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import {Collection} from "@extollo/util"
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import {Cache} from "./Cache"
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/**
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* An in-memory implementation of the Cache.
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* This is the default implementation for compatibility, but applications should switch to a persistent-backed cache driver.
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*/
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export class MemoryCache extends Cache {
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/** Static collection of in-memory cache items. */
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private static cacheItems: Collection<{key: string, value: string, expires?: Date}> = new Collection<{key: string; value: string, expires?: Date}>()
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public fetch(key: string): string | Promise<string | undefined> | undefined {
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const now = new Date()
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return MemoryCache.cacheItems
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.where('key', '=', key)
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.firstWhere(item => {
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return !item.expires || now < item.expires
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})?.value
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}
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public put(key: string, value: string, expires?: Date): void | Promise<void> {
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const existing = MemoryCache.cacheItems.firstWhere('key', '=', key)
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if ( existing ) {
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existing.value = value
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existing.expires = expires
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} else {
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MemoryCache.cacheItems.push({ key, value, expires })
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}
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}
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public has(key: string): boolean | Promise<boolean> {
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const now = new Date()
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return !!MemoryCache.cacheItems
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.where('key', '=', key)
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.firstWhere(item => {
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return !item.expires || now < item.expires
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})
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}
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public drop(key: string): void | Promise<void> {
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MemoryCache.cacheItems = MemoryCache.cacheItems.where('key', '!=', key)
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}
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}
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