32 lines
1019 B
JavaScript
32 lines
1019 B
JavaScript
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// A store where you can divide data into "realms" that are backed with an LRU cache.
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// Each realm has self-contained data that you can set with setForRealm() and compute
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// with computeForRealm(). The maxSize determines how many realms to keep in the LRU cache.
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import { Store } from 'svelte/store.js'
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import QuickLRU from 'quick-lru'
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export class RealmStore extends Store {
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constructor(init, maxSize) {
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super(init)
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this.set({realms: new QuickLRU({maxSize: maxSize})})
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}
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setCurrentRealm(realm) {
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this.set({currentRealm: realm})
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}
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setForRealm(obj) {
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let realmName = this.get('currentRealm')
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let realms = this.get('realms')
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realms.set(realmName, Object.assign(realms.get(realmName) || {}, obj))
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this.set({realms: realms})
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}
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computeForRealm(key, defaultValue) {
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this.compute(key,
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['realms', 'currentRealm'],
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(realms, currentRealm) => {
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let realmData = realms.get(currentRealm)
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return (realmData && realmData[key]) || defaultValue
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})
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}
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}
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