A concrete implementation subclass 'SyncStorage' derives from this abstract class.
"""
+ @abstractmethod
+ def is_active(self):
+ """
+ Verify SDL storage healthiness.
+
+ Verify SDL connection to the backend data storage.
+
+ Args:
+ None
+
+ Returns:
+ bool: True if SDL is operational, false otherwise.
+
+ Raises:
+ None
+ """
+ pass
+
@abstractmethod
def close(self):
"""