twisted.words.xish.utility.CallbackList

Container for callbacks.

Event queries are linked to lists of callables. When a matching event occurs, these callables are called in sequence. One-time callbacks are removed from the list after the first time the event was triggered.

Arguments to callbacks are split spread across two sets. The first set, callback specific, is passed to addCallback and is used for all subsequent event triggers. The second set is passed to callback and is event specific. Positional arguments in the second set come after the positional arguments of the first set. Keyword arguments in the second set override those in the first set.

Instance Variable	callbacks	The registered callbacks as mapping from the callable to a tuple of a wrapper for that callable that keeps the callback specific arguments and a boolean that signifies if it is to be called only once. (type: `dict`)
Method	__init__	Undocumented
Method	addCallback	Add callback.
Method	removeCallback	Remove callback.
Method	callback	Call all registered callbacks.
Method	isEmpty	Return if list of registered callbacks is empty.

callbacks =

The registered callbacks as mapping from the callable to a tuple of a wrapper for that callable that keeps the callback specific arguments and a boolean that signifies if it is to be called only once. (type: dict)

def __init__(self):

Undocumented

def addCallback(self, onetime, method, *args, **kwargs):

Add callback.

The arguments passed are used as callback specific arguments.

Parameters	onetime	If `True`, this callback is called at most once. (type: `bool`)
	method	The callback callable to be added.
	args	Positional arguments to the callable. (type: `list`)
	kwargs	Keyword arguments to the callable. (type: `dict`)

def removeCallback(self, method):

Remove callback.

Parameters method The callable to be removed.

def callback(self, *args, **kwargs):

Call all registered callbacks.

The passed arguments are event specific and augment and override the callback specific arguments as described above.

Parameters	args	Positional arguments to the callable. (type: `list`)
	kwargs	Keyword arguments to the callable. (type: `dict`)
Note	Exceptions raised by callbacks are trapped and logged. They will not propagate up to make sure other callbacks will still be called, and the event dispatching always succeeds.

def isEmpty(self):

Return if list of registered callbacks is empty.

Returns (type: bool)

API Documentation for twisted, generated by pydoctor at 2020-03-25 17:34:30.

twisted.words.xish.utility.CallbackList class documentation

`twisted.words.xish.utility.CallbackList` class documentation