updated singletonMeta class with lru_cache

Author: kirankotari

netsim_wrapper/common/singleton.py

@@ -2,14 +2,9 @@
 Singleton Metaclass
 """
 
-class SingletonMeta(type):
-    """
-    Singleton Metaclass
-    """
 
-    _instance = None
+from functools import lru_cache
+
 
-    def __call__(cls, *args, **kwargs):
-        if not cls._instance:
-            cls._instance = super().__call__(*args, **kwargs)
-        return cls._instance
+class SingletonMeta(type):
+    __call__ = lru_cache(type.__call__)