will be used by management code Signed-off-by: YAMAMOTO Takashi <yamam...@valinux.co.jp> --- ryu/instance_registry.py | 94 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 ryu/instance_registry.py
diff --git a/ryu/instance_registry.py b/ryu/instance_registry.py new file mode 100644 index 0000000..a98bc75 --- /dev/null +++ b/ryu/instance_registry.py @@ -0,0 +1,94 @@ +# Copyright (C) 2013 Nippon Telegraph and Telephone Corporation. +# Copyright (C) 2013 YAMAMOTO Takashi <yamamoto 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. + +import weakref + + +class InstanceRegistry(type): + def __new__(cls, name, bases, dict): + def unregister(self): + for i, r in enumerate(self._instances): + v = r() + if v is None or v is self: + self._instances.pop(i) + if v is self: + break + dict['_instances'] = [] + dict['instance_registry_unregister'] = unregister + return type.__new__(cls, name, bases, dict) + + def __call__(self, *args): + i = type.__call__(self, *args) + self._instances.append(weakref.ref(i)) + return i + + def __iter__(self): + class Iter(object): + def __init__(self, iter): + self.iter = iter + + def __iter__(self): + return self + + def next(self): + while True: + r = self.iter.next() + v = r() + if not v is None: + break + return v + + return Iter(iter(self._instances)) + + +if __name__ == '__main__': + class A(object): + __metaclass__ = InstanceRegistry + + def __init__(self, name): + self.name = name + + def __repr__(self): + return self.name + + class B(A): + pass + + a = A("a1") + b = B("b1") + + print a, b + + print "iterate A" + for i in A: + print i + print "iterate B" + for i in B: + print i + +# del a +# del b +# del i +# import gc +# gc.collect() + + a.instance_registry_unregister() + print "iterate A" + for i in A: + print i + print "iterate B" + for i in B: + print i -- 1.8.0.1 ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar _______________________________________________ Ryu-devel mailing list Ryu-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ryu-devel
