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