NoJoy_DI/patterns.py
#!/usr/bin/python
# -*- coding: utf-8 -*-
# NoJoy_DI (c) 2016 by Andre Karlsson<andre.karlsson@protractus.se>
#
# This file is part of NoJoy_DI.
#
# NoJoy_DI is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# NoJoy_DI 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with NoJoy_DI. If not, see <http://www.gnu.org/licenses/>.
#
#
# Filename: trees by: andrek
# Timesamp: 2016-05-02 :: 11:47
"""Patterns for NoJoy_DI
.. moduleauthor:: André Karlsson <andre@sess.se>
"""
class BasePattern(object):
def get(self, c, name):
raise NotImplementedError()
class DefaultPattern(BasePattern):
def get(self, c, name):
return c()
class SingletonPattern(BasePattern):
"""
Lazy instantioation of the Singlton Pattern
"""
def __init__(self):
super(SingletonPattern, self).__init__()
self.instances = {}
def get(self, c, name):
if name not in self.instances:
self.instances[name] = c()
return self.instances[name]
class BorgPattern(BasePattern): #TODO Not working with set (parameters and service)
"""
Execution of the Borg (Monostate pattern)
"""
__instances = {}
def __init__(self):
super(BorgPattern, self).__init__()
def get(self, c, name):
"""
Get the instance based on the pattern to be used
:param c:
:param name:
:return:
"""
if name not in self.__instances:
self.__instances[name] = c()
return self.__instances[name]
theborg = c()
theborg.__dict__ = self.__instances[name].__dict__
return theborg