1 files changed, 0 insertions, 48 deletions
diff --git a/ryu/lib/track_instances.py b/ryu/lib/track_instances.py
deleted file mode 100644
index 1761d58a..00000000
--- a/ryu/lib/track_instances.py
+++ /dev/null
@@ -1,48 +0,0 @@
-# Copyright (C) 2012 Isaku Yamahata <yamahata at valinux co jp>
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
-# implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# This is mixin class to track instances of a given class
-#
-# http://docs.python.org/faq/programming.html#how-do-i-get-a-list-of-all-instances-of-a-given-class
-# How do I get a list of all instances of a given class?
-# Python does not keep track of all instances of a class (or of a
-# built-in type). You can program the class's constructor to keep
-# track of all instances by keeping a list of weak references to each
-# instance.
-
-from collections import defaultdict
-
-# Although WeakSet can be used directory, WeakValueDictionary is used instead
-# for python 2.6 which is used by REHL6 because WeakSet is supported by
-# python 2.7+.
-# Correspondence:
-# wvd = WeakValueDictionary()           ws = WeakSet()
-# wvd[id(value)] = value                ws = value
-# wvd.values()                          ws: iterator
-
-from weakref import WeakValueDictionary
-
-
-class TrackInstances(object):
-    # weak reference is needed in order to make instances freeable by avoiding
-    # refrence count. Otherwise, instances will never be freed.
-    __refs__ = defaultdict(WeakValueDictionary)
-
-    def __init__(self):
-        self.__refs__[self.__class__][id(self)] = self
-
-    @classmethod
-    def all_instances(cls):
-        return cls.__refs__[cls].values()