class Application(model.ModelEntity):
+ @property
+ def _unit_match_pattern(self):
+ return r'^{}.*$'.format(self.entity_id)
+
+ def on_unit_add(self, callable_):
+ """Add a "unit added" observer to this entity, which will be called
+ whenever a unit is added to this application.
+
+ """
+ self.model.add_observer(
+ callable_, 'unit', 'add', self._unit_match_pattern)
+
+ def on_unit_remove(self, callable_):
+ """Add a "unit removed" observer to this entity, which will be called
+ whenever a unit is removed from this application.
+
+ """
+ self.model.add_observer(
+ callable_, 'unit', 'remove', self._unit_match_pattern)
+
@property
def units(self):
return [