136 lines
3.6 KiB
JavaScript
136 lines
3.6 KiB
JavaScript
/*
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Copyright 2020 Bruno Windels <bruno@windels.cloud>
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import {ObservableValue} from "../observable/ObservableValue.js";
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class Timeout {
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constructor(elapsed, ms) {
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this._reject = null;
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this._handle = null;
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const timeoutValue = elapsed.get() + ms;
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this._waitHandle = elapsed.waitFor(t => t >= timeoutValue);
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}
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elapsed() {
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return this._waitHandle.promise;
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}
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abort() {
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// will reject with AbortError
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this._waitHandle.dispose();
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}
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}
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class Interval {
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constructor(elapsed, ms, callback) {
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this._start = elapsed.get();
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this._last = this._start;
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this._interval = ms;
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this._callback = callback;
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this._subscription = elapsed.subscribe(this._update.bind(this));
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}
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_update(elapsed) {
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const prevAmount = Math.floor((this._last - this._start) / this._interval);
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const newAmount = Math.floor((elapsed - this._start) / this._interval);
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const amountDiff = Math.max(0, newAmount - prevAmount);
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this._last = elapsed;
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for (let i = 0; i < amountDiff; ++i) {
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this._callback();
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}
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}
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dispose() {
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if (this._subscription) {
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this._subscription();
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this._subscription = null;
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}
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}
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}
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class TimeMeasure {
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constructor(elapsed) {
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this._elapsed = elapsed;
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this._start = elapsed.get();
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}
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measure() {
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return this._elapsed.get() - this._start;
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}
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}
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export class Clock {
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constructor(baseTimestamp = 0) {
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this._baseTimestamp = baseTimestamp;
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this._elapsed = new ObservableValue(0);
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// should be callable as a function as well as a method
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this.createMeasure = this.createMeasure.bind(this);
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this.createTimeout = this.createTimeout.bind(this);
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this.now = this.now.bind(this);
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}
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createMeasure() {
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return new TimeMeasure(this._elapsed);
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}
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createTimeout(ms) {
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return new Timeout(this._elapsed, ms);
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}
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createInterval(callback, ms) {
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return new Interval(this._elapsed, ms, callback);
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}
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now() {
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return this._baseTimestamp + this.elapsed;
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}
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elapse(ms) {
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this._elapsed.set(this._elapsed.get() + Math.max(0, ms));
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}
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get elapsed() {
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return this._elapsed.get();
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}
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}
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export function tests() {
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return {
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"test timeout": async assert => {
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const clock = new Clock();
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Promise.resolve().then(() => {
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clock.elapse(500);
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clock.elapse(500);
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}).catch(assert.fail);
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const timeout = clock.createTimeout(1000);
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const promise = timeout.elapsed();
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assert(promise instanceof Promise);
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await promise;
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},
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"test interval": assert => {
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const clock = new Clock();
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let counter = 0;
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const interval = clock.createInterval(() => counter += 1, 200);
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clock.elapse(150);
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assert.strictEqual(counter, 0);
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clock.elapse(500);
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assert.strictEqual(counter, 3);
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interval.dispose();
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}
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}
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}
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