Introduce event_name property

The event_name is typically set manually as a class attribute and
the value is the same as the class name. That requires to re-set the
class attribute whenever a new subclass is created.

The patch makes the event_name a property that always calls to its own
class name so we do not need to explicitly name the event.

If a different name than the class name is needed, we can always
override the property itself.

Change-Id: I1a62a2e1b4f4aeecf0ec9698f7b55ed0bed73a5a
Signed-off-by: Jakub Libosvar <libosvar@redhat.com>

ovsdbapp/event.py

@@ -36,7 +36,6 @@ class RowEvent(object, metaclass=abc.ABCMeta):
     ROW_UPDATE = "update"
     ROW_DELETE = "delete"
     ONETIME = False
-    event_name = 'RowEvent'
     priority = 20
 
     def __init__(self, events, table, conditions, old_conditions=None):
@@ -85,9 +84,18 @@ class RowEvent(object, metaclass=abc.ABCMeta):
     def run(self, event, row, old):
         """Method to run when the event matches"""
 
+    @property
+    def event_name(self):
+        if not hasattr(self, '_event_name'):
+            return self.__class__.__name__
+        return self._event_name
+
+    @event_name.setter
+    def event_name(self, value):
+        self._event_name = value
+
 
 class WaitEvent(RowEvent):
-    event_name = 'WaitEvent'
     ONETIME = True
     priority = 10
 

ovsdbapp/tests/functional/schema/ovn_southbound/event.py

@@ -14,8 +14,6 @@ from ovsdbapp.backend.ovs_idl import event
 
 
 class WaitForPortBindingEvent(event.WaitEvent):
-    event_name = 'WaitForPortBindingEvent'
-
     def __init__(self, port, timeout=5):
         super(WaitForPortBindingEvent, self).__init__(
             (self.ROW_CREATE,), 'Port_Binding', (('logical_port', '=', port),),