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# The contents of this file are subject to the BitTorrent Open Source License
# Version 1.1 (the License). You may not copy or use this file, in either
# source code or executable form, except in compliance with the License. You
# may obtain a copy of the License at http://www.bittorrent.com/license/.
#
# Software distributed under the License is distributed on an AS IS basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
class Deferred(object):
def __init__(self):
self.callbacks = []
self.errbacks = []
self.calledBack = False
self.erredBack = False
self.results = []
self.failures = []
def addCallback(self, cb, args=(), kwargs={}):
assert callable(cb)
self.callbacks.append((cb, args, kwargs))
if self.calledBack:
self.doCallbacks(self.results, [(cb, args, kwargs)])
return self
def addErrback(self, cb, args=(), kwargs={}):
assert callable(cb)
self.errbacks.append((cb, args, kwargs))
if self.erredBack:
self.doCallbacks(self.failures, [(cb, args, kwargs)])
return self
def addCallbacks(self, cb, eb, args=(), kwargs={},
ebargs=(), ebkwargs={}):
assert callable(cb)
assert callable(eb)
self.addCallback(cb, args, kwargs)
self.addErrback(eb, ebargs, ebkwargs)
def callback(self, result):
self.results.append(result)
self.calledBack = True
if self.callbacks:
self.doCallbacks([result], self.callbacks)
def errback(self, failed):
self.failures.append(failed)
self.erredBack = True
if self.errbacks:
self.doCallbacks([failed], self.errbacks)
def doCallbacks(self, results, callbacks):
for result in results:
for cb, args, kwargs in callbacks:
result = cb(result, *args, **kwargs)
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