backends: Add refresh_task to the Backend interface

diff --git a/tasklib/backends.py b/tasklib/backends.py
index e7b9a74f4adf2c5d6627e21aba2eeb6f4b77ad5f..bf4cd67cd75e69cf2a3200f500636c84f2d78323 100644 (file)
--- a/tasklib/backends.py
+++ b/tasklib/backends.py
@@ -42,6 +42,14 @@ class Backend(object):
     def complete_task(self, task):
         pass
 
+    @abc.abstractmethod
+    def refresh_task(self, task):
+        """
+        Refreshes the given task. Returns new data dict with serialized
+        attributes.
+        """
+        pass
+
     @abc.abstractmethod
     def sync(self):
         """Syncs the backend database with the taskd server"""