GoVanguard/legion

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app/actions/AbstractObservable.py

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"""
LEGION (https://govanguard.com)
Copyright (c) 2020 GoVanguard

    This program 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.

    This program 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 this program.
    If not, see <http://www.gnu.org/licenses/>.

Author(s): Dmitriy Dubson (d.dubson@gmail.com)
"""
from abc import ABC
from typing import List

from app.actions.AbstractObserver import AbstractObserver


class AbstractObservable(ABC):
    _observers: List[AbstractObserver] = []

    def attach(self, observer):
        self._observers.append(observer)

    def detach(self, observer):
        self._observers.remove(observer)