Limnoria/src/utils/python.py

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###
# Copyright (c) 2005, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
import types
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import threading
def changeFunctionName(f, name, doc=None):
if doc is None:
doc = f.__doc__
newf = types.FunctionType(f.func_code, f.func_globals, name,
f.func_defaults, f.func_closure)
newf.__doc__ = doc
return newf
class Object(object):
def __ne__(self, other):
return not self == other
class TupleSubclass(type):
def __new__(cls, name, bases, dict):
assert tuple in bases
assert '__attrs__' in dict
for (i, attr) in enumerate(dict['__attrs__']):
dict[attr] = property(lambda self, i=i: self[i])
del dict['__attrs__']
# XXX Check the length of the iterable given.
return super(TupleSubclass, cls).__new__(cls, name, bases, dict)
class Acquire(object):
# Mixin for acquiring attributes from parents.
def __init__(self, attr):
self.__parent = attr
def __getattr__(self, attr):
return getattr(self.__parent, attr)
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class Synchronized(type):
def __new__(cls, name, bases, dict):
sync = set()
for base in bases:
if hasattr(base, '__synchronized__'):
sync.update(base.__synchronized__)
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if '__synchronized__' in dict:
sync.update(dict['__synchronized__'])
if sync:
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def synchronized(f):
def g(self, *args, **kwargs):
self._Synchronized_rlock.acquire()
try:
f(self, *args, **kwargs)
finally:
self._Synchronized_rlock.release()
return changeFunctionName(g, f.func_name, f.__doc__)
for attr in sync:
if attr in dict:
dict[attr] = synchronized(dict[attr])
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original__init__ = dict.get('__init__')
def __init__(self, *args, **kwargs):
if not hasattr(self, '_Synchronized_rlock'):
self._Synchronized_rlock = threading.RLock()
if original__init__:
original__init__(self, *args, **kwargs)
else:
# newclass is defined below.
super(newclass, self).__init__(*args, **kwargs)
dict['__init__'] = __init__
newclass = super(Synchronized, cls).__new__(cls, name, bases, dict)
return newclass
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: