75 lines
2.0 KiB
JavaScript
75 lines
2.0 KiB
JavaScript
"use strict";
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import Config from './ClientConfig.mjs';
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class WorkerWrapper {
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constructor() {
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this.worker = new Worker("worker.js"); // We could pass { type: "module" } as the 2nd argument here to allow Rollup code splitting to function as normal, but it's not supported by browsers yet
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}
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/**
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* Sets up the Web Worker that does the TensorFlow prediction.
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* Using a web worker avoids hanging the main thread.
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* @return {Promise} A Promise that resolves when setup is complete.
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*/
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setup(map_bounds, index) {
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// Arrow functions inherit the parent scope, including the "this"
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// special variable.
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return new Promise((resolve, reject) => {
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// Attach the listener first
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this.worker.addEventListener("message", (event) => {
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if(event.data.event !== "setup-complete") {
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reject(`Error: AIWorker responded with event ${event.data.event}, but 'setup-complete' was expected.`, event.data);
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return;
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}
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resolve();
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}, { once: true });
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// Ask the web worker to set itself up
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this.worker.postMessage({
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event: "setup",
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setup_info: {
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bounds: map_bounds,
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index,
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Config
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}
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});
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})
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}
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/**
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* Uses the Web Worker to predict a row of signal strength values.
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* @param {number} latitude The latitude for which predictions should be made.
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* @return {Promise<number[]>} A Promise returning the array of predictions calculated by the web worker.
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*/
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predict_row(latitude) {
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return new Promise((resolve, reject) => {
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// Attach the event listener....
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this.worker.addEventListener("message", (event) => {
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if(event.data.event !== "result") {
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reject(`Error: AIWorker responded with event ${event.data.event}, but 'result' was expected.`, event.data);
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return;
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}
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resolve(event.data);
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}, { once: true });
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// ....and send the request
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this.worker.postMessage({
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event: "predict-row",
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latitude
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});
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});
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}
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end() {
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this.worker.postMessage({
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event: "end"
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})
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}
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}
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export default WorkerWrapper;
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