1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
# Copyright (C) 2006-2007 by the Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.
# A transaction wrapping decorator. The basic idea is that methods in the
# DBContext that need to operate on transaction boundaries can be written to
# be transaction naive. By wrapping them in this decorator, they
# automatically become transaction safe.
class txn(object):
def __init__(self, func):
# func is a function object, not a method (even an unbound method).
self._func = func
def __get__(self, obj, type=None):
# Return a wrapper function that creates a bound method from the
# function, then calls it wrapped in a transaction boundary. Uses a
# non-public method called _withtxn() in the object's class.
def wrapper(*args, **kws):
return obj._withtxn(self._func.__get__(obj), *args, **kws)
return wrapper
|
