X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=myslice%2Fconfigengine.py;h=c8ff19730b8074aaf6283470453af13f45e6a1e2;hb=ddcdaf8d61df7f4a2a0da11c23190b56ed914464;hp=6341ac3273b56e00915e1793c0a0434fb86a705d;hpb=982d5620e23e337b2a228d4bf8ed379ea632b414;p=myslice.git

diff --git a/myslice/configengine.py b/myslice/configengine.py
index 6341ac32..c8ff1973 100644
--- a/myslice/configengine.py
+++ b/myslice/configengine.py
@@ -19,7 +19,25 @@ from myslice.settings import ROOT
 #api_key=theapikeyasprovidedbygoogle
 
 # use a singleton instead of staticmethods
-from myslice.util.singleton    import Singleton
+#-------------------------------------------------------------------------
+# Class Singleton
+#
+# Classes that inherit from Singleton can be instanciated only once 
+#-------------------------------------------------------------------------
+
+class Singleton(type):
+    def __init__(cls, name, bases, dic):
+        super(Singleton,cls).__init__(name,bases,dic)
+        cls.instance=None
+
+    def __call__(cls, *args, **kw):
+        if cls.instance is None:
+            cls.instance=super(Singleton,cls).__call__(*args,**kw)
+        return cls.instance
+
+
+# See also
+# http://stackoverflow.com/questions/6760685/creating-a-singleton-in-python
 
 class ConfigEngine(object):
     __metaclass__ = Singleton