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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | 2x 2x 18x 13x 9x 9x 4x 5x 5x 5x 5x 8x 8x | import { CACHE_KEY_PREFIX, Cacheable, getKeyWithPrefix, ICache, removePrefixFromKey } from './shared'
/**
* Implementation of caching that uses session storage
* */
export class SessionStorageCache implements ICache {
constructor(public prefix: string = CACHE_KEY_PREFIX) {}
/**
* It takes a key and an entry, and sets the entry in the session storage with the key
* @param {string} key - The key to store the entry under.
* @param {Cacheable} entry - The value to be stored in the cache.
*/
public set<T = Cacheable>(key: string, entry: T) {
window.sessionStorage.setItem(getKeyWithPrefix(key, this.prefix), JSON.stringify(entry))
}
/**
* It gets the value of the key from the session storage, parses it as JSON, and returns it
* @param {string} key - The key to store the data under.
* @returns The value of the key in the sessionStorage.
*/
public get<T = Cacheable>(key: string) {
const json = window.sessionStorage.getItem(getKeyWithPrefix(key, this.prefix))
if (!json) {
return
}
try {
return JSON.parse(json) as T
} catch (e) {
return
}
}
/**
* It removes the item from session storage with the given key
* @param {string} key - The key to store the value under.
*/
public remove(key: string) {
window.sessionStorage.removeItem(getKeyWithPrefix(key, this.prefix))
}
/**
* It returns an array of all the keys in the session storage that start with the prefix
* @returns An array of all the keys in the sessionStorage that start with the prefix.
*/
public allKeys() {
return Object.keys(window.sessionStorage)
.filter((key) => key.startsWith(this.prefix))
.map((key) => removePrefixFromKey(key, this.prefix))
}
}
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