interface CacheItem<T> {
data: T;
expires: number;
timestamp: number;
}
interface CacheStats {
hits: number;
misses: number;
size: number;
hitRate: number;
}
export class CacheService {
private cache = new Map<string, CacheItem<any>>();
private stats: CacheStats = {
hits: 0,
misses: 0,
size: 0,
hitRate: 0
};
// TTL değerleri (milisaniye)
private readonly TTL = {
SEARCH_RESULTS: 5 * 60 * 1000, // 5 dakika
DECISION_DETAILS: 30 * 60 * 1000, // 30 dakika
ERROR_CACHE: 2 * 60 * 1000, // 2 dakika
POPULAR_QUERY: 24 * 60 * 60 * 1000 // 24 saat
};
set<T>(key: string, data: T, ttlMs?: number): void {
const ttl = ttlMs || this.TTL.SEARCH_RESULTS;
const expires = Date.now() + ttl;
this.cache.set(key, {
data,
expires,
timestamp: Date.now()
});
this.updateStats();
console.log(`>>> Cache SET: ${key} (TTL: ${ttlMs}ms)`);
}
get<T>(key: string): T | null {
const item = this.cache.get(key);
if (!item) {
this.stats.misses++;
this.updateStats();
console.log(`>>> Cache MISS: ${key}`);
return null;
}
// TTL kontrolü
if (Date.now() > item.expires) {
this.cache.delete(key);
this.stats.misses++;
this.updateStats();
console.log(`>>> Cache EXPIRED: ${key}`);
return null;
}
this.stats.hits++;
this.updateStats();
console.log(`>>> Cache HIT: ${key}`);
return item.data as T;
}
delete(key: string): boolean {
const deleted = this.cache.delete(key);
if (deleted) {
console.log(`>>> Cache DELETE: ${key}`);
this.updateStats();
}
return deleted;
}
clear(): void {
const size = this.cache.size;
this.cache.clear();
this.stats = {
hits: 0,
misses: 0,
size: 0,
hitRate: 0
};
console.log(`>>> Cache CLEAR: ${size} item silindi`);
}
// Expire olmuş item'ları temizle
cleanup(): number {
const now = Date.now();
let cleaned = 0;
for (const [key, item] of this.cache.entries()) {
if (now > item.expires) {
this.cache.delete(key);
cleaned++;
}
}
if (cleaned > 0) {
console.log(`>>> Cache CLEANUP: ${cleaned} expired item silindi`);
this.updateStats();
}
return cleaned;
}
// Cache key generator'ları
generateSearchKey(query: string): string {
return `search:${query.toLowerCase().trim()}`;
}
generateDetailKey(query: string, index: number): string {
return `detail:${query.toLowerCase().trim()}:${index}`;
}
generateErrorKey(query: string): string {
return `error:${query.toLowerCase().trim()}`;
}
// Popular queries için özel key
generatePopularKey(query: string): string {
return `popular:${query.toLowerCase().trim()}`;
}
// Stats güncelleme
private updateStats(): void {
this.stats.size = this.cache.size;
const total = this.stats.hits + this.stats.misses;
this.stats.hitRate = total > 0 ? Math.round((this.stats.hits / total) * 100) : 0;
}
// Cache bilgilerini al
getStats(): CacheStats {
return { ...this.stats };
}
// Cache içeriğini al (debug için)
getCacheInfo(): Array<{ key: string; age: number; ttl: number }> {
const now = Date.now();
return Array.from(this.cache.entries()).map(([key, item]) => ({
key,
age: now - item.timestamp,
ttl: item.expires - now
}));
}
// Memory usage estimate
getMemoryUsage(): number {
// Basit hesaplama: her item için ortalama 1KB tahmini
return this.cache.size * 1024;
}
// Periodic cleanup
startPeriodicCleanup(intervalMs: number = 60000): NodeJS.Timeout {
return setInterval(() => {
this.cleanup();
}, intervalMs);
}
}
export const cacheService = new CacheService();
