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# This file is part of Buildbot. Buildbot 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, version 2.
#
# 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.
#
# Copyright Buildbot Team Members
"""
Miscellaneous utilities; these should be imported from C{buildbot.util}, not
directly from this module.
"""
from twisted.python import log
from twisted.internet import defer
def deferredLocked(lock_or_attr):
def decorator(fn):
def wrapper(*args, **kwargs):
lock = lock_or_attr
if isinstance(lock, basestring):
lock = getattr(args[0], lock)
return lock.run(fn, *args, **kwargs)
return wrapper
return decorator
class SerializedInvocation(object):
def __init__(self, method):
self.method = method
self.running = False
self.pending_deferreds = []
def __call__(self):
d = defer.Deferred()
self.pending_deferreds.append(d)
if not self.running:
self.start()
return d
def start(self):
self.running = True
invocation_deferreds = self.pending_deferreds
self.pending_deferreds = []
d = self.method()
d.addErrback(log.err, 'in invocation of %r' % (self.method,))
def notify_callers(_):
for d in invocation_deferreds:
d.callback(None)
d.addCallback(notify_callers)
def next(_):
self.running = False
if self.pending_deferreds:
self.start()
else:
self._quiet()
d.addBoth(next)
def _quiet(self): # hook for tests
pass
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