simple-cache.ts•1.21 kB
/**
* Simple in-memory cache with TTL support
* No external dependencies needed
*/
export class SimpleCache {
private cache = new Map<string, { data: any; expires: number }>();
private cleanupTimer: NodeJS.Timeout | null = null;
constructor() {
// Clean up expired entries every minute
this.cleanupTimer = setInterval(() => {
const now = Date.now();
for (const [key, item] of this.cache.entries()) {
if (item.expires < now) this.cache.delete(key);
}
}, 60000);
}
get(key: string): any {
const item = this.cache.get(key);
if (!item || item.expires < Date.now()) {
this.cache.delete(key);
return null;
}
return item.data;
}
set(key: string, data: any, ttlSeconds: number = 300): void {
this.cache.set(key, {
data,
expires: Date.now() + (ttlSeconds * 1000)
});
}
clear(): void {
this.cache.clear();
}
/**
* Clean up the cache and stop the cleanup timer
* Essential for preventing memory leaks in long-running servers
*/
destroy(): void {
if (this.cleanupTimer) {
clearInterval(this.cleanupTimer);
this.cleanupTimer = null;
}
this.cache.clear();
}
}