added table manager, to manage tables and handle the treeview

miners/miner_factory.py

@@ -42,17 +42,19 @@ from settings import (
 )
 
 
-class MinerFactory:
-    _instance = None
+class Singleton(type):
+    _instances = {}
 
+    def __call__(cls, *args, **kwargs):
+        if cls not in cls._instances:
+            cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
+        return cls._instances[cls]
+
+
+class MinerFactory(metaclass=Singleton):
     def __init__(self):
         self.miners = {}
 
-    def __new__(cls):
-        if not cls._instance:
-            cls._instance = super(MinerFactory, cls).__new__(cls)
-        return cls._instance
-
     async def get_miner_generator(self, ips: list):
         """
         Get Miner objects from ip addresses using an async generator.