45 lines
1.5 KiB
TypeScript
45 lines
1.5 KiB
TypeScript
/***
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* Saves all the features that are passed in to localstorage, so they can be retrieved on the next run
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*
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* Technically, more an Actor then a featuresource, but it fits more neatly this ay
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*/
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import FeatureSource from "./FeatureSource";
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import {UIEventSource} from "../UIEventSource";
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import LayoutConfig from "../../Customizations/JSON/LayoutConfig";
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export default class LocalStorageSaver implements FeatureSource {
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public static readonly storageKey: string = "cached-features";
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public readonly features: UIEventSource<{ feature: any; freshness: Date }[]>;
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public readonly name = "LocalStorageSaver";
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constructor(source: FeatureSource, layout: UIEventSource<LayoutConfig>) {
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this.features = source.features;
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this.features.addCallbackAndRun(features => {
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if (features === undefined) {
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return;
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}
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const now = new Date().getTime()
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features = features.filter(f => layout.data.cacheTimeout > Math.abs(now - f.freshness.getTime())/1000)
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if(features.length == 0){
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return;
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}
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try {
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const key = LocalStorageSaver.storageKey+layout.data.id
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localStorage.setItem(key, JSON.stringify(features));
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console.log("Saved ",features.length, "elements to",key)
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} catch (e) {
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console.warn("Could not save the features to local storage:", e)
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}
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})
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}
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} |