72 lines
2.1 KiB
JavaScript
72 lines
2.1 KiB
JavaScript
// 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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import { mark, stop } from './marks'
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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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this._batches = {}
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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 { currentRealm, realms } = this.get()
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realms.set(currentRealm, Object.assign(realms.get(currentRealm) || {}, 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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* Update several values at once in a realm, assuming the key points
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* to a plain old javascript object.
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*/
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batchUpdateForRealm (key, subKey, value) {
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let { currentRealm } = this.get()
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let realmBatches = this._batches[currentRealm]
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if (!realmBatches) {
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realmBatches = this._batches[currentRealm] = {}
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}
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let batch = realmBatches[key]
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if (!batch) {
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batch = realmBatches[key] = {}
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}
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batch[subKey] = value
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requestAnimationFrame(() => {
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let batch = this._batches[currentRealm] && this._batches[currentRealm][key]
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if (!batch) {
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return
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}
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let updatedKeys = Object.keys(batch)
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if (!updatedKeys.length) {
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return
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}
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mark('batchUpdate')
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let obj = this.get()[key]
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for (let otherKey of updatedKeys) {
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obj[otherKey] = batch[otherKey]
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}
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delete this._batches[currentRealm][key]
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let { realms } = this.get()
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realms.set(currentRealm, Object.assign(realms.get(currentRealm) || {}, {[key]: obj}))
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this.set({realms: realms})
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stop('batchUpdate')
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})
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}
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}
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