[svn] commit: r3091 - /branches/trac300/src/lib/python/isc/utils/rollback.py

[BIND 10 source code commits]

Author: vorner
Date: Thu Sep 30 20:06:29 2010
New Revision: 3091

Log:
Implemented the isc.util.rollback

Modified:
    branches/trac300/src/lib/python/isc/utils/rollback.py

Modified: branches/trac300/src/lib/python/isc/utils/rollback.py
==============================================================================
--- branches/trac300/src/lib/python/isc/utils/rollback.py (original)
+++ branches/trac300/src/lib/python/isc/utils/rollback.py Thu Sep 30 20:06:29 2010
@@ -31,14 +31,14 @@
     """
     def __init__(self):
         """A constructor."""
-        pass
+        self.__actions = []
 
     def __enter__(self):
         """
         Entry point to the context. It only returns itself, so it
         can be used in the with-as statement.
         """
-        pass
+        return self
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         """
@@ -46,10 +46,15 @@
         filled (eg. not None). Returns false (means the exception
         shouldn't be suppressed).
         """
-        pass
+        if exc_type is not None:
+            self.__actions.reverse()
+            for action in self.__actions:
+                action()
+            self.__actions = []
+        return False
 
     def add(self, action):
         """
         Records another rollback action.
         """
-        pass
+        self.__actions.append(action)