/usr/lib/python2.7/dist-packages/paramiko/resource.py is in python-paramiko 1.10.1-1git1ubuntu0.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This file is part of paramiko.
#
# Paramiko is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#
# Paramiko is distrubuted in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
# A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Paramiko; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
"""
Resource manager.
"""
import weakref
class ResourceManager (object):
"""
A registry of objects and resources that should be closed when those
objects are deleted.
This is meant to be a safer alternative to python's C{__del__} method,
which can cause reference cycles to never be collected. Objects registered
with the ResourceManager can be collected but still free resources when
they die.
Resources are registered using L{register}, and when an object is garbage
collected, each registered resource is closed by having its C{close()}
method called. Multiple resources may be registered per object, but a
resource will only be closed once, even if multiple objects register it.
(The last object to register it wins.)
"""
def __init__(self):
self._table = {}
def register(self, obj, resource):
"""
Register a resource to be closed with an object is collected.
When the given C{obj} is garbage-collected by the python interpreter,
the C{resource} will be closed by having its C{close()} method called.
Any exceptions are ignored.
@param obj: the object to track
@type obj: object
@param resource: the resource to close when the object is collected
@type resource: object
"""
def callback(ref):
try:
resource.close()
except:
pass
del self._table[id(resource)]
# keep the weakref in a table so it sticks around long enough to get
# its callback called. :)
self._table[id(resource)] = weakref.ref(obj, callback)
# singleton
ResourceManager = ResourceManager()
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