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Questions as title, this is source code. Version 9.0.0
class wait_exponential_jitter(wait_base):
"""Wait strategy that applies exponential backoff and jitter.
It allows for a customized initial wait, maximum wait and jitter.
This implements the strategy described here:
https://cloud.google.com/storage/docs/retry-strategy
The wait time is min(initial * 2**n + random.uniform(0, jitter), maximum)
where n is the retry count.
"""
def __init__(
self,
initial: float = 1,
max: float = _utils.MAX_WAIT, # noqa
exp_base: float = 2,
jitter: float = 1,
) -> None:
self.initial = initial
self.max = max
self.exp_base = exp_base
self.jitter = jitter
def __call__(self, retry_state: "RetryCallState") -> float:
jitter = random.uniform(0, self.jitter)
try:
exp = self.exp_base ** (retry_state.attempt_number - 1)
result = self.initial * exp + jitter
except OverflowError:
result = self.max
return max(0, min(result, self.max))
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