Mercurial > libervia-backend
view src/memory/persistent.py @ 604:16a9affc49cf
plugin export command: first draft
this plugin allow to export the stdin/stdout/stderr of a process to a contact
author | Goffi <goffi@goffi.org> |
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date | Fri, 22 Feb 2013 00:22:50 +0100 |
parents | e5a875a3311b |
children | 84a6e83157c2 |
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#!/usr/bin/python # -*- coding: utf-8 -*- """ SAT: a jabber client Copyright (C) 2009, 2010, 2011, 2012, 2013 Jérôme Poisson (goffi@goffi.org) This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed 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 Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. """ from logging import debug, info, warning, error class MemoryNotInitializedError(Exception): pass class PersistentDict(object): r"""A dictionary which save persistently each value assigned /!\ be careful, each assignment means a database write /!\ Memory must be initialised before loading/setting value with instances of this class""" storage = None def __init__(self, namespace, profile=None): """@param namespace: unique namespace for this dictionary @param profile: profile which *MUST* exists, or None for general values""" if not self.storage: error(_("PersistentDict can't be used before memory initialisation")) raise MemoryNotInitializedError self._cache = {} self.namespace = namespace self.profile = profile def load(self): """load persistent data from storage """ if not self.profile: return self.storage.loadGenPrivates(self._cache, self.namespace) else: return self.storage.loadIndPrivates(self._cache, self.namespace, self.profile) def __repr__(self): return self._cache.__repr__() def __str__(self): return self._cache.__str__() def __lt__(self, other): return self._cache.__lt__(other) def __le__(self, other): return self._cache.__le__(other) def __eq__(self, other): return self._cache.__eq__(other) def __ne__(self, other): return self._cache.__ne__(other) def __gt__(self, other): return self._cache.__gt__(other) def __ge__(self, other): return self._cache.__ge__(other) def __cmp__(self, other): return self._cache.__cmp__(other) def __hash__(self): return self._cache.__hash__() def __nonzero__(self): return self._cache.__len__() def __contains__(self, key): return self._cache.__contains__(key) def __getitem__(self, key): return self._cache.__getitem__(key) def __setitem__(self, key, value): if not self.profile: self.storage.setGenPrivate(self.namespace, key, value) else: self.storage.setIndPrivate(self.namespace, key, value, self.profile) return self._cache.__setitem__(key, value) def __delitem__(self, key): if not self.profile: self.storage.delGenPrivate(self.namespace, key) else: self.storage.delIndPrivate(self.namespace, key, self.profile) return self._cache.__delitem__(key) def get(self, key, default=None): return self._cache.get(key, default) def force(self, name): """Force saving of an attribute to storage @return: deferred fired when data is actually saved""" if not self.profile: return self.storage.setGenPrivate(self.namespace, name, self._cache[name]) return self.storage.setIndPrivate(self.namespace, name, self._cache[name], self.profile) class PersistentBinaryDict(PersistentDict): """Persistent dict where value can be any python data (instead of string only)""" def load(self): """load persistent data from storage """ if not self.profile: return self.storage.loadGenPrivatesBinary(self._cache, self.namespace) else: return self.storage.loadIndPrivatesBinary(self._cache, self.namespace, self.profile) def __setitem__(self, key, value): if not self.profile: self.storage.setGenPrivateBinary(self.namespace, key, value) else: self.storage.setIndPrivateBinary(self.namespace, key, value, self.profile) return self._cache.__setitem__(key, value) def __delitem__(self, key): if not self.profile: self.storage.delGenPrivateBinary(self.namespace, key) else: self.storage.delIndPrivateBinary(self.namespace, key, self.profile) return self._cache.__delitem__(key) def force(self, name): """Force saving of an attribute to storage @return: deferred fired when data is actually saved""" if not self.profile: return self.storage.setGenPrivateBinary(self.namespace, name, self._cache[name]) return self.storage.setIndPrivateBinary(self.namespace, name, self._cache[name], self.profile)