Commit 3264c6c9 authored by eric pellegrini's avatar eric pellegrini
Browse files

Fully docstringed MDANSE.Core.Singleton module

parent 103d6c46
'''
MDANSE : Molecular Dynamics Analysis for Neutron Scattering Experiments
------------------------------------------------------------------------------------------
Copyright (C)
2015- Eric C. Pellegrini Institut Laue-Langevin
BP 156
6, rue Jules Horowitz
38042 Grenoble Cedex 9
France
pellegrini[at]ill.fr
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
#MDANSE : Molecular Dynamics Analysis for Neutron Scattering Experiments
#------------------------------------------------------------------------------------------
#Copyright (C)
#2015- Eric C. Pellegrini Institut Laue-Langevin
#BP 156
#6, rue Jules Horowitz
#38042 Grenoble Cedex 9
#France
#pellegrini[at]ill.fr
#goret[at]ill.fr
#aoun[at]ill.fr
#
#This library is free software; you can redistribute it and/or
#modify it under the terms of the GNU Lesser General Public
#License as published by the Free Software Foundation; either
#version 2.1 of the License, or (at your option) any later version.
#
#This library is distributed in the hope that it will be useful,
#but WITHOUT ANY WARRANTY; without even the implied warranty of
#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
#Lesser General Public License for more details.
#
#You should have received a copy of the GNU Lesser General Public
#License along with this library; if not, write to the Free Software
#Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Created on Mar 23, 2015
'''
Created on Mar 30, 2015
@author: pellegrini
'''
class Singleton(type):
'''
Metaclass that implements the singleton pattern.
'''
__instances = {}
def __call__(self, *args, **kwargs):
'''
Creates (or returns if it has already been instanciated) an instance of the class.
'''
if self not in self.__instances:
self.__instances[self] = super(Singleton, self).__call__(*args, **kwargs)
......
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