green_magic.data.receiver

Complexity

Total Complexity

6

Size/Duplication

Total Lines	35
Duplicated Lines	0 %

Importance

Changes

0

5 Methods

Rating	Name	Duplication	Size	Complexity
A	Backend.create()	0	5	2
A	Backend.features_factory()	0	4	1
A	Backend.register_as_subclass()	0	6	1
A	Backend.computing()	0	4	1
A	Backend.commands_manager()	0	4	1

import attr
import abc


class Backend(abc.ABC):
    subclasses = {}

    @classmethod
    def register_as_subclass(cls, backend_type):
        def wrapper(subclass):
            cls.subclasses[backend_type] = subclass
            return subclass
        return wrapper

    @classmethod
    def create(cls, backend_type, *args, **kwargs):
        if backend_type not in cls.subclasses:
            raise ValueError('Bad "Data Backend type" type \'{}\''.format(backend_type))
        return cls.subclasses[backend_type](*args, **kwargs)

    @property
    @abc.abstractmethod
    def features_factory(self):
        raise NotImplementedError

    @property
    @abc.abstractmethod
    def commands_manager(self):
        raise NotImplementedError

    @property
    @abc.abstractmethod
    def computing(self):
        raise NotImplementedError