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(improvement) Skip tuple(partial(...)) construction for empty callbacks/errbacks (190ns saving per call - 63%) #803

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(improvement) Skip tuple(partial(...)) construction for empty callbacks/errbacks (190ns saving per call - 63%) #803

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34 changes: 22 additions & 12 deletions cassandra/cluster.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5431,16 +5431,21 @@ def _set_final_result(self, response):
# -- prevents case where _final_result is set, then a callback is
# added and executed on the spot, then executed again as a
# registered callback
to_call = tuple(
partial(fn, response, *args, **kwargs)
for (fn, args, kwargs) in self._callbacks
)
callbacks = self._callbacks
if callbacks:
to_call = tuple(
partial(fn, response, *args, **kwargs)
for (fn, args, kwargs) in callbacks
)
else:
to_call = None

self._event.set()

# apply each callback
for callback_partial in to_call:
callback_partial()
if to_call:
for callback_partial in to_call:
callback_partial()

def _set_final_exception(self, response):
self._cancel_timer()
Expand All @@ -5453,15 +5458,20 @@ def _set_final_exception(self, response):
# prevents case where _final_exception is set, then an errback is
# added and executed on the spot, then executed again as a
# registered errback
to_call = tuple(
partial(fn, response, *args, **kwargs)
for (fn, args, kwargs) in self._errbacks
)
errbacks = self._errbacks
if errbacks:
to_call = tuple(
partial(fn, response, *args, **kwargs)
for (fn, args, kwargs) in errbacks
)
else:
to_call = None
self._event.set()

# apply each callback
for callback_partial in to_call:
callback_partial()
if to_call:
for callback_partial in to_call:
callback_partial()

def _handle_retry_decision(self, retry_decision, response, host):

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