controls/DebugVariablePanel/RingBuffer.py
author Edouard Tisserant <edouard.tisserant@gmail.com>
Thu, 06 Oct 2022 10:02:46 +0200
branchwxPython4
changeset 3630 921f620577e8
parent 2742 5f7445b582d4
child 3750 f62625418bff
permissions -rw-r--r--
Merged changes from default
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of Beremiz
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# Copyright (C) 2021: Edouard TISSERANT
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#
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# See COPYING file for copyrights details.
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# Based on Eelco Hoogendoorn stackoverflow answer about RingBuffer with numpy
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import numpy as np
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class RingBuffer(object):
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    def __init__(self, width=None, size=131072, padding=None):
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        self.size = size
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        self.padding = size if padding is None else padding
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        shape = (self.size+self.padding,)
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        if width :
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            shape += (width,)
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        self.buffer = np.zeros(shape)
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        self.cursor = 0
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    def append(self, data):
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        """this is an O(n) operation"""
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        data = data[-self.size:]
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        n = len(data)
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        if self.size + self.padding - self.cursor < n:
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            self.compact()
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        self.buffer[self.cursor:][:n] = data
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        self.cursor += n
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    @property
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    def count(self):
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        return min(self.size, self.cursor)
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    @property
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    def view(self):
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        """this is always an O(1) operation"""
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        return self.buffer[max(0, self.cursor - self.size):][:self.count]
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    def compact(self):
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        """
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        note: only when this function is called, is an O(size) performance hit incurred,
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        and this cost is amortized over the whole padding space
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        """
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        print 'compacting'
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        self.buffer[:self.count] = self.view
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        self.cursor -= self.size
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