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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
# copied from foolscap
from twisted.internet import reactor, defer
from twisted.python import log
class _SimpleCallQueue(object):
_reactor = reactor
def __init__(self):
self._events = []
self._flushObservers = []
self._timer = None
self._in_turn = False
def append(self, cb, args, kwargs):
self._events.append((cb, args, kwargs))
if not self._timer:
self._timer = self._reactor.callLater(0, self._turn)
def _turn(self):
self._timer = None
self._in_turn = True
# flush all the messages that are currently in the queue. If anything
# gets added to the queue while we're doing this, those events will
# be put off until the next turn.
events, self._events = self._events, []
for cb, args, kwargs in events:
try:
cb(*args, **kwargs)
except:
log.err()
self._in_turn = False
if self._events and not self._timer:
self._timer = self._reactor.callLater(0, self._turn)
if not self._events:
observers, self._flushObservers = self._flushObservers, []
for o in observers:
o.callback(None)
def flush(self):
if not self._events and not self._in_turn:
return defer.succeed(None)
d = defer.Deferred()
self._flushObservers.append(d)
return d
_theSimpleQueue = _SimpleCallQueue()
def eventually(cb, *args, **kwargs):
_theSimpleQueue.append(cb, args, kwargs)
def fireEventually(value=None):
d = defer.Deferred()
eventually(d.callback, value)
return d
def flushEventualQueue(_ignored=None):
return _theSimpleQueue.flush()
def _setReactor(r=None):
# This sets the reactor used to schedule future events to r. If r is None
# (the default), the reactor is reset to its default value.
# This should only be used for unit tests.
if r is None:
r = reactor
_theSimpleQueue._reactor = r
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