@apify/actors-mcp-server
Version:
Model Context Protocol Server for Apify
69 lines • 2.27 kB
JavaScript
import { LruCache } from '@apify/datastructures';
/**
* LRU cache with TTL (time-to-live) for storing entries.
*
* This class wraps an LRU cache and adds a time-to-live (TTL) expiration to each entry.
* When an entry is accessed, it is checked for expiration and removed if expired.
*
* Usage:
* ```typescript
* const cache = new TTLLRUCache<string>(100, 60); // 100 items, 60 seconds TTL
* cache.set('key', 'value');
* const value = cache.get('key');
* ```
*/
export class TTLLRUCache {
/**
* @param maxLength Maximum number of items in the cache (LRU eviction)
* @param ttlSecs Time-to-live for each entry, in seconds
*/
constructor(maxLength, ttlSecs) {
// Internal LRU cache storing value and expiration timestamp for each entry
Object.defineProperty(this, "cache", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
// Time-to-live in milliseconds for each entry
Object.defineProperty(this, "ttlMillis", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
this.ttlMillis = ttlSecs * 1000;
this.cache = new LruCache({
maxLength,
});
}
/**
* Set a value in the cache with the given key. If the key exists, it is updated and TTL is reset.
* @param key Cache key
* @param value Value to store
*/
set(key, value) {
// If the key already exists, remove it to update the value and reset TTL
if (this.cache.get(key)) {
this.cache.remove(key);
}
this.cache.add(key, {
value,
expiresAt: Date.now() + this.ttlMillis,
});
}
/**
* Get a value from the cache by key. Returns null if not found or expired.
* @param key Cache key
* @returns The value if present and not expired, otherwise null
*/
get(key) {
const entry = this.cache.get(key);
if (entry && entry.expiresAt > Date.now()) {
return entry.value;
}
this.cache.remove(key); // Remove expired entry
return null;
}
}
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