编程思想设计模式行为模式Behavioralregistry

Posted 炼狱腾蛇

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了编程思想设计模式行为模式Behavioralregistry相关的知识,希望对你有一定的参考价值。

Python版

 

https://github.com/faif/python-patterns/blob/master/behavioral/registry.py

技术分享图片
#!/usr/bin/env python
# -*- coding: utf-8 -*-


class RegistryHolder(type):

    REGISTRY = {}

    def __new__(cls, name, bases, attrs):
        new_cls = type.__new__(cls, name, bases, attrs)
        """
            Here the name of the class is used as key but it could be any class
            parameter.
        """
        cls.REGISTRY[new_cls.__name__] = new_cls
        return new_cls

    @classmethod
    def get_registry(cls):
        return dict(cls.REGISTRY)


class BaseRegisteredClass(object):
    __metaclass__ = RegistryHolder
    """
        Any class that will inherits from BaseRegisteredClass will be included
        inside the dict RegistryHolder.REGISTRY, the key being the name of the
        class and the associated value, the class itself.
    """
    pass

if __name__ == "__main__":
    print("Before subclassing: ")
    for k in RegistryHolder.REGISTRY:
        print(k)

    class ClassRegistree(BaseRegisteredClass):

        def __init__(self, *args, **kwargs):
            pass

    print("After subclassing: ")
    for k in RegistryHolder.REGISTRY:
        print(k)

###  OUTPUT ###
# Before subclassing:
# BaseRegisteredClass
# After subclassing:
# BaseRegisteredClass
# ClassRegistree
Python转载版

 

以上是关于编程思想设计模式行为模式Behavioralregistry的主要内容,如果未能解决你的问题,请参考以下文章