twisted.persisted.crefutil._Defer : API documentation

Method	__init__	Initialize a `Deferred`.
Method	__setitem__	Undocumented
Method	addDependant	Undocumented

Inherited from Deferred:

Instance Variable	called	A flag which is `False` until either `callback` or `errback` is called and afterwards always `True`. (type: `bool`)
Instance Variable	paused	A counter of how many unmatched `pause` calls have been made on this instance. (type: `int`)
Method	addCallbacks	Add a pair of callbacks (success and error) to this `Deferred`.
Method	addCallback	Convenience method for adding just a callback.
Method	addErrback	Convenience method for adding just an errback.
Method	addBoth	Convenience method for adding a single callable as both a callback and an errback.
Method	chainDeferred	Chain another `Deferred` to this `Deferred`.
Method	callback	Run all success callbacks that have been added to this `Deferred`.
Method	errback	Run all error callbacks that have been added to this `Deferred`.
Method	pause	Stop processing on a `Deferred` until `unpause`() is called.
Method	unpause	Process all callbacks made since `pause`() was called.
Method	cancel	Cancel this `Deferred`.
Method	__str__	Return a string representation of this `Deferred`.
Instance Variable	_suppressAlreadyCalled	A flag used by the cancellation mechanism which is `True` if the Deferred has no canceller and has been cancelled, `False` otherwise. If `True`, it can be expected that `callback` or `errback` will eventually be called and the result should be silently discarded. (type: `bool`)
Instance Variable	_runningCallbacks	A flag which is `True` while this instance is executing its callback chain, used to stop recursive execution of `_runCallbacks` (type: `bool`)
Instance Variable	_chainedTo	If this Deferred is waiting for the result of another Deferred, this is a reference to the other Deferred. Otherwise, `None`.
Method	_startRunCallbacks	Undocumented
Method	_continuation	Build a tuple of callback and errback with `_continue` to be used by `_addContinue` and `_removeContinue` on another Deferred.
Method	_runCallbacks	Run the chain of callbacks once a result is available.

Inherited from NotKnown:

Method	resolveDependants	Undocumented
Method	__hash__	Undocumented

def __init__(self): (source)

overrides twisted.internet.defer.Deferred.__init__

Initialize a Deferred.

Parameters

canceller

a callable used to stop the pending operation scheduled by this Deferred when Deferred.cancel is invoked. The canceller will be passed the deferred whose cancelation is requested (i.e., self).

If a canceller is not given, or does not invoke its argument's callback or errback method, Deferred.cancel will invoke Deferred.errback with a CancelledError.

Note that if a canceller is not given, callback or errback may still be invoked exactly once, even though defer.py will have already invoked errback, as described above. This allows clients of code which returns a Deferred to cancel it without requiring the Deferred instantiator to provide any specific implementation support for cancellation. New in 10.1.

(type: a 1-argument callable which takes a Deferred. The return result is ignored.)

t.p.c._Defer(Deferred, NotKnown) : class documentation