55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
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#
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# Copyright (C) 2019 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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from abc import ABC
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from threading import Lock
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from pyanaconda.modules.common.errors.task import NoResultError
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__all__ = ['ResultProvider']
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class ResultProvider(ABC):
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"""Abstract class that allows to provide a result of a task."""
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def __init__(self):
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super().__init__()
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self.__result_lock = Lock()
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self.__result = None
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def _set_result(self, result):
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"""Set the result of the task.
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:param result: a result of the task
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"""
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with self.__result_lock:
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self.__result = result
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def get_result(self):
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"""Get the result of the task.
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It raises an exception if no result is provided.
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:return: a result of the task
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:raises: NoResultError if the result is None
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"""
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with self.__result_lock:
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if self.__result is None:
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raise NoResultError("The result is not provided.")
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return self.__result
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