');
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hasPendingTask = true;
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nextTask = callback;
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};
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function ensureLogIsEmpty() {
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if (eventLog.length !== 0) {
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throw Error('Log is not empty. Call assertLog before continuing.');
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}
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}
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function advanceTime(ms) {
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currentTime += ms;
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}
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function fireNextTask() {
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ensureLogIsEmpty();
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if (!hasPendingTask) {
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throw Error('No task was scheduled');
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}
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hasPendingTask = false;
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log('Task Event');
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// If there's a continuation, it will call postTask again
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// which will set nextTask. That means we need to clear
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// nextTask before the invocation, otherwise we would
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// delete the continuation task.
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const task = nextTask;
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nextTask = null;
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task();
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}
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function log(val) {
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eventLog.push(val);
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}
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function isLogEmpty() {
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return eventLog.length === 0;
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}
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function assertLog(expected) {
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const actual = eventLog;
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eventLog = [];
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expect(actual).toEqual(expected);
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}
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return {
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advanceTime,
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fireNextTask,
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log,
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isLogEmpty,
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assertLog,
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};
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}
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it('task that finishes before deadline', () => {
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scheduleCallback(NormalPriority, () => {
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runtime.log('Task');
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});
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runtime.assertLog(['Post Task']);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'Task']);
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});
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it('task with continuation', () => {
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scheduleCallback(NormalPriority, () => {
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runtime.log('Task');
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while (!Scheduler.unstable_shouldYield()) {
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runtime.advanceTime(1);
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}
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runtime.log(`Yield at ${performance.now()}ms`);
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return () => {
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runtime.log('Continuation');
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};
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});
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runtime.assertLog(['Post Task']);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'Task', 'Yield at 5ms', 'Post Task']);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'Continuation']);
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});
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it('multiple tasks', () => {
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scheduleCallback(NormalPriority, () => {
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runtime.log('A');
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});
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scheduleCallback(NormalPriority, () => {
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runtime.log('B');
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});
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runtime.assertLog(['Post Task']);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'A', 'B']);
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});
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it('multiple tasks with a yield in between', () => {
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scheduleCallback(NormalPriority, () => {
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runtime.log('A');
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runtime.advanceTime(4999);
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});
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scheduleCallback(NormalPriority, () => {
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runtime.log('B');
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});
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runtime.assertLog(['Post Task']);
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runtime.fireNextTask();
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runtime.assertLog([
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'Task Event',
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'A',
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// Ran out of time. Post a continuation event.
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'Post Task',
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]);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'B']);
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});
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it('cancels tasks', () => {
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const task = scheduleCallback(NormalPriority, () => {
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runtime.log('Task');
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});
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runtime.assertLog(['Post Task']);
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cancelCallback(task);
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runtime.assertLog([]);
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});
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it('throws when a task errors then continues in a new event', () => {
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scheduleCallback(NormalPriority, () => {
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runtime.log('Oops!');
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throw Error('Oops!');
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});
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scheduleCallback(NormalPriority, () => {
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runtime.log('Yay');
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});
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runtime.assertLog(['Post Task']);
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expect(() => runtime.fireNextTask()).toThrow('Oops!');
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runtime.assertLog(['Task Event', 'Oops!', 'Post Task']);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'Yay']);
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});
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it('schedule new task after queue has emptied', () => {
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scheduleCallback(NormalPriority, () => {
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runtime.log('A');
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});
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runtime.assertLog(['Post Task']);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'A']);
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scheduleCallback(NormalPriority, () => {
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runtime.log('B');
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});
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runtime.assertLog(['Post Task']);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'B']);
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});
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it('schedule new task after a cancellation', () => {
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const handle = scheduleCallback(NormalPriority, () => {
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runtime.log('A');
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});
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runtime.assertLog(['Post Task']);
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cancelCallback(handle);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event']);
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scheduleCallback(NormalPriority, () => {
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runtime.log('B');
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});
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runtime.assertLog(['Post Task']);
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runtime.fireNextTask();
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runtime.assertLog(['Task Event', 'B']);
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});
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});
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@@ -174,7 +174,7 @@ if (
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// Using console['error'] to evade Babel and ESLint
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console['error'](
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'forceFrameRate takes a positive int between 0 and 125, ' +
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'forcing frame rates higher than 125 fps is not unsupported',
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'forcing frame rates higher than 125 fps is not supported',
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);
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return;
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}
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@@ -5,246 +5,95 @@
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* LICENSE file in the root directory of this source tree.
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*/
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import {enableIsInputPending} from '../SchedulerFeatureFlags';
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// Capture local references to native APIs, in case a polyfill overrides them.
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const perf = window.performance;
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const setTimeout = window.setTimeout;
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const clearTimeout = window.clearTimeout;
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export let requestHostCallback;
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export let cancelHostCallback;
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export let requestHostTimeout;
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export let cancelHostTimeout;
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export let shouldYieldToHost;
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export let requestPaint;
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export let getCurrentTime;
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export let forceFrameRate;
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if (
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// If Scheduler runs in a non-DOM environment, it falls back to a naive
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// implementation using setTimeout.
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typeof window === 'undefined' ||
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// Check if MessageChannel is supported, too.
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typeof MessageChannel !== 'function'
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) {
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// If this accidentally gets imported in a non-browser environment, e.g. JavaScriptCore,
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// fallback to a naive implementation.
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let _callback = null;
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let _timeoutID = null;
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const _flushCallback = function() {
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if (_callback !== null) {
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try {
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const currentTime = getCurrentTime();
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const hasRemainingTime = true;
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_callback(hasRemainingTime, currentTime);
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_callback = null;
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} catch (e) {
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setTimeout(_flushCallback, 0);
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throw e;
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}
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}
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};
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const initialTime = Date.now();
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getCurrentTime = function() {
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return Date.now() - initialTime;
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};
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requestHostCallback = function(cb) {
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if (_callback !== null) {
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// Protect against re-entrancy.
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setTimeout(requestHostCallback, 0, cb);
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} else {
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_callback = cb;
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setTimeout(_flushCallback, 0);
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}
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};
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cancelHostCallback = function() {
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_callback = null;
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};
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requestHostTimeout = function(cb, ms) {
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_timeoutID = setTimeout(cb, ms);
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};
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cancelHostTimeout = function() {
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clearTimeout(_timeoutID);
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};
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shouldYieldToHost = function() {
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return false;
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};
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requestPaint = forceFrameRate = function() {};
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} else {
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// Capture local references to native APIs, in case a polyfill overrides them.
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const performance = window.performance;
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const Date = window.Date;
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const setTimeout = window.setTimeout;
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const clearTimeout = window.clearTimeout;
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if (typeof console !== 'undefined') {
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// TODO: Scheduler no longer requires these methods to be polyfilled. But
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// maybe we want to continue warning if they don't exist, to preserve the
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// option to rely on it in the future?
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const requestAnimationFrame = window.requestAnimationFrame;
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const cancelAnimationFrame = window.cancelAnimationFrame;
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// TODO: Remove fb.me link
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if (typeof requestAnimationFrame !== 'function') {
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// Using console['error'] to evade Babel and ESLint
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console['error'](
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"This browser doesn't support requestAnimationFrame. " +
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'Make sure that you load a ' +
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'polyfill in older browsers. https://fb.me/react-polyfills',
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);
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}
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if (typeof cancelAnimationFrame !== 'function') {
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// Using console['error'] to evade Babel and ESLint
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console['error'](
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"This browser doesn't support cancelAnimationFrame. " +
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'Make sure that you load a ' +
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'polyfill in older browsers. https://fb.me/react-polyfills',
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);
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}
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}
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if (
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typeof performance === 'object' &&
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typeof performance.now === 'function'
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) {
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getCurrentTime = () => performance.now();
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} else {
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const initialTime = Date.now();
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getCurrentTime = () => Date.now() - initialTime;
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}
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let isMessageLoopRunning = false;
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let scheduledHostCallback = null;
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let taskTimeoutID = -1;
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// Scheduler periodically yields in case there is other work on the main
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// thread, like user events. By default, it yields multiple times per frame.
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// It does not attempt to align with frame boundaries, since most tasks don't
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// need to be frame aligned; for those that do, use requestAnimationFrame.
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let yieldInterval = 5;
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let deadline = 0;
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// TODO: Make this configurable
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// TODO: Adjust this based on priority?
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const maxYieldInterval = 300;
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let needsPaint = false;
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if (
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enableIsInputPending &&
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navigator !== undefined &&
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navigator.scheduling !== undefined &&
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navigator.scheduling.isInputPending !== undefined
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) {
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const scheduling = navigator.scheduling;
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shouldYieldToHost = function() {
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const currentTime = getCurrentTime();
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if (currentTime >= deadline) {
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// There's no time left. We may want to yield control of the main
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// thread, so the browser can perform high priority tasks. The main ones
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// are painting and user input. If there's a pending paint or a pending
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// input, then we should yield. But if there's neither, then we can
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// yield less often while remaining responsive. We'll eventually yield
|
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// regardless, since there could be a pending paint that wasn't
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// accompanied by a call to `requestPaint`, or other main thread tasks
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// like network events.
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if (needsPaint || scheduling.isInputPending()) {
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// There is either a pending paint or a pending input.
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return true;
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}
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// There's no pending input. Only yield if we've reached the max
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// yield interval.
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return currentTime >= maxYieldInterval;
|
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} else {
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// There's still time left in the frame.
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return false;
|
||||
}
|
||||
};
|
||||
|
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requestPaint = function() {
|
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needsPaint = true;
|
||||
};
|
||||
} else {
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// `isInputPending` is not available. Since we have no way of knowing if
|
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// there's pending input, always yield at the end of the frame.
|
||||
shouldYieldToHost = function() {
|
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return getCurrentTime() >= deadline;
|
||||
};
|
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|
||||
// Since we yield every frame regardless, `requestPaint` has no effect.
|
||||
requestPaint = function() {};
|
||||
}
|
||||
|
||||
forceFrameRate = function(fps) {
|
||||
if (fps < 0 || fps > 125) {
|
||||
// Using console['error'] to evade Babel and ESLint
|
||||
console['error'](
|
||||
'forceFrameRate takes a positive int between 0 and 125, ' +
|
||||
'forcing frame rates higher than 125 fps is not unsupported',
|
||||
);
|
||||
return;
|
||||
}
|
||||
if (fps > 0) {
|
||||
yieldInterval = Math.floor(1000 / fps);
|
||||
} else {
|
||||
// reset the framerate
|
||||
yieldInterval = 5;
|
||||
}
|
||||
};
|
||||
|
||||
const performWorkUntilDeadline = () => {
|
||||
if (scheduledHostCallback !== null) {
|
||||
const currentTime = getCurrentTime();
|
||||
// Yield after `yieldInterval` ms, regardless of where we are in the vsync
|
||||
// cycle. This means there's always time remaining at the beginning of
|
||||
// the message event.
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||||
deadline = currentTime + yieldInterval;
|
||||
const hasTimeRemaining = true;
|
||||
try {
|
||||
const hasMoreWork = scheduledHostCallback(
|
||||
hasTimeRemaining,
|
||||
currentTime,
|
||||
);
|
||||
if (!hasMoreWork) {
|
||||
isMessageLoopRunning = false;
|
||||
scheduledHostCallback = null;
|
||||
} else {
|
||||
// If there's more work, schedule the next message event at the end
|
||||
// of the preceding one.
|
||||
port.postMessage(null);
|
||||
}
|
||||
} catch (error) {
|
||||
// If a scheduler task throws, exit the current browser task so the
|
||||
// error can be observed.
|
||||
port.postMessage(null);
|
||||
throw error;
|
||||
}
|
||||
} else {
|
||||
isMessageLoopRunning = false;
|
||||
}
|
||||
// Yielding to the browser will give it a chance to paint, so we can
|
||||
// reset this.
|
||||
needsPaint = false;
|
||||
};
|
||||
|
||||
const channel = new MessageChannel();
|
||||
const port = channel.port2;
|
||||
channel.port1.onmessage = performWorkUntilDeadline;
|
||||
|
||||
requestHostCallback = function(callback) {
|
||||
scheduledHostCallback = callback;
|
||||
if (!isMessageLoopRunning) {
|
||||
isMessageLoopRunning = true;
|
||||
port.postMessage(null);
|
||||
}
|
||||
};
|
||||
|
||||
cancelHostCallback = function() {
|
||||
scheduledHostCallback = null;
|
||||
};
|
||||
|
||||
requestHostTimeout = function(callback, ms) {
|
||||
taskTimeoutID = setTimeout(() => {
|
||||
callback(getCurrentTime());
|
||||
}, ms);
|
||||
};
|
||||
|
||||
cancelHostTimeout = function() {
|
||||
clearTimeout(taskTimeoutID);
|
||||
taskTimeoutID = -1;
|
||||
};
|
||||
function postTask(callback) {
|
||||
// Use experimental Chrome Scheduler postTask API.
|
||||
global.scheduler.postTask(callback);
|
||||
}
|
||||
|
||||
function getNow() {
|
||||
return perf.now();
|
||||
}
|
||||
|
||||
let isTaskLoopRunning = false;
|
||||
let scheduledHostCallback = null;
|
||||
let taskTimeoutID = -1;
|
||||
|
||||
// Scheduler periodically yields in case there is other work on the main
|
||||
// thread, like user events. By default, it yields multiple times per frame.
|
||||
// It does not attempt to align with frame boundaries, since most tasks don't
|
||||
// need to be frame aligned; for those that do, use requestAnimationFrame.
|
||||
const yieldInterval = 5;
|
||||
let deadline = 0;
|
||||
|
||||
// `isInputPending` is not available. Since we have no way of knowing if
|
||||
// there's pending input, always yield at the end of the frame.
|
||||
export function shouldYieldToHost() {
|
||||
return getNow() >= deadline;
|
||||
}
|
||||
|
||||
export function requestPaint() {
|
||||
// Since we yield every frame regardless, `requestPaint` has no effect.
|
||||
}
|
||||
|
||||
export function forceFrameRate(fps) {
|
||||
// No-op
|
||||
}
|
||||
|
||||
function performWorkUntilDeadline() {
|
||||
if (scheduledHostCallback !== null) {
|
||||
const currentTime = getNow();
|
||||
// Yield after `yieldInterval` ms, regardless of where we are in the vsync
|
||||
// cycle. This means there's always time remaining at the beginning of
|
||||
// the message event.
|
||||
deadline = currentTime + yieldInterval;
|
||||
const hasTimeRemaining = true;
|
||||
try {
|
||||
const hasMoreWork = scheduledHostCallback(hasTimeRemaining, currentTime);
|
||||
if (!hasMoreWork) {
|
||||
isTaskLoopRunning = false;
|
||||
scheduledHostCallback = null;
|
||||
} else {
|
||||
// If there's more work, schedule the next message event at the end
|
||||
// of the preceding one.
|
||||
postTask(performWorkUntilDeadline);
|
||||
}
|
||||
} catch (error) {
|
||||
// If a scheduler task throws, exit the current browser task so the
|
||||
// error can be observed.
|
||||
postTask(performWorkUntilDeadline);
|
||||
throw error;
|
||||
}
|
||||
} else {
|
||||
isTaskLoopRunning = false;
|
||||
}
|
||||
}
|
||||
|
||||
export function requestHostCallback(callback) {
|
||||
scheduledHostCallback = callback;
|
||||
if (!isTaskLoopRunning) {
|
||||
isTaskLoopRunning = true;
|
||||
postTask(performWorkUntilDeadline);
|
||||
}
|
||||
}
|
||||
|
||||
export function cancelHostCallback() {
|
||||
scheduledHostCallback = null;
|
||||
}
|
||||
|
||||
export function requestHostTimeout(callback, ms) {
|
||||
taskTimeoutID = setTimeout(() => {
|
||||
callback(getNow());
|
||||
}, ms);
|
||||
}
|
||||
|
||||
export function cancelHostTimeout() {
|
||||
clearTimeout(taskTimeoutID);
|
||||
taskTimeoutID = -1;
|
||||
}
|
||||
|
||||
export const getCurrentTime = getNow;
|
||||
|
||||
@@ -634,8 +634,15 @@ const bundles = [
|
||||
externals: [],
|
||||
},
|
||||
|
||||
/******* React Scheduler Post Task (experimental) *******/
|
||||
{
|
||||
bundleTypes: [FB_WWW_DEV, FB_WWW_PROD, FB_WWW_PROFILING],
|
||||
bundleTypes: [
|
||||
NODE_DEV,
|
||||
NODE_PROD,
|
||||
FB_WWW_DEV,
|
||||
FB_WWW_PROD,
|
||||
FB_WWW_PROFILING,
|
||||
],
|
||||
moduleType: ISOMORPHIC,
|
||||
entry: 'scheduler/unstable_post_task',
|
||||
global: 'SchedulerPostTask',
|
||||
|
||||
Reference in New Issue
Block a user