Update LRUCache.h

Author: zennyMe17

include/LRUCache.h

@@ -4,21 +4,30 @@
 #include <unordered_map>
 #include <list>
 #include <mutex>
+#include <atomic>
 
 class LRUCache {
 public:
-    LRUCache(int capacity);
+    LRUCache(size_t capacity);
     int get(int key);
     void put(int key, int value);
 
+    // --- New Methods for Stats ---
+    double getHitRate() const;
+    void resetStats();
+
 private:
     void moveToFront(int key);
     void evict();
 
-    int capacity;
-    std::unordered_map<int, std::pair<int, int>> cache; // key -> (value)
-    std::list<int> access_order;                         // order of keys (most recent to least)
+    size_t capacity;
+    std::unordered_map<int, std::pair<int, int>> cache;
+    std::list<int> access_order;
     std::mutex cache_mutex;
+
+    // --- New Stats Counters ---
+    std::atomic<size_t> hits;
+    std::atomic<size_t> accesses;
 };
 
 #endif // LRUCACHE_H