[CalendarServer-changes] [10248] CalendarServer/branches/users/glyph/queue-locking-and-timing

[source_changes at macosforge.org]

Revision: 10248
          http://trac.calendarserver.org//changeset/10248
Author:   glyph at apple.com
Date:     2013-01-04 16:39:06 -0800 (Fri, 04 Jan 2013)
Log Message:
-----------
Sometimes, things need to clean up database state before the transaction is committed.  Extend the IAsyncTransaction interface to let them do so.

Modified Paths:
--------------
    CalendarServer/branches/users/glyph/queue-locking-and-timing/twext/enterprise/ienterprise.py

Property Changed:
----------------
    CalendarServer/branches/users/glyph/queue-locking-and-timing/

Modified: CalendarServer/branches/users/glyph/queue-locking-and-timing/twext/enterprise/ienterprise.py
===================================================================
--- CalendarServer/branches/users/glyph/queue-locking-and-timing/twext/enterprise/ienterprise.py	2013-01-05 00:39:05 UTC (rev 10247)
+++ CalendarServer/branches/users/glyph/queue-locking-and-timing/twext/enterprise/ienterprise.py	2013-01-05 00:39:06 UTC (rev 10248)
@@ -113,6 +113,19 @@
         """
 
 
+    def preCommit(operation):
+        """
+        Perform the given operation when this L{IAsyncTransaction}'s C{commit}
+        method is called, but before the underlying transaction commits.  If
+        any exception is raised by this operation, underlying database commit
+        will be blocked and rollback run instead.
+
+        @param operation: a 0-argument callable that may return a L{Deferred}.
+            If it does, then the subsequent operations added by L{postCommit}
+            will not fire until that L{Deferred} fires.
+        """
+
+
     def postCommit(operation):
         """
         Perform the given operation only after this L{IAsyncTransaction}
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