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cache.ts
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cache.ts
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export class Cache {
cache = new Map()
constructor() {
}
/**
* @param {String} key (required) - cache key
* @param {Object} value (required) - cache value
* @param {Number} expire (required) - cache expiration time (seconds)
* */
set(key:string, value:any, ttl:number) {
const expire = (1000 * ttl) + Date.now();
this.cache.set(key, { value, expire })
}
/**
* @param {String} key (required) - cache key to get
* */
get(key:string) {
if(!key) throw new Error('key is required!');
let record = this.cache.get(key);
if (!record) return null;
if (!record.expire || record.expire > Date.now()) return record.value;
else return this.remove(key);
}
/**
* @param {String} key (required) - cache key to remove
* */
remove(key:string) {
let record = this.cache.get(key);
if (!record) return null;
this.cache.delete(key);
return null;
}
}