b880efba3e
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@3794 fd906abe-77d9-0310-91a1-e0d9ade77398
60 lines
1.6 KiB
Python
60 lines
1.6 KiB
Python
#
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# Copyright (c) 2010 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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A simple mechanism for caching values in the request.
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$Id$
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"""
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INVALID = object()
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def caching(self, method, id):
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annot = self.request.annotations
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item = annot.setdefault('cybertools.zutil.rcache', {})
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value = item.get(id, INVALID)
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if value is INVALID:
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value = method(self)
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item[id] = value
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return value
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def requestCache(method):
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def _cache(self):
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return caching(self, method, method.__name__)
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return _cache
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rcache = requestCache
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class requestCacheProperty(object):
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def __init__(self, func):
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self.func = func
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def __get__(self, inst, class_):
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if inst is None:
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return self
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id = self.func.__name__
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value = caching(inst, self.func, id)
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inst.__dict__[id] = value
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return value
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rcacheproperty = requestCacheProperty
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