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from __future__ import absolute_import, print_function
__all__ = [
'callback',
]
# For times when *args is captured but often not passed (empty),
# we can avoid keeping the new tuple that was created for *args
# around by using a constant.
_NOARGS = ()
class callback(object):
__slots__ = ('callback', 'args')
def __init__(self, cb, args):
self.callback = cb
self.args = args or _NOARGS
def stop(self):
self.callback = None
self.args = None
close = stop
# Note that __nonzero__ and pending are different
# bool() is used in contexts where we need to know whether to schedule another callback,
# so it's true if it's pending or currently running
# 'pending' has the same meaning as libev watchers: it is cleared before actually
# running the callback
def __nonzero__(self):
# it's nonzero if it's pending or currently executing
# NOTE: This depends on loop._run_callbacks setting the args property
# to None.
return self.args is not None
__bool__ = __nonzero__
@property
def pending(self):
return self.callback is not None
def _format(self):
return ''
def __repr__(self):
result = "<%s at 0x%x" % (self.__class__.__name__, id(self))
if self.pending:
result += " pending"
if self.callback is not None:
result += " callback=%r" % (self.callback, )
if self.args is not None:
result += " args=%r" % (self.args, )
if self.callback is None and self.args is None:
result += " stopped"
return result + ">"
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