pinafore/src/routes/_utils/RealmStore.js

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// A store where you can divide data into "realms" that are backed with an LRU cache.
// Each realm has self-contained data that you can set with setForRealm() and compute
// with computeForRealm(). The maxSize determines how many realms to keep in the LRU cache.
import { Store } from 'svelte/store.js'
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)
this.set({ realms: new QuickLRU({ maxSize: maxSize }) })
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this._batches = {}
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}
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setCurrentRealm (realm) {
this.set({ currentRealm: realm })
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}
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setForRealm (obj) {
let { currentRealm, realms } = this.get()
realms.set(currentRealm, Object.assign(realms.get(currentRealm) || {}, obj))
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'],
(realms, currentRealm) => {
let realmData = realms.get(currentRealm)
return (realmData && realmData[key]) || defaultValue
})
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}
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/*
* Update several values at once in a realm, assuming the key points
* to a plain old javascript object.
*/
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batchUpdateForRealm (key, subKey, value) {
let { currentRealm } = this.get()
let realmBatches = this._batches[currentRealm]
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if (!realmBatches) {
realmBatches = this._batches[currentRealm] = {}
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}
let batch = realmBatches[key]
if (!batch) {
batch = realmBatches[key] = {}
}
batch[subKey] = value
requestAnimationFrame(() => {
let batch = this._batches[currentRealm] && this._batches[currentRealm][key]
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if (!batch) {
return
}
let updatedKeys = Object.keys(batch)
if (!updatedKeys.length) {
return
}
mark('batchUpdate')
let obj = this.get()[key]
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for (let otherKey of updatedKeys) {
obj[otherKey] = batch[otherKey]
}
delete this._batches[currentRealm][key]
let { realms } = this.get()
realms.set(currentRealm, Object.assign(realms.get(currentRealm) || {}, { [key]: obj }))
this.set({ realms: realms })
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stop('batchUpdate')
})
}
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}