class based singleton for SharedPool

2010-07-26 12:49:21 -07:00
parent a8fd36c867
commit b72e1ef1e8
2 changed files with 8 additions and 7 deletions
--- a/nova/process.py
+++ b/nova/process.py
@@ -205,12 +205,13 @@ class ProcessPool(object):
        self._pool.release()
        return rv

-_instance = None
-def SharedPool():
-    global _instance
-    if _instance is None:
-       _instance = ProcessPool()
-    return _instance
+class SharedPool(object):
+    _instance = None
+    def __init__(self):
+        if SharedPool._instance is None:
+            self.__class__._instance = ProcessPool()
+    def __getattr__(self, key):
+        return getattr(self._instance, key)

 def simple_execute(cmd, **kwargs):
    return SharedPool().simple_execute(cmd, **kwargs)