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| # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved. | |
| # -*- coding: utf-8 -*- | |
| from time import perf_counter | |
| from typing import Optional | |
| class Timer: | |
| """ | |
| A timer which computes the time elapsed since the start/reset of the timer. | |
| """ | |
| def __init__(self) -> None: | |
| self.reset() | |
| def reset(self) -> None: | |
| """ | |
| Reset the timer. | |
| """ | |
| self._start = perf_counter() | |
| self._paused: Optional[float] = None | |
| self._total_paused = 0 | |
| self._count_start = 1 | |
| def pause(self) -> None: | |
| """ | |
| Pause the timer. | |
| """ | |
| if self._paused is not None: | |
| raise ValueError("Trying to pause a Timer that is already paused!") | |
| self._paused = perf_counter() | |
| def is_paused(self) -> bool: | |
| """ | |
| Returns: | |
| bool: whether the timer is currently paused | |
| """ | |
| return self._paused is not None | |
| def resume(self) -> None: | |
| """ | |
| Resume the timer. | |
| """ | |
| if self._paused is None: | |
| raise ValueError("Trying to resume a Timer that is not paused!") | |
| # pyre-fixme[58]: `-` is not supported for operand types `float` and | |
| # `Optional[float]`. | |
| self._total_paused += perf_counter() - self._paused | |
| self._paused = None | |
| self._count_start += 1 | |
| def seconds(self) -> float: | |
| """ | |
| Returns: | |
| (float): the total number of seconds since the start/reset of the | |
| timer, excluding the time when the timer is paused. | |
| """ | |
| if self._paused is not None: | |
| end_time: float = self._paused # type: ignore | |
| else: | |
| end_time = perf_counter() | |
| return end_time - self._start - self._total_paused | |
| def avg_seconds(self) -> float: | |
| """ | |
| Returns: | |
| (float): the average number of seconds between every start/reset and | |
| pause. | |
| """ | |
| return self.seconds() / self._count_start | |