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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | 1x 1x 50x 50x 1x 1x 1x 1x 16x 16x 1x 1x 16x 16x 1x 1x 15x 15x 5x 5x 5x 5x 10x 10x 10x 10x 1x | import Scheduler from "./Scheduler"; import {newId, EdgeError, LoadEvent} from "./Shared"; /** * Loads linked resources. By default uses the global fetch function if any. * This behavior can be overridden by adding an event listener to * the load event and calling 'setValue' with the Node or Graph * requested. */ export default class Loader<T> { cache: { [key: string]: T; }; scheduler: Scheduler; constructor(scheduler: Scheduler) { this.scheduler = scheduler; this.cache = {}; } clearCache(): void { Object.keys(this.cache).forEach((key) => { delete this.cache[key]; }); } async load(url: string): Promise<T> { this.scheduler.logger.debug("Loader: loading: " + url); const ev = { time: Date.now(), id: newId(), url, setValue: (val: T) => { this.scheduler.logger.debug("Loader: loading resource via load event: " + url); this.cache[url] = val; } } as LoadEvent; this.scheduler.dispatchEvent("load", ev); if (this.cache[url]) { this.scheduler.logger.debug("Loader: cache hit: " + url); return this.cache[url]; } this.scheduler.logger.debug("Loader: cache miss: " + url); if (typeof fetch === "undefined") { const er = new Error("Fetch is not defined. For URLs to be " + "fetched you must define a global fetch method that complies " + "with https://fetch.spec.whatwg.org/."); this.scheduler.logger.error(er.stack); this.scheduler.dispatchEvent("error", { id: newId(), time: Date.now(), err: er, url, message: er.toString(), } as EdgeError); throw er; } this.scheduler.logger.debug("Loader: loading resource via fetch: " + url); const data = await fetch(url); this.cache[url] = await data.json(); return this.cache[url]; } } |