o NDiM@s>dZddlZddlZddlmZeeZGdddeZ dS)zc This module contains utilities for generating timestamps for client-side timestamp specification. N)Lockc@sDeZdZdZdZ dZ dZ d ddZddZdd Z d d Z d S)MonotonicTimestampGeneratoras An object that, when called, returns ``int(time.time() * 1e6)`` when possible, but, if the value returned by ``time.time`` doesn't increase, drifts into the future and logs warnings. Exposed configuration attributes can be configured with arguments to ``__init__`` or by changing attributes on an initialized object. .. versionadded:: 3.8.0 TcCsPt|_|jd|_d|_Wdn1swY||_||_||_dS)Nr)rlocklast _last_warn warn_on_driftwarning_thresholdwarning_interval)selfrr r r M/var/www/Datamplify/venv/lib/python3.10/site-packages/cassandra/timestamps.py__init__8s z$MonotonicTimestampGenerator.__init__cCs.||kr ||_|S|j|d|d|_|jS)a4 Returns the timestamp that should be used if ``now`` is the current time and ``last`` is the last timestamp returned by this object. Intended for internal and testing use only; to generate timestamps, call an instantiated ``MonotonicTimestampGenerator`` object. :param int now: an integer to be used as the current time, typically representing the current time in microseconds since the UNIX epoch :param int last: an integer representing the last timestamp returned by this object )nowr)r _maybe_warn)r rrr r r _next_timestampAs    z+MonotonicTimestampGenerator._next_timestampcCsF|j|jttd|jdWdS1swYdS)zw Makes ``MonotonicTimestampGenerator`` objects callable; defers internally to _next_timestamp. .A)rrN)rrinttimer)r r r r __call__Us $z$MonotonicTimestampGenerator.__call__cCs`|j|}||j}|jo||jdko||jdk}|r.tdj|||jd||_dSdS)NrzClock skew detected: current tick ({now}) was {diff} microseconds behind the last generated timestamp ({last}), returned timestamps will be artificially incremented to guarantee monotonicity.)rdiffr)rrrr r logwarningformat)r rrsince_last_warnwarnr r r r^s     z'MonotonicTimestampGenerator._maybe_warnN)Trr) __name__ __module__ __qualname____doc__rr r rrrrr r r r rs    r) rloggingr threadingr getLoggerrrobjectrr r r r s