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Default behavior has no effect; a delay or jitter must be supplied for the call to be non-degenerate. >>> bd = BackoffDelay() >>> bd() >>> bd() The following instance will delay 10ms for the first call, 20ms for the second, etc. >>> bd = BackoffDelay(delay=0.01, factor=2) >>> bd() >>> bd() Inspect and adjust the state of the delay anytime. >>> bd.delay 0.04 >>> bd.delay = 0.01 Set limit to prevent the delay from exceeding bounds. >>> bd = BackoffDelay(delay=0.01, factor=2, limit=0.015) >>> bd() >>> bd.delay 0.015 To reset the backoff, simply call ``.reset()``: >>> bd.reset() >>> bd.delay 0.01 Iterate on the object to retrieve/advance the delay values. >>> next(bd) 0.01 >>> next(bd) 0.015 >>> import itertools >>> tuple(itertools.islice(bd, 3)) (0.015, 0.015, 0.015) Limit may be a callable taking a number and returning the limited number. >>> at_least_one = lambda n: max(n, 1) >>> bd = BackoffDelay(delay=0.01, factor=2, limit=at_least_one) >>> next(bd) 0.01 >>> next(bd) 1 Pass a jitter to add or subtract seconds to the delay. >>> bd = BackoffDelay(jitter=0.01) >>> next(bd) 0 >>> next(bd) 0.01 Jitter may be a callable. To supply a non-deterministic jitter between -0.5 and 0.5, consider: >>> import random >>> jitter=functools.partial(random.uniform, -0.5, 0.5) >>> bd = BackoffDelay(jitter=jitter) >>> next(bd) 0 >>> 0 <= next(bd) <= 0.5 True � z#collections.abc.Callable[[], float]�jitterr �infr@ z0collections.abc.Callable[[float], float] | floatz+collections.abc.Callable[[], float] | floatr )�delay�limitrH r c sn || _ || _t|tj�r2|�ddd��fdd� }n|}|| _t|tj�r`|� dd�� fdd� }n|}|| _d S )Nr@ )�nr c s t dt� | ��S r )�max�min)rL )�limit_r r � limit_func� s z)BackoffDelay.__init__.<locals>.limit_funcr c s � S r r r )�jitter_r r � jitter_func s z*BackoffDelay.__init__.<locals>.jitter_func)rJ �factorr+ r, r- rK rH )r rJ rS rK rH rP rR r )rQ rO r r � s zBackoffDelay.__init__r c C s t �t| �� d S r )r �sleep�nextr r r r r8 s zBackoffDelay.__call__z int | floatc C s | j }| �� |S r )rJ �bump)r rJ r r r �__next__ s zBackoffDelay.__next__r c C s | S r r r r r r �__iter__ s zBackoffDelay.__iter__c C s | � | j| j | �� �| _d S r )rK rJ rS rH r r r r rV s zBackoffDelay.bumpc C s | j }| j|ji |j�� d S r )Z_saved___init__r r0 r1 )r Zsavedr r r r s zBackoffDelay.resetN)r& r' r( r) rS �__annotations__�jaracor5 Zsave_method_argsr@ r r8 rW rX rV r r r r r rF � s O� rF )� __future__r �collections.abc� collectionsr r r5 r, r �typesr �typingr Zjaraco.functoolsrZ �typing_extensionsr r r* r9 �abc�IteratorrF r r r r �<module> s E '
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