/usr/share/pyshared/insanity/storage/async.py is in python-insanity 0.0+git20110920.4750a8e8-2.
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#
# storage/async.py
#
# Copyright (c) 2008, Edward Hervey <bilboed@bilboed.com>
#
# This program 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.
#
# 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
"""
Asynchronous storage interface
"""
from insanity.threads import ActionQueueThread
class queuemethod(object):
def __init__(self, fn):
self.fn = fn
def __get__(self, obj, klass=None):
def wrapper(*args, **kwargs):
if obj._async:
obj.queueAction(self.fn, obj, *args, **kwargs)
else:
self.fn(obj, *args, **kwargs)
return wrapper
class finalqueuemethod(object):
def __init__(self, fn):
self.fn = fn
def __get__(self, obj, klass=None):
def wrapper(*args, **kwargs):
if obj._async:
obj.queueFinalAction(self.fn, obj, *args, **kwargs)
else:
self.fn(obj, *args, **kwargs)
return wrapper
class AsyncStorage:
"""
Interface for asynchronous storing Storage
"""
def __init__(self, async=True):
self._async = async
if self._async:
self._actionthread = ActionQueueThread()
self._actionthread.start()
@property
def async(self):
"""True if write operations are asynchronous"""
return self._async
def queueAction(self, cb, *args, **kwargs):
if self._async:
self._actionthread.queueAction(cb, *args, **kwargs)
def queueFinalAction(self, cb, *args, **kwargs):
if self._async:
self._actionthread.queueFinalAction(cb, *args, **kwargs)
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