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/**
* Represents an in-memory cache with TTL (Time To Live) support.
*/
export class Cache {
private cache = new Map<
string,
{
ttl: number
value: any
}
>()
private maxCacheCap: number
/**
* Creates an instance of Cache.
*/
constructor() {
this.maxCacheCap = this.calculateMaxCapacity()
}
/**
* Calculates the maximum capacity of the cache based on available system memory.
* @returns The maximum capacity of the cache.
*/
private calculateMaxCapacity(): number {
const totalMemory = totalmem()
const maxCapacityPercentage = 0.2
const maxCapacityBytes = totalMemory * maxCapacityPercentage
return Math.floor(maxCapacityBytes / (1024 * 50))
}
/**
* Retrieves the value associated with the specified key from the cache.
* @param key - The key to look up in the cache.
* @returns The cached value if found and not expired; otherwise, returns null.
*/
get(key: string): any | null {
const entry = this.cache.get(key)
if (entry && Date.now() < entry.ttl) {
return entry.value
}
return null
}
/**
* Stores a key-value pair in the cache with a specified TTL (Time To Live).
* @param key - The key to store in the cache.
* @param value - The value to associate with the key.
* @param ttl - The TTL (Time To Live) in seconds for the cached entry.
*/
set(key: string, value: any, ttl: number): void {
if (ttl < 1) {
return
}
if (this.cache.size >= this.maxCacheCap) {
const oldestKey = this.cache.keys().next().value
this.cache.delete(oldestKey)
}
const expireTime = Date.now() + ttl * 1000
const entry = { value, ttl: expireTime }
this.cache.set(key, entry)
}
/**
* Removes the entry with the specified key from the cache.
* @param key - The key to delete from the cache.
*/
delete(key: string): void {
this.cache.delete(key)
}
/**
* Checks if the cache contains an entry with the specified key.
* @param key - The key to check in the cache.
* @returns True if the cache contains the key; otherwise, false.
*/
has(key: string): boolean {
return this.get(key) !== null
}
}
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