Make EventHandlerBase capable of stopping all it's instances

lib/tfw/event_handlers/event_handler_base.py

@@ -1,5 +1,4 @@
 import logging
-from inspect import currentframe
 from typing import Iterable
 
 LOG = logging.getLogger(__name__)
@@ -12,7 +11,10 @@ class EventHandlerBase:
 
     Derived classes must implement the handle_event() method
     """
+    _instances = set()
+
     def __init__(self, key, server_connector, scope):
+        type(self)._instances.add(self)
         self.server_connector = server_connector
         self.scope = scope
         self.keys = []
@@ -92,6 +94,11 @@ class EventHandlerBase:
             self.server_connector.unsubscribe(key)
             self.keys.remove(key)
 
+    @classmethod
+    def stop_all_instances(cls):
+        for instance in cls._instances:
+            instance.stop()
+
     def stop(self):
         self.server_connector.close()
         self.cleanup()
@@ -101,15 +108,3 @@ class EventHandlerBase:
         Perform cleanup actions such as releasing database
         connections and stuff like that.
         """
-
-    @classmethod
-    def get_local_instances(cls):
-        frame = currentframe()
-        if frame is None:
-            raise EnvironmentError('inspect.currentframe() is not supported!')
-
-        locals_values = frame.f_back.f_locals.values()
-        return {
-            instance for instance in locals_values
-            if isinstance(instance, cls)
-        }