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# Copyright (C) 2005 Canonical Ltd
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
__all__ = ['needs_read_lock',
'needs_write_lock',
]
def needs_read_lock(unbound):
"""Decorate unbound to take out and release a read lock.
This decorator can be applied to methods of any class with lock_read() and
unlock() methods.
Typical usage:
class Branch(...):
@needs_read_lock
def branch_method(self, ...):
stuff
"""
def read_locked(self, *args, **kwargs):
self.lock_read()
try:
return unbound(self, *args, **kwargs)
finally:
self.unlock()
read_locked.__doc__ = unbound.__doc__
read_locked.__name__ = unbound.__name__
return read_locked
def needs_write_lock(unbound):
"""Decorate unbound to take out and release a write lock."""
def write_locked(self, *args, **kwargs):
self.lock_write()
try:
return unbound(self, *args, **kwargs)
finally:
self.unlock()
write_locked.__doc__ = unbound.__doc__
write_locked.__name__ = unbound.__name__
return write_locked
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