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