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# -*- coding: utf-8 -*- |
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# |
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# This file is part of Glances. |
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# |
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# Copyright (C) 2016 Nicolargo <[email protected]> |
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# |
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# Glances is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU Lesser General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# Glances is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU Lesser General Public License for more details. |
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# |
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# You should have received a copy of the GNU Lesser General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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"""Attribute class.""" |
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from datetime import datetime |
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class GlancesAttribute(object): |
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def __init__(self, name, description='', history_max_size=None): |
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"""Init the attribute |
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name: Attribute name (string) |
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description: Attribute human reading description (string) |
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history_max_size: Maximum size of the history list (default is no limit) |
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History is stored as a list for tuple: [(date, value), ...] |
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""" |
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self._name = name |
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self._description = description |
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self._value = None |
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self._history_max_size = history_max_size |
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self._history = [] |
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def __repr__(self): |
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return self.value |
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def __str__(self): |
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return str(self.value) |
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""" |
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Properties for the attribute name |
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""" |
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@property |
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def name(self): |
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return self._name |
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@name.setter |
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def name(self, new_name): |
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self._name = new_name |
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""" |
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Properties for the attribute description |
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""" |
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@property |
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def description(self): |
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return self._description |
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@description.setter |
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def description(self, new_description): |
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self._description = new_description |
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""" |
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Properties for the attribute value |
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""" |
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@property |
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def value(self): |
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if self.history_len() > 0: |
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return (self._value[1] - self.history_value()[1]) / (self._value[0] - self.history_value()[0]) |
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else: |
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return None |
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@value.setter |
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def value(self, new_value): |
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"""Set a value. |
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Value is a tuple: (<timestamp>, <new_value>) |
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""" |
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self._value = (datetime.now(), new_value) |
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self.history_add(self._value) |
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""" |
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Properties for the attribute history |
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""" |
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@property |
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def history(self): |
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return self._history |
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@history.setter |
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def history(self, new_history): |
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self._history = new_history |
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@history.deleter |
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def history(self): |
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del self._history |
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def history_reset(self): |
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self._history = [] |
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def history_add(self, value): |
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"""Add a value in the history |
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""" |
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if self._history_max_size is None or self.history_len() < self._history_max_size: |
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self._history.append(value) |
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else: |
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self._history = self._history[1:] + [value] |
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def history_size(self): |
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"""Return the history size (maximum nuber of value in the history) |
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""" |
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return len(self._history) |
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def history_len(self): |
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"""Return the current history lenght |
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""" |
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return len(self._history) |
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def history_value(self, pos=1): |
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"""Return the value in position pos in the history. |
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Default is to return the latest value added to the history. |
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""" |
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return self._history[-pos] |
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def history_json(self, nb=0): |
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"""Return the history of last nb items (0 for all) In ISO JSON format""" |
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return [(i[0].isoformat(), i[1]) for i in self._history[-nb:]] |
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def history_mean(self, nb=5): |
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"""Return the mean on the <nb> values in the history. |
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""" |
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d, v = zip(*self._history) |
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return sum(v[-nb:]) / float(v[-1] - v[-nb]) |
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nicolargo /
glances
