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# -*- test-case-name: twisted.logger.test.test_buffer -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Log observer that maintains a buffer. """ from collections import deque from typing import Deque, Optional from zope.interface import implementer from ._interfaces import ILogObserver, LogEvent _DEFAULT_BUFFER_MAXIMUM = 64 * 1024 @implementer(ILogObserver) class LimitedHistoryLogObserver: """ L{ILogObserver} that stores events in a buffer of a fixed size:: >>> from twisted.logger import LimitedHistoryLogObserver >>> history = LimitedHistoryLogObserver(5) >>> for n in range(10): history({'n': n}) ... >>> repeats = [] >>> history.replayTo(repeats.append) >>> len(repeats) 5 >>> repeats [{'n': 5}, {'n': 6}, {'n': 7}, {'n': 8}, {'n': 9}] >>> """ def __init__(self, size: Optional[int] = _DEFAULT_BUFFER_MAXIMUM) -> None: """ @param size: The maximum number of events to buffer. If L{None}, the buffer is unbounded. """ self._buffer: Deque[LogEvent] = deque(maxlen=size) def __call__(self, event: LogEvent) -> None: self._buffer.append(event) def replayTo(self, otherObserver: ILogObserver) -> None: """ Re-play the buffered events to another log observer. @param otherObserver: An observer to replay events to. """ for event in self._buffer: otherObserver(event)
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