From 7996a1358184552db6ab4f69c127336b2b794d47 Mon Sep 17 00:00:00 2001
From: Iustin Pop <iustin@google.com>
Date: Thu, 10 Jul 2008 12:17:52 +0000
Subject: [PATCH] Add a simple decorator for instance methods
This is just a simple, hardcoded decorator for object methods needing
synchronization on the _lock instance attribute.
Reviewed-by: ultrotter
---
lib/jqueue.py | 1 +
lib/utils.py | 19 +++++++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/lib/jqueue.py b/lib/jqueue.py
index 6bc02a270..d96094ea8 100644
--- a/lib/jqueue.py
+++ b/lib/jqueue.py
@@ -28,6 +28,7 @@ from ganeti import constants
from ganeti import workerpool
from ganeti import errors
from ganeti import mcpu
+from ganeti import utils
JOBQUEUE_THREADS = 5
diff --git a/lib/utils.py b/lib/utils.py
index 5e4233a05..33bf83f3b 100644
--- a/lib/utils.py
+++ b/lib/utils.py
@@ -1063,3 +1063,22 @@ def CheckVolumeGroupSize(vglist, vgname, minsize):
return ("volume group '%s' too small (%s MiB required, %d MiB found)" %
(vgname, minsize, vgsize))
return None
+
+
+def LockedMethod(fn):
+ """Synchronized object access decorator.
+
+ This decorator is intended to protect access to an object using the
+ object's own lock which is hardcoded to '_lock'.
+
+ """
+ def wrapper(self, *args, **kwargs):
+ assert hasattr(self, '_lock')
+ lock = self._lock
+ lock.acquire()
+ try:
+ result = fn(self, *args, **kwargs)
+ finally:
+ lock.release()
+ return result
+ return wrapper
--
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