Author: dmeyer
Date: Tue Jan 23 13:17:57 2007
New Revision: 2438
Modified:
trunk/base/src/utils.py
Log:
add Singleton class
Modified: trunk/base/src/utils.py
==============================================================================
--- trunk/base/src/utils.py (original)
+++ trunk/base/src/utils.py Tue Jan 23 13:17:57 2007
@@ -183,3 +183,32 @@
run.write(str(os.getpid()) + '\n')
run.write(cmdline)
run.close()
+
+
+class Singleton(object):
+ """
+ Create Singleton object from classref on demand.
+ """
+
+ class Memberfunction(object):
+ def __init__(self, singleton, name):
+ self._singleton = singleton
+ self._name = name
+
+ def __call__(self, *args, **kwargs):
+ return getattr(self._singleton(), self._name)(*args, **kwargs)
+
+
+ def __init__(self, classref):
+ self._singleton = None
+ self._class = classref
+
+ def __call__(self):
+ if self._singleton is None:
+ self._singleton = self._class()
+ return self._singleton
+
+ def __getattr__(self, attr):
+ if self._singleton is None:
+ return Singleton.Memberfunction(self, attr)
+ return getattr(self, _singleton, attr)
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