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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2009-2012:
# Gabes Jean,
# Gerhard Lausser,
# Gregory Starck,
# Hartmut Goebel,
# This file is part of Shinken.
# Shinken is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# Shinken is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with Shinken. If not, see <>.
"""The AutoSlots Class is a MetaClass: it manages how other classes
are created (Classes, not instances of theses classes).
Here it's role is to create the __slots__ list of the class with
all properties of and Class.running_properties
so we do not have to add manually all properties to the __slots__
list when we add a new entry"""
class AutoSlots(type):
# new is call when we create a new Class
# that have metaclass = AutoSlots
# CLS is AutoSlots
# name is string of the Class (like Service)
# bases are the Classes of which Class inherits (like SchedulingItem)
# dct is the new Class dict (like all method of Service)
# Some properties names are not allowed in __slots__ like 2d_coords of
# Host, so we must tag them in properties with no_slots
def __new__(cls, name, bases, dct):
# Thanks to Bertrand Mathieu to the set idea
slots = dct.get('__slots__', set())
# Now get properties from properties and running_properties
if 'properties' in dct:
props = dct['properties']
slots.update((p for p in props
if not props[p].no_slots))
if 'running_properties' in dct:
props = dct['running_properties']
slots.update((p for p in props
if not props[p].no_slots))
dct['__slots__'] = tuple(slots)
return type.__new__(cls, name, bases, dct)
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